Abstract
Mullite composite ceramics contaning 20vol. % dispersed SiC particles (0. 12-1. 71μm) were prepared by hot-pressing at 1650°C under 35MPa for 4h. The effect of dispersed particle size on mechanical properties was investigated. Grain growth of mullite was prevented by the existence of dispersed SiC particles in the matrix, and the matrix grain size of mullite/SiC composites decreased with decreasing dispersed SiC particle size. As a result, bending strength for most mullite/SiC composites increased with decreasing dispersed particle size. In the case of mullite/SiC (0. 56μm), bending stregth showed a maximum value of 626MPa, which was about 60% higher than that of monolithic mullite. The influence of atmosphere of thermal treatment on bending strength of mullite/SiC composites was also investigated. It is concluded that the strengthening by thermal treatment in air was caused by healing of surface flaws in the specimen.
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