Pressureless-sintered boron nitride nanosheets/glass composite ceramics for excellent mechanical,dielectric and thermo-conductive performances |
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| Affiliation: | 1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;2. Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China;1. Functional Materials and Acousto-optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;2. Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001, China;3. School of Physics and Electronic Engineering, Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, China;1. Laboratoire des Composites Thermostructuraux, CNRS, Univ. Bordeaux, Safran Ceramics, CEA, 3, allée de La Boétie, 33600 Pessac, France;2. Safran Ceramics, 105 avenue Marcel Dassault, 33700 Merignac, France;3. Dassault Aviation, 54 avenue Marcel Dassault, 33700 Mérignac, France;4. Air Liquide Paris, Innovation Campus, 781350 Les Loges en Josas, France;5. ArianeGroup, 3 Rue de Touban, 33185 Le Haillan, France;1. August Chełkowski Institute of Physics, University of Silesia in Katowice, ul. 75 Pułku Piechoty 1, 41–500 Chorzów, Poland;2. Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics, Vilnius University, Saulėtekio av. 3, LT-10257 Vilnius, Lithuania;3. Institute of Materials Engineering, University of Silesia in Katowice, ul. 75 Pułku Piechoty 1, 41–500 Chorzów, Poland;4. Department of Physics, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic |
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| Abstract: | Because they have a high application potential in the thermal management of insulation environments, high-quality hexagonal boron nitride (h-BN)-based multiphase ceramics have been highly desired. However, so far, their synthesis is still full of challenges. Here, a kind of boron nitride nanosheets (BNNSs)/glass (GS) composite ceramics was prepared by a pressureless sintering method at a lower temperature of 900 °C. Due to a tightly bonded interaction between BNNSs and GS, the formed BNNSs/GS ceramics exhibit excellent multifunction performance. They have an outstanding compressive strength in the range of 19 ∼ 64 MPa and Vickers hardness ranging from 50 to 179 HV. For the BNNSs/GS ceramics with BNNS’s filling fraction of 90 wt%, their maximum side-surface TC values are 12.01 ± 0.18 W m−1 K−1 at 25 °C and 13.64 ± 0.37 W m−1 K−1 at 300 °C, respectively. In the ultra-high frequency range of 26.5 ∼ 40 GHz, the dielectric constant values of the BNNSs/GS ceramics are primarily between 2 and 3, and the corresponding loss tangent values are < 0.3. In addition, based on the remarkable integrity of their structure, these BNNSs/GS ceramics exhibit outstanding thermal-shock stability and prominent thermal management capacity during lots of heating/cooling-testing cycles. Therefore, we believe this kind of BNNSs/GS ceramic system will have great application potential in the new-generation thermal management and/or insulation packaging fields. |
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| Keywords: | Boron nitride nanosheets Glass Multiphase ceramics Thermal management Pressureless sintering boron nitride nanosheets" },{" #name" :" keyword" ," $" :{" id" :" key0035" }," $$" :[{" #name" :" text" ," _" :" (BNNSs) glass" },{" #name" :" keyword" ," $" :{" id" :" key0045" }," $$" :[{" #name" :" text" ," _" :" (GS) dielectric constant" },{" #name" :" keyword" ," $" :{" id" :" key0055" }," $$" :[{" #name" :" text" ," _" :" (DC) thermal conductivity" },{" #name" :" keyword" ," $" :{" id" :" key0065" }," $$" :[{" #name" :" text" ," _" :" (TC) |
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