Pitch-based ribbon-shaped carbon-fiber-reinforced one-dimensional carbon/carbon composites with ultrahigh thermal conductivity |
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| Affiliation: | 1. Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China;2. SARChI Chair of Carbon Technology and Materials, Institute of Applied Materials, University of Pretoria, Pretoria 0002, South Africa;3. Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China;1. Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeonbuk 565-905, Republic of Korea;2. Nanomaterials Science and Engineering, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 305-350, Republic of Korea;1. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;2. Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;3. Research for Education Center of Carbon Resources, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;4. Department of Organic and Nano Engineering, Hanyang University, 222 Wangsimniro, Seongdong-gu, Seoul 133-791, Republic of Korea;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China;3. Institute for Materials Research, University of Leeds, Leeds LS2 9JT, United Kingdom;1. Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. Department of Physics, Hebei Normal University for Nationalities, Chengde 067000, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Avic Composite Corporation Ltd., Beijing 101300, China;5. National Institute of Clean and Low Carbon Energy, Beijing 102209, China;6. Tianjin Polytechnic University, Tianjin 300387, China |
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| Abstract: | Ribbon-shaped carbon fibers have been prepared from mesophase pitch by melt-spinning, oxidative stabilization and further heat treatment. The internal graphitic layers of ribbon-shaped carbon fibers graphitized at 2800 °C show a highly preferred orientation along the longitudinal direction. Parallel stretched and unidirectional arranged ribbon-shaped carbon fibers treated at about 450 °C were sprayed with a mesophase pitch powder grout, and then hot-pressed at 500 °C and subsequently carbonized and graphitized at various temperatures to produce one-dimensional carbon/carbon (C/C) composite blocks. The shape and microstructural orientation of ribbon fibers have been maintained in the process of hot-pressing and subsequent heat treatments and the main planes of the ribbon fibers are orderly accumulated along the hot-pressing direction. Microstructural analyses indicate that the C/C composite blocks have a typical structural anisotropy derived from the unidirectional arrangement of the highly oriented wide ribbon-shaped fibers in the composite block. The thermal conductivities of the C/C composites along the longitudinal direction of ribbon fibers increase with heat-treatment temperatures. The longitudinal thermal conductivity and thermal diffusivity at room temperature of the C/C composite blocks graphitized at 3100 °C are 896 W/m K and 642 mm2/s, respectively. |
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