氢气渗透Nb基合金的设计及特性表征  

Preparation and Characterization of Hydrogen Permeable Nb-Based Alloys

作　　者：罗伟民[1] 闫常峰[1] 石川和宏 青木清 

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]日本北见工业大学,日本北海道0908507

出　　处：《稀有金属材料与工程》2010年第6期1045-1049,共5页Rare Metal Materials and Engineering

基　　金：广东省自然科学基金资助项目(8451007006000933);广东省关键领域重点突破科技计划项目(20070109-1 & 2007A010701001);广州市科技计划项目(2006J1-C0421)

摘　　要：在Nb40Ti30Ni30合金的初生相(Nb,Ti)和共晶相连线上制作Nb-Ti-Ni合金。研究表明,上述直线上的合金由初生相和共晶相构成,氢渗透度Φ随Nb浓度和初生相(Nb,Ti)体积分数的增大而升高,氢渗透合金的Nb浓度扩展至68mol%。Nb68Ti17Ni15合金由74%(体积分数)的初生相(Nb,Ti)和26%(体积分数)的共晶相{(Nb,Ti)+TiNi}组成,氢渗透度最大Φ673K达到4.91×10-8molH2m-1s-1Pa-0.5,是Nb40Ti30Ni30合金的氢渗透度Φ673K的2.5倍,纯钯金的氢渗透度Φ673K的3.5倍。Pd-Ag alloy shows high hydrogen permeability and excellent resistance to hydrogen embrittlement, so it is used to separate the products of methane steam reforming to achieve high purity hydrogen. However, Pd is very expensive; therefore it is eagerly desired to develop no-Pd based alloys with low cost and high hydrogen permeation performance. In order to find out Nb-Ti-Ni alloy with higher hydrogen permeability, the Nb-Ti-Ni alloys located at the straight line connecting the primary （Nb, Ti） of Nb40Ti30Ni30 and the eutectic {（Nb,Ti）＋TiNi} phases in the Nb-Ti-Ni trinary diagram were prepared. Results show that the alloys located at the straight line consists of the primary （Nb, Ti） and the eutectic {（Nb,Ti）＋TiNi} phases, and their hydrogen permeability increase with increasing of Nb content or volume fraction of the primary （Nb,Ti）. Moreover, the Nb content increases to 68 mol%. The Nb68Ti17Ni15 alloy, consisting of 74 vol% primary （Nb, Ti） phase and 26 vol% eutectic {（Nb,Ti）＋TiNi} phase, show the highest Φ673K of 4.91′10-8 mol H2m-1s-1Pa-0.5, which is 2.5 times as high as that of the Nb40Ti30Ni30, and 3.5 times as high as that of the pure Pd

关 键 词：氢渗透合金 Nb基合金 氢渗透度 微观组织 

分 类 号：TG131[一般工业技术—材料科学与工程]