Y掺杂的V基固溶体膜的结构和氢渗透性能  

Structure and hydrogen permeability of V solid solution membrane with yttrium doping

作　　者：陆永鑫 王凤[1] 龙乾新 杜勇[3] 张艳丽[1] 李家丞 吴晨曦 王仲民 LU Yong-xin;WANG Feng;LONG Qian-xin;DU Yong;ZHANG Yan-li;LI Jia-cheng;WU Chen-xi;WANG Zhong-min(School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Guangxi Academy of Sciences,Nanning 530000,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]桂林电子科技大学材料科学与工程学院,桂林541004 [2]广西科学院,南宁530000 [3]中南大学粉末冶金研究院,长沙410083

出　　处：《中国有色金属学报》2023年第7期2222-2233,共12页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51961010,51861006);广西科技计划资助项目(GuiKeAB182810103);广西自然科学基金资助项目(2022GXNSFAA035587);广西信息材料重点实验室资助项目(2011028-Z)。

摘　　要：V基固溶体合金具有较高的氢溶解度和氢渗透速率,但氢分离应用存在氢脆和高温内扩散问题。本研究制备了V_(92−x)Fe_(8)Y_(x)、V_(92−x)F_(e)4Pd_(4)Y_(x)(x=0,0.2)合金,探讨Y掺杂(0.2%)对V基固溶体合金结构和氢渗透性能的影响。结果表明:Y掺杂的V基固溶体偏析出第二相,V_(91.8)Fe_(8)Y_(0.2)合金偏析出富Y的Y-V化合物,V_(91.8)Fe_(4)Pd_(4)Y_(0.2)偏析出富Pd的Pd-Y-V化合物相。Y掺杂降低了合金的氢溶解度,提高了抗氢脆性能。V_(91.8)Fe_(4)Pd_(4)Y_(0.2)膜片氢渗透系数为5.93×10^(−8)mol∙m^(−1)∙s^(−1)∙Pa^(−0.5)(723 K),大约是纯Pd膜氢渗透系数的4倍。高温氢渗透持久性测试后(723 K,10 h),V_(92)Fe_(8)和V_(92)Fe_(4)Pd_(4)膜片氢通量均降到0,V91.8Fe4Pd4Y0.2膜片氢通量保持为8.28×10^(−6)mol∙m^(−1)∙s^(−1)。结构分析表明,微量Y掺杂(0.2%)在一定程度上能抑制渗氢过程中Pd膜与V基底互扩散现象,进而改善高温下膜片氢渗透稳定性。V solid solution alloy shows high hydrogen solubility and hydrogen permeation rate,but hydrogen embrittlement and high temperature internal diffusion problem exist in hydrogen separation application.In this experiment,hydrogen separation membranes V_(92−x)Fe_(8)Y_(x),V_(92−x)Fe_(4)Pd_(4)Y_(x)(x=0,0.2)were prepared,and the effect of adding 0.2%yttrium on the microstructure and hydrogen permeation coefficient(Φ)of solid solution alloys were studied.The results show that the second-phase compound segregates from the single phase solid solution with yttrium doping,the Y-rich Y-V compounds are segregated in the V_(91.8)Fe_(8)Y_(0.2)alloy and the Pd-rich Pd-Y-V compounds are segregated in V_(91.8)Fe_(4)Pd_(4)Y_(0.2)alloy.The doping of yttrium into the solid solution can reduce the hydrogen solubility of the alloy.Secondly,it is beneficial to improve the hydrogen embrittlement resistance.The hydrogen permeability coefficient of V_(91.8)Fe_(4)Pd_(4)Y_(0.2)membrane is 5.93×10^(−8)mol∙m^(−1)∙s^(−1)∙Pa^(−0.5)(723 K)for 10 h,which is about 4 times that of pure Pd membrane.In the high-temperature hydrogen permeation persistence test at 723 K,the hydrogen flux of V_(92)Fe_(8)and V_(92)Fe_(4)Pd_(4)membranes decreases to 0 and the hydrogen flux of V_(91.8)Fe_(4)Pd_(4)Y_(0.2)membrane is 8.28×10^(−6)mol∙m^(−1)∙s^(−1).The structural analysis confirms that trace yttrium(0.2%)can inhibit the mutual diffusion between Pd and V during hydrogen permeation to a certain extent,and enhance the hydrogen permeation stability of the membrane at high temperature.

关 键 词：V基固溶体 Y掺杂 偏析相 互扩散 氢渗透系数 

分 类 号：TG139.7[一般工业技术—材料科学与工程]