Microstructure and mechanical properties of the spark plasma sintered TaC/SiC composites: Effects of sintering temperatures |
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| Authors: | Han Liu Limeng Liu Feng Ye Zhiguo Zhang Yu Zhou |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Republic of Korea;2. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea;1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Engineering, Quchan Branch, Islamic Azad University, Quchan, Iran;3. Young Researchers and Elite Club, Khorramabad Branch, Islamic Azad University, Khorramabad, Iran;4. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Mining and Metallurgy Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;3. Ceramic Department, Materials and Energy Research Center (MERC), Karaj, Iran;4. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea;1. Plasma Forming Laboratory, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA;2. AMPAC and Nanoscience Technology Center, University of Central Florida, Orlando, FL 32816, USA;3. Instituto de Física and Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre RS, Brazil;4. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai 600 036, India;1. State Key Laboratory of Structural Analyses for Industrial Equipment, Dalian University of Technology, Dalian, 116033, China;2. Engineering Laboratory of Nuclear Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China |
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| Abstract: | TaC/SiC composites with 20 vol.% SiC addition were densified by spark plasma sintering at 1600–1900 °C for 5 min under 40 MPa. Effects of sintering temperatures on the densification, microstructures and mechanical properties of composites were investigated. The results showed the materials achieved >98% of theoretical density at a temperature as low as 1600 °C. While the TaC grains grew slightly with the sintering temperature increasing, the SiC particles in materials decreased in size. Equiaxed to elongated grain morphology transformation was observed in the SiC phase in the 1900 °C material to obtain a higher flexural strength and fracture toughness of 715 MPa and 6.7 MPa m1/2, respectively. Lattice enlargement of the TaC phase in the 1900 °C material suggested possible Si diffusion into TaC grains. Ta was also detected in SiC grains by energy dispersive spectroscopy. Glassy pockets present at multi-grain junctions explained the enhanced densification. |
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