{"id":12602,"date":"2026-03-24T06:35:05","date_gmt":"2026-03-24T06:35:05","guid":{"rendered":"https:\/\/hlh-js.com\/?p=12602"},"modified":"2026-03-24T06:35:05","modified_gmt":"2026-03-24T06:35:05","slug":"zirconia-beads-for-surface-polishing","status":"publish","type":"post","link":"https:\/\/hlh-js.com\/de\/resource\/blog\/zirconia-beads-for-surface-polishing\/","title":{"rendered":"Zirconia Beads for\u00a0Surface Polishing"},"content":{"rendered":"<!--\n  ============================================================\n  CLUSTER PAGE 3: Zirconia Beads for Surface Polishing\n  Jiangsu Henglihong Technology Co., Ltd.\n  Target URL: https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-surface-polishing\/\n  Word count: ~3200 words\n  Internal links:\n    \u2192 Pillar:    https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads\/\n    \u2192 Cluster 2: https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-deburring-and-edge-finishing\/\n    \u2192 Cluster 4: https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-coating-removal\/\n    \u2192 Cluster 6: https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-vs-glass-beads-vs-steel-shot\/\n  ============================================================\n\n  SEO META RECOMMENDATIONS:\n  -------------------------------------------------------\n  Title Tag:\n    Zirconia Beads for Surface Polishing \u2014 Achieving Mirror-Quality Finishes\n  Meta Description (\u2264160 chars):\n    Learn how YSZ zirconia beads burnish metal surfaces to Ra \u2264 0.2 \u00b5m. 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By Henglihong.\n  Focus Keyword: zirconia beads surface polishing\n  Secondary Keywords: YSZ beads polishing, ceramic bead burnishing, zirconia\n    polishing media, mirror finish zirconia, Ra 0.2 surface finish beads,\n    mass finishing polishing\n  Schema: Article + FAQPage\n  Canonical: https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-surface-polishing\/\n  OG Image: 1200\u00d7630 \u2014 reflective mirror-polished metal surface with YSZ beads\n  -------------------------------------------------------\n-->\n\n<style>\n  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n  :root {\n    --ink:        #0f1923;\n    --ink-light:  #3a4a5c;\n    --muted:      #6b7d8f;\n    --rule:       #dde3ea;\n    --bg:         #ffffff;\n    --surface:    #f5f7fa;\n    --accent:     #0057b8;\n    --accent-dk:  #003d85;\n    --accent-lt:  #e6f0ff;\n    --gold:       #c8902a;\n    --gold-lt:    #fdf4e3;\n    --green:      #1a7a4a;\n    --green-lt:   #eaf5ef;\n    --teal:       #0e6e72;\n    --teal-lt:    #e0f5f5;\n    --rose:       #9d174d;\n    --rose-lt:    #fdf2f8;\n    --radius-sm:  6px;\n    --radius-md:  12px;\n    --radius-lg:  20px;\n    --shadow-sm:  0 2px 8px rgba(0,0,0,.06);\n    --shadow-md:  0 6px 24px rgba(0,0,0,.09);\n    --font-body:  'Georgia','Times New Roman',serif;\n    --font-ui:    system-ui,-apple-system,'Segoe UI',sans-serif;\n    --max-w:      780px;\n    --max-w-wide: 1060px;\n  }\n\n  body { font-family: var(--font-body); 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font-size: 15px; font-weight: 700; padding: 13px 32px; border-radius: 50px; text-decoration: none; transition: transform .15s,box-shadow .15s; }\n  .hlh-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.25); text-decoration: none; }\n  .hlh-btn.white   { background: #fff; color: var(--teal); }\n  .hlh-btn.outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.5); margin-left: 12px; }\n\n  @media (max-width: 640px) {\n    .hlh-hero { padding: 40px 28px 36px; }\n    .hlh-cta  { padding: 36px 24px; }\n    .hlh-cta .hlh-btn.outline { margin-left: 0; margin-top: 10px; display: block; width: fit-content; margin: 10px auto 0; }\n    .hlh-pillar-banner { flex-direction: column; gap: 10px; }\n    .hlh-stages::before { left: 19px; }\n  }\n<\/style>\n\n<div class=\"hlh-article\">\n\n  <!-- \u2550\u2550\u2550 HERO \u2550\u2550\u2550 -->\n  <div class=\"hlh-hero\">\n    <div class=\"hlh-hero-tag\">Cluster Guide \u00b7 Surface Polishing<\/div>\n    <h1>Zirconia Beads for <em>Oberfl\u00e4che polieren<\/em>: Achieving Mirror-Quality Finishes on Precision Components<\/h1>\n    <p class=\"hlh-hero-sub\">A complete technical guide to using YSZ zirconia beads for burnishing and polishing \u2014 from the physics of surface asperity deformation to multi-stage process design, alloy compatibility, and Ra measurement standards.<\/p>\n    <div class=\"hlh-hero-meta\">\n      <div class=\"hlh-hero-meta-item\">&#128197; <strong>Updated 2026<\/strong><\/div>\n      <div class=\"hlh-hero-meta-item\">&#9200; <strong>~16 min read<\/strong><\/div>\n      <div class=\"hlh-hero-meta-item\">&#127981; <strong>Jiangsu Henglihong Technology Co, Ltd.<\/strong><\/div>\n    <\/div>\n  <\/div>\n\n  <!-- \u2550\u2550\u2550 TOC \u2550\u2550\u2550 -->\n  <div class=\"hlh-inner\">\n    <nav class=\"hlh-toc\" aria-label=\"Table of Contents\">\n      <div class=\"hlh-toc-title\">&#9776;&nbsp; Table of Contents<\/div>\n      <ol>\n        <li><a href=\"#what-is-bead-polishing\">What Is Bead Polishing and How Does It Work?<\/a><\/li>\n        <li><a href=\"#ra-explained\">Understanding Surface Roughness: Ra, Rz, and What They Mean<\/a><\/li>\n        <li><a href=\"#why-ysz-polishing\">Why YSZ Zirconia Beads Deliver Superior Polish Results<\/a><\/li>\n        <li><a href=\"#finish-grades\">Surface Finish Grades Achievable with YSZ Beads<\/a><\/li>\n        <li><a href=\"#multi-stage\">Multi-Stage Polishing Process Design<\/a><\/li>\n        <li><a href=\"#parameters\">Critical Process Parameters<\/a><\/li>\n        <li><a href=\"#alloy-compatibility\">Alloy Compatibility Guide<\/a><\/li>\n        <li><a href=\"#equipment\">Equipment Selection for Polishing<\/a><\/li>\n        <li><a href=\"#industry-applications\">Industrieanwendungen<\/a><\/li>\n        <li><a href=\"#faq\">H\u00e4ufig gestellte Fragen<\/a><\/li>\n      <\/ol>\n    <\/nav>\n\n    <!