Chapter 54. Continuous Sintering of Si3N4 in a Controlled Atmosphere Belt Furnace'

  1. John B. Wachtman Jr.
  1. Dale E. Wittmer1,
  2. Thomas E. Paulson1 and
  3. Charles W. Miller Jr2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313954.ch54

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8

How to Cite

Wittmer, D. E., Paulson, T. E. and Miller, C. W. (1994) Continuous Sintering of Si3N4 in a Controlled Atmosphere Belt Furnace', in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313954.ch54

Author Information

  1. 1

    Southern Illinois University Carbondale, IL

  2. 2

    Centorr Furnaces/Vacuum Industries Nashua, NH

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375174

Online ISBN: 9780470313954

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Keywords:

  • microstructure;
  • optimum;
  • atmosphere;
  • temperature;
  • furnace

Summary

A commercially available belt furnace was used to continuously sinter Si3N4, containing 4 wt.% Al2O3 and 13 wt.% Y2O3. Optimum sintered density (99 % of theoretical) was achieved at 1667°C for 90 min. in flowing N2. For these conditions a microstructure with uniform, fine porosity and well developed, elongated β-Si3N4 grains was obtained. For these conditions a microstructure with uniform, fine porosity and well developed, elongated β-Si3N4 grains was obtained. The average four-point flexural strength was found to be 969 ± 45 MPa (140 ± 7 ksi) with a Weibull modulus of 21, and the fracture toughness by modified indentation was 7.2 ± 0.5 MPa-m1/2. These properties were significantly improved over those determined for the same Si3N4 composition sintered in a batch furnace and results reported for a similar conventionally sintered commercial Si3N4.