Microstructures and oxygen reduction of recycled TiH2 powders during sintering

被引：6

作者：

Jang, Jin Man ^{[1
]}

Lee, Wonsik ^{[1
]}

Ko, Se-Hyun ^{[1
]}

Kim, Il-Ho ^{[1
]}

Son, Sung Ho ^{[2
]}

Jung, Do Won ^{[3
]}

机构：

[1] Korea Inst Ind Technol, Adv Mat Div, Cheonan 330825, South Korea

[2] Korea Inst Ind Technol, Prod Technol Div, Incheon 406840, South Korea

[3] DOES Ltd, Seoul 157841, South Korea

来源：

MULTI-FUNCTIONAL MATERIALS AND STRUCTURES, PTS 1 AND 2 | 2008年 / 47-50卷

关键词：

titanium chip; recycling; titanium dihydride; powder metallurgy; microstructure; hydrogen;

D O I：

10.4028/www.scientific.net/AMR.47-50.995

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Using commercial Ti powders and recycled TiH2 powders made from titanium turning chips, the effects of hydrogen on microstructures and oxygen reduction were investigated. Each powder was hot-pressed at 750 degrees C and 1100 degrees C, which are below and above beta-transition temperature (880 degrees C), respectively. The TiH2 and Ti samples of sintered at 1100 degrees C showed equiaxed alpha phase. However, TiH2 sample sintered at 750 degrees C consist of primary a phase, secondary a phase and titanium hydride (TiH2), though Ti sample represented single a phase. The formation of complex microstructure in TiH2 sample sintered at 750 degrees C is due to hydrogen remained after sintering. The oxygen contents after sintering in TiH2 samples were relatively lower than Ti samples, although those before sintering were higher than Ti. This result can be explained that hydrogen gas generated from dehydrogenation of TiH2 leads to the reduction of oxygen contents and protection of re-oxidation during sintering.

引用

页码：995 / +

页数：2

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