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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2023, Vol. 42 ›› Issue (6): 2161-2171.

Special Issue: 陶瓷

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Interfacial Reaction Mechanism of Silicon Carbide and Heat Resistant Steel in High-Temperature Vacuum

XIE Yingying1, CHEN Mao1, SONG Zijie1, FAN Bingbing1, ZHANG Rui1,2, CHEN Yongqiang1   

  1. 1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;
    2. School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China
  • Received:2023-03-27 Revised:2023-03-27 Online:2023-06-15 Published:2023-06-25

Abstract: Silicon carbide (SiC) ceramics can be used as inner lining of reduction tank for magnesium smelting. The interfacial reaction between SiC and heat resistant steel was systematically investigated by diffusion couple experiment under vacuum and 1 200 ℃. The results show that at the early stage of reaction, the main products of interfacial reaction are metal silicide and graphite, and the lamellar graphite distributing at the interface hinders the interfacial reaction. However, due to the melting of silicon-nickel compounds with low melting point at interface, the lamellar graphite is transformed into fibrous graphite under the catalysis of Ni, losing its protective effect on silicon carbide. In addition, the interface reaction changes from solid-solid reaction to solid-liquid reaction, and the interfacial reaction process is accelerated, which accelerates the corrosion of silicon carbide by steel. Compared with heat resistant steel, the interfacial reaction rate between SiC and pure iron is obviously decreased, and the temperature required for the reaction is obviously increased. Reducing Ni content in heat resistant steel can effectively prevent the reaction between heat resistant steel and SiC.

Key words: SiC, heat resistant steel, interfacial, graphite, solid phase reaction

CLC Number: