CERAMIC-METAL AND CERAMIC-INTERMETALLIC COMPOSITES BY REACTIVE PROCESSING

摘要

Ceramic-metal and ceramic-intermetallic composites were prepared by reactive hot pressing. The ceramic to metal ratio of each composition was set by the stoichiometry of a thermodynamically favorable displacement reaction. The powder mixing method and the heating rate during hot pressing were found to have a profound influence on the final microstructure and properties of hot pressed composites. The best composites, judged by mechanical properties, were produced by hot pressing attrition milled precursors using 1 deg C/min heating rates. The four-point bend strength, fracture toughness, Young's modulus, and hardness were measured for A1_2O_3-MoSi_2, A1_2O_3-Ni, and A1_2O_3-Nb composites.