Morphological change and hydorogen absorption-desorption characterristics of hydorogen-absorbing alloy by meehanical alloying

利用氢化物生成焓与原子半径的关系设计了10种MH-Ni二次电池用合金，用高频熔炼炉制备了所设计的Abs系和AB_2系合金，并进行了热处理。用研钵将3种合金（AB_5和AB_2：C15、C14）粉碎至200目以下，用球磨机进行机械研磨。研究了这些合金粉末的晶体结构变化和吸附-脱附特性。此外，还通过球磨机从合金组成元素的金属粉末制备了合金。（1）铸造合金的特性所生产的合金大部分具有沿着设计的电化学特性。这一事实证明，我们的联盟设计方法的可靠性高（2）从球磨机容器中排出破碎的合金粉末的方法合金粉末样品接受氧化，当球磨机容器的盖子 ...更多信息 在空气中打开。为了防止这种氧化，在球磨容器中注入一定量的有机溶剂后取出样品，注入乙醇的样品的电化学性能最好。（3）机械研磨（MG）对合金粉末的影响本研究所用合金为MmNi_Co_Mn_Al_（0.3）_Fe_（AB_5-系）、Zr_Ti_（V_Ni_Mn_Cr_）2.1（AB_2，C15型）和Zr_Ti_（V_Ni_Mn_Co_）1.82（AB_2，C14型），MG处理时间为5 - 200（或425）h。<41><0.4><0.2><0.1><0.95><0.05><0.10><0.57><0.28><0.05><0.65><0.35><0.10><0.57><0.28><0.05>随着加工时间的延长，合金粉末逐渐转变为非晶态，到加工结束时，晶粒尺寸达到几个纳米级。P-C-T曲线上的最大氢含量随着MG处理时间的增加而降低，平衡氢压（平台中心附近）随着MG处理时间的增加而增加。另一方面，电化学容量随着MG处理时间的增加而降低。（4）具有10%镍粉的合金粉末的机械合金化包括10%镍粉的合金的放电容量比不含Ni粉的合金进一步略微增加更少

10 kinds of alloys for Ni-MH secondary battery were designed by using the relationship between enthalpy for hydride formation and atomic radius, Designed Abs system and AB_2 system alloys were produced by using high frequency fusion fumace, and these conducted the heat treatment afterwards. 3 kinds of alloys (AB_5 and AB_2 : C15, C14) were crushed under 200 meshes by a mortar, and these samples did the mechanical grinding by using ball mill. Change of crystal structure and absorption-desorption characteristics were examined on these alloy powders In addition, an alloy was also produced from metal powders of alloy constituent element by the ball mill.(1)Characteristics of cast alloys Most of produced alloys had electrochemical characteristics along the design. This fact has proven that the reliability of our ally-design method is high (2)Ejection method of crushed alloy powder from ball mill container Alloy powder sample receives the oxidation, when the cover of the ball mill container … More is opened in the air. In order to prevent this oxidation, the sample was taken out after some organic solvents were injected to the ball mill container, Electrochemical characteristics of the sample which injected ethanol were the best. (3)Effect of mechanical grinding(MG) for alloy powders The alloys used in this study were MmNi_<41> Co_<0.4> Mn_<0.2> Al_<0.3_ Fe_<0.1>(AB_5-system), Zr_<0.95> Ti_<0.05>(V_<0.10> Ni_<0.57> Mn_<0.28> Cr_<0.05>) 2.1 (AB_2, C15 type) and Zr_<0.65> Ti_<0.35> (V_<0.10> Ni_<0.57> Mn_<0.28> Co_<0.05>) 1.82(AB_2, C14-type), and MG processing was carried out for 5-200(or 425) hour. These alloy powder became amorphous state with the increase in processing time and the crystallite size became several nano-meter in the end of processing. The maximum hydrogen content in the P-C-T curve decreased with the increase in MG processing time and the equilibrium hydrogen pressure (near the center of the plateau) tended to increase with the increase in MG processing time. On the other hand, electrochemical capacities decreased with the increase in MG processing time. (4)Mechanical alloying of alloy powder with 10% nickel powder Discharge capacity of the alloy including the 10% nickel powder slightly increased further than the alloy without Ni powder Less