摘要
以N iO和Fe2O3为主要原料,研究了其在合成镍铁尖晶石反应烧结过程中的热力学及合成的镍铁尖晶石粉料烧结过程的动力学条件,利用球模型推导的扩散机制的烧结方程测算出不同合成温度烧结试样的烧结机制.同时对在不同烧结温度下合成的尖晶石粉料经二次烧结制备的阳极试样的抗折强度进行了测量.结果表明,N iO和Fe2O3固相反应的热力学条件具备,不同烧结温度烧结的N iFe2O4尖晶石粉料初期烧结由体积扩散和界面扩散共同控制,且当合成尖晶石温度为900℃时,惰性阳极试样气孔率达到一个最小值,此时强度值最大.
The reaction sintering thermodynamics and kinetics of NiFe2O4 were investigated using NiO and Fe2O3 as main raw materials. According to diffusion mechanism sintering equation deduced by sphere model, the sintering mechanism of different NiFe2O4spinel powder sintered at different sintering temperature was achieved. And the bending strength of samples was measured. It was shown that the thermodynamics condition of solid - state reaction with NiO and Fe2O3 is sufficient, and the initial stages sintering of NiFe2O4 spinel powder is controlled by volume diffusion and interface diffusion together. The porosity of sample is the lowest and the bending Key words strength is the highest when the synthesizing temperature is 900℃.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2006年第4期337-340,共4页
Materials Science and Technology
基金
国家重点基础研究发展规划项目(G1999064903)
国家高技术研究发展资助计划项目(2001AA335010)
关键词
镍铁尖晶石
固相反应
热力学
动力学
力学性能
NiFe2O4 spinel, solid reaction, thermodynamics, kinetics, mechanics performance
作者简介
焦万丽（1977-），女，博士研究生。
姚广春（1947-），男，教授，博士生导师。
