In order to obtain Ti-Mo alloy having high density and strength by sintering at a temperature as low as possible, the enhancing effects of the intermediate cold isostatic pressing (CIP) on these properties in MIM process were investigated.
A Ti-12Mo alloy, in which the β phase is stable, was selected as test material because of its high corrosion resistance and strength.
In this work, the debound compacts of Ti-12mass%Mo premixed powder were CIPed after the pre-sintering (heating at the temperature under 900°C).
It was shown that the intermediate CIP treatment was much effective in increasing density; i.e., the relative density of sintered compacts was risen more than 10% by this treatment. And the tensile strengths were also increased, because high density was available by sintering at the lower temperature where no severe grain growth occurred. It was also shown that the density and strength of Ti-12Mo compacts increased with decreasing the pre-sintering temperature.