La_(0.67)Mg_(0.33)Ni_(2.5)Cu_(0.5)贮氢合金磁热处理工艺的正交设计  

Optimization of process parameters about magnetic-heat treatment for La_(0.67)Mg_(0.33)Ni_(2.5)Cu_(0.5) alloys using the orthogonal array design

作　　者：刘素霞[1] 任雁秋[1] 张捷宇[2] 李谦[2] 周国冶[2,3] 吴广新[2] 

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]上海大学上海市现代冶金与材料制备重点实验室,上海200072 [3]北京科技大学物理化学系,北京100083

出　　处：《内蒙古科技大学学报》2009年第2期124-128,共5页Journal of Inner Mongolia University of Science and Technology

基　　金：长江学者和创新团队发展计划资助项目(IRT0739);教育部全国优秀博士学位论文作者专项基金资助项目(200746)

摘　　要：利用L9(34)正交表安排实验,考察磁热处理的温度、时间及磁感应强度对La0.67Mg0.33N i2.5Cu0.5合金的吸放氢反应热力学和动力学的影响,结合极差分析和方差分析研究了各因素对考核指标的显著性影响,并得到合金磁热处理的优化工艺:热处理温度850℃,处理时间1 h和磁感应强度4 T.在此条件下处理后的合金,吸放氢的质量分数分别为1.33%和1.14%,焓变为-59.69 kJ/mol,吸热峰顶所对应的温度为86.3℃,吸放氢特征时间(tξ=0.875)分别为11.2和108.7 s.结果表明,该合金与其它工艺下的样品相比,吸氢量最大,放氢后物相结构最稳定,吸热峰顶所对应的温度最低,吸放氢速度最快.The process parameters during heat treatment in a magnetic field for La0.67Mg0.33Ni2.5Cu0.5 hydrogen storage alloy were optimized by the orthogonal array design with four factors at three levels using statistical analysis.The four factors consist of the annealing temperature,time,magnetic induction density and an error term.The results of the range analysis and the variance analysis indicated the optimum scheme as follows：temperature=850 ℃;time=1 h;magnetic induction density=4 T.La0.67Mg0.33Cu0.5 alloy treated by the optimum scheme could absorb 1.33 % H and desorb l.14 %H in mass fraction.Its DSC measurement showed that the enthalpy was-59.69% kJ/mol and the endothermic peak was 83.6 ℃.The characteristic time（tξ=0.875） of hydriding and dehydriding reaction was 11.2 s and 108.7 s,respectively.Compared with all samples,it was known that sample No.4 has the largest hydrogen capacity,the minimum temperature of endothermic peak,the most stable structure and the excellent kinetic properties.

关 键 词：La0.67Mg0.33Ni2.5Cu0.5合金 L9(34)正交表 磁热处理 热力学 动力学 

分 类 号：TG139.7[一般工业技术—材料科学与工程]