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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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High temperature corrosion of silicon nitride composite ceramics in sulfur-oxygen environments
WANG Xin(王 昕)1,2, SUN Kang-ning(孙康宁)1,2
LI Jing(李 静)2, YU Xue-gang(于薛刚)2,
 YIN Yan-sheng(尹衍升)1,2, YANG Lian-xi(杨

1. Key Laboratory of Liquid Structure and Heredity of Materials, 
Ministry of Education, Shandong University, Ji'nan 250061, China;
2. Key Laboratory of Engineering Ceramics, Shandong Province, 
Shandong University, Ji'nan 250061, China

Abstract:High temperature corrosion behavior of Si3N4-8%Al2O3(volume fraction) composite ceramics in sulfur-oxygen environments was studied. At 1150℃ and 1350℃, the corrosion processes follow parabolic law with parabolic rate constants (Kp) of 1.45×10-9g2·cm-4·s-1 and 7.92×10-9g2·cm-4·s-1, respectively. The corrosion mechanisms are different at different temperatures. At 1150℃, the corrosion of the material is due to the destruction of SiO2 layer caused by sulfur and the active oxidation corrosion. At 1350℃, the diffusion of additives and impurity elements to grain boundaries and outward to surface layers lead to the formation, growth and break of bubbles, which accelerates the corrosion rate of the Si3N4 ceramics.

 

Key words:  Si3N4 composite ceramics; sulfidation; oxidation; corrosion 

ISSN 1672-7029
CN 43-1423/U

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