-- \u2550\u2550\u2550 SECTION 1 \u2550\u2550\u2550 -->\n    <h2 id=\"what-is-bead-polishing\">1. What Is Bead Polishing and How Does It Work?<\/h2>\n\n    <p>Bead polishing \u2014 more precisely called <strong>burnishing<\/strong> oder <strong>ball burnishing<\/strong> \u2014 is a surface finishing process in which a stream or charge of hard spherical media is directed against a workpiece surface at controlled energy levels. Unlike conventional abrasive polishing, which removes material by cutting, bead burnishing works by <em>plastically deforming surface asperities<\/em>: the peaks of the roughness profile are flattened and pushed into the valleys, reducing the peak-to-valley height (Ra) without significant bulk material removal.<\/p>\n\n    <p>The mechanism is fundamentally compressive. Each YSZ bead that contacts a surface peak generates a Hertzian contact pressure that exceeds the local yield strength of the workpiece material at that micro-contact. The peak deforms plastically, flows outward, and partially fills the adjacent valley. After many thousands of such contacts per square centimetre \u2014 which a mass finishing process delivers rapidly \u2014 the cumulative effect is a smoother, work-hardened surface with closed surface porosity, reduced Ra, and improved corrosion resistance.<\/p>\n\n    <div class=\"hlh-callout teal\">\n      <div class=\"hlh-callout-icon\">&#128300;<\/div>\n      <div class=\"hlh-callout-body\">\n        <strong>Burnishing vs Abrasive Polishing: The Key Distinction<\/strong>\n        In abrasive polishing (lapping, honing, grinding), material is removed by cutting action \u2014 the process reduces dimensions and generates swarf. In burnishing with YSZ beads, material is not removed but redistributed \u2014 peaks flow into valleys. This means burnishing can achieve very low Ra values without changing critical dimensions, making it compatible with tight-tolerance components that cannot afford material removal from functional surfaces.\n      <\/div>\n    <\/div>\n\n    <p>The process is self-limiting: as the surface becomes smoother, fewer high-energy asperity contacts occur per unit area, and the rate of Ra improvement slows. This means over-processing is far less catastrophic than in abrasive operations \u2014 Ra simply plateaus rather than continuing to degrade. In practice, the plateau Ra achievable depends primarily on bead size, material hardness, and contact energy.<\/p>\n\n    <!-- \u2550\u2550\u2550 SECTION 2 \u2550\u2550\u2550 -->\n    <h2 id=\"ra-explained\">2. Understanding Surface Roughness: Ra, Rz, and What They Mean<\/h2>\n\n    <p>Surface roughness is the primary quality metric for polishing processes. Understanding the measurement parameters is essential for specifying and verifying polishing outcomes.<\/p>\n\n    <p><strong>Ra (Arithmetic Mean Roughness)<\/strong> is the most widely used surface roughness parameter \u2014 the arithmetic average of absolute deviations from the mean surface line over the measurement length. Ra is not sensitive to isolated peaks or valleys, making it a stable, reproducible metric for process control. Most polishing specifications are expressed in Ra.<\/p>\n\n    <p><strong>Rz (Maximum Height of Profile)<\/strong> is the average of the five largest peak-to-valley heights in the measurement length. Rz is more sensitive to surface defects and is preferred for functional sealing surfaces, optical surfaces, and tribological applications where individual high peaks or deep valleys affect performance. For YSZ bead-polished surfaces, the Rz\/Ra ratio typically falls between 5 and 7 \u2014 more favourable than abrasive-polished surfaces, which may have Rz\/Ra ratios of 8\u201312 due to isolated deep scratches.<\/p>\n\n    <div class=\"hlh-ra-scale\">\n      <div class=\"hlh-ra-scale-title\">Surface Roughness Reference Scale \u2014 Typical Ra Values<\/div>\n      <div class=\"hlh-ra-bar\">\n        <div class=\"hlh-ra-seg\" style=\"background:#b0b0b0; flex: 3;\">Rough Machined<\/div>\n        <div class=\"hlh-ra-seg\" style=\"background:#6b8eb5; flex: 2;\">Ground<\/div>\n        <div class=\"hlh-ra-seg\" style=\"background:#2d7a6e; flex: 2;\">YSZ Deburred<\/div>\n        <div class=\"hlh-ra-seg\" style=\"background:#0e5a60; flex: 2;\">YSZ Polished<\/div>\n        <div class=\"hlh-ra-seg\" style=\"background:#083a40; flex: 1;\">Mirror<\/div>\n      <\/div>\n      <div class=\"hlh-ra-labels\">\n        <span>Ra 3.2 \u00b5m<\/span>\n        <span>Ra 1.6 \u00b5m<\/span>\n        <span>Ra 0.8 \u00b5m<\/span>\n        <span>Ra 0.4 \u00b5m<\/span>\n        <span>Ra 0.2 \u00b5m<\/span>\n        <span>Ra 0.05 \u00b5m<\/span>\n      <\/div>\n      <div class=\"hlh-ra-legend\">\n        <div class=\"hlh-ra-legend-item\"><div class=\"hlh-ra-dot\" style=\"background:#2d7a6e;\"><\/div>YSZ deburring range: Ra 0.4 \u2013 0.8 \u00b5m<\/div>\n        <div class=\"hlh-ra-legend-item\"><div class=\"hlh-ra-dot\" style=\"background:#0e5a60;\"><\/div>YSZ standard polishing: Ra 0.1 \u2013 0.4 \u00b5m<\/div>\n        <div class=\"hlh-ra-legend-item\"><div class=\"hlh-ra-dot\" style=\"background:#083a40;\"><\/div>YSZ mirror finish: Ra \u2264 0.1 \u00b5m<\/div>\n      <\/div>\n    <\/div>\n\n    <p>A critical point for process engineers: Ra alone does not fully describe a surface&#8217;s functional suitability. A surface with Ra 0.2 \u00b5m that was achieved by burnishing (rounded, regular peaks) behaves very differently in tribological contact from a surface with Ra 0.2 \u00b5m achieved by fine grinding (sharp, irregular peaks). YSZ-burnished surfaces typically exhibit a more favourable Abbott-Firestone (bearing ratio) curve \u2014 a higher material ratio at shallow depths \u2014 which means better contact support in bearing and sealing applications than the Ra value alone would suggest.