In-situ reaction bonding of porous SiC ceramics

被引：55
作者：
Ding, Shuqiang [1 ,2 ]
Zeng, Yu-Pinq [1 ]
Jiang, Dongliang [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2008年 / 59卷 / 02期
关键词：
reaction bonding; SiC; SiO2; mullite;
D O I：
10.1016/j.matchar.2006.12.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Porous Sic ceramics were prepared by an in-situ reaction bonding process from Sic, Al2O3 and graphite in air at 1400-1550 degrees C. The reaction bonding behavior during the sintering was studied. The surface of SiC particles is oxidized to amorphous silica above 750 degrees C. When the sintering temperature reaches 1100 degrees C, the amorphous silica begins to be crystallized to cristobalite. After 1400 degrees C, the oxidation-derived silica reacts with Al2O3 to form mullite. Porous Sic ceramics are bonded by the silica and mullite. In addition, the effects of sintering temperatures on the reaction bonding behavior, open porosity and flexural strength were investigated. (C) 2006 Elsevier Inc. All rights reserved.
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页码：140 / 143
页数：4
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