Abstract
Microstructural evolution adn densification kinetics of Al2O3‐SiC powder composites were studied using two different SiC powders. Examination of the microstructural evolution of Al2O3‐fine SiC powder composites showed three well‐defined stages of densification: the first was characterized by constant pore size and no grain growth; the second involved rapid pore coarsening and grain growth; the third was characterized by pore shrinkage and slow grain growth. Studies of the densification kinetics of Al2O3‐coarse SiC powder composites exhibited two stages of densification: in the first stage there were no significant differences in densification rate between pure Al2O3 compacts and composites; in the second stage, however, differences in densification behavior between pure Al2O3 compacts and composites became pronounced.
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