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Impact of the fcc/bcc phase transition on the homogeneity and behavior of PdCu membranes
Goldbach, Andreas; Yuan, Lixiang; Xu, Hengyong; 哥德巴赫
关键词Pdcu Membrane Preparation Temperature Cycling Permeation Hysteresis Structural Segregation Defect Formation
刊名SEPARATION AND PURIFICATION TECHNOLOGY
2010-05-28
ISSN1383-5866
DOI10.1016/j.seppur.2010.01.007
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
关键词[WOS]POROUS STAINLESS-STEEL ; COMPOSITE MEMBRANES ; CU MEMBRANES ; PERMEATION ; TRANSPORT ; H-2 ; SEGREGATION
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.
语种英语
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WOS记录号WOS:000278721700012
引用统计
被引频次:17[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/103655
专题中国科学院大连化学物理研究所
通讯作者哥德巴赫
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
推荐引用方式
GB/T 7714
Goldbach, Andreas,Yuan, Lixiang,Xu, Hengyong,et al. 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.
APA Goldbach, Andreas,Yuan, Lixiang,Xu, Hengyong,&哥德巴赫.(2010).Impact of the fcc/bcc phase transition on the homogeneity and behavior of PdCu membranes.SEPARATION AND PURIFICATION TECHNOLOGY,73(1),65-70.
MLA Goldbach, Andreas,et al."Impact of the fcc/bcc phase transition on the homogeneity and behavior of PdCu membranes".SEPARATION AND PURIFICATION TECHNOLOGY 73.1(2010):65-70.
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