Ceramic grinding balls are made by pressing the green body through high-temperature firing, and the green body is made by pressing the particles, so the sintering of ceramic grinding balls is not only the sintering behavior between particles, but more important is the sintering behavior of the green body. Sintering is an important step in the firing of ceramic grinding balls. There are quite a few factors that affect the sintering of the green body, and the internal 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.
Morphology has a great influence on the surface energy of particles. Therefore, the influence of particle morphology on the sintering of ceramic grinding balls is quite large. Rough-surface particles have a relatively large specific surface area or surface energy, so they have a large sintering driving force, easy sintering, large sintering density, and small holes. Granular particles with a smooth surface. The specific surface area or surface energy of this particle is relatively small. Therefore, its driving force for sintering is relatively small, and it is not easy to sinter. The sintering density of ceramic grinding balls is relatively low, and there are many voids. Compared with granular particles, plate-shaped particles have a larger specific surface area, a greater driving force for sintering, and are easier to sinter. The sintering density of ceramic grinding balls is relatively large. Compared with the green body composed of small hard agglomerates and non-agglomerates, the porosity is large, the green density is small, the density of the ceramic grinding balls is also small, and the sintering density of the ceramic grinding balls is low .
