Abstract
The hot-pressing temperature, matrix grain size, fracture mode and the distribution of SiC were studied to reveal the effect of SiC inclusions on the microstructure of Al 2O 3. Al 2O 3–SiC composite powder was prepared by the precipitation method. Nanoscale SiC particles were coated with Al 2O 3. After hot pressing, most of nanoscale SiC particles were randomly located within the Al 2O 3 grains. SiC inclusions raised the hot-pressing temperature, decreased Al 2O 3 grain size, and inhibited the abnormal grain growth of Al 2O 3. The intergranular fracture for Al 2O 3 was transformed to the intragranular fracture for Al 2O 3–SiC nanocomposites because of the addition of SiC. All those microstructure changes increased the mechanical properties of Al 2O 3-composites by 40%.
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