透氧膜法直接制备LaNi_4Al合金的研究  

Direct preparation of LaNi_4Al hydrogen storage alloy by SOM process

作　　者：赵炳建[1] 司新国[1] 袁辉[1] 鲁雄刚 

机构地区：[1]唐山钢铁集团有限责任公司,河北唐山063016 [2]上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《粉末冶金工业》2015年第6期25-29,共5页Powder Metallurgy Industry

基　　金：国家重点基础研究发展计划(2007CB613606);上海大学研究生创新基金资助项目(SHUCX101052)

摘　　要：采用固体透氧膜(SOM)法电解La_2O_3-NiO-Al_2O_3烧结片,直接制备储氢合金LaNi4Al。该工艺用只允许氧离子通过的固体透氧膜隔开阴极和阳极,可采用较高的电解电压(3.8V)以获取更高的电解速率。采用SEM和XRD分析了烧结阴极片形貌、组成以及在熔盐中浸蚀后的变化,通过电解中间产物相组成分析了反应机理。结果表明:SOM法由La_2O_3-NiO-Al_2O_3直接制备LaNi4Al是可行的;La_2O_3-NiO-Al_2O_3阴极片1150℃烧结后的组成为LaAlO_3、NiO;烧结片电解机理为LaAlO_3脱氧生成LaOCl、Al,NiO脱氧反应生成Ni,随后LaOCl、Al、Ni反应生成LaNi4Al;反应的电流效率为92.7%,能耗3.55kW·h/kg。工艺流程短、效率高,有良好的应用前景。A new process of solid oxygen-ion membrane process was used for the production of LaNi4Al alloy di- rectly from La2O3-NiO-Al2O3 sintered pellet. Cathode and anode was separated from a yttria-stabilized zirconia tube in which only oxygen-ion was permeated so the voltage was as high as 3.8 V to achieve high deoxidization rate. The morphology, phase composition, corrosion of the sintered pellets in the molten salt were examined, the re- duction mechanism was investigated by analyzing the phase constitution of the intermediate product. The results show that direct electrochemical reduction La2O3-NiO-Al2O3 sintered pellet to the LaNi4Al alloy by SOM process is feasible. At sintering temperature of 1 150 ℃, sintered pellet starts from LaA103 reacts with CaCh into LaOCl and Al, NiO is deoxidized into Ni, then reacting with LaOCl and Al into LaNi4Al. The current efficiency is 92.7%, the electrolysis energy consumption is as low as 3.55 kW·h/kg. It is concluded that SOM process has a bright future for industrial application because of its short process and high efficiency.

关 键 词：透氧膜 电解 氧化物 合金 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TM912[金属学及工艺—合金]