Thermomechanical Mismatch in Ceramic‐Fiber‐Reinforced Glass‐Ceramic Composites

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Abstract
The thermomechanical relationship between mullite and a lithium aluminosilicate (LAS) glass‐ceramic has been studied by a technique of bimaterial dilatometry. The viscoelastic behavior of LAS was found to result in a temperature Trvsl below the glass‐transformation temperature Tg at which the interfacial stresses between the materials undergo a reversal in sign. The effect of Trvsl on the high‐temperature mechanical properties of mullite or SiC fiber‐reinforced glass‐ceramic composites is discussed. It is suggested that fiber clamping by the matrix at temperatures between Trvsl and Tg contributes to the brittle, high‐temperature behavior of such composites.