Abstract
So as to develop an alloy having high electrical conductivity and high-temperature-strength used for such as the spot welding electrode material, reaction sintering of Cu-Ti-B-C alloy was investigated by heating the mixed powder compacts prepared from copper powder, titanium hydride powder and boron carbide powder(fine or coarse) at temperatures higher than the melting point of Cu. Cu-TiC-TiB2 three-phase alloy was obtained when the atomic ratio of Ti:B:C in the starting mixture was near 2:2:1. When fine B4C powder was used, a frame structure composed of fine granular TiC and TiB2 crystals was formed in the Cu matrix; on the other hand, when coarse B4C powder was used and reaction-sintered at 1373 K, network structure of whisker- or fibre-type TiB2 was formed in the Cu matrix.
