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Role of Fiber-Matrix Interfacial Shear Stress on the Toughness of Reinforced Oxide Matrix Composites

  • Raj N. Singh (a1)

Abstract

Mullite and zircon ceramic matrix composites uniaxially reinforced with as-supplied and BN-coated silicon carbide filaments were fabricated. The filament-matrix interfacial shear stresses were measured by a modified indentation technique and mechanical properties were determined in flexure mode. Significant improvements in strength and toughness were observed for the composites in comparison to monolithic mullite and zircon ceramics. Lower filament-matrix interfacial shear stresses were measured in composites with BN-coated filaments than in composites containing as-supplied filaments. The influence of filament-matrix interfacial shear stress on the critical stress for first matrix cracking, maximum composite strength, and toughness of the composites were studied.

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1. Singh, R.N. and Brun, M.K., “Effect of Boron Nitride Coatings On Fiber-Matrix Interactions,” Ceramic Eng. and Science Proc. Vol.8, No. 7–8, 636 (1987).
2. Brun, M.K. and Singh, R.N., “Effect of Thermal Expansion Mismatch and Fiber Coating On The Fiber/Matrix Interfacial Shear Stress in CMC's,” to be published in the J. Am. Ceram. Soc.
3. Singh, R.N., “LPCVD of Boron Nitride From Beta-trichloroborazine,” Proc. of the tenth international conference on chemical vapor deposition, p. 543 (1987); edited by Cullen, G.W., vol. 87–8, The Electrochemical Society.
4. Singh, R.N. and Gaddipati, A.R., “Mechanical Properties of a Uniaxially Reinforced Mullite-Silicon Carbide Composite,” Am, J., Ceram. Soc., 71(2), C100 (1988).
5. Laughner, J.W., Shaw, N.J., Bhatt, R.T., and DiCarlo, J.A., “Simple Indentation Method For Measurement Of Interfacial Shear Stress In SiC/Si3N4 Composites,” Ceramic Eng. and Science Proc. 7(7–8), 932(1986).
6. Aveston, J., Cooper, G.A., and Kelly, A., “Single and Multiple Fracture,” pp 15–26, in the Properties of Fiber Composites, Conference Proceeding of the National Physical Laboratory, IPC Science and Technology Press Ltd., Surrey, England, 1971.

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Role of Fiber-Matrix Interfacial Shear Stress on the Toughness of Reinforced Oxide Matrix Composites

  • Raj N. Singh (a1)

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