β-Ti基硬質焼結材料の開発 Development of Sintered β-titanium Base Hard Alloy
Ti-Mo alloys have difficulties in manufacturing by melting-casting process because of its heavy gravitational segregation.<BR>Sintered Ti-Mo and Ti-Mo-TiC alloys were developed by the powder metallurgical process, and their microstructures, mechanical properties and corrosion behaviors were investigated.<BR>Ti-30mass%Mo alloy was consisted of β-Ti phase, its corrosion resistance in 35%HCI solution was far better than that of pure titanium, this was thought to be caused by the spontaneously passivated film, in which molybdenum was enriched by preferential dissolution of titanium, suppressing the anodic reaction.<BR>Ti-Mo-(33 - 80) mass%TiC alloy had two phases of TiC<SUB>x</SUB> and β-Ti phases, and increasing the TiC content increased the hardness, and maximum hardness of HRC 66 was obtained in Ti-Mo-45mass%TiC alloy, but slightly decreased the transverse-rupture-strength. Its potentiodynamic curve revealed also same as that of Ti-30mass%Mo alloy. In conseqence of these results, this alloy was thought to have both wear resistance and corrosion resistance.
粉体および粉末冶金 44(3), 301-307, 1997-03-15
Japan Society of Powder and Powder Metallurgy