Application of white aluminum oxide in improving the wear resistance of ceramics
The application of white aluminum oxide in improving the wear resistance of ceramics is mainly reflected in the following aspects:
1. As a filler or reinforcing agent
Improving hardness and compressive strength
White aluminum oxide owns high hardness (Mohs hardness 9.0). Adding it to the ceramic matrix can significantly improve the hardness and compressive strength of the product, making it less likely to break when subjected to external force or friction.
Optimizing microstructure
White aluminum oxide particles are evenly distributed in the ceramic material, forming a dense bond with the matrix, effectively reducing internal defects of the material, thereby enhancing overall wear resistance.
2. Used in surface treatment processes
Grinding and polishing media
As a grinding medium,white aluminum oxide can be used to finely process the ceramic surface, improve surface finish and reduce micro cracks, and reduce the wear rate in subsequent use.
Anti-slip coating enhancement
Adding white aluminum oxide micropowder to the ceramic coating increases the surface roughness by forming a tiny convex structure, which not only improves the anti-slip performance but also enhances the wear life of the coating.
3. Stability support in high temperature environment
Maintaining high temperature wear resistance
The high temperature stability of white aluminum oxide (melting point 2050℃) ensures that ceramic products can still maintain structural stability and wear resistance under high temperature conditions, and is suitable for refractory ceramics or high-temperature industrial parts.
Firing process optimization
As a firing aid, white aluminum oxide can increase the sintering temperature of ceramics, promote the bonding strength between grains, and further improve the wear resistance and mechanical strength of the finished product.
4. Special functional ceramic applications
Ceramic grinding wheel enhancement
Adding white aluminum oxide particles to the ceramic bond grinding wheel can extend the tool life and improve the grinding efficiency of high-hardness materials by improving the hardness and self-sharpening of the grinding wheel.
Wear-resistant ceramic composite materials
White aluminum oxide is compounded with materials such as silicon carbide and zirconium oxide to prepare special ceramic products such as super-wear-resistant ceramic tools and wear-resistant liners.
5. Microscopic mechanism analysis
The α-Al₂O₃ crystal structure of whtie aluminum oxide has excellent resistance to plastic deformation. Its high elastic modulus (380GPa) can effectively disperse stress when the ceramic is subjected to friction, and improve wear resistance by hindering crack propagation.