Oxidation and temperature effects on the interfacial shear strength in SCS-6 fiber-reinforced reaction-bonded silicon nitride
- Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering
The fiber/matrix interfacial shear strength of Textron SCS-6 SiC-fiber-reinforced reaction-bonded Si{sub 3}N{sub 4} (RBSN) was studied as a function of temperature after oxidation for 24 h at 600 C. Fiber push-out experiments were conducted using a diamond indenter in a high-temperature microhardness tester under vacuum. The interfacial shear strength increased with temperature because of the relief of residual tensile stresses arising from the difference in thermal expansion coefficients between the fiber and the matrix. Most of sublayer 2 of the fiber outer coating, which mainly consisted of carbon in the form of BSU (basic structure unit) aggregates, had disappeared after the heat treatment of the composite. Oxidation resulted in severe changes in the fiber outer coating and caused a lower interfacial shear strength with respect to that of the unoxidized composite.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 182677
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 78; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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