窑具抗热震性评价方法的研究

Research on evaluation methods for thermal shock resistance of kiln furniture

针对现有抗热震方法在评价窑具材料时存在的局限性,在YB/T376.3-2004水急冷-裂纹判定法的基础上,提出了空气急冷-裂纹判定法。结果表明该方法适合于窑具材料抗热震性的评价。相同材质、相同形状的刚玉-莫来石质窑具的热震次数与使用次数存在相关性。而对相同材质、不同形状或不同材质、相同形状的窑具之间,不适合进行抗热震性的对比。该方法测定的热震次数与水急冷法的结果差别较大,水急冷法的热震次数明显高于空气急冷-裂纹判定法。

Several existing methods used to evaluate thermal shock resistance of kiln furnitures have some limitations. Based on YB/T 376.3 -2004 water quenching-cracks determination method ,a new method ,air quenchingcracks determination method is introduced to evaluate the thermal shock resistance of kiln furniture ,which is applicable for kiln furniture with same shapes and materials rather than those with different shapes and materials. For corundum -mullite kiln furnitures with same materials and shapes, there is a correlation between number of cycles in labs and that in services. Comparison between the method and waterquenching method（YB/T 376. 1 - 1995） is studied. The results show that for standard bricks and slab with same materials and close properties ,thermal shock cycling times in water-quenching method are obviously more than that of air quenching-cracks determination method.