3mm-4mm Pressureless Sintered Silicon Carbide Grinding Balls

Specifically engineered for high-intensity, high-purity grinding applications in the mining, ceramics, and chemical industries, offering exceptional durability and grinding efficiency.

These grinding balls are produced from high-purity, submicron silicon carbide powder using a roll‑pressing technique, followed by pressureless sintering in a vacuum furnace at 2100–2200 °C. The resulting SSiC grinding balls feature a Vickers hardness (HV10) ≥ 2300, a bending strength ≥ 350 MPa, a fracture toughness ≥ 4.0 MPa·m¹/², and a wear loss as low as 0.01–0.02 g/kg·h. Their dense, non‑porous microstructure provides excellent resistance to acids, alkalis, and high temperatures, with a long‑term service temperature of up to 1600 °C in air.

• Ultra‑high wear resistance – Wear loss is only 1/5 to 1/10 that of conventional alumina balls, significantly extending replacement intervals and lowering operating costs.

• Contamination‑free grinding – The high‑purity SSiC material generates minimal and chemically inert wear debris, ensuring the purity of the ground product.

• Excellent impact resistance – With a fracture toughness ≥ 4.0 MPa·m¹/², these balls are well‑suited for high‑energy grinding equipment such as high‑speed stirred mills and planetary mills.

• High crushing strength – The high single‑ball crushing strength minimises breakage during grinding, reducing the risk of fractured media.

• High‑temperature and corrosion resistance – Suitable for long‑term service up to 1600 °C and resistant to strong acids, alkalis, and organic solvents.

• Dense microstructure – Near‑theoretical density (≥ 3.10 g/cm³) is achieved through pressureless sintering, resulting in extremely low porosity.

Note: Crushing strength is diameter‑dependent – larger balls exhibit higher crushing force values. Typical values for other diameters are available upon request.

1. Powder preparation – High‑purity, submicron α‑SiC powder with a narrow particle size distribution is selected.

2. Forming – Roll pressing ensures high sphericity and excellent dimensional consistency.

3. Drying – A controlled drying profile prevents cracking of the green bodies.

4. Sintering – Pressureless sintering is performed in a high‑vacuum furnace at 2100–2200 °C to achieve full densification.

5. Finishing – Surface polishing or size classification is carried out as required.

6. Quality inspection – Each batch is tested for hardness, density, wear loss, and crushing strength to ensure consistent performance.

• Mining & Metallurgy – Fine grinding of gold, copper, and iron ores; heavy medium separation; coal pulverisation.

• Advanced Ceramics – High‑purity grinding of ceramic powders such as alumina, zirconia, silicon nitride, and silicon carbide; dispersion of glazes and pigments.

• Chemicals & Coatings – Ultra‑fine grinding and dispersion of titanium dioxide, calcium carbonate, silica powder, pigments, dyes, and pesticide suspensions.

• Battery Materials – De‑agglomeration and nano‑scale grinding of lithium iron phosphate (LFP), NCM cathode materials, and graphite anodes.

• Other high‑purity applications – Electronic materials, cosmetics, food additives, pharmaceutical excipients, and more.

For further information or to discuss your specific requirements, please contact us directly.