Nb-Zr-Co hydrogen separation material with continuous hydrogen permeation phase and preparation method and application thereof

Abstract

The invention discloses a Nb-Zr-Co hydrogen separation material with a continuous hydrogen permeation phase. Nb, Zr, and Co are regarded as raw materials, and the hydrogen separation material is prepared by a directional solidification technology after the raw materials are smelted into a mother alloy; an alloy microstructure is composed of a zirconium-containing niobium-based solid solution and azirconium-cobalt metallic compound, and a constituent phase of the alloy microstructure is a whole eutectic phase and is composed of a primary niobium phase and a zirconium-cobalt inter-metallic phase of a body centered cubic structure, wherein the primary niobium phase is the hydrogen permeation phase, and the zirconium-cobalt inter-metallic phase is an anti-hydrogen embrittlement phase; and thediameter of the hydrogen permeation phase is 0.5 to 3 nm, the growth direction of the hydrogen permeation phase grows regularly and continuously along a directional solidification drawing direction,and the hydrogen permeation phase is surrounded by the anti-hydrogen embrittlement phase. A preparation method of the Nb-Zr-Co hydrogen separation material includes the following steps of 1) smeltingof the mother alloy, and 2) directional solidification of the mother alloy. According to application of the hydrogen permeation material, the hydrogen permeation ratio is 3.5x10<-8>-4x10<-8> mol H2 m<-1> s<-1> Pa<-1 / 2>, the durable time of the anti-hydrogen embrittlement performance is more than 10.3 h, and the Nb-Zr-Co hydrogen separation material has the advantages of regular and continuous growth of the hydrogen permeation phase, short hydrogen permeation channel and strong anti-hydrogen embrittlement capacity.

Description

technical field [0001] The invention relates to the field of hydrogen purification, in particular to a Nb-Zr-Co hydrogen separation material with a continuous hydrogen permeation phase and its preparation method and application. Background technique [0002] At present, major issues such as environmental pollution and greenhouse effect brought by fossil energy have attracted much attention. As a clean and efficient secondary energy carrier, hydrogen has many advantages such as cleanliness, no pollution, high efficiency, and various application forms. Therefore, hydrogen energy has been widely recognized as the energy carrier with the most development potential in the 21st century. At present, most hydrogen is produced by steam reforming, and there are many impurities in the raw gas, such as CO, CO 2 、H 2 O and H 2 O (gas), which needs to be separated and purified. In the above process, the membrane separation method is currently the most effective hydrogen purification t...

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Problems solved by technology

[0006] In response to the above problems, Lin Junpin et al. (Patent Publication No.: CN101984321A "Preparation Method for a Crucible Model for Directional Solidification of Titanium-Alloys") developed an auxiliary formwork technology, and used 200 mesh in the preparation method of the crucible model for directional solidification Y 2 o 3 The crucible is sintered as a raw material. This method avoids the reaction between the sample and the crucible to a certain extent, but its porosity has not been significantly improved, and there is still a risk of contamination by highly active elements.

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