Quick Search:       Advanced Search
罗林龄,叶小球,张光辉,桑革.Zr1-xCoNbx (x = 0-0.2)合金吸放氢性能及抗歧化机制研究[J].稀有金属材料与工程(英文),2021,50(1):172~178.[LUO Linling,YE Xiaoqiu,ZHANG Guanghui and SANG Ge.Study on the Improvement of Hydrogen Absorb/desorb Properties and Anti-disproportionation performance of Zr1-XCoNbx (x = 0-0.2) alloys[J].Rare Metal Materials and Engineering,2021,50(1):172~178.]
Study on the Improvement of Hydrogen Absorb/desorb Properties and Anti-disproportionation performance of Zr1-XCoNbx (x = 0-0.2) alloys
Download Pdf  View/Add Comment  Download reader
Received:January 19, 2020  
DOI:
Key words: ZrCo alloy  Nb substitution  hydrogen absord/desorb properties  anti-dispropotionation performance.
Foundation item:国家自然科学基金资助(项目号21573200,21601165)
Author NameAffiliation
LUO Linling,YE Xiaoqiu,ZHANG Guanghui and SANG Ge  
Hits: 93
Download times: 140
Abstract:
      Zr1-xCoNbx (x = 0, 0.05, 0.1, 0.15, 0.2) alloys were prepared via vacuum arc-melting method. The effects of substituting Zr with Nb on the structure, hydrogen absorb/desorb properties and anti-disproportionation performance of the afore-mentioned alloys were systematically investigated. The results showed that Zr1-xCoNbx (x = 0-0.2) alloys exhibited ZrCo and ZrCo2 phases, and their corresponding hydrides consisted of ZrCoH3 and ZrCo2 phase. As the Nb content was increased, the activation time decreased significantly from 6790 s for ZrCo to 380 s for Zr0.8CoNb0.2. The activation energy for hydrogenation decreased from 44.88 kJ mol-1 H2 for ZrCo to 32.73 kJ mol-1 H2 for Zr0.8CoNb0.2 alloy. DSC measurement results showed that the desorption temperature decreased from 597.15 K for ZrCo to 541.36 K for Zr0.8CoNb0.2 and the activation energy for dehydrogenation decreased from 100.55 kJ mol-1 H2 for ZrCo to 84.58 kJ mol-1 H2 for Zr0.8CoNb0.2 alloy, which was beneficial to the anti-disproportionation properties. Additionally, the extents of disproportionation of alloys after disproportionated at 798 K for 10 h decreased from 83.68% for ZrCo to 8.71% for Zr0.8CoNb0.2. The positive effect of Nb substitution on improving the anti-disproportionation propertis of ZrCo alloys was attributed to the reduction of hydrogen atoms in 8f2 and 8e sites, which decreases the driving force of the disproportionation reaction.