液相共沉淀法合成浸渍阴极用Ba_5CaAl_4O_(12)  

Synthesis of Ba_5CaAl_4O_(12) used in impregnated cathode by chemistry liquid phase Co-precipitation

作　　者：沈春英[1] 李志顺[1] 丘泰[1] 宋涛[1] 

机构地区：[1]南京工业大学,江苏南京210009

出　　处：《无机盐工业》2006年第6期17-19,共3页Inorganic Chemicals Industry

基　　金：国防科工委基金资助(MKPT-05-211)

摘　　要：Ba5CaAl4O12是浸渍阴极电子发射最主要的活性物质。采用液相共沉淀法，通过调节共沉淀反应的金属盐溶液浓度、溶液的pH、沉淀剂的加入方式及洗涤方式，制备出分散良好的超细碳酸钡、碳酸钙、氢氧化铝的混合前驱体粉末，经1200℃煅烧2h，得到超细粉末。采用XRD，SEM分析产物粉末的物相组成、颗粒形貌，结果表明产物为具有Ba5CaAl4O12结构的结晶颗粒，粒径在0．2～0.5μm。Ba5CaAl4O12 is the most active material of electron emission in impregnated cathode. The preeusor, mixture powder of BaCO3 ,CaCO3 and Al（OH） 3 with good dispersibility,was prepared by chemistry liquid phase co - precipitation method through adjusting the solution concentration, the solution pH, adding style of the precipitator and washing style. Then the mixture was calcined at 1 200 ℃ for 2 h to obtain the uhrafine powder. The composition and morphology of the powder were analysed by XRD and SEM. The results show that the product has the structure of Ba5CaAl4O12 with the diameter of 0.2-0.5 μm.

关 键 词：液相共沉淀法 超细粉体 Ba5CaAl4O12 

分 类 号：TQ133.1[化学工程—无机化工]