Method of producing a powder sintered titanium based alloys and titanium powder sintering

摘要

PURPOSE:To manufacture powder-sintered titanium having similar mechanical characteristics to those of forged titanium having the same chemical compsn. and having high sintering density by compacting titanium powder having a specified particle size distribution into a green compact and sintering this green compact in a vacuum heating furnace at less than the temp. where a liquid phase is formed. CONSTITUTION:Titanium powder (having about =99wt.% purity) is screened to prepare a titanium raw material for powder-sintered titanium in such a manner that the particles having the particle size distribution of 44 to 105mu powder size is defined to medium ones. The particles having the particle size distribution of =44mu to fine ones and the medium and fine particles are mixed so that the ratio of the midium particles will be regulated to 30 to 50wt.%. This titanium raw material is mixed with 0.5 to 10wt.% carbon powder (having about 0.1 to 10mu average particle size), is compacted under about 4 to 7tonf/cm2 compacting pressure into a green compact and is thereafter sintered in a vacuum heating furnace at less than the temp. where a liquid phase is formed. In this way, a sintered body having high sintering density equal to that of a forged part excellent in mechanical characteristics can be obtd.