This paper describes the tensile behavior of high-temperature composite materials containing continuous Nicalon ceramic fiber reinforcement and glass and glass/ceramic matrices. The longitudinal properties of these materials can approach theoretical expectations for brittle matrix composites, failing at a strength and ultimate strain level consistent with those of the fibers. The brittle, high-modulus matrices result in a nonlinear stress-strain curve due to the onset of stable matrix cracking at 10 to 30 percent of the fiber strain to failure, and at strains below this range in off-axis plies. Current fibers and matrices can provide attractive properties well above 1000°C, but composites experience embrittlement in oxidizing atmospheres at 800 to 1000°C due to oxidation of a carbon interface reaction layer. The oxidation effect greatly increases the interface bond strength, causing composite embrittlement.
Tensile Behavior of Glass/Ceramic Composite Materials at Elevated Temperatures
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Mandell, J. F., Grande, D. H., and Jacobs, J. (July 1, 1987). "Tensile Behavior of Glass/Ceramic Composite Materials at Elevated Temperatures." ASME. J. Eng. Gas Turbines Power. July 1987; 109(3): 267–273. https://doi.org/10.1115/1.3240035
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