Ceramic matrix composites (CMCs) are non-brittle, tough and damage tolerant materials as compared with monolithic ceramics. The non-brittle dissipative behaviour of CMCs results from the achievement, during their processing, of a fibre-matrix bond sufficiently weak to allow, during loading, multi-cracking of the matrix to develop without breaking the fibre. This unique feature, together with the good high temperature environmental behaviour of these materials resulting from the nature of the matrix, either silicon carbide or oxide, accounts for their rapid development during the last two decades. Therefore, the applications of these materials, restricted in a first step to military use, are now entering civil programmes such as hypersonic vehicles or turbojet engines.
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