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R-curve behaviour and microstructure of liquid-phase sintered α-SiC

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Abstract

R-curves for two liquid-phase sintered α-SiC (SC-A and SC-B), of different microstructures, were characterized using indentation-strength method. Silicon carbide SC-B, with its coarser microstructure and 8 MPa · m1/2 toughness, showed higher resistance to crack growth and more damage tolerance than silicon carbide SC-A, with its finer microstructure and 4.5 MPa · m1/2 toughness. These results suggest that a coarse microstructure is beneficial to toughening and damage tolerance while a fine microstructure is beneficial to strengthening.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The University of Seoul, Seoul, 130-743, Korea

    Jae-Yeon Kim & Hyun-Gu An

  2. Department of Materials Science and Engineering, The University of Seoul, Seoul, 130-743, Korea

    Young-Wook Kim

  3. National Institute for Research in Inorganic Materials, Ibaraki, 305, Japan

    M. Mitomo

Authors
  1. Jae-Yeon Kim
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  2. Hyun-Gu An
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  3. Young-Wook Kim
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  4. M. Mitomo
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Kim, JY., An, HG., Kim, YW. et al. R-curve behaviour and microstructure of liquid-phase sintered α-SiC. Journal of Materials Science 35, 3693–3697 (2000). https://doi.org/10.1023/A:1004894906697

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