氧化物直接制备储氢合金LaNi_(4.6)Si_(0.4)  

Direct preparation of LaNi_(4.6)Si_(0.4) hydrogen storage alloy by SOM process

作　　者：赵炳建[1] 袁辉[1] 司新国[1] 鲁雄刚 

机构地区：[1]唐山钢铁集团有限责任公司,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：《粉末冶金材料科学与工程》2016年第2期236-242,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB613606);国家高技术研究发展计划(863计划)项目(2006AA06Z124)

摘　　要：采用La_2O_3,NiO和SiO_2为原料,采用固体透氧膜法(solid oxygen-ion membrane,缩写为SOM)直接制备三元储氢合金LaNi_(4.6)Si_(0.4)。分析La_2O_3-NiO-SiO_2烧结片的组成及CaCl_2熔盐中的侵蚀反应;结合电解中间产物的组成分析反应机理,并推导以电流表示的反应速率公式。结果表明:SOM法电解La_2O_3-NiO-SiO_2烧结片直接制备LaNi_(4.6)Si_(0.4)是可行的,产品呈一定程度的海绵状;烧结片组成为NiO,La_4Ni_3O_(10)和La_(10)(SiO_4)6O_3;电解机理为La_4Ni_3O_(10),La_(10)(SiO_4)6O_3与Cl-反应生成LaOCl和SiO_2,LaOCl,SiO_2与NiO电解出的Ni反应生成LaNi_(4.6)Si_(0.4);电解反应最合理的电压为3.5 V。The LaNi4.6Si0.4 hydrogen storage alloy was prepared directly from La2O3, NiO and SiO2 by solid oxygen-ion conducting membrane process. The phase composition and the corrosion behavior in the molten salt of the sintered pellets were examined, and the reduction mechanism was investigated by analyzing phase constitution of the intermediate product. The equation of the electrolysis rate was also calculated. The results show that the direct electrochemical reduction of NiO-La2O3-SiO2 mixed powders to LaNi（4.6）Si（0.4） alloy by SOM process is feasible. The reduction of sintered pellet starts from the process that La4Ni3O10 and La10SiO46O3 react with Cl-to form LaOCl and SiO2, and Ni O is deoxidized into Ni. The Ni then reacts with LaOCl and SiO2 to from LaNi4.6Si0.4. The optimum electrolysis voltage is 3.5 V.

关 键 词：固体透氧膜 电解 氧化物 储氢合金 LaNi4.6Si0.4 

分 类 号：TG146.4[一般工业技术—材料科学与工程]