Abstract

Discussed is the influence of refractory oxide coating on failure characteristics of fibers such as boron and silicon carbide continuous fibers. Weibull statistics are used for analyzing the experimental data. Fractographic and morphologic studies revealed two different mechanisms of failure; they correspond to fracture surface structures with different thermodynamic stability. Mechanical properties of composites are improved when fibers are coated with protective Y 2O 3 and embedded in a metal or ceramic matrix.

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