<\/p>\n\n    <!-- \u2550\u2550\u2550 SECTION 3 \u2550\u2550\u2550 -->\n    <h2 id=\"why-ysz-polishing\">3. Why YSZ Zirconia Beads Deliver Superior Polish Results<\/h2>\n\n    <p>The polishing performance of a spherical bead medium depends on four properties operating together: hardness relative to the workpiece, density, sphericity, and surface smoothness of the bead itself. YSZ beads offer an optimal combination of all four.<\/p>\n\n    <div class=\"hlh-stats\">\n      <div class=\"hlh-stat\">\n        <div class=\"hlh-stat-num\">Ra 0.05<\/div>\n        <div class=\"hlh-stat-label\">\u00b5m achievable<br>With fine YSZ + burnish compound<\/div>\n      <\/div>\n      <div class=\"hlh-stat\">\n        <div class=\"hlh-stat-num\">&gt;98%<\/div>\n        <div class=\"hlh-stat-label\">Bead sphericity<br>Uniform contact geometry<\/div>\n      <\/div>\n      <div class=\"hlh-stat\">\n        <div class=\"hlh-stat-num\">0.3<\/div>\n        <div class=\"hlh-stat-label\">\u00b5m bead surface Ra<br>Smoother than polished steel<\/div>\n      <\/div>\n      <div class=\"hlh-stat\">\n        <div class=\"hlh-stat-num\">50%<\/div>\n        <div class=\"hlh-stat-label\">Ra improvement<br>Typical per polishing stage<\/div>\n      <\/div>\n    <\/div>\n\n    <h3>Hardness Differential \u2014 Controlled Deformation<\/h3>\n    <p>For burnishing to be effective, the bead must be significantly harder than the workpiece surface so that the bead deforms the workpiece, not the other way around. YSZ at 1100\u20131300 HV is harder than virtually all common engineering alloys \u2014 stainless steel (200\u2013400 HV), aluminium (60\u2013150 HV), titanium (300\u2013400 HV), even hardened tool steel (700\u2013900 HV). This ensures that contact energy is directed into workpiece deformation rather than bead wear, maintaining consistent polishing performance throughout the media charge&#8217;s service life.<\/p>\n\n    <h3>High Density \u2014 Consistent Contact Pressure<\/h3>\n    <p>At 6.0 g\/cm\u00b3, YSZ beads in a vibratory or centrifugal barrel process generate substantial self-weight contact pressure against workpiece surfaces \u2014 even at low relative velocities. This is important because polishing, unlike deburring, requires gentle, sustained contact energy rather than aggressive impact. The high density of YSZ ensures adequate contact force even when process velocity is deliberately kept low to protect delicate surface features.<\/p>\n\n    <h3>Own Surface Quality<\/h3>\n    <p>The surface finish of the bead itself sets the theoretical lower limit on the Ra achievable on the workpiece. YSZ beads from Henglihong have a bead surface roughness of approximately Ra 0.3 \u00b5m \u2014 significantly smoother than glass beads (Ra 0.5\u20130.8 \u00b5m) and far smoother than ceramic bead alternatives. This is why YSZ bead polishing can routinely achieve Ra values below 0.2 \u00b5m, while glass bead processes plateau around Ra 0.4\u20130.6 \u00b5m under comparable conditions.<\/p>\n\n    <h3>No Contamination of Polished Surface<\/h3>\n    <p>A polished surface that subsequently requires cleaning to remove iron contamination from steel shot residues has not been efficiently processed \u2014 the polishing gain is partly offset by the cleaning step. YSZ beads leave no metallic contamination on the workpiece surface, preserving the optical and functional quality of the polished surface immediately upon process completion.<\/p>\n\n    <!-- \u2550\u2550\u2550 SECTION 4 \u2550\u2550\u2550 -->\n    <h2 id=\"finish-grades\">4. Surface Finish Grades Achievable with YSZ Beads<\/h2>\n\n    <p>YSZ bead polishing spans a wide range of finish grades depending on bead size, process intensity, and number of stages. The four principal finish grades and their typical applications are:<\/p>\n\n    <div class=\"hlh-finish-grid\">\n      <div class=\"hlh-finish-card mirror\">\n        <span class=\"hlh-finish-icon\">&#129352;<\/span>\n        <div class=\"hlh-finish-name\">Mirror Finish<\/div>\n        <div class=\"hlh-finish-ra\">Ra \u2264 0.1 \u00b5m<\/div>\n        <div class=\"hlh-finish-desc\">Highly reflective, optically smooth. Achieved with fine YSZ beads (0.05\u20130.15 mm) and burnishing compound in multi-stage process. Watch cases, jewellery, medical implants, optical mounts.<\/div>\n      <\/div>\n      <div class=\"hlh-finish-card satin\">\n        <span class=\"hlh-finish-icon\">&#128161;<\/span>\n        <div class=\"hlh-finish-name\">Bright Satin<\/div>\n        <div class=\"hlh-finish-ra\">Ra 0.1 \u2013 0.25 \u00b5m<\/div>\n        <div class=\"hlh-finish-desc\">Semi-reflective with fine, uniform texture. Standard for decorative aerospace and automotive components. Achievable in single stage with 0.1\u20130.3 mm YSZ beads.<\/div>\n      <\/div>\n      <div class=\"hlh-finish-card matte\">\n        <span class=\"hlh-finish-icon\">&#9728;<\/span>\n        <div class=\"hlh-finish-name\">Smooth Matte<\/div>\n        <div class=\"hlh-finish-ra\">Ra 0.25 \u2013 0.6 \u00b5m<\/div>\n        <div class=\"hlh-finish-desc\">Uniform low-gloss surface. Improved corrosion resistance versus machined surface. Typical for functional industrial components, hydraulic cylinders, structural parts.<\/div>\n      <\/div>\n      <div class=\"hlh-finish-card textured\">\n        <span class=\"hlh-finish-icon\">&#9783;<\/span>\n        <div class=\"hlh-finish-name\">Controlled Texture<\/div>\n        <div class=\"hlh-finish-ra\">Ra 0.6 \u2013 1.6 \u00b5m<\/div>\n        <div class=\"hlh-finish-desc\">Consistent dimple pattern from larger YSZ beads. Used for adhesion profiling before coating, oil retention surfaces in engine components, anti-slip functional surfaces.