Improvement of wear resistance of grinding balls

Particle morphology: Ceramics are made of pressed bodies fired at high temperatures, and the bodies are pressed by particles. Therefore, the sintering of ceramics is not only the sintering behavior between particles, but more importantly, the sintering behavior of the green body. Sintering is an important part of ceramic firing. There are many factors that affect the sintering of the green body, and the intrinsic factor is the characteristics of the powder. Powder characteristics are one of the important factors affecting sintering. Surface energy is one of the driving forces for particle sintering. The morphology affects the surface energy of particles.
The noise is very large, so the influence of particle morphology on ceramic sintering is considerable.

Particles with rough surfaces have a relatively large specific surface area or surface energy, so they have a large sintering driving force, are easy to sinter, have high sintering density, and have small and few pores. surface
Granular particles with smooth surfaces. The specific surface area or surface energy of this particle is relatively small, so its sintering driving force is small and it is difficult to sinter. The sintering density of ceramics is
It is lower, with large and numerous holes. Compared with granular particles, plate-shaped particles have a larger specific surface area, greater sintering driving force, and are easier to sinter. The sintering density of ceramics is higher. Compared with green bodies composed of small hard agglomerates and no agglomerates, the porosity is larger and the green density is lower. The density of ceramics is also smaller, and the sintering density of ceramics is lower.

Particle size: When the grains are relatively small, the wear mechanism is mainly plastic deformation and partial transgranular fracture, resulting in slight wear. When the grains are relatively coarse, the wear mechanism is mainly grain boundary fracture, resulting in severe wear. Therefore, the smaller the grains, the better the wear resistance of ceramics. Therefore, aluminum oxide raw materials with small particle sizes should be used as much as possible to reduce the grain size of ceramics. In addition, compared with large particles, the specific surface area or surface energy of small particles is relatively
Large, so its sintering driving force is large, the sintering temperature is low, and the sintering density is high.