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7–8 mm pressureless sintered silicon carbide (SiC) grinding balls are ceramic grinding media manufactured from nano-scale SiC powder via high-temperature sintering at atmospheric pressure. With their relatively low density and extremely high hardness, they are ideal grinding media for stirred mills.
Manufacturing Process
Process Step
Key Points
Description
Raw material preparation
Ultra-fine high-purity SiC powder
Synthetic SiC is ground into an ultra-fine, high-purity powder
Mixing and batching
Addition of sintering aids
Sintering aids reduce the temperature required for densification, enabling pressureless sintering
Ball blank forming
Rolling forming
Rough ball blanks of the required dimensions are produced
Sintering
High-temperature pressureless sintering
Sintering is carried out at 1950–2150 °C in a non‑oxidizing atmosphere under normal pressure
Cooling and finishing
Natural cooling
After natural cooling, finishing is performed if necessary to obtain the finished grinding balls
Core Properties
Property
Value
Remarks
Density
>3.15 g/cm³
Lower than that of alumina and zirconia, beneficial for low energy consumption
Vickers hardness
2000–2500 HV
Mohs hardness 9.5, extremely low wear rate
Fracture toughness
3.0–4.0 MPa·m¹/²
Very high hardness but limited toughness; avoid severe impact
Maximum service temperature
1600 °C
Excellent high‑temperature stability
Wear resistance
Wear rate 0.05–0.10‰/5 h
Suitable for long‑duration continuous grinding
Color
Black
Easy to identify
Main Application Scenarios
Stirred mill / vertical sand mill grinding: Low density and high hardness enable efficient wet ultra‑fine grinding.
Grinding of ultra‑hard materials: When grinding quartz sand, silicon carbide, and similar materials, efficiency is more than 40% higher than that of alumina balls.
High‑purity grinding: Grinding the same material (e.g., SiC powder) introduces no foreign impurities, eliminating the need for iron removal.
Corrosion‑resistant / high‑temperature environments: Suitable for coatings, textiles, pigments, printing, dyeing, and other industries.
Advantages & Characteristics
High strength and wear resistance: Wear rate is only 1/50 that of ordinary steel balls.
Corrosion resistance: Resists acids and alkalis, making it suitable for harsh chemical environments.
High‑temperature resistance: Maintains high strength up to 1000 °C and has a low coefficient of thermal expansion.
Non‑magnetic, non‑conductive, and insulating: Can be used in magnetic fields and allows oil‑free lubrication.
Comparison with Other Grinding Media
Parameter
Pressureless Sintered SiC Ball
Alumina Ball (99%)
Zirconia Ball
Density (g/cm³)
3.15–3.2
3.95
6.0
Mohs hardness
9.5
9
8.5–9
Vickers hardness (HV)
2000–2500
1800
1200–1600
Max. service temperature (°C)
1600
1000
400
Wear resistance
Excellent
Good
Excellent
Impact toughness
Low
Medium
Relatively high
Cost
High
Low
Medium to high
Typical application
Ultra‑hard material grinding
Fine grinding, general use
Balancing hardness and toughness
Usage Precautions
Avoid severe impact to prevent brittle fracture.
Recommended for stirred mills; not suitable for coarse grinding applications that involve heavy impact.
The relatively high cost means these balls are intended for demanding applications.
For further information or to discuss your specific requirements, please contact us directly.
