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Effects of Preheat‐Treated Aluminosilicate Addition on the Phase Development, Microstructure, and Mechanical Properties of Mullitized Porous OBSC Ceramics
Author(s) -
Liu Shifeng,
Zeng YuPing,
Jiang Dongliang,
Liu Shifeng
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02300.x
Subject(s) - materials science , aluminosilicate , flexural strength , microstructure , porosity , thermal shock , ceramic , composite material , phase (matter) , catalysis , biochemistry , chemistry , organic chemistry
Mullitized porous oxidation‐bonded SiC (OBSC) ceramics were fabricated with and without preheat‐treated aluminosilicate by an in situ reaction‐bonding process. The effects of the preheat‐treated aluminosilicate on the phase development, microstructure, and mechanical properties of porous SiC ceramics were investigated. With 5.0 wt% preheat‐treated aluminosilicate addition, the process of mullitization was significantly promoted. Owing to the enhancement of neck growth by the preheat‐treated aluminosilicate, a high flexural strength of 86.9 MPa was achieved at an open porosity of 35.3%, and the porous SiC ceramics maintained good thermal shock resistance. With 5.0 wt% preheat‐treated aluminosilicate addition, the average pore size of porous SiC ceramics was enlarged from 2.8 to 4.0 μm. The effects of preheat‐treated aluminosilicate content on the oxidation degree of SiC, open porosity, and flexural strength of porous SiC ceramics were also investigated.