The purpose of this study was to evaluate the mechanical strength and slow-crack-growth parameter values for two commercially available silicon nitrides, SN-88 and NT164, at three high-temperature conditions. Weibull analysis and dynamic fatigue slow-crack-growth parameters were used to characterize the material strength and resistance to slow crack growth at high temperatures for use in life prediction models. Although both materials are commercially available Si3N4, their high-temperature behavior was found to be significantly different.

Issue Section:
Gas Turbines: Ceramics
Topics:
Ceramics, Fatigue testing, Fracture (Materials), Gas turbines, High temperature, Strength (Materials), Fatigue, Silicon
1.
Weibull
W.
, “
A Statistical Distribution Function of Broad Applicability
,”
ASME Journal of Applied Mechanics
, Vol.
18
,
1951
, pp.
293
–
297
.
2.
Davidge, R. W., Mechanical Behavior of Ceramic: Cambridge Solid State Science Series, Cambridge University Press, 1979.
3.
Berens, A., personal communication, 1994.
4.
Evans, A. G., “Fracture Mechanics Determinations,” Fracture Mechanics of Ceramics, R. C., Grandt, ed., Vol. 4, Plenum Press, New York, 1978.
5.
Ritter
J. E.
,
Bandyopadhyay
N.
, and
Jakus
K.
, “
Statistical Reproducibility of the Crack Propagation Parameter N in Dynamic Fatigue Test
,”
J. Amer. Ceram. Soc.
, Vol.
62
, No.
9–10
,
1900
, pp.
542
–
543
.
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