Alumina Sand Mill Agitator Disc is a high-density alumina ceramic disc mounted on the shaft of a disc-type horizontal sand mill or bead mill to transfer energy from the motor to the grinding media and slurry. Its slots, holes and disc profile control the flow pattern and energy distribution inside the grinding chamber, so it directly affects grinding efficiency, particle size distribution and temperature rise.
Alumina Sand Mill Agitator Disc Benefits
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Disc geometry optimized for wet grinding
Flow channels and port patterns are tailored to bead mill hydraulics, supporting stable circulation and uniform energy distribution across the grinding chamber. -
High-density alumina body for extended wear life
The alumina ceramic disc combines high hardness with fine microstructure, providing long service life in abrasive pigment, filler and battery slurry systems. -
Low contamination compared with metal agitator discs
The alumina sand mill agitator disc minimizes metal pickup in sensitive formulations such as white coatings, high-purity pigments and lithium battery slurry. -
Tight dimensional tolerances for smooth operation
Critical dimensions such as bore, keyway and reference faces are machined to tight tolerances, supporting balanced rotation and low vibration at operating speed. -
Compatible with existing sand mill and bead mill platforms
The disc can be produced as a direct replacement for original agitator disc designs, so plant engineers can upgrade to alumina ceramic parts without changing the mill configuration.
Alumina Sand Mill Agitator Disc 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 Sand Mill Agitator Disc Specifications
| Alumina Ceramic Disc | ||||
| Item No. | Outer Diameter（mm） | Inner Diameter （mm） | Height （mm） | Purity |
| AT-SM-001 | 90 | 30 | 26 | 95%-99% |
| AT-SM-002 | 90 | 36 | 24 | 95%-99% |
| AT-SM-003 | 100 | 45 | 30 | 95%-99% |
| AT-SM-004 | 140 | 80 | 45 | 95%-99% |
| AT-SM-005 | 165 | 85 | 50 | 95%-99% |
Alumina Agitator Disc For Sand Mill Packaging
- Each alumina sand mill agitator disc is wrapped in soft protective material to protect the ceramic surfaces and machined hub from impact.