<\/div>\n      <\/div>\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 SECTION 5 \u2550\u2550\u2550 -->\n    <h2 id=\"multi-stage\">5. Multi-Stage Polishing Process Design<\/h2>\n\n    <p>Achieving Ra \u2264 0.2 \u00b5m on a component starting from a machined surface (typically Ra 0.8\u20133.2 \u00b5m) in a single process stage is rarely optimal. A well-designed multi-stage process achieves the target finish more reliably, in shorter total cycle time, and with lower media wear than attempting to accomplish everything in one stage. The three-stage approach below is the standard Henglihong recommendation for precision polishing applications.<\/p>\n\n    <div class=\"hlh-stages\">\n\n      <div class=\"hlh-stage\">\n        <div class=\"hlh-stage-dot s1\">1<\/div>\n        <div class=\"hlh-stage-body\">\n          <div class=\"hlh-stage-title\">Stage 1 \u2014 Deburring &amp; Macro-Smoothing<\/div>\n          <div class=\"hlh-stage-desc\">Remove any residual burrs, machining marks, and surface contamination. Reduce Ra from the machined condition to approximately Ra 0.6\u20130.8 \u00b5m. This stage can use the same process parameters as a standalone <a href=\"https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-deburring-and-edge-finishing\/\" target=\"_blank\" rel=\"noopener\">deburring operation<\/a> \u2014 larger YSZ beads at moderate energy with an alkaline cutting compound.<\/div>\n          <div class=\"hlh-stage-spec\">\n            YSZ bead size: 0.5 \u2013 1.5 mm &nbsp;|&nbsp; Compound: Alkaline cutting (pH 8\u20139) &nbsp;|&nbsp; Cycle: 30\u201360 min (vibratory) \/ 10\u201320 min (centrifugal) &nbsp;|&nbsp; Target Ra: 0.6 \u2013 0.8 \u00b5m\n          <\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"hlh-stage\">\n        <div class=\"hlh-stage-dot s2\">2<\/div>\n        <div class=\"hlh-stage-body\">\n          <div class=\"hlh-stage-title\">Stage 2 \u2014 Intermediate Polishing<\/div>\n          <div class=\"hlh-stage-desc\">Transition to smaller YSZ beads and a lower-cut compound to reduce Ra to 0.2\u20130.4 \u00b5m. The smaller bead size increases the number of contact points per unit area, smoothing the texture left by Stage 1. This stage is often the most time-consuming and requires careful cycle time control to avoid over-polishing corners and complex features.<\/div>\n          <div class=\"hlh-stage-spec\">\n            YSZ bead size: 0.2 \u2013 0.5 mm &nbsp;|&nbsp; Compound: Neutral burnishing (pH 7\u20137.5) &nbsp;|&nbsp; Cycle: 45\u201390 min (vibratory) \/ 15\u201330 min (centrifugal) &nbsp;|&nbsp; Target Ra: 0.2 \u2013 0.4 \u00b5m\n          <\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"hlh-stage\">\n        <div class=\"hlh-stage-dot s3\">3<\/div>\n        <div class=\"hlh-stage-body\">\n          <div class=\"hlh-stage-title\">Stage 3 \u2014 Mirror \/ Bright Finishing<\/div>\n          <div class=\"hlh-stage-desc\">Final polishing stage using the finest YSZ beads available (0.05\u20130.15 mm) with a dedicated bright-finish burnishing compound. This stage burnishes the surface to its final Ra, closes residual microporosity, and imparts the characteristic bright luster of YSZ-polished components. Rinse immediately after this stage to preserve surface quality.<\/div>\n          <div class=\"hlh-stage-spec\">\n            YSZ bead size: 0.05 \u2013 0.15 mm &nbsp;|&nbsp; Compound: Bright burnishing (pH 7\u20138) &nbsp;|&nbsp; Cycle: 30\u201360 min (vibratory) \/ 10\u201320 min (centrifugal) &nbsp;|&nbsp; Target Ra: \u2264 0.1 \u00b5m\n          <\/div>\n        <\/div>\n      <\/div>\n\n    <\/div>\n\n    <div class=\"hlh-callout gold\">\n      <div class=\"hlh-callout-icon\">&#128203;<\/div>\n      <div class=\"hlh-callout-body\">\n        <strong>When a Two-Stage Process Is Sufficient<\/strong>\n        For components starting from a ground or fine-machined surface (Ra \u2264 0.8 \u00b5m) where the target is Ra 0.2\u20130.4 \u00b5m rather than mirror finish, a two-stage process is often sufficient and more cost-effective: Stage 1 with 0.3\u20130.6 mm YSZ at moderate energy, followed by Stage 2 with 0.1\u20130.2 mm YSZ with burnishing compound. This approach is common for aerospace fastener finishing, medical bone screw polishing, and precision hydraulic spool surfaces.\n      <\/div>\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 SECTION 6 \u2550\u2550\u2550 -->\n    <h2 id=\"parameters\">6. Critical Process Parameters<\/h2>\n\n    <p>Polishing with YSZ beads is more sensitive to parameter control than deburring, because the target Ra values are lower and the process margins are tighter. The following parameters require careful setting and monitoring.<\/p>\n\n    <div class=\"hlh-table-wrap\">\n      <table class=\"hlh-table\" aria-label=\"YSZ Polishing Process Parameters\">\n        <thead>\n          <tr>\n            <th>Parameter<\/th>\n            <th>Empfohlener Bereich<\/th>\n            <th>Effect of Over-Setting<\/th>\n            <th>Effect of Under-Setting<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td><strong>Bead size<\/strong><\/td>\n            <td>0.05 \u2013 0.5 mm (polishing stages)<\/td>\n            <td>Slower Ra improvement; coarser final texture<\/td>\n            <td>Insufficient energy for macro-smoothing in early stages<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Process energy \/ speed<\/strong><\/td>\n            <td>Lower than deburring (30\u201370% of max)<\/td>\n            <td>Dimensional change; edge over-radius; heat generation<\/td>\n            <td>Slow polishing rate; insufficient contact pressure for