Microstructure and creep behavior of Al{sub}2O{sub}3-SiC ceramic matrix composites

摘要

The microstructure and creep behavior of monolithic Al{sub}2O{sub}3 and 10 vol% SiC particle reinforced Al{sub}2O{sub}3 matrix composites were investigated in air atmosphere at 1260°C. Two kinds of SiC particles were used, one with the average size 2.7μm has 3.4 vol% SiO{sub}2 impurities and the other with the average size 0.6μm has 1.7 vol% SiO{sub}2 impurities. Compared to the creep behavior of monolithic Al{sub}2O{sub}3, the creep resistance of the composites with 0.6μm SiC particles (ASS) was not improved, but the creep strain rate of the composites with 2.7μm SiC particles (ASL) decreased apparently. This difference was related to the different microstructure and oxidation behavior of the composites. Moreover, the composites exhibited a significant anelastic recovery on load removal, especially for ASL.