Enhanced dielectric and thermal performance by fabricating coalesced network of alumina trihydrate/boron nitride in sili
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Bull Mater Sci (2020) 43:220 https://doi.org/10.1007/s12034-020-02201-8
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Enhanced dielectric and thermal performance by fabricating coalesced network of alumina trihydrate/boron nitride in silicone rubber for electrical insulation M TARIQ NAZIR1,* , B TOAN PHUNG2, GUAN H YEOH1, GHULAM YASIN3, SHAKEEL AKRAM4, M SHOAIB BHUTTA5, M ALI MEHMOOD5, SHAHID HUSSAIN6, SHIHU YU7 and IMRANA KABIR1 1
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney 2052, Australia School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney 2052, Australia 3 State Key Laboratory of Chemical Resource Engineering, College of Energy, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China 4 Institut d’Electronique et des Syste`mes (IES), UMR 5214, CNRS, Universite´ de Montpellier, Montpellier 34095, France 5 The State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, People’s Republic of China 6 School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China 7 Electric Power Research Institute of Guangdong Power Grid Co. Ltd., Guangzhou 510080, People’s Republic of China *Author for correspondence ([email protected]) 2
MS received 20 January 2020; accepted 18 February 2020 Abstract. Silicone rubber filled with micron-alumina trihydrate (ATH) is a substantially used composite material for high voltage outdoor insulators. This article investigates the effect of nano-boron nitride (BN) addition on the dielectric, thermal stability and thermal conductivity of solely micron-ATH-filled silicone rubber by fabricating coalesced network of particles. Micron-ATH/nano-BN-filled hybrid silicone rubber composites are fabricated with a ratio of 30/0 wt% (ATH30), 29/1 wt% (ATBN1), 27/3 wt% (ATBN3), 25/5 wt% (ATBN5) and 23/7 wt% (ATBN7) using mechanical mixing and water bath sonication techniques. Results suggest that the hybrid batch of silicone rubber composites (ATBN) possess lower permittivity, dielectric loss, enhanced thermal stability and thermal conductivity relative to ATH30. ATBN1 offers low permittivity and dielectric loss values of 3.64 and 0.0086 at 1000 Hz relative to 3.87 and 0.0224 of ATH30, respectively. As far as thermal properties are concerned, ATBN5 emerges as the most promising candidate for electrical insulation with 31 and 200°C higher temperatures for 10 and 15% mass loss, whilst it has shown 20% higher thermal conductivity than ATH30. Keywords.
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Silicone rubber; hybrid composites; dielectric properties; thermal stability; thermal conductivity.
Introduction
Over the past three decades, substantial attention has been grabbed by silicone rubber, ethylene propylene diene monomer (EPDM), ethylene-vinyl acetate and cycloaliphatic epoxy for the fabrication of weather sheds of high voltage insulators. The major attributes of polymeric insulating technolo
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