Journal of Inorganic Materials ›› 2016, Vol. 31 ›› Issue (6): 661-666.doi: 10.15541/jim20150579

• Orginal Article • Previous Articles     Next Articles

Effect of Residual Phase and Grain Size on Corrosion Resistance of SiC Ceramics in Mixed HF-HNO3 Acid Solution

Ze-Hua LIU1,2, Qian QI2, Yong-Jie YAN2, Hui ZHANG2, Xue-Jian LIU2, Hong-Jie LUO1, Zheng-Ren HUANG2()   

  1. 1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
    2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2015-11-24 Online:2016-06-20 Published:2016-05-19
  • About author:LIU Ze-Hua(1989–), male, candidate of master degree. E-mail: liuzehualxtx@126.com
  • Supported by:
    National Natural Science Foundation of China (51202270);Strategic Pilot of Science and Technology of Chinese Academy of Sciences (Class A: XDA02040206)

Abstract:

Effect of residual phase and grain size the corrosion resistance of SiC ceramics in mixed HF-HNO3 acid solution was investigated. Three kinds of fabrication methods (SSiC-solid state sintered SiC, LPS SiC-liquid phase sintered SiC and RB SiC-reaction bonded SiC) were adopted to prepare SiC ceramics. Besides, the grain size in SiC ceramics was adjusted under different sinter temperatures. Compared to RB SiC and LPS SiC ceramics, SSiC ceramics showed a better corrosion resistance for the good corrosion resistance of residual graphite and ‘island’ structure of residual phase in ceramics. The grain size of SiC ceramics sintered at temperature between 2100℃ and 2160℃ increase from 2 μm to 6 μm, and the absolute values of Y intercept, which reflect the corrosion of SSiC ceramics with none residual phase, are 9.22 μg/cm2 (2100℃), 5.81 μg/cm2 (2130℃) and 0.29 μg/cm2 (2160℃), which demonstrate that large grain size is beneficial to the corrosion resistance of SiC ceramics.

Key words: SiC, corrosion resistance, residual phase, grain size

CLC Number: 

  • TQ174