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Behavior of Crack Growth Resistance in Toughened Silicon Nitride Ceramics

Published online by Cambridge University Press:  15 February 2011

H. Kawamoto ,
K. Hiramatsu ,
Y. Takigawa ,
A. Okada  and
H. Usami
H. Kawamoto
Affiliation:
R&D Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587Japan
K. Hiramatsu
Affiliation:
R&D Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587Japan
Y. Takigawa
Affiliation:
R&D Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587Japan
A. Okada
Affiliation:
Scientific Research Laboratory, Nissan Motor Co., Ltd., Yokosuga, 237-8523Japan
H. Usami
Affiliation:
Meijo University, Nagoya, 468-8502Japan
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Abstract

Testing methods for crack-growth resistance-curve (R-curve) behavior were investigated and developed to analyze the toughened mechanism in polycry stalline ceramics. These methods are a biaxial-flexure method for small-scale disc-shaped specimens with micro-indentation cracks and a single-edged notched beam flexural method with crack stabilizers. In both methods, the growing crack length is measured directly as a function of applied stress, using the system that consist of a microscope and a CCD camera. Applying these testing methods, R-curve behavior of a toughened silicon nitride with a preferred orientation of elongated grains was evaluated to characterize the toughened mechanism, comparing with the behavior in a commercially available silicon nitride. The behavior having these rising R-curves is discussed with emphasis on the effects of microstructure such as grain-growth and grain-orientation, and resultant grain-bridgings behind the crack-tip.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 539: Symposium M – Fracture & Ductile vs. Brittle Behavior - Theory, Modelling… , 1998 , 113
Copyright
Copyright © Materials Research Society 1999

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References

1. Kawamoto, H., Ceramic Transactions Volume 49, Am. Ceram. Soc., 173 (1995).Google Scholar
2. Hirao, K., Ohashi, M., Brito, M. E., and Kanzaki, S., J. Am. Ceram. Soc., 78 [6], 1687 (1995).Google Scholar
3. Smith, S. M. and Scattergood, R. O., J. Am. Ceram. Soc., 79 [1], 129 (1996).Google Scholar
4. Smith, S. M. and Scattergood, R. O., J. Am. Ceram. Soc., 75 [2], 305 (1992).Google Scholar
5. Marshall, D. B., Am. Ceram. Soc. Bull., 59 [5], 551 (1980).Google Scholar
6. Okada, A., Hiramatsu, K., and Usami, H., 6th Int. Sym. on Ceramic Materials and Components for Engines, (Japan Fine Ceramics Association, Tokyo, 1997), p.770.Google Scholar
7. Srawly, J. E., Int. J. Fract. Mech., 12, 475 (1976).Google Scholar
8. Gilbert, C. J., Cao, J. J., De Jonghe, L. C., and Ritchie, O., J. Am. Ceram. Soc., 80 [9], 2253 (1997).Google Scholar
9. Rice, R. W., J. Am. Ceram. Soc., 77 [9], 2479 (1994).Google Scholar
10. Lawn, B., Fracture of brittle solids, 2nd ed. (Cambridge Univ. Press, Cambridge, 1993), p.44.Google Scholar