Development of Nitrided Boron Reinforced Metal Matrix Composites

Abstract

The development of a submicron boron nitride coating has sub stantially improved the stability of boron filaments in metallic matrices. It is now possible to think in terms of continuous casting techniques for the fabrication of low melting metal matrix composites like aluminum/ boron. The boron nitride coating also contributes to the formation of void-free nickel/boron composites by electroforming processes, and reaction-free nickel/boron and titanium/boron composites by diffusion bonding methods. Mechanical properties of 60-70 vol. % nitrided boron/6061 aluminum composites prepared by continuous liquid infiltration are discussed. The effects of heat treatment on these com posite strengths are also considered.