burnishing<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Cycle time per stage<\/strong><\/td>\n            <td>Stage-dependent (see multi-stage guide above)<\/td>\n            <td>Plateau \u2014 Ra stops improving; minor edge over-radius<\/td>\n            <td>Incomplete smoothing before next stage; final Ra target not reached<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Compound concentration<\/strong><\/td>\n            <td>1 \u2013 3% by volume (manufacturer guidance)<\/td>\n            <td>Over-lubrication reduces contact pressure; slower polishing<\/td>\n            <td>Insufficient lubrication; media and workpiece heating; staining<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Water flow rate<\/strong><\/td>\n            <td>Continuous flood (vibratory); pre-wetted (barrel)<\/td>\n            <td>Compound wash-out; inconsistent cut rate<\/td>\n            <td>Media clumping; inadequate swarf removal; surface re-deposition<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Media-to-part ratio<\/strong><\/td>\n            <td>6:1 \u2013 10:1 by volume (higher than deburring)<\/td>\n            <td>Diminishing returns; excessive cycle cost<\/td>\n            <td>Part-to-part contact; uneven surface coverage<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <div class=\"hlh-callout rose\">\n      <div class=\"hlh-callout-icon\">&#9888;<\/div>\n      <div class=\"hlh-callout-body\">\n        <strong>Temperature Control in Extended Polishing Cycles<\/strong>\n        In centrifugal barrel polishing at high G-forces, the media-workpiece charge can generate significant heat through friction over extended cycles. Temperatures above 60\u00b0C can discolour aluminium alloys, alter the surface chemistry of stainless steel, and degrade polishing compound effectiveness. Monitor charge temperature during trials and add cooling water flow if temperatures rise above 45\u00b0C. For titanium alloys, maintain charge temperature below 50\u00b0C to prevent surface oxidation tinting.\n      <\/div>\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 SECTION 7 \u2550\u2550\u2550 -->\n    <h2 id=\"alloy-compatibility\">7. Alloy Compatibility Guide<\/h2>\n\n    <p>YSZ beads are chemically inert and mechanically compatible with all common engineering alloys. The key variable across materials is the optimal bead size and process energy \u2014 harder alloys require finer beads and longer cycle times to reach the same Ra as softer alloys. The guide below provides validated starting parameters for the most common workpiece materials.<\/p>\n\n    <div class=\"hlh-alloy-grid\">\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Stainless Steel (300 \/ 400 series)<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.05 \u2013 0.3 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">Excellent YSZ compatibility. Alkaline compound recommended. Two to three stages for mirror finish. No contamination risk.<\/div>\n      <\/div>\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Titanium Alloys (Ti-6Al-4V, cp-Ti)<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.08 \u2013 0.4 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">YSZ is the preferred media \u2014 no iron contamination. Harder than steel; requires finer beads and longer cycles. Keep temperature below 50\u00b0C.<\/div>\n      <\/div>\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Aluminium Alloys (2xxx, 6xxx, 7xxx)<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.05 \u2013 0.2 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">Soft material \u2014 polishes rapidly. Use low-energy settings to avoid over-radius on edges. pH-neutral compound to prevent etching.<\/div>\n      <\/div>\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Nickel Superalloys (Inconel, Waspaloy)<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.1 \u2013 0.5 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">High work-hardening rate; requires higher-energy centrifugal process. YSZ mandatory \u2014 iron contamination disqualifying for aerospace use.<\/div>\n      <\/div>\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Hardened Tool Steel (60+ HRC)<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.1 \u2013 0.4 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">Very slow polishing rate due to high hardness. Fine YSZ beads (0.05\u20130.15 mm) required. Extended cycle times; centrifugal barrel preferred over vibratory.<\/div>\n      <\/div>\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Copper \/ Brass \/ Bronze<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.03 \u2013 0.15 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">Excellent polishability \u2014 softest common engineering metals. Mirror finish achievable in two stages. Use copper-compatible compound; avoid chloride-containing products.<\/div>\n      <\/div>\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Cobalt-Chrome Alloys (CoCr)<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.05 \u2013 0.3 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">Primary application in medical implants and dental prosthetics. YSZ polishing achieves ISO 10993-compatible surface quality. No iron contamination.<\/div>\n      <\/div>\n      <div class=\"hlh-alloy-card\">\n        <div class=\"hlh-alloy-name\">Magnesium Alloys<\/div>\n        <div class=\"hlh-alloy-ra\">Achievable Ra: 0.05 \u2013 0.2 \u00b5m<\/div>\n        <div class=\"hlh-alloy-note\">Very soft and reactive. Use magnesium-specific pH-neutral compound; rinse immediately after process; dry thoroughly to prevent water staining. Low-energy settings essential.