Ceramic preforms having high mechanical strength, a process for their preparation and metal matrix composites obtained from said ceramic preforms

摘要

Preforms for metal matrix composites consisting of ceramic material belonging to the class of oxides, nitrides, carbides, borides, oxynitrides and the like, prevailingly in an acicular form and having monocrystalline or polycrystalline structure, having a density ranging from 0.2 to 1.6 g/cm.sup.3 and porosity ranging from 50 to 95%.