摘要
应用ＴＰ速率等式和线性截距法研究了经１５００℃至１７００℃烧成的两个合成镁白云石体系中ＣａＯ和ＭｇＯ的晶粒生长，采用回归分析和最小二乘法求得ＣａＯ和ＭｇＯ晶粒的生长指数和晶位生长活化能。结果表明，体系中ＭｇＯ晶粒的生长速率总比ＣａＯ的要大，而加入少量ＣｅＯ２添加剂的合成镁白云石中ＣａＯ和ＭｇＯ晶粒生长速率比无添加剂的要快。
Using the traditional phenomenological rate equation and linear intercept methods,the grain growth of lime(CaO)and periclase(MgO) phase was studies in the synthetic magnesio-doloma (SMD) systems over the tern perature range1500℃ to 1700℃. From the regression analyses and the least square methods,the grain growth kinetic exponents and activation energies was obtained. The results indicate that in the two systems the grain growth rate of periclase phase is always larger than that of lime phase,but in the SMD system with CeO2 additives,the grain glowth is larger than that ofnormal system. The reasons of two differences are that the periclase phase in microstructure is the continuous matrixphase and dopping CeO2 decrease the activation energies of the grain growth of lime and periclase in SMD,in the meantime,the kinetics equation of lime and periclase in two system has been gained.
出处
《耐火材料》
CAS
北大核心
1996年第2期84-87,共4页
Refractories
关键词
镁白云石
晶粒生长
氧化镁
氧化钙
耐火材料
Synthetic magnesio-doloma Grain growth exponent Activation energies
