Abstract
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, non-linear crack-growth resistance, and good elevated-temperature strength. However, low-temperature strength was limited by grains of excessive length (30–100 μm). These excessively long grains were surrounded by regions rich in sintering additives.
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J. A. Salem, J. Manderscheid, M. Freedman and J. Gyekenyesi, J. Gas Turbines Engng, in press.
J. P. Gyekenyesi, J. Engng Gas Turbine Power 108 (1986) 540.
K. N. Siebein and W. M. Lovington, in “Microstructural Science”, Vol. 16, “Metallography of Advance Materials”, edited by H. J. Cialone (International Metallographic Society, Columbus, OH, 1988) p. 319.
“Young's Modulus, Shear Modulus, and Poisson's Ratio for Ceramic Whitewares by Resonance”, ASTM Standard Test Method C848-88 (American Society for Testing and Materials, Philadelphia, PA, 1988).
T. Nose and T. Fujii, J. Amer. Ceram. Soc. 71 (1988) 328.
D. Munz, R. T. Bubsey and J. L. Shannon Jr, ibid. 63 (1980) 300.
M. J. Jenkins, J. A. Salem and S. G. Seshardri, J. Compos. Mater. 23 (1989) 77.
K. F. Krause, J. Amer. Ceram. Soc. 71 (1988) 338.
K. Jakus, J. E. Ritter Jr, T. Service and D. Sonderman, ibid. 64 (1981) C-174.
S. A. Szatmary, J. P. Gyekenyesi and N. N. Nemeth, NASA Technical Memorandum 103247 (1990).
J. A. Salem, NASA Technical Memorandum 102 423 (1990).
P. Chantikul, G. R. Anstis, B. R. Lawn and D. B. Marshall, J. Amer. Ceram. Soc. 64 (1981) 539.
S. R. Choi and J. Salem, “Strength and Fracture Toughness Properties of Whisker Reinforced Silicon Nitride Matrix Composite and Monolithic Silicon Nitride”, edited by Michael D. Sacks, Presented at the Symposium on Composites sponsored by American Ceramics Society, Orlando, FL, 12–15 November 1990 (The American Ceramic Society, Inc., Westerville, OH, 1991).
J. E. Ritter, S. R. Choi, K. Jakus, P. J. Whalen and R. G. Rateick, J. Mater. Sci. 26 (1991) 5543.
C. W. Li and Y. Yamanis, Ceram. Engng Soc. Proc. 10 (1989) 632.
K. Kendall, N. M. Ashford, S. R. Tan and J. D. Birchall, J. Mater. Res. 1 (1986) 120.
R. F. Cook and D. R. Clarke, Acta Metall. 36 (1988) 555.
D. K. Shetty and J. S. Wang, J. Amer. Ceram. Soc. 72 (1988) 1158.
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Salem, J.A., Choi, S.R., Freedman, M.R. et al. Mechanical behaviour and failure phenomenon of an in situ toughened silicon nitride. J Mater Sci 27, 4421–4428 (1992). https://doi.org/10.1007/BF00541575
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DOI: https://doi.org/10.1007/BF00541575