Si_3N_4─SiC耐火材料的碱蚀动力学

Alkaline Erosion Kinetics of Si 3N 4 Bonded SiC Refractory

对Ｓｉ３Ｎ４结合的ＳｉＣ的抗碱蚀机理进行了动力学实验研究．结果表明，其碱蚀过程受化学与扩散混合控制；碱蚀增重及残余强度与碱蚀时间呈１／２次幂函数规律变化，与温度分别呈线性和二次幂函数规律变化．

Study on the alkali erosion mechanism of Si 3N 4 SiC refractory has been carried out. Results show that alkali erosion course is controlled by chemical rewtion and diffusion,and that increased weight of alkali erosion and remaining strength qpper the 12 power functional regularity with reaction time and the 2 power functional reguiarity with temperature;but the rate of increased weight and the rate of remaining strength appear the -12 power functional regularity with reaction time.