Porous alumina and silicon carbide filtering ceramics tubes were manufactured by isostatic pressing method, and the influence of thermal shock temperature difference on residual strength was investigated. SEM and EDS were used to analyze surface microstructure and elemental composition. The pores were uniformly distributed in both the two ceramics tubes, and the porosity reached 31% and 32%, respectively. Before thermal shock, the flexural strength of porous alumina ceramic tubes was 36 Mpa, which is higher than 16 Mpa of silicon carbide. The critical temperature difference for Al2O3and SiC was calculated as 461 ℃ and 409 ℃, respectively. Compared with silicon carbide ceramics, porous alumina ceramic had the better thermal shock resistance which can be attributed to fewer cracks and defects caused by thermal shock on the surface of samples.%利用等静压成型工艺制备出氧化铝和碳化硅多孔陶瓷过滤管,研究了热震温差对多孔陶瓷残余强度的影响.利用SEM和EDS对试样表面的微观结构和元素成分进行观测分析.两种陶瓷管表面气孔分布均匀,显气孔率分别达到31%和32%.热震前,氧化铝多孔陶瓷的弯曲强度为36 MPa,高于碳化硅的16 MPa.氧化铝和碳化硅的临界温差分别为461 ℃和409 ℃.相比之下,氧化铝多孔陶瓷具有较好的抗热震性,归因于热震后试样表面较少的裂纹和缺陷.
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