抄録
Sintering of Cu-8mass%Ti-4mass%B alloy powder prepared by mechanical alloying was carried out at temperature range of 673K to 1173K for various times. Changes of structure and mechanical strength of the sintered powder-compact with the sintering process were investigated by using of X-ray diffraction analysis, electron microscope, Vickers hardness test and 3-points-bending test. Hardness of the compact sintered at from 673K to 873K increases with the sintering time, but pore in the compact is not changed after the long sintering time. On the other hand, when the sintering was carried out at high temperature for short time, the hardness of the compact decreases and then reaches to constant value, but the density increases. Fracture strength of the sintered compact increases, and formation of the titanium diborid becomes more frequent with increasing of the sintering temperature. It is observed that the copper-rich phase forms at contact region between the particles in the compact sintered at high temperature, and it brings on the high fracture strength.
