【摘要】 为改善Ti-V基固溶体型储氢合金的电化学性能,使用少量的Zr部分取代Ti19.5V40Mn16.2Cr9.8Ni14.5合金中的Ti,并采用XRD,SEM以及PCT等测试手段研究替代前后合金微观结构和储氢性能的变化情况。通过XRD和SEM分析表明,(Ti1-xZrx)19.5V40Mn16.2Cr9.8Ni14.5(x=0,0.1,0.15,0.2,0.25,0.3)合金均是由Ti-V基BCC相和C14 Laves相组成。但Zr的部分替代明显增加了C14Laves相的含量,并使Ti-V基BCC相在减少的同时由树枝状变成了被C14Laves相包围的岛状。PCT曲线显示:随着Zr替代量的增加。合金的吸放氢平台不断下降,而合金的吸放氢量先有所增加后又逐渐减小。这说明适量提高C14 Laves相的含量对增加Ti-V基固溶体型储氢合金的吸放氢能力有一定的促进作用。更多还原

【Abstract】 To improve the electrochemical performance of Ti-V-based hydrogen storage alloy of solid solution type, partial Ti in Ti19.5V40Mn16.2Cr9.8Ni14.5 alloy has been substituted by Zr. It’s found by XRD and SEM that all the (Ti1-xZrx)19.5V40Mn16.2Cr9.8Ni14.5 (x=0, 0.1,0.15,0.2,0.25,0.3) alloys consist of Ti-V-based BCC phase and C14 Laves phase. With increase of Zr substitution, the content of C14 Laves phase increases and the Ti-V-based BCC phase turns from dendritic structure to an island structure enveloped by C14 Laves phase. The PCT curves indicate that the equilibrium pressure for hydrogen absorption/desorption depresses steadily due to the expansion of cell volume of C14 Laves phase and the hydrogen absorption/desorption capacity increases firstly and then decreases due to the increase of the content of C14 Laves phase with x from 0 to 0.3.更多还原