Abstract

In SiC-borosilicate glass matrix composites, formation of cristobalite has a detrimental effect on mechanical properties. The nucleation and growth of cristobalite can be suppressed in the matrix by hot-pressing at higher temperatures (1100° C). However, nucleation at the fibre-matrix interface, related to fibre chemistry and interface diffusion, cannot be eliminated. At these higher temperatures, a well defined C-rich layer forms at the fibre-matrix interface. Low-temperature annealing induces segregation of minor elements within the interface diffusion band.

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