关键工艺参数对铬酸镧粉体形态的影响  

Influence of Key Process Parameters on Powder Morphology of Lanthanum Chromites

作　　者：李士刚[1] 李胜利[1] 王笑[1] 敖青[1] 孙良成[2] 

机构地区：[1]山东大学材料科学与工程学院,山东济南250061 [2]包头稀土研究院,内蒙古包头014030

出　　处：《金属热处理》2007年第3期30-32,共3页Heat Treatment of Metals

基　　金：高等学校博士学科点专项基金(20050422026);山东省自然科学基金(Y2005F20)

摘　　要：采用Pechini法制备了铬酸镧超细粉体,在系统分析Pechini法工艺的基础上,找出了影响粉体形貌的关键因素,即柠檬酸量、乙二醇量、凝胶干燥温度、加热速率和煅烧温度,并确定了最佳工艺参数。结果表明,在柠檬酸与金属阳离子的摩尔比1.2∶1、乙二醇与柠檬酸的摩尔比3∶1条件下制得的凝胶在80℃干燥,并将干凝胶在800℃直接煅烧,可以获得均匀、极少团聚的铬酸镧超细粉体,平均粒径约为40 nm。Lanthanum chromite superfine powders were prepared by Pechini method. On basis of systematically studied of the process, the key factors,that is,content of citric acid and ethylene glycol, gel drying and calcining temperature,heating rate,were detected and the optimum process parameters were determined.mol ratio between citric acid and metal ions C： M = 1.2： 1 ;mol ratio between ethylene glycol and citric acid EG： CA =3：1 ;the drying temperature of gel is 80℃ ;the dry gel is calcined at 800 ℃directly. Using the process, uniform and little aggregative superfine powders of lanthanum chromite were obtained, of which the mean particle size is about 40 nm.

关 键 词：Pechini法 铬酸镧粉体 工艺参数 

分 类 号：O648.16[理学—物理化学]