CERAMIC PREFORM OF HIGH MECHANICAL STRENGTH, ITS MANUFACTURE AND METAL-MATRIX COMPLEX OBTAINED FROM SAID CERAMIC PREFORM

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 a monocrystalline or polycrystalline structure, bound chemically by one or more nitridic ceramic phases. These preforms have a density of from 0.2 to 1.6 g/cm3 and a porosity of from 50 to 95%.