CoMnNiO超微细粉体的合成及烧结特性  

Sintering Characterization of CoMnNiO Ultrafine Powders Prepared by the Evaporative Decomposition of Solutions Technique

作　　者：常爱民[1] 陶明德[1] 韩英[1] 

机构地区：[1]中国科学院新疆物理所

出　　处：《功能材料》1995年第6期545-548,共4页Journal of Functional Materials

摘　　要：以醋酸盐为原料，用喷雾热分解方法（ＥＤＳ）合成了粒径小于３０ｎｍ的ＣｏＭｎＮｉＯ纳米粉体。粉体压片后，在６００～１０００℃温区处理；ＸＲＤ谱观察了烧结体在不同温度下的晶粒尺寸和相变。烧结体断层的ＳＥＭ观察表明，纳米粉体的烧结机制不同于常规氧化物粉体，纳米粉体中颗粒的亚结构对烧结过程有显著影响。The multicomponent thermistorsystem Co_2O_3-MnO_2-NiO_2 were produced using theevaporative decomposition of solutions(EDS)method.Metal acetates were used as precursormaterials. A solution was made from the precursormaterials. This solution was spray dried in the EDSdevice at 750℃,causing the acetates to decompose.The typical morphology of powders created by spraydrying was represented by spongy particles. In thecase described,the products were dented spongyparticles with very small crystalline size(30 nm)andhigh specific surface area. As compared with thesame thermistor compositions produced by theconventional mixed oxide method,the EDS powdersshowed the familiar solid-state reactions(e. g. theformation of spinel)at the lower firing temperatureand had a different sintering mechanism. Thesubstructure in the particles played an important rolein the sintering process.

关 键 词：喷雾热分解 超微粉 烧结特性 合成 

分 类 号：TF123.72[冶金工程—粉末冶金]