The reason for the deformation of alumina grinding balls during the roasting process may be that the particle size distribution of the alumina powder is too wide, the particle size is too large, or the selection and dosage of additives in the alumina powder are unreasonable.
The main reason for the fracture of the grinding balls after calcination is the internal defects of the alumina grinding balls, which is also related to the shrinkage of the grinding balls. For reasons of inconsistent shrinkage of steel balls, please refer to the analysis of the causes of roasting deformation. When the shrinkage rate is inconsistent, if there is a defect, the defect becomes the source of fracture, and the crack propagation causes the steel ball to crack.
When the grains grow abnormally, there are a large number of pores in these excessively large grains, which are difficult to discharge from the grains to the grain boundaries. This will make it difficult for ceramic materials to achieve higher densities and deteriorate many properties of the material, especially the mechanical properties (fracture toughness, flexural strength, etc.).
The results show that the density of alumina grinding balls is not uniform during the molding process (powder agglomeration, semi-finished product pressure gradient, and additives are not uniform), and the density is not uniform during the roasting process.
Specification Picture of Alumina Grinding Ball
Alumina Grinding Ball Picture
