化学镀法制备W@Ce(OH)_(4)核-壳复合粉末分析与研究  

Analysis and research on preparation of W@Ce(OH)_(4)core-shell composite powder by electroless plating

作　　者：曹燕[1] 吴翔云 王婵 张宁飞 邢晓玉 黄贞益[1] CAO Yan;WU Xiangyun;WANG Chan;ZHANG Ningfei;XING Xiaoyu;HUANG Zhenyi(School of Metallurgy,Anhui University of Technology,Ma'anshan 243002,Anhui,China)

机构地区：[1]安徽工业大学冶金学院,安徽马鞍山243002

出　　处：《金属功能材料》2023年第5期70-77,共8页Metallic Functional Materials

摘　　要：为了确定采用化学镀法制备以W颗粒为核以Ce(OH)_(4)为壳的W@Ce(OH)_(4)核-壳结构的可行性以及Ce(OH)_(4)的反应途径。向由含高纯钨粉的Ce(NO_(3))_(3)-6H_(2)O和聚乙烯二醇混合水溶液中逐滴加入NaOH_(4)采用实验观察、粉体和烧结体组织结构分析等相结合的手段对上述可行性与反应途径进行了分析。结果表明,采用化学镀法可成功制备W@Ce(OH)核-壳结构。在未滴入NaOH水溶液时,即使经历24h,在pH值呈弱酸性(约5.63)的混合水溶液中也无反应迹象发生,Ce(OH)_(4)壳无法生成。在逐滴滴入NaOH水溶液后,水溶液中逐渐出现反应迹象,并随着NaOH滴入量的增加,混合溶液中W颗粒的颜色由原始的灰色,逐渐变化为灰白色并最终变化为淡黄色。Ce(OH)_(4)壳是在W颗粒表面首先通过Ce3+与OH反应生成Ce(OH):沉淀,然后该沉淀与溶解氧和水反应生成。In order to determine the feasibility of preparing W@Ce(OH)_(4)core-shell structure with W particle as core and Ce(OH)_(4)as shell by electroless plating method,and the reaction pathway of Ce(OH)_(4),NaOH was added dropwise to a mixed aqueous solution of Ce(NO_(3))_(3)-6H_(2)O and polyethylene glycol containing high-purity tungsten powder.Feasibility and reaction pathway were analyzed by combining experimental observation,microstructure analysis of powder and sintered body.The results show that the electroless plating method can be successfully prepared W@Ce(OH)_(4)core-shell structure.When the aqueous solution of NaOH is not dripped,even after 24 hours,there is no sign of reaction in a mixed aqueous solution with a weak acidic pH(about 5.63),and Ce(OH)_(4)shells cannot be formed.After dropping the NaOH aqueous solution dropwise,signs of reaction gradually appear in the aqueous solution.As the amount of NaOH drops increases,the color of the W particles in the mixed solution changes from the original gray to white and eventually to yellow.Ce(OH)_(4)shell is formed on the surface of W particles by first reacting Ce3+with OH-to form Ce(OH)s precipitation,which is then formed by reacting with dissolved oxygen and water.

关 键 词：钨 化学镀 复合粉末 核-壳结构 反应途径 

分 类 号：TB333[一般工业技术—材料科学与工程]