Sintering Aids for Silicon Carbide Ceramics: Action Mechanisms and Research Progress
FU Zhendong1, ZHAO Jian2, DAI Yejing3, LIANG Ji1, LIU Rongzheng2
1 Key Laboratory for Advanced Ceramics and Machining Technology of the Ministry of Education, School of Materials Science and Engineering,Tianjin University, Tianjin 300072, China 2 Institute of Nuclear and New Energy Technology, Tsinghua University,Beijing 100084, China 3 School of Materials, Sun Yat-sen University, Guangzhou 510275, China
Abstract: Silicon carbide (SiC) ceramics are widely used in petrochemical, aerospace and heat exchangers owing to its excellent properties, such as high strength, high hardness and excellent resistance to oxidation, corrosion and thermal shock. In addition, SiC is also considered to be a structural component of future fission and fusion reactors because of its low activation under neutron irradiation conditions. However, pure dense SiC ceramics can only be obtained by sintering at high temperature with high pressure due to the high covalent bonding of Si-C bonds and low self-diffusion. In order to promote the densification of SiC and to alleviate the sintering conditions, the addition of sintering aids is crucial. In this paper, the thermodynamic conditions by adding sintering aids are discussed and the mechanisms of sintering aids to promoting SiC densification under different sintering conditions are summarized. The classification and the research progress of sintering aids for SiC ceramics in recent years are introduced. Future prospects of the research and development trend of the densification SiC ceramics are proposed.
付振东, 赵健, 戴叶婧, 梁骥, 刘荣正. 碳化硅陶瓷烧结助剂的作用机制与研究进展[J]. 材料导报, 2021, 35(1): 1077-1081.
FU Zhendong, ZHAO Jian, DAI Yejing, LIANG Ji, LIU Rongzheng. Sintering Aids for Silicon Carbide Ceramics: Action Mechanisms and Research Progress. Materials Reports, 2021, 35(1): 1077-1081.
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2021, Vol. 35 
