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题名: Impact of the fcc/bcc phase transition on the homogeneity and behavior of PdCu membranes
作者: Goldbach, Andreas1;  Yuan, Lixiang1;  Xu, Hengyong1
通讯作者: 哥德巴赫
关键词: PdCu membrane preparation ;  Temperature cycling ;  Permeation hysteresis ;  Structural segregation ;  Defect formation
刊名: SEPARATION AND PURIFICATION TECHNOLOGY
发表日期: 2010-05-28
DOI: 10.1016/j.seppur.2010.01.007
卷: 73, 期:1, 页:65-70
收录类别: SCI ;  ISTP
文章类型: Article
部门归属: 8
项目归属: 801
产权排名: 1;1
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: The Pd-Cu phase diagram is discontinuous in the immediate vicinity of the body centered cubic (bcc) Pd(47.3)Cu(52.7) alloy, which is a promising material for H(2) separation membranes. Hence PdCu/ceramic composite membranes have been prepared by sequential electroless plating of the metals to investigate the influence of concomitant face centered cubic (fcc) phases on the behavior of such membranes. Structural and compositional segregation was observed during cycling of a bcc Pd(48)Cu(52) membrane through the fcc/bcc miscibility gap between 723 and 873 K. Transient bcc and fcc phases with low Pd content also appeared in the initial formation stages of an fcc Pd(63)Cu(37) membrane during alloying of Pd and Cu layers at 723 and 773 K. Both phenomena could be sources of persistent stoichiometric heterogeneity in supported bcc PdCu membranes, which considerably reduces their H(2) permeability. An fcc/bcc Pd(46)Cu(54) mixed phase membrane withstood 30 temperature cycles between room temperature and 673 K well, although a slight increase of the leak flow was observed. The widening of the leaks is tentatively attributed to mechanical stress caused by the incommensurate lattice expansion of hydrogenated fcc and bcc PdCu grains. A formation mechanism for the frequently observed pinholes in bcc PdCu membranes is proposed based on the discrepancy between the hydrogen solubility in bcc and fcc PdCu alloys. As a consequence coexisting fcc phases could reduce the life time of bcc PdCu membranes in H(2) atmospheres. (C) 2010 Elsevier B.V. All rights reserved.
关键词[WOS]: POROUS STAINLESS-STEEL ;  COMPOSITE MEMBRANES ;  CU MEMBRANES ;  PERMEATION ;  TRANSPORT ;  H-2 ;  SEGREGATION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000278721700012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/103655
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Goldbach, Andreas,Yuan, Lixiang,Xu, Hengyong. Impact of the fcc/bcc phase transition on the homogeneity and behavior of PdCu membranes[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2010,73(1):65-70.
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