Thermodynamic Destabilization of Ti-O Solid Solution by H and Deoxygenation of Ti Using Mg.
Reactive metals including Ti, Zr, Hf, and V, among others, have a strong chemical affinity to oxygen, which makes them difficult to produce and costly to use. It is especially challenging to produce pure or metal alloy powders of these elements when extremely low oxygen content is required, because...
| Publicado en: | Journal of the American Chemical Society Vol. 138; no. 22; pp. 6916 - 6920 |
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| Autores principales: | , , , , , , |
| Formato: | Artículo |
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American Chemical Society
6/8/2016
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=116286854&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 116286854 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 6/8/2016 vid: 138 iid: 22 pid: 997 pub: American Chemical Society artinfo: ui: 116286854 10.1021/jacs.6b00845 ppf: 6916 ppct: 4 formats: tig: atl: Thermodynamic Destabilization of Ti-O Solid Solution by H and Deoxygenation of Ti Using Mg. aug: au: Ying Zhang Zhigang Zak Fang Pei Sun Tuoyang Zhang Yang Xia Chengshang Zhou Zhe Huang affil: Department of Metallurgical Engineering, University of Utah, Salt Lake City, Utah 84112, United States Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China su: Deoxygenation Alloys Chemical reactions Solid solutions Solidification Crystallization Manufacturing industries sug: subj: Deoxygenation Alloys Chemical reactions Solid solutions Solidification Crystallization Manufacturing industries ab: Reactive metals including Ti, Zr, Hf, and V, among others, have a strong chemical affinity to oxygen, which makes them difficult to produce and costly to use. It is especially challenging to produce pure or metal alloy powders of these elements when extremely low oxygen content is required, because they have high solubility for oxygen, and the solid solution of these metals with oxygen is often more stable thermodynamically than their oxides. We report a novel thermochemical approach to destabilize Ti(O) solid solutions using hydrogen, thus enabling deoxygenation of Ti powder using Mg, which has not been possible before because of the thermodynamic stability of Ti(O) solid solutions relative to MgO. The work on Ti serves as an example for other reactive metals. Both analytical modeling and experimental results show that hydrogen can indeed increase the oxygen potential of Ti-O solid solution alloys; in other words, the stability of Ti-O solid solutions is effectively decreased, thus increasing the thermodynamic driving force for Mg to react with oxygen in Ti. Because hydrogen can be easily removed from Ti by a simple heat treatment, it is used only as a temporary alloying element to destabilize the Ti-O systems. The thermodynamic approach described here is a breakthrough and is applicable to a range of different materials. This work is expected to provide an enabling solution to overcome one of the key scientific and technological hurdles to the additive manufacturing of metals, which is emerging rapidly as the future of the manufacturing industry. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2016 holdings: @attributes: islocal: N |
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