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研究了添加Mn和Co对V_(80)Ti_(8-x-y)Cr_(12)Mn_xCo_y(x=0,1,2,3;y=0,0.1,0.2,0.4,0.8,1.0)合金组织结构和储氢性能的影响。结果表明:所有的合金均为bcc单相结构。Mn的添加减小了合金bcc相的晶格常数,平台压升高,平台斜率因子减小,残余氢量减少,然而合金的吸放氢量均有所降低。在V_(80)Ti_7Cr_(12)Mn_1基础上添加Co,随着Co含量的增加,合金的平台压升高,斜率因子减小,吸氢量和有效放氢量均先增加后降低,但有效放氢量均能保持在2.2%以上。当Co含量为0.2at%时,得到合金V_(80)Ti_(6.8)Cr_(12)Mn_1Co_(0.2)在273K吸氢量达到最大为3.81%(质量分数),313K有效放氢量为2.45%,平台压为0.68Mpa。对V_(80)Ti_(6.8)Cr_(12)Mn_1Co_(0.2)合金进行短期循环性能测试得到合金具有良好的循环稳定性,随着循环次数的增加合金的吸氢量变化缓慢,15次循环后的有效放氢量为2.38%。
The effects of addition of Mn and Co on the microstructures of V 80 Ti 8-xy Cr 12 Mn x Co y (x = 0,1,2,3; y = 0,0.1,0.2,0.4,0.8,1.0) And hydrogen storage performance. The results show that all alloys are bcc single phase structure. The addition of Mn reduced the lattice constant of the alloy bcc phase. The plateau pressure was increased, the slope factor of the platform was decreased and the residual hydrogen content was decreased. However, the hydrogen absorption and desorption capacity of the alloy decreased. With the addition of Co to V_ (80) Ti_7Cr_ (12) Mn_1, with the increase of Co content, the plateau pressure increases, the slope factor decreases, the hydrogen absorption capacity and the effective hydrogen release capacity both increase and then decrease, Hydrogen release capacity can be maintained at 2.2% or more. When the content of Co is 0.2at%, the hydrogen uptake capacity of V_ (80) Ti_ (6.8) Cr_ (12) Mn_1Co_ (0.2) reaches the maximum of 3.81% at 273K, the effective hydrogen desorption capacity of 313K is 2.45% , Platform pressure is 0.68Mpa. The cycle properties of V_ (80) Ti_ (6.8) Cr_ (12) Mn_1Co_ (0.2) alloy were investigated. The cycle stability of the alloy was investigated. The hydrogen evolution of the alloy changed slowly with the increase of the number of cycles. The effective amount of hydrogen release is 2.38%.