V-Ni合金制备及吸氘性能研究
Fabrication and Deuterium Absorption Performances of V-Ni Alloys
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摘要: 采用磁悬浮感应熔炼法制备了1组V100－xNix（x ＝0.5，1.0，2.0，4.1，8.3）合金。XRD和ICP-AES分析表明，所制备的合金均为bcc结构的固溶体，物相单一、成分均匀。在室温和1.0 MPa氘气压力下的合金吸氘性能测试结果表明：掺杂改性后的金属V活性明显改善，第1次活化均能快速大量吸氘，其中，x＝8.3的合金第1次吸氘即可完全活化，其余合金仅需1次吸放氘循环即已完全活化。Ni含量从0.5%（原子百分数，余同）增加到1.0%时，首次吸氘和完全活化后饱和吸氘量逐步提高；当Ni含量超过4.1%时，饱和吸氘量明显下降，仅为理论值的50%左右；x＝1.0的合金活化性能最为优良，首次活化可达到理论吸氘量的96.6%，完全活化后，吸氘速率和饱和吸氘量均高于其它样品。对活化除气后的样品进行结构分析观测到，x＝8.3的金属经多次吸放氘循环和高温处理后物相发生变化，影响吸氘性能。Abstract: A group of V100－xNix(x ＝0.5,1.0,2.0,4.1,8.3) alloys were fabricated by induction melting. The structures of alloys were characterized by XRD and ICP-AES. The result of the alloys for structure characters shows that all of the alloys are solid solution with bcc structures and single phases. At room temperature and 1.0 MPa deuterium pressure, the alloys deuterium absorption properties were test. As it turned out, doping a little of Ni could improve the properties of activation and kinetics of vanadium. The alloys absorb deuterium rapidly and largely at first activation. With the increase of Ni content from 0.5% (atom fraction) to 1.0%, the deuterium saturation capacity for both first-time activation and complete activation increases step by step, but when Ni content is over 4.1%, it decreases clearly only for 50% of ideal value. The alloys have the best performances with rapidly and largely deuterium absorption when Ni content is 1.0%. The samples structure was detected by XRD after activation and outgassing. The alloy phase is changed with manifold cycles and high temperature treatment when Ni content is 8.3%, which affects the activation properties. The results could provide the foundation of application for the materials.
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Keywords:
- vanadium ,
- activation properties ,
- doping ,
- deuterium saturation capacity
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