Manufacture of near-net shape titanium alloy articles from metal powders by sintering with presence of atomic hydrogen
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United States of America Patent
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Dec 30, 2014
Grant Date -
Mar 8, 2012
app pub date -
Aug 8, 2011
filing date -
Jun 11, 2007
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Abstract
A process including:
- (a) forming a powder blend by mixing titanium powders,(b) consolidating the powder blend by compacting to provide a green compact,(c) heating the green compact thereby releasing absorbed water from the titanium powder,(d) forming β-phase titanium and releasing atomic hydrogen from the hydrogenated titanium by heating the green compact in an atmosphere of hydrogen emitted by the hydrogenated titanium,(e) reducing surface oxides on particles of the titanium powder with atomic hydrogen released by heating of the green compact,(f) diffusion-controlled chemical homogenizing of the green compact and densification of the green compact by heating followed by holding resulting in complete or partial dehydrogenation to form a cleaned and refined compact,(g) heating the cleaned and refined green compact in vacuum thereby sintering titanium to form a sintered dense compact, and(h) cooling the sintered dense compact to form a sintered near-net shaped article.
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