Abstract
The hot hardness of Si 3N 4 tool materials of the CeO 2 and CeO 2AIN doping systems, oxidation in air from 900 to 1450 °C, and turning of tool steel with ceramic inserts of the same compositions were investigated to determine the effect of the N content of intergranular phase. Si/N grain boundary diffusion was found to be the main controlling mechanism at high temperature for densification, mechanical behavior and chemical degradation of these materials in air, the passivation oxidation rate of the CeO 2AINSi 3N 4 system being dependent on the atomic fraction of N of the intergranular phase, with lower values for the N-rich compositions.
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