高性能銅系焼結部品用原料粉末の開発

抄録

Two kinds of raw material powders for high-performance copper base PM parts were developed, one of which was an aluminum bronze powder and the other one was a nickel bronze power. Regarding the aluminum bronze powder, aluminum-calcium fluoride and phosphorus were added as the sintering acceleration additives, and it was made certain that the aluminum bronze powder with these sintering acceleration additives was successfully sinterable in the conventional sintering atmosphere, such as with [H₂+N₂] mixed gas. This powder is very suitable as the raw material powder for copper base PM parts having high corrosion and wear resistance. On the other hand, with respect to the nickel bronze powder, the powder of the Cu-Ni-Sn system was investigated, and it was revealed that the sintered specimen which was made by sintering the alloyed powder of this ternary system, followed by air-cooling and an aging treatment, had a very fine modulated structure and showed a much higher radial crushing strength of more than 1200 MPa. This powder is very suitable as the raw material powder for copper base PM parts having high strength and high corrosion resistance.