Affiliation:
1. Korea Institute of Industrial Technology
Abstract
In present work, manufacturing technologies of titanium hydride powder were studied for
recycling of titanium tuning chip and for this, attrition ball milling was carried out under H2
pressure of 0.5 MPa. Ti chips were completely transformed into TiH2 within several hundred
seconds that is very short time comparing to that in the previous report. Dehydrogenation process
TiH2 powders is consist of two reactions: one is reaction of TiH2 to TiHx and the other
decomposition of TiHx to Ti and H2. The former reaction shows relatively low activation energy
ranged from about 100 KJ/mol to 250 KJ/mol and it is suggested that the reaction is caused by
introduction of defects due to milling. In case of TiH2 powders that hardly contains defects,
decomposition of TiH2 to Ti and H2 occurs directly without the reaction of TiH2 to TiHx and
activation energy is very large as much as 929 KJ/mol.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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