<\/div>\n      <\/div>\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 SECTION 8 \u2550\u2550\u2550 -->\n    <h2 id=\"equipment\">8. Equipment Selection for Polishing<\/h2>\n\n    <p>The choice of finishing equipment significantly affects the achievable Ra, cycle time, and component geometry that can be successfully polished. Each platform has advantages and limitations that should be matched to the specific application.<\/p>\n\n    <div class=\"hlh-table-wrap\">\n      <table class=\"hlh-table\" aria-label=\"Equipment Comparison for YSZ Polishing\">\n        <thead>\n          <tr>\n            <th>Equipment Type<\/th>\n            <th>Process Energy<\/th>\n            <th>Min Ra Achievable<\/th>\n            <th>Geometry Suitability<\/th>\n            <th>Best Use Case<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td><strong>Vibratory Bowl \/ Trough<\/strong><\/td>\n            <td><span class=\"hlh-badge avg\">Low\u2013Medium<\/span><\/td>\n            <td>Ra 0.1 \u00b5m<\/td>\n            <td>Complex geometries, delicate parts<\/td>\n            <td>Jewellery, watch cases, medical implants, mixed-batch production<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Centrifugal Barrel (CBF)<\/strong><\/td>\n            <td><span class=\"hlh-badge best\">High (5\u201325G)<\/span><\/td>\n            <td>Ra 0.05 \u00b5m<\/td>\n            <td>Moderate \u2014 avoids very fragile parts<\/td>\n            <td>Aerospace fasteners, gears, bone screws \u2014 fastest cycle time<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Centrifugal Disc (CDF)<\/strong><\/td>\n            <td><span class=\"hlh-badge good\">Medium\u2013High<\/span><\/td>\n            <td>Ra 0.08 \u00b5m<\/td>\n            <td>Flat and near-flat surfaces; open geometry<\/td>\n            <td>Stamped parts, sheet metal components, disc-shaped parts<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Drag Finishing<\/strong><\/td>\n            <td><span class=\"hlh-badge best\">Very High<\/span><\/td>\n            <td>Ra 0.03 \u00b5m<\/td>\n            <td>Individual fixturing \u2014 ideal for delicate complex parts<\/td>\n            <td>Turbine blades, dental abutments, precision optics mounts<\/td>\n          <\/tr>\n          <tr>\n            <td><strong>Wet Tumble Barrel<\/strong><\/td>\n            <td><span class=\"hlh-badge avg\">Low\u2013Medium<\/span><\/td>\n            <td>Ra 0.2 \u00b5m<\/td>\n            <td>Simple geometries; batch processing<\/td>\n            <td>General engineering components, castings \u2014 low capital cost<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <p>For the highest-precision polishing applications \u2014 turbine blade airfoil finishing, dental implant mirror polishing, watch component finishing \u2014 <strong>drag finishing<\/strong> is the gold standard. In drag finishing, individual components are fixtured on a rotating arm that drags them through a stationary bed of YSZ beads. The controlled, programmable contact geometry and high relative velocity allow Ra values below 0.05 \u00b5m to be achieved reproducibly on complex three-dimensional surfaces that cannot be processed in batch equipment.<\/p>\n\n    <!-- \u2550\u2550\u2550 SECTION 9 \u2550\u2550\u2550 -->\n    <h2 id=\"industry-applications\">9. Industry Applications<\/h2>\n\n    <h3>Watchmaking &amp; Luxury Goods<\/h3>\n    <p>Watch case and bracelet finishing is one of the most demanding polishing applications \u2014 consumers expect reflective, defect-free mirror surfaces that retain their appearance through years of wear. YSZ bead polishing in vibratory and drag finishing equipment achieves the Ra \u2264 0.08 \u00b5m required for luxury watch surfaces on stainless steel, titanium, and ceramic case materials, with no contamination and consistent batch-to-batch quality. Eyewear frames, luxury pen hardware, and high-end jewellery components are polished using the same process.<\/p>\n\n    <h3>Medizinische Ger\u00e4te und Implantate<\/h3>\n    <p>ISO 10993 and ASTM F86 require that metallic implant surfaces meet defined corrosion resistance and biocompatibility standards, which are strongly influenced by surface finish. Orthopaedic implants polished to Ra \u2264 0.1 \u00b5m show improved corrosion resistance, reduced bacterial adhesion, and better wear performance in articulating surfaces. YSZ bead polishing achieves these Ra values on CoCr, titanium, and stainless steel implant materials without introducing any biocompatibility-relevant contaminants.<\/p>\n\n    <h3>Aerospace Components<\/h3>\n    <p>Aerodynamically critical surfaces \u2014 compressor blade airfoils, fan blade leading edges, turbine vane platforms \u2014 require low Ra to minimise boundary layer transition from laminar to turbulent flow, directly affecting engine efficiency. Polishing these surfaces with fine YSZ beads after <a href=\"https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-coating-removal\/\" target=\"_blank\" rel=\"noopener\">coating removal or repair<\/a> restores aerodynamic surface quality and allows the component to re-enter service meeting original equipment manufacturer (OEM) surface finish specifications.<\/p>\n\n    <h3>Automotive \u2014 Decorative &amp; Functional<\/h3>\n    <p>Visible automotive components \u2014 alloy wheel faces, door handle inserts, trim pieces \u2014 require polished surfaces that retain appearance in harsh outdoor environments. YSZ bead polishing produces consistent bright-satin finishes on aluminium and stainless steel without the dimensional risks of mechanical buffing. For functional components, engine connecting rod bores polished to Ra \u2264 0.2 \u00b5m show improved oil film retention and reduced bearing wear.<\/p>\n\n    <!