CERAMIC PREFORMS FOR METAL MATRIX COMPOSITES, A PROCESS FOR THEIR PREPARATION AND COMPOSITES OBTAINED FROM THESE PREFORMS

摘要

Preforms for metal matrix composites consisting of a ceramic material belonging to the class of the oxides, nitrides carbides, borides, oxynitrides and the like, prevailingly in an acicular form and having a monocrystalline or polycrystalline structure, having a density ranging from 0.2 to 1.6 g/cm3 and porosity ranging from 50 to 95%.