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Mechanical properties of Al2O3 and Al2O3 + ZrO2 ceramics reinforced by SiC whiskers

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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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Authors and Affiliations

  1. Department of Metals and Technology, Harbin Institute of Technology, 150 006, Harbin, People’s Republic of China

    G. Y. Lin, T. C. Lei, Y. Zhou & S. X. Wang

Authors
  1. G. Y. Lin
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  2. T. C. Lei
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  3. Y. Zhou
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  4. S. X. Wang
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Lin, G.Y., Lei, T.C., Zhou, Y. et al. Mechanical properties of Al2O3 and Al2O3 + ZrO2 ceramics reinforced by SiC whiskers. JOURNAL OF MATERIALS SCIENCE 28, 2745–2749 (1993). https://doi.org/10.1007/BF00356212

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  • DOI: https://doi.org/10.1007/BF00356212

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