Chapter 37. Cost-Effective Sintered Reaction-Bonded Silicon Nitride for Structural Ceramics
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1993 The American Ceramic Society
A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2
How to Cite
Tiegs, T. N., Kiggans, J. O. and Ploetz, K. L. (1993) Cost-Effective Sintered Reaction-Bonded Silicon Nitride for Structural Ceramics, in A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314050.ch37
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375235
Online ISBN: 9780470314050
- silicon nitride;
- creep resistance;
- silicon powders;
- exothermic reaction
Sintered silicon nitride has many superior properties; however, for most applications these materials are too expensive to compete with metal parts. Sintered reaction-bonded silicon nitride (SRBSN) is more ecomonical, with raw material costs < 20% of those of comparable high-purity materials, making it competitive with metal parts. Conventional processing of SRBSN requires long nitridation times and a two-step firing process. Microwave (MW) heating reduces the reaction times and is performed in a one-step process, thereby simplifying the operation. The mecahnical properties of the MW-SRBSN are not equal to those of the higher-cost powders, but are appropriate for a number of applications at lower temperatures and stress levels. At ambient temperature, typical strength, toughness, and hardness values are 480 MPa, 4.8 MPa√m, and 14 GPa, respectively.