抄録
Die Compactibility and strength of green compact were investigated for low oxygen titanium powder produced by means of induction drip gas atomization, and a technic to improve the green strength and repressing compactibility of the pre-sintered compacts were also examined.
Although the atomized titanium powder has good die compactibility owing to its high apparent density (55% in relative density), the green strength is not so high because the powder is spherical in shape. Therefore, the compacts pressed at low pressure have to be handled carefully. Addition of hydrided-dehydrided titanium powder (HDH powder) is quite effective in strengthening the green compacts, because of increase in contact area at powder/powder interface and an anchor effect by attachment of the HDH powder among large atomized powders.
Repressing compactibility of pre-sintered compacts produced from the mixture of the atomized titanium and HDH powders is also excellent. For example, the porosity decreases to less than 6.5% through 785MPa repressing process. High density titanium parts with correctly controlled dimension, therefore, can be producted by repress-resinter P/M process.