-- \u2550\u2550\u2550 PILLAR BACKLINK \u2550\u2550\u2550 -->\n    <div class=\"hlh-pillar-banner\">\n      <div class=\"hlh-pillar-banner-icon\">&#128279;<\/div>\n      <div class=\"hlh-pillar-banner-text\">\n        This article is part of Henglihong&#8217;s complete surface treatment knowledge base. For a full overview of YSZ zirconia bead properties, product range, and all application categories \u2014 including shot peening, deburring, coating removal, and industrial cleaning \u2014 refer to our <a href=\"https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads\/\" target=\"_blank\" rel=\"noopener\">complete zirconia beads guide<\/a>.\n      <\/div>\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 RELATED GUIDES \u2550\u2550\u2550 -->\n    <h3>Related Guides in This Series<\/h3>\n    <div class=\"hlh-related\">\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-deburring-and-edge-finishing\/\" target=\"_blank\" rel=\"noopener\" class=\"hlh-related-card\">\n        <div class=\"hlh-related-card-icon\">&#128295;<\/div>\n        <div>\n          <strong>Deburring &amp; Edge Finishing<\/strong>\n          <span>Vibratory, centrifugal &amp; pneumatic burr removal<\/span>\n        <\/div>\n      <\/a>\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-for-coating-removal\/\" target=\"_blank\" rel=\"noopener\" class=\"hlh-related-card\">\n        <div class=\"hlh-related-card-icon\">&#128737;<\/div>\n        <div>\n          <strong>Coating Removal Guide<\/strong>\n          <span>TBC stripping, chrome removal, substrate protection<\/span>\n        <\/div>\n      <\/a>\n      <a href=\"https:\/\/hlh-js.com\/resource\/blog\/zirconia-beads-vs-glass-beads-vs-steel-shot\/\" target=\"_blank\" rel=\"noopener\" class=\"hlh-related-card\">\n        <div class=\"hlh-related-card-icon\">&#9878;<\/div>\n        <div>\n          <strong>Media Comparison Guide<\/strong>\n          <span>Zirconia vs glass vs steel \u2014 polishing performance &amp; TCO<\/span>\n        <\/div>\n      <\/a>\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 FAQ \u2550\u2550\u2550 -->\n    <h2 id=\"faq\">10. Frequently Asked Questions<\/h2>\n\n    <div class=\"hlh-faq\">\n\n      <div class=\"hlh-faq-item\">\n        <div class=\"hlh-faq-q\" onclick=\"this.parentElement.classList.toggle('open')\">\n          What is the finest Ra achievable with YSZ bead polishing?\n          <span class=\"hlh-faq-toggle\">+<\/span>\n        <\/div>\n        <div class=\"hlh-faq-a\">\n          With the finest available YSZ beads (0.05\u20130.1 mm diameter) in a drag finishing or high-speed centrifugal barrel process with a dedicated bright burnishing compound, Ra values as low as 0.03\u20130.05 \u00b5m are achievable on soft-to-medium hardness alloys such as stainless steel, aluminium, copper, and cobalt-chrome. On harder materials (titanium, nickel superalloys, hardened steel), the practical limit is Ra 0.08\u20130.15 \u00b5m in a multi-stage process. These values are comparable to \u2014 and in many cases surpass \u2014 those achievable with fine grinding or lapping, without the dimensional loss those processes entail.\n        <\/div>\n      <\/div>\n\n      <div class=\"hlh-faq-item\">\n        <div class=\"hlh-faq-q\" onclick=\"this.parentElement.classList.toggle('open')\">\n          Does bead polishing change the dimensions of tight-tolerance components?\n          <span class=\"hlh-faq-toggle\">+<\/span>\n        <\/div>\n        <div class=\"hlh-faq-a\">\n          Dimensional change from YSZ bead burnishing is typically less than 1\u20133 \u00b5m per polishing stage on flat and cylindrical surfaces \u2014 well within the tolerance band of most precision engineering components. However, sharp edges and corners experience more material redistribution than flat surfaces, and their radii will increase progressively with cycle time. For components with sharp-edge functional requirements (cutting tool edges, seal grooves), cycle time must be controlled carefully, and edge radius change should be measured on first-article trials before production commitment.\n        <\/div>\n      <\/div>\n\n      <div class=\"hlh-faq-item\">\n        <div class=\"hlh-faq-q\" onclick=\"this.parentElement.classList.toggle('open')\">\n          Can YSZ bead polishing be combined with shot peening in the same process?\n          <span class=\"hlh-faq-toggle\">+<\/span>\n        <\/div>\n        <div class=\"hlh-faq-a\">\n          They use the same media type but are distinct, separately qualified processes. Shot peening requires precise Almen intensity control and uses a calibrated media charge. Polishing uses finer beads, lower energy, and a burnishing compound \u2014 conditions incompatible with Almen certification. In practice, for components requiring both fatigue life enhancement and surface finish improvement (e.g., compressor blades), shot peening is performed first to establish the compressive stress layer, followed by a polishing stage with finer beads to reduce Ra without significantly altering the stress profile. The two processes use separate equipment and separate media charges.\n        <\/div>\n      <\/div>\n\n      <div class=\"hlh-faq-item\">\n        <div class=\"hlh-faq-q\" onclick=\"this.parentElement.classList.toggle('open')\">\n          How do I measure Ra on a complex 3D surface after bead polishing?\n          <span class=\"hlh-faq-toggle\">+<\/span>\n        <\/div>\n        <div class=\"hlh-faq-a\">\n          For accessible flat or cylindrical surfaces, a contact stylus profilometer (per ISO 4287) is the standard method \u2014 fast, low-cost, and well-understood. For complex 3D surfaces (airfoil profiles, implant contours, internal passages), optical methods are preferred: white-light interferometry for high-resolution areal measurement (Sa, Sz) or confocal microscopy for very fine Ra values. For production inspection of polished components, coordinate measuring machine (CMM) surface finish attachments allow Ra measurement at defined locations on complex geometries without separate fixturing. Always measure at the same location and orientation relative to the lay direction to ensure inter-batch comparability.