Thermophysical properties and microstructure of short carbon fibre reinforced Cu-matrix composites made by electroless copper coating or powder metallurgical route respectively

摘要: C fibre reinforced Cu matrix composites have the interesting properties of Cu, i.e. thermal and electrical conductivities, but fibre, small CTE, dominate mechanical behaviour. As desired composite can be obtained by selecting amount type fibres, it is suitable for electronic applications such as special heat sinks. with high conducting short fibres are a promising research field. Short were made hot-pressing coated chopped into different lengths (60 /spl mu/m-2 mm). By using electroless coating-based production, good distribution in interfacial contact obtained. The length strongly influences properties. During hot pressing, take on preferred orientation plane perpendicular to pressing direction. Within this plane, random. volume content was varied 38-64 vol.% range. microstructures studied SEM optical microscopy. Measured conductivity CTE compared microstructural results from mathematical models. about 250-300 W/mK two dimensions 140 third dimension. tailored range 4-10 ppm/K changing content. relatively low density 4-6 g/cm/sup 3/ also important where weight reduction desired. produced powder metallurgical methods those fibres.