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Preparation and mechanical properties of high-purity Al2O3 fibre/Al2O3 matrix composite

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Abstract

Al2O3 matrix composites with unidirectionally oriented high-purity Al2O3 fibre with and without carbon coating, were fabricated by the filament-winding method, followed by hot-pressing at 1573–1773 K. The composite with non-coated Al2O3 fibre exhibited a bending strength (594 MPa) comparable to that of monolithic Al2O3 (589 MPa). While the composite with a carbon-coated fibre had lower strength (477 MPa), it showed improved fracture toughness (6.5 MPa m1/2) compared to the composite with an uncoated fibre (4.5 MPa m1/2) and monolithic Al2O3 (5.5 MPa m1/2). This toughness enhancement was explained based on the increased crack extension resistance caused by the fibre pull-out observed by SEM at the notch tip.

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Authors and Affiliations

  1. Osaka National Research Institute, Midorigaoka 1-8-31, Ikeda Osaka, 563, Japan

    K UENO & T INOUE

  2. Osaka Electro-Communication University, Hatsucho 18-8, Neyagawa, 572, Japan

    T MITSUHATA

Authors
  1. K UENO
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  2. T INOUE
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  3. T MITSUHATA
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UENO, K., INOUE, T. & MITSUHATA, T. Preparation and mechanical properties of high-purity Al2O3 fibre/Al2O3 matrix composite. Journal of Materials Science 32, 2031–2035 (1997). https://doi.org/10.1023/A:1018506301909

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  • DOI: https://doi.org/10.1023/A:1018506301909

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