ZHOU Aiping 1, YU Changxin 2, WEI Chuncheng 2, LI Chunlong 2, LI Chao 1

(1.School of Science, Shandong University of Technology, Zibo, 255049, Shandong, China; 2. School of Materials Science and

Engineering, Shandong University of Technology, Zibo, 255049, Shandong, China)

Abstract: 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 Al2O3 and 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.

Key words: residual strength; thermal shock resistance; porous ceramics; alumina; silicon carbide