Alumina sleeve for shaft is a precision-made ceramic bushing that fits over a metal shaft to protect it from wear, corrosion and chemical attack. It is manufactured from high-purity alumina (Al₂O₃) and used in pumps, mixers, compressors and other rotating equipment where the shaft runs in a bearing, bushing or seal.
Alumina Sleeve for Shaft Benefits
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Engineered shaft protection in abrasive and corrosive duty
Alumina sleeve for shaft provides a hard, chemically inert barrier between the shaft and the process medium, preventing grooving, pitting and chemical attack on the base metal. This reduces shaft re-machining frequency and extends the overhaul cycle of pumps and rotating assemblies. -
Precision OD/ID control for stable mechanical alignment
The outer and inner diameters can be ground to narrow tolerances, enabling predictable fits with bearings, bushings, seal chambers and housings. Consistent dimensional control helps maintain coaxial alignment, lowering vibration levels and reducing the risk of seal face distortion or leakage. -
Low-friction polished surfaces for predictable sliding behavior
The alumina sleeve for shaft can be supplied with a polished bore or outside surface to reduce friction against the mating bearing or seal component. The smooth ceramic surface limits heat generation at the contact interface and contributes to stable running conditions under continuous duty. -
Material stability across a wide chemical and temperature range
Alumina retains hardness, compressive strength and dimensional stability in many acidic, alkaline and saline environments encountered in chemical, water treatment and slurry pumps. This stability makes the sleeve suitable for long-term service where metallic sleeves may soften, corrode or deform. -
Flexible integration for OEM design and retrofit upgrades
With custom dimensions, wall thickness and end detailing available, alumina sleeve for shaft can be incorporated into new pump platforms or used as a direct replacement for metal sleeves in existing installations. This flexibility allows engineers to upgrade wear performance without redesigning the entire assembly.
Alumina Sleeve for Shaft Properties
| Property | Unit | 99.5% Al₂O₃ | 99.6% Al₂O₃ | 99.7% Al₂O₃ | 99.8% Al₂O₃ | 99.9% Al₂O₃ | 99.99% Al₂O₃ |
| Alumina content | % | 99.5 | 99.6 | 99.7 | 99.8 | 99.9 | 99.99 |
| Density | g/cm³ | 3.89 | 3.91 | 3.92 | 3.93 | 3.94 | 3.98 |
| Open porosity | % | 0 | – | – | – | – | – |
| Color | – | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory |
| Water absorption | % | – | 0 | 0 | 0 | 0 | 0 |
| Young’s modulus (Elastic modulus) | GPa | 375 | 356 | 357 | 358 | 359 | 362 |
| Shear modulus | GPa | 152 | – | – | – | – | – |
| Bulk modulus | GPa | 228 | – | – | – | – | – |
| Poisson’s ratio | – | 0.22 | – | – | – | – | – |
| Compressive strength | MPa | 2600 | 2552 | 2554 | 2556 | 2558 | 2570 |
| Flexural strength | MPa | 379 | 312 | 313 | 314 | 315 | 320 |
| Fracture toughness | MPa·m¹ᐟ² | 4 | – | – | – | – | – |
| Hardness | GPa | 14.1 (≈1440 kg/mm²) | 23 | 24 | 25 | 26 | 30 |
| Thermal conductivity | W/m·K | 35 | 32–37 | 33–38 | 34–39 | 35–40 | 36–42 |
| Thermal shock resistance ΔT | °C | – | 222 | 223 | 224 | 225 | 228 |
| Maximum use temperature (no load) | °C | ≤1750 | 1755 | 1760 | 1765 | 1770 | 1800 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 8.4 | – | – | – | – | – |
| Specific heat | J/kg·K | 880 | – | – | – | – | – |
| Volume resistivity | Ω·cm | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric constant (relative permittivity) | – | 9.8 | 9.83 | 9.84 | 9.85 | 9.86 | 9.92 |
| Dielectric strength | kV/mm | 16.9 | 23.2 | 23.4 | 23.6 | 23.8 | 24 |
| Dissipation factor (loss factor @ 1 kHz) | – | 0.0002 | – | – | – | – | – |
Alumina Sleeve for Shaft Specifications
| Alumina Sleeve for Shaft | ||
| Item No. | Diameter (mm) | Thickness (mm) |
| AT-YHL-ZT001 | Customize | |
Alumina Ceramic Sleeve for Shaft Packaging
- Each alumina sleeve for the shaft is wrapped individually with soft cushioning material to prevent chipping during transport.
