Anisotropic thermal conductivity of silicon nitride ceramics containing carbon nanostructures |
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| Authors: | Pilar Miranzo Eugenio García Cristina Ramírez Jesús González-Julián Manuel Belmonte M Isabel Osendi |
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| Affiliation: | 1. Nuclear and Energy Research Institute - IPEN/CNEN, 2242 Prof. Lineu Prestes Avenue, São Paulo, SP, 05508-000, Brazil;2. Geoscience Institute - IGC/USP, 562 Lago Street, São Paulo, SP, 05508-080, Brazil;1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141 Republic of Korea;2. Advanced Materials R&D Department, KCC Corporation, 19 Wanjusandan 4-ro, Wanju-gun, Jeonbuk-do, 55321 Republic of Korea;1. Kanagawa Academy of Science and Technology, KSP, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan;2. Yokohama National University, 79-7, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan;3. Nagaoka University of Technology, 1603-1 Kamitomioka Nagaoka, Niigata 940-2188, Japan;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China;3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;1. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;2. National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environments, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Silicon nitride (Si3N4) composites containing carbon nanotubes (CNTs) or graphene nanoplateles (GNPs) are of great relevance in the electronic and aerospace industries where the search for new materials with enhanced and anisotropic thermal conductivity to work in harsh environments is a strategic guideline. Here we study thermal conduction in Si3N4 composites with different amounts of carbon nanostructures. The effects of the nanostructure orientation respect the heat flux, the testing temperature and the α/β Si3N4 phase ratio are analyzed. The addition of CNTs and GNPs leads to an anisotropic thermal response, decreasing the through-thickness thermal conductivity of the Si3N4 composites and raising the in-plane thermal conductivity, especially for GNPs that enhance it up to twice that of the monolithic Si3N4. This effect is related to the preferred orientation of the nanostructures that gives a less resistive network in the in-plane direction and the intrinsic anisotropy of their thermal conductivity. |
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