Densification mechanism,microstructure and mechanical properties of ZrC ceramics prepared by high-pressure spark plasma sintering |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Hubei Longzhong Laboratory, Xiangyang 441000, China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. School of Material Science and Energy Engineering, Foshan University, Foshan 528000, China;1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. State Key Laboratory of Green Building in Western China, Xi’an University of Architecture and Technology, Xi’an 710055, China;3. School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;4. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;1. Xi''an University of Technology, Xi’an 710048, PR China;2. Shaanxi Province Key Laboratory of Corrosion and Protection, Xi''an University of Technology, Xi’an 710048, PR China;1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, PR China;2. Beijing Institute of Long March Aerospace Vehicles, Beijing 100076, PR China;1. Department of Materials Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan;2. Department of Materials Science and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 891-0395, Japan;3. National Institute for Material Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Department of Materials Science and Engineering, School of Engineering, The University of Tokyo, Japan;5. Next Generation Zirconia Social Cooperation Program, Institute of Engineering Innovation, The University of Tokyo, Japan |
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| Abstract: | The traditional way of densifying high-melting-point ceramics at high temperatures with long soaking time leads to severe grain coarsening, which degrades the mechanical properties of ceramics. Here, highly dense (∼98%) zirconium carbide (ZrC) ceramics with limited grain growth were obtained by spark plasma sintering (SPS) at relatively low temperatures, 1900 ℃, with a high pressure up to 200 MPa in a reliable carbon-fiber-reinforced carbon composite (Cf/C) mold. Subgrains and high-density dislocations formed in the high-pressure sintered ceramics. The hardness and fracture toughness of the prepared highly dense ZrC ceramics reached 20.53 GPa and 2.70 MPa·m1/2, respectively. The densification mechanism was mainly plastic deformation under high pressure. In addition, ZrC ceramics sintered at high pressure possessed a high dislocation density of 7.30 × 1012 m−2, which was suggested to contribute to the high hardness. |
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| Keywords: | High pressure Spark plasma sintering Zirconium carbide Plastic deformation |
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