\n        <\/div>\n      <\/div>\n\n      <div class=\"hlh-faq-item\">\n        <div class=\"hlh-faq-q\" onclick=\"this.parentElement.classList.toggle('open')\">\n          Why does my polished surface show a different colour in some areas after YSZ polishing?\n          <span class=\"hlh-faq-toggle\">+<\/span>\n        <\/div>\n        <div class=\"hlh-faq-a\">\n          Colour variation after polishing usually indicates one of three causes: (1) differential work-hardening on surfaces with varying grain orientation \u2014 particularly visible on austenitic stainless steel and titanium, where individual grains polish at slightly different rates; (2) surface oxidation from insufficient rinsing or slow drying after the process, especially on titanium and aluminium; or (3) residual compound that has dried onto the surface. Remedy: immediate, thorough rinsing with deionised water after the final polishing stage, followed by rapid drying with filtered air or a spin-dryer. For titanium components, ensure charge temperature stayed below 50\u00b0C throughout the process.\n        <\/div>\n      <\/div>\n\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 AUTHOR \u2550\u2550\u2550 -->\n    <div class=\"hlh-author\">\n      <div class=\"hlh-author-logo\">HLH<\/div>\n      <div>\n        <div class=\"hlh-author-name\">Jiangsu Henglihong Technology Co, Ltd.<\/div>\n        <div class=\"hlh-author-bio\">YSZ zirconia bead specialist for precision surface polishing and mirror-finish burnishing. Supporting watchmaking, medical device, aerospace, and automotive manufacturers with ultra-fine bead sizes, multi-stage process guidance, and comprehensive application engineering.<\/div>\n      <\/div>\n    <\/div>\n\n    <!-- \u2550\u2550\u2550 CTA \u2550\u2550\u2550 -->\n    <div class=\"hlh-cta\">\n      <h2>Achieve the Surface Finish Your Application Demands<\/h2>\n      <p>Tell us your workpiece material, starting Ra, and target finish \u2014 our engineers will recommend the optimal YSZ bead size and multi-stage process to get you there.<\/p>\n      <a href=\"https:\/\/hlh-js.com\/contact\/\" class=\"hlh-btn white\" target=\"_blank\" rel=\"noopener\">Request Process Consultation<\/a>\n      <a href=\"https:\/\/hlh-js.com\/products\/\" class=\"hlh-btn outline\" target=\"_blank\" rel=\"noopener\">View YSZ Product Range<\/a>\n    <\/div>\n\n  <\/div><!-- end hlh-inner -->\n<\/div><!-- end hlh-article -->\n\n<!-- \u2550\u2550\u2550 SCHEMA MARKUP \u2550\u2550\u2550 -->\n<script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@graph\": [\n        {\n            \"@type\": \"Article\",\n            \"headline\": \"Zirconia Beads for Surface Polishing \\u2014 Achieving Mirror-Quality Finishes on Precision Components\",\n            \"description\": \"Complete guide to YSZ zirconia bead burnishing and polishing. Covers Ra physics, multi-stage process design, alloy compatibility, equipment selection, and industry applications for mirror finishes to Ra \\u2264 0.05 \\u00b5m.\",\n            \"author\": {\n                \"@type\": \"Organization\",\n                \"name\": \"Jiangsu Henglihong Technology Co., Ltd.\",\n                \"url\": \"https:\\\/\\\/hlh-js.com\"\n            },\n            \"publisher\": {\n                \"@type\": \"Organization\",\n                \"name\": \"Jiangsu Henglihong Technology Co., Ltd.\",\n                \"url\": \"https:\\\/\\\/hlh-js.com\"\n            },\n            \"mainEntityOfPage\": {\n                \"@type\": \"WebPage\",\n                \"@id\": \"https:\\\/\\\/hlh-js.com\\\/resource\\\/blog\\\/zirconia-beads-for-surface-polishing\\\/\"\n            },\n            \"keywords\": \"zirconia beads surface polishing, YSZ beads polishing, ceramic bead burnishing, zirconia polishing media, mirror finish zirconia, Ra 0.2 surface finish, mass finishing polishing, ball burnishing\"\n        },\n        {\n            \"@type\": \"FAQPage\",\n            \"mainEntity\": [\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"What is the finest Ra achievable with YSZ bead polishing?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"With finest YSZ beads (0.05\\u20130.1 mm) in drag finishing or high-speed centrifugal barrel with burnishing compound, Ra values as low as 0.03\\u20130.05 \\u00b5m are achievable on stainless steel, aluminium, copper, and cobalt-chrome. On harder materials, the practical limit is Ra 0.08\\u20130.15 \\u00b5m in a multi-stage process.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Does bead polishing change the dimensions of tight-tolerance components?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"Dimensional change from YSZ bead burnishing is typically less than 1\\u20133 \\u00b5m per polishing stage on flat and cylindrical surfaces \\u2014 well within the tolerance band of most precision engineering components. Sharp edges experience more material redistribution and cycle time must be controlled.\"\n                    }\n                },\n                {\n                    \"@type\": \"Question\",\n                    \"name\": \"Can YSZ bead polishing be combined with shot peening?\",\n                    \"acceptedAnswer\": {\n                        \"@type\": \"Answer\",\n                        \"text\": \"They are distinct, separately qualified processes. Shot peening uses a calibrated media charge for Almen intensity control. Polishing uses finer beads, lower energy, and burnishing compound. 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