Improved Processing Methods for Silicon Nitride Ceramics PUBLIC ACCESS

[+] Author Affiliations
S. Natansohn, A. E. Pasto

GTE Laboratories Incorporated, Waltham, MA

Paper No. 91-GT-316, pp. V005T13A020; 8 pages
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7902-3
  • Copyright © 1991 by ASME


This paper reviews the status of a program1 to develop silicon nitride ceramics of high strength and reliability, with the material performance goals being a tensile strength of 900 MPa at room temperature and 500 MPa at 1370°C, both with a Weibull modulus of 20. The selected process consists of injection molding and hot isostatic pressing of a silicon nitride formulation containing 6 w/o yttria as sintering aid. A comprehensive experimental approach has been adopted which consists of: a. complete characterization and subsequent modification of the starting silicon nitride powder in an attempt to correlate powder characteristics to ceramic properties; b. the design and fabrication of appropriate specimens for tensile strength testing; c. the implementation of alternate powder processing and shaping techniques, including the design of new compounding/molding equipment; and d. the expansion of non-destructive evaluation capabilities.

Copyright © 1991 by ASME
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