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Fabrication, characterization and mechanical properties of SiC-whisker-reinforced Y-TZP composites

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The microstructure and mechanical properties of hot-pressed yttria-stablized tetragonal zirconia polycrystals (Y-TZP) reinforced with up to 30 vol % SiC whiskers were investigated. The homogeneously dispersed and fully dense SiC whisker/Y-TZP composites were fabricated by wet-mixing the constitutents and uniaxially hot-pressing the resulting powder. The grain size of the matrix depended on the whisker volume fraction and the hot-pressing temperature. The significant increase of fracture toughness of about MPa m1/2 at 10 Vol % SiC and a small increase in strength were achieved by uniformly dispersing the whiskers in the Y-TZP matrix. Fracture surfaces revealed evidence of toughening by the mechanisms of crack deflection, pullout, and crack bridging by the whiskers and also a phase transformation of ZrO2. The observed increase in the fracture toughness of Y-TZP due to the addition of SiC whiskers was correlated with existing models of toughening mechanisms. Good agreement was achieved between the theoretical predictions and the experimental toughness values, obtained from the Y-TZP/SiCw composites.

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Authors and Affiliations

  1. The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, P. R. China

    Guo -Dong Zhan, Jian -Lin Shi, Yang Zhou, Yi -Zeng Zhang, Ting -Rong Lai & Tung -Sheng Yen

  2. Dept. of Materials Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, P. R. China

    Yang Zhou & Yi -Zeng Zhang

Authors
  1. Guo -Dong Zhan
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  2. Jian -Lin Shi
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  3. Yang Zhou
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  4. Yi -Zeng Zhang
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  5. Ting -Rong Lai
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  6. Tung -Sheng Yen
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Zhan, G.D., Shi, J.L., Zhou, Y. et al. Fabrication, characterization and mechanical properties of SiC-whisker-reinforced Y-TZP composites. JOURNAL OF MATERIALS SCIENCE 31, 3237–3243 (1996). https://doi.org/10.1007/BF00354674

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  • DOI: https://doi.org/10.1007/BF00354674

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