PREPARATION OF METAL-MATRIX COMPOSITE MATERIALS USING CERAMIC PARTICLES WITH MODIFIED SURFACES

摘要

A composite material is prepared by furnishing a mass of ceramic particles, such as aluminum oxide or spinel particles, and contacting a source of magnesium or other passivating metal with the mass of ceramic particles. Magnesium is deposited onto the surfaces of the particles in the absence of added oxygen and nitrogen. A source of aluminum or other matrix metal is infiltrated into the mass of ceramic particles to form an aluminum (or other metal)-containing composite material. This composite material may be further dispersed into a second source of aluminum or other matrix metal to form a composite material of a lower volume fraction of particles.