Chapter 56. Gas Pressure Sintering Silicon Nitride Ceramics Using Rare Earth and Transition Metal as Sintering Aids

  1. Ersan Ustundag and
  2. Gary Fischman
  1. A. J. N. Dias1,
  2. J. Duailibi Fh1,
  3. C. A. Vilardo1,
  4. T. C. Silva1 and
  5. M. C. S. Nóbrega2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294574.ch56

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 20 Issue 4

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 20 Issue 4

How to Cite

Dias, A. J. N., Fh, J. D., Vilardo, C. A., Silva, T. C. and Nóbrega, M. C. S. (1999) Gas Pressure Sintering Silicon Nitride Ceramics Using Rare Earth and Transition Metal as Sintering Aids, in 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 20 Issue 4 (eds E. Ustundag and G. Fischman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294574.ch56

Author Information

  1. 1

    Instituto Nacional de Tecnologia Av. Venezula 82/603 — Rio de Janeiro RJ — Brazil CEP 20081–310

  2. 2

    COPPE/UFRJ Cidade Universitária, bl F-204 Rio de Janeiro-RJ-Brazil

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1999

ISBN Information

Print ISBN: 9780470375648

Online ISBN: 9780470294574

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Keywords:

  • oxides;
  • ceramics;
  • grains;
  • silicon;
  • amorphous

Summary

Silicon nitride ceramics with additions of 3wt.% of yttria together with 2wt% of rare earth and transition metals oxides, were gas pressure sintered using multiple steps of temperature and pressure. Compositions containing La2O3, Nd2O3 and Sm2O3, and the transition metals oxides, Cr2O3, Cd2O3 and TiO2, were tested. The results showed that gas pressure sintering (GPS) is a possible way to process these ceramics to high density. Also, the final density and aspect ratio of β-Si3N4 grains are strongly dependent of soaking time in the last step of temperature and pressure.