【摘要】 为改善Ti(Cr-Mn)2AB2型合金的储氢性能,采用A侧过化学计量和过渡金属部分替代Mn进行多元合金化,系统研究了Tix(Cr-Mn-M)2(x=1.0,1.1;M=V、Fe、Ni、Cu)合金的储氢性能。研究结果表明,V、Fe、Ni、Cu部分替代Mn进行多元合金化后,合金主相仍保持C14(MgZn2)型Laves相,合金晶胞体积增大。合金化元素部分替代Mn后合金的活化性能得到明显改善,合金吸放氢量增大,吸放氢压力滞后减小。除Fe使合金放氢平台压力有所升高外,其余合金化元素均使合金的吸放氢平衡压力有不同程度的降低,这是由于合金的晶胞体积增大所致。在所形成的合金中,以Ti1.1Cr1.2Mn0.5Cu0.3的综合性能最好,其室温下吸放氢量分别达到1.95%和1.72%(质量分数)。采用该合金与自制的轻质高压储氢容器(工作压力为40MPa)复合组成金属氢化物复合式高压储氢器,对其储氢密度的计算结果表明,当储氢合金的填充量(体积分数)达到0.20时,该复合式储氢器总的体积储氢密度将提高57%。更多还原

【Abstract】 In order to improve the hydrogen storage properties of Ti(Cr-Mn)2 alloys,over stoichiometry of A side and partial substitution of Mn by transition metals were adopted,and the hydrogen storage properties of Tix(Cr-Mn-M)2(x=1.0,1.1;M=V,Fe,Ni,Cu) alloys were investigated.The experimental results showed that the alloys after partial substitution of Mn by V,Fe,Ni,Cu remain C14 laves phase structure,but their cell volume increase.After alloying with V,Fe,Ni and Cu,the activation properties of the alloys are improved remarkably,the hydrogen storage capacities increase,and the hydriding/dehydriding pressure hysteresis decrease.Alloying with Fe leads to increase of dehydriding pressure,while alloying with V,Ni and Cu leads to decrease of hydriding/dehydriding pressure,this is due to the increase of cell volume.The hydrogen Absorption and desorption capacities of Ti1.1Cr1.2Mn0.5Cu0.3 reach 1.95wt% and 1.72wt%,respectively.Using this alloy a metal hydride hybrid high-pressure hydrogen storage vessel with working pressure of 40 MPa was composed and its hydrogen storage density was calculated.When the volume fraction of hydrogen storage alloy reaches 0.20,the volumetric hydrogen storage density of this hybrid hydrogen storage vessel by more increases than 57%.更多还原