MANUFACTURE OF NEAR-NET SHAPE TITANIUM ALLOY ARTICLES FROM METAL POWDERS BY SINTERING WITH PRESENCE OF ATOMIC HYDROGEN

摘要

Disclosed herein is a process that includes; (a) providing a powder blend comprising (1) one or more hydrogenaled titanium powders containing around 0,2 to around 3.4 weight % of hydrogen, and (2) one or more master alloys, comprising Al, V} or a combination thereof, (b) consolidating the powder blend by compacting the powder blend to provide a green compact, (e) heating the green compact to a temperature ranging from around 400^0 to around 90CFC, thereby releasing the majority or ail of the hydrogen from the hydrogenated tiianium} and partially sintering the green compact without folly sintering it, to obtain a partially sintered article having a density of about 60% to about 85% of theoretical density, (d) sizing the partially sintered article at a temperature at or around room temperature to obtain an sized article having a density of about 80% to about 95% of theoretical density, (e) heating the sized article in vacuum thereby sintering the article to form a sintered dense compact having a density of 99% of theoretical density or higher.