添加Mn和Ce对Ti0.27Cr0.33V0.4合金储氢性能的影响

采用XRD、SEM/EDS和PCT测试等方法,研究了添加Mn和Ce对于(Ti0.27Cr0.33V0.40)100-xMnxCey合金的组织结构和储氢性能的影响。结果表明:Mn的添加促进了富Ti相的析出,减小了合金bcc主相的晶格常数,平台压升高,残余氢量减小,当Mn含量为8at%时其有效储氢量达到最大值,在此基础上添加Ce,有效抑制了富Ti相的析出,促进了合金成分的均匀分布,增大了合金的晶格常数,改善了合金的平台性能,提高了合金的最大吸氢量和有效储氢量。

Effects of Mn and Ce Addition on Hydrogen Storage Properties of Ti0.27Cr0.33V0.4 Alloy

Effects of of Mn and Ce addition on hydrogen-storage microstructure and properties of (Ti0.27Cr0.33V0.4)100-xMnxCey alloy have been investigated by XRD, SEM/EDS and P-C isotherm measurements. The results show that the addition of Mn enhances the precipitation of Ti-rich phases. With the increase of Mn addition, the lattice parameters of bcc main phase are reduced, the plateau pressure of alloys is increased, and the amount of residual hydrogen in alloys is decreased. The maximum capacity of effective hydrogen storage is obtained at 8at% of Mn content in alloys. Based on this alloy, the addition of Ce inhibits the precipitation of Ti-rich phases and facilitates homogeneous distribution of composition in the bulks. With the increase of Ce addition, the lattice parameters of alloys are increased, plateau pressure of alloys is improved, and the maximum capacity and effective capacity of hydrogen storage are raised.