Features of Obtaining Ceramic Materials from Sintering-Active Powders

Abstract

Microstructure defects arising in the manufacture of oxide ceramics based on aluminum oxide were studied. Several common problems arising in the manufacture of ceramic materials from fine-grained starting powders with high sintering activity as well as differences in the optimal properties of materials intended for use at high and moderate temperatures were considered. Samples of ceramic materials of the mullite–corundum system modified with zirconium dioxide were obtained by co-deposition of the initial powders followed by their grinding, pressing, and sintering. The fracture surfaces of samples were examined on a scanning electron microscope to study defects in the microstructure of powder ceramics. Characteristic defects in the microstructure were identified. The reasons for their appearance were explained. Possible ways to solve the problems of degradation of the properties of oxide ceramic materials were proposed based on technical literature data and the experimental results.