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      Performance of Silicone Rubber Composites Filled with Aluminum Nitride and Alumina Tri-Hydrate

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          Abstract

          In this study, silicone rubber (SR) composites were prepared with various amounts of aluminum nitride (AlN) and alumina tri-hydrate (ATH), and vinyl tri-methoxysilane (VTMS) was also introduced to prepare SR/ATH/AlN–VTMS composites for comparison. Compared to the SR/ATH composites, the SR/ATH/AlN composites with higher AlN loading exhibited higher breakdown strength and thermal conductivity, which were further improved by the addition of VTMS. Such results were related to the enhanced rubber–filler interfacial interactions from VTMS coupling, as demonstrated by scanning electron microscopy (SEM) analysis and the curing behaviors of the SR composites. Moreover, by replacing ATH with VTMS-coupled AlN, the SR/ATH/AlN–VTMS composites also exhibited lower dielectric loss along with an increased dielectric constant, suggesting the promising application of VTMS-coupled AlN as a filler for the preparation of the SR composites as high-voltage insulators.

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          Advances in Thermal Conductivity

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            Properties of Polymer Composites Used in High-Voltage Applications

            The present review article represents a comprehensive study on polymer micro/nanocomposites that are used in high-voltage applications. Particular focus is on the structure-property relationship of composite materials used in power engineering, by exploiting fundamental theory as well as numerical/analytical models and the influence of material design on electrical, mechanical and thermal properties. In addition to describing the scientific development of micro/nanocomposites electrical features desired in power engineering, the study is mainly focused on the electrical properties of insulating materials, particularly cross-linked polyethylene (XLPE) and epoxy resins, unfilled and filled with different types of filler. Polymer micro/nanocomposites based on XLPE and epoxy resins are usually used as insulating systems for high-voltage applications, such as: cables, generators, motors, cast resin dry-type transformers, etc. Furthermore, this paper includes ample discussions regarding the advantages and disadvantages resulting in the electrical, mechanical and thermal properties by the addition of micro- and nanofillers into the base polymer. The study goals are to determine the impact of filler size, type and distribution of the particles into the polymer matrix on the electrical, mechanical and thermal properties of the polymer micro/nanocomposites compared to the neat polymer and traditionally materials used as insulation systems in high-voltage engineering. Properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, erosion resistance, space charge behavior, electric breakdown, tracking and electrical tree resistance, thermal conductivity, tensile strength and modulus, elongation at break of micro- and nanocomposites based on epoxy resin and XLPE are analyzed. Finally, it was concluded that the use of polymer micro/nanocomposites in electrical engineering is very promising and further research work must be accomplished in order to diversify the polymer composites matrices and to improve their properties.
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              Improvement in thermal conductivity of through-plane aligned boron nitride/silicone rubber composites

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                29 May 2020
                June 2020
                : 13
                : 11
                : 2489
                Affiliations
                [1 ]Inner Mongolia Electric Power Science & Research Institute, Hohhot 010020, China; dkyzjj@ 123456163.com (J.Z.); dlfwx1994@ 123456163.com (W.F.); nmdkyxlm@ 123456163.com (L.X.)
                [2 ]School of Renewable Energy, North China Electric Power University, Beijing 102206, China; heshaojian@ 123456ncepu.edu.cn (S.H.); jqw9542@ 123456163.com (J.W.)
                [3 ]State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
                Author notes
                [* ]Correspondence: yxue@ 123456ipe.ac.cn (Y.X.); jun.lin@ 123456ncepu.edu.cn (J.L.)
                Author information
                https://orcid.org/0000-0002-4358-4662
                Article
                materials-13-02489
                10.3390/ma13112489
                7321244
                32486048
                7af66e95-074d-4d08-ac78-82e2dbf7d8e7
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 08 May 2020
                : 28 May 2020
                Categories
                Article

                silicone rubber,aluminum nitride,alumina tri-hydrate,vinyl tri-methoxysilane,dielectric loss,breakdown strength

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