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Temperature Dependence of in situ Constituent Properties of Polymer-infiltration-pyrolysis-processed Nicalon™ SiC Fiber-reinforced SiC Matrix Composite

Published online by Cambridge University Press:  31 January 2011

Shuqi Guo  and
Yutaka Kagawa
Shuqi Guo
Affiliation:
Institute of Industrial Science, The University of Tokyo, 7–22–1, Roppongi, Minato-ku, Tokyo 106–8558, Japan
Yutaka Kagawa*
Affiliation:
Institute of Industrial Science, The University of Tokyo, 7–22–1, Roppongi, Minato-ku, Tokyo 106–8558, Japan
*
a)Address all correspondence to this author. e-mail: kagawa@iis.u-tokyo.ac.
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Abstract

Temperature dependence of in situ fiber strength, effective interface shear stress, Young's modulus of matrix, and matrix fracture energy in a polymer-infiltrationpyrolysis (PIP)-processed two-dimensional plain-woven fabric carbon-coated Nicalon™ SiC fiber-reinforced SiC matrix composite was studied through a tensile test in air at 298 (room temperature), 800, and 1200 K. In situ fiber strength and effective interface shear stress were determined by fracture mirror size and fiber pullout length measurements, respectively. The fiber strength was insensitive to test temperature up to 800 K but dropped significantly at 1200 K. Conversely, the interface shear stress showed a strong temperature dependence, decreasing at 800 K and drastically increasing at 1200 K. The temperature dependence of both values was reasonably explained. Temperature dependence of Young's modulus of matrix was derived from Young's modulus of the composite and fiber and ranged from ≈40 to ≈38 GPa. Matrix fracture energy was also determined from the transverse matrix cracking stress and ranged from ≈16 to ≈5.5 J/m2. Both Young's modulus of matrix and the matrix fracture energy showed only slight temperature dependence up to 800 K; however, both values decreased significantly at 1200 K.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 4 , April 2000 , pp. 951 - 960
Copyright
Copyright © Materials Research Society 2000

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