Molding and Casting of Metal/Polymer Composites

Abstract

Metals in particulate forms are blended with liquid polymers or solid particles of polymer, as described in the previous chapter. Applications of these composites as molding, casting, or adhesive compounds are numerous in the electrical and electronic industries and as maintenance materials. In the majority of these examples, the principal matrix is the polymer which provides continuity throughout the structure. This suggests that qualities such as adhesion, chemical resistance, coloration, reduced heat transfer, and electrical insulation are the primary objectives. The presence of metal particulates contributes to higher densities, improved heat stability within the thermal limits of the accompanying polymer, barriers to high frequency radiation, and the availability of magnetic properties. The contributions of metal particulates become more formidable when they are introduced as chopped fibers or pellets and hence make possible higher moduli of elasticity and better impact strength than is possible with unreinforced polymers. Impressive structural advantages accrue when sheets, rods, and continuous metal fibers, and metal oxide, or metal carbide fibers are part of the composite structure. The structural aspects of these combinations are cited in later chapters.