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Mechanical behavior and failure phenomenon of an in situ-toughened silicon nitride (1990)

Salem, Jonathan A. ; Choi, Sung R. ; Jenkins, Michael G. ; [et al.]

In: CASI

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Publication Date: 2019-07-13

Description: The Weibull modulus, fracture toughness and crack growth resistance of an in-situ toughened, silicon nitride material used to manufacture a turbine combustor were determined from room temperature to 1371 C. The material exhibited an elongated grain structure that resulted in improved fracture toughness, nonlinear crack growth resistance, and good elevated temperature strength. However, low temperature strength was limited by grains of excessive length (30 to 100 microns). These excessively long grains were surrounded by regions rich in sintering additives.

Keywords: NONMETALLIC MATERIALS

Type: NASA-TM-103741 , E-5983 , NAS 1.15:103741 , Annual Pacific Coast Meeting; Oct 25, 1990 - Oct 27, 1990; Seattle, WA; United States

Format: application/pdf

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