Abstract
High-temperature strength, fracture behavior and microstructure were observed for monazite-coated alumina fiber-reinforced alumina matrix composites hot-pressed at 1200-1300°C. The composites with 27-41 vol% alumina fiber showed no significant change in strength at 25-1100°C. However, the strength of the composites decreased markedly at a test temperature higher than 1100°C. The composites hot-pressed at a temperature lower than 1250°C fractured in a pseudoductile manner in the test temperature range from 25°C to 1100°C. Young's modulus of the elastic region decreased with increasing test temperature. These composites showed larger deformation at a test temperature above 1100°C. On the other hand, the composites hot-pressed at more than 1250°C fractured in a brittle manner at 25°C-1200°C of test temperature. The fracture energy of the composite increased with increasing test temperature and decreased with sintering temperature.
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