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,2021,50(1):172~178.[LUO Linling,YE Xiaoqiu,ZHANG Guanghui,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.]
Zr1-xCoNbx (x = 0-0.2)合金吸放氢性能及抗歧化机制研究
投稿时间:2020-01-19  修订日期:2020-05-05
中文关键词:  ZrCo  Nb掺杂  吸放氢性能  抗歧化性能
基金项目:国家自然科学基金资助(项目号21573200,21601165)
中文摘要:
      采用真空电弧熔炼法制备了Zr1-xCoNbx (x = 0,0.05,0.1,0.15,0.2)合金,研究了Nb掺杂对合金晶体结构、吸放氢及抗歧化性能的影响。XRD结果表明:Zr1-xCoNbx (x = 0-0.2)合金主相为ZrCo相,含有少量ZrCo2杂相;其氢化物为ZrCoH3和ZrCo2相。Nb掺杂极大地提高了合金吸氢动力学性能,ZrCo吸氢反应活化时间为7690 s,Zr0.8CoNb0.2缩短至380 s。ZrCo吸氢反应活化能为44.88 kJ mol-1 H2,Zr0.8CoNb0.2降低至32.73 kJ mol-1 H2,有利于吸氢反应动力学性能。DSC测量结果表明:ZrCo放氢温度为597.15 K,Zr0.8CoNb0.2降低至541.36 K,放氢温度降低,有利于抗歧化性能。ZrCo合金放氢反应活化能为100.55 kJ mol-1 H2,Zr0.8CoNb0.2降低至84.58 kJ mol-1 H2。合金歧化程度随着Nb掺杂量增加而降低,798 K保温10 h,ZrCo歧化83.68%,Zr0.8CoNb0.2仅歧化8.71%,Nb掺杂降低8f2和8e位置氢原子数量,减小岐化反应驱动力。
Study on the Improvement of Hydrogen Absorb/desorb Properties and Anti-disproportionation performance of Zr1-XCoNbx (x = 0-0.2) alloys
英文关键词:ZrCo alloy  Nb substitution  hydrogen absord/desorb properties  anti-dispropotionation performance.
英文摘要:
      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.
作者单位E-mail
罗林龄 表面物理与化学重点实验室 loulinling@163.com 
叶小球 表面物理与化学重点实验室  
张光辉 中国工程物理研究院材料研究所  
桑革 中国工程物理研究院材料研究所  
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