INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Sintering Aids for Silicon Carbide Ceramics: Action Mechanisms and Research Progress |
FU Zhendong1, ZHAO Jian2, DAI Yejing3, LIANG Ji1, LIU Rongzheng2
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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 |
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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.
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Published: 19 January 2021
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Fund:This work was financially supported by the National Natural Science Foundation of China (21771116). |
About author:: Zhendong Fu received his bachelor's degree in inorganic material engineering from Shandong University of Science and Technology in 2018. He is currently pur-suing his master's degree at School of Materials Science and Engineering of Tianjin University, under the supervision of Professor Liu Rongzheng of Tsinghua University. His research has focused on the new sintering aid system for silicon carbide ceramics sintering. Rongzheng Liu received his B.E. degree in materials science and engineering from Hunan University in 2007 and received his Ph.D. degree in materials science and engineering from Tsinghua University in 2012. After that, he entered Institute of Nuclear and New Energy Technology of Tsinghua University. He is currently an associate professor and doctoral supervisor in Tsinghua University. His research interests are nuclear used SiC ceramics, coated fuel particles and FB-CVD for nanoscaled materials. He has published more than 50 papers in related area. |
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