Abstract
The effect of the SiC whisker content on the mechanical properties of Al2O3 and Al2O3 + 20 vol% ZrO2 (2 mol% Y2O3) ceramic composites has been investigated. It is shown that the strength and fracture toughness of the composites are increased by the addition of 0–30 vol% SiC whiskers with only one exception that 30 vol% SiC whisker leads to a decrease in the flexure strength. The addition of 20 vol% ZrO2 (2 mol% Y2O3) significantly improves the mechanical properties of the Al2O3 + SiC whisker (SiCw) composites and the t-m phase transformation of ZrO2 is enhanced by the residual stresses caused by the thermal incompatibility between the SiCw and the matrix. The toughening effect of both SiC whiskers and the t-m phase transformation of ZrO2 (2 mol% Y2O3) is shown to be additive, but the addition of ZrO2 decreases the strengthening effect of the SiC whiskers.
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