尖晶石生成方式对MgO-Al_2O_3系制品热震后强度的影响  

Influence of Spinel Forming Way on Cold Crushing Strength of Magnesia-Alumina Refractory after Thermal Shock Resistance

作　　者：刘新[1] 曲殿利[1] 李志坚[1] 

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,鞍山114044

出　　处：《硅酸盐通报》2011年第2期411-414,共4页Bulletin of the Chinese Ceramic Society

摘　　要：分别用热震试验后常温耐压强度的损失率及超声波声速的衰减率来分析不同生成方式的尖晶石对MgO-A l2O3系制品热震后强度的影响。根据弹性力学理论、断裂力学理论以及XRD分析和显微结构分析结果表明:基质中有原位生成尖晶石的试样热震试验后强度异常增加,原因是离子置换产生的张应力、急冷过程中由于方镁石和尖晶石热膨胀系数的差异,在尖晶石基质中产生的张应力和热震循环过程中尖晶石晶格的发育长大所起作用较热震结构损伤占主导时,综合作用的结果表现为试样热震后的常温耐压强度增加。This paper deeply studied the influence of spinel forming way on cold crushing strength（CCS）of MgO-Al2O3 refractory after thermal shock resistance（TSR） by strength loss rate and velocity loss rate.By means of X-ray diffraction,micro structure,elastic mechanics theory and fracture mechanics theory,the results indicated that the spinel in-suit in the matrix led to the abnormally change of CCS after TSR;the structural damage resulted from thermal shock led to the decrease of CCS,whereas spinel lattice grow up,ion substitution and thermal expansion coefficient difference between periclase and spinel bring tensile press strengthened the CCS;while the effect of tensile press played the prime role,the sample with spinel in-suit in the matrix could demonstrate high CCS in the initial stage after thermal shock test.

关 键 词：尖晶石 生成方式 抗热震性 超声波 

分 类 号：TQ175[化学工程—硅酸盐工业]