Effect of prior heat treatment for commercial-grade aluminum nitride powder in gas atmospheres and activating additions on the structure and properties of hot-pressed ceramics based on it

Abstract

The effect of carbon-containing additions and prior heat treatment in hydrogen and nitrogen for commercialgrade AlN powder on the chemical composition, structure, and also some physicomechanical properties of hot-pressed ceramics based on it are studied. It is shown that hot pressing occurs mainly in the solid phase. The fracture mechanism for hot-pressed ceramics varies from intercrystalline (using unprocessed AlN powder) to predominantly transcrystalline, the grain size of the basic phase decreases, and thermal conductivity and strength parameters increase.