Abstract
The microstructure of Nicalon-reinforced borosilicate glass was studied using scanning acoustic microscopy (SAM) and scanning electron microscopy (SEM), Acoustic micrographs exhibited high contrast, and the formation of Rayleigh-wave-interference fringes both within and around fibres allowed thein-situ-fibre and matrix elastic moduli to be estimated. The matrix was found to have undergone partial devitrification resulting in the formation of cristobalite. The presence of a high volume fraction of reinforcing fibres was found to have little effect on cristobalite formation and distribution. The thermal expansion mismatch between β-cristobalite and the devitrified glass matrix and the β/α-cristobalite phase change were found to give rise to extensive microcracking around individual cristobalite grains and partial fibre/matrix debonding.
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Lawrence, C.W., Briggs, G.A.D., Scruby, C.B. et al. Acoustic microscopy of ceramic-fibre composites. J Mater Sci 28, 3635–3644 (1993). https://doi.org/10.1007/BF01159847
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DOI: https://doi.org/10.1007/BF01159847