Chapter 14. Mechanical Properties of Silicon Carbide Ceramics Densified with Rare-Earth Oxide and Alumina Additions

  1. Mrityunjay Singh and
  2. Todd Jessen
  1. You Zhou,
  2. Kiyoshi Hirao,
  3. Motohiro Toriyama,
  4. Yukihiko Yamauchi and
  5. Shuzo Kanzaki

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294680.ch14

25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3

25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3

How to Cite

Zhou, Y., Hirao, K., Toriyama, M., Yamauchi, Y. and Kanzaki, S. (2001) Mechanical Properties of Silicon Carbide Ceramics Densified with Rare-Earth Oxide and Alumina Additions, in 25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 22, Issue 3 (eds M. Singh and T. Jessen), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294680.ch14

Author Information

  1. National Industrial Research Institute of Nagoya 2268–1 Shimo-Shidami, Moriyama-ku, Nagoya 463–8687, Japan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2001

ISBN Information

Print ISBN: 9780470375730

Online ISBN: 9780470294680

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Keywords:

  • chemistry;
  • microstructures;
  • cationic;
  • lanthanum;
  • microstructure

Summary

Based on the processing strategy of improving the mechanical properties of liquid-phase-sintered materials by tailoring the secondary phase chemistry, four rare-earth oxides (RE2O3), La2O3, Nd2O3, Y2O3 and Yb2O3, in combination with alumina, were used as sintering aids for a submicron-size β-SiC powder. Doped with 5 vol% RE2O3+Al2O3 additives, all samples were densified to near theoretical densities by hot pressing at 1800°C. The phase compositions, microstructures and mechanical properties of the various SiC ceramics were characterized. It was found that a decrease in the cationic radius of the rare-earth oxides was accompanied by an increase in the hardness and flexural strength and a decrease in the fracture toughness of the SiC ceramics.