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.
Highlights
High-temperature-vulcanized silicone rubber (SR) is widely used to manufacture high voltage insulators due to its relatively light weight and excellent anti-contamination ability [1,2,3,4]
SR composites with various aluminum nitride (AlN) and alumina tri-hydrate (ATH) content were used to prepare SR/ATH/AlN
Demonstrated improvements in thermal stability, breakdown strength and thermal conductivity, In addition, higher AlN loading resulted in a reduced dielectric constant and dielectric loss for the while the mechanical properties deteriorated
Summary
High-temperature-vulcanized silicone rubber (SR) is widely used to manufacture high voltage insulators due to its relatively light weight and excellent anti-contamination ability [1,2,3,4]. It is often filled with suitable additives so that the performance of the SR composites can be improved [5,6,7,8,9,10,11]. Aluminum nitride (AlN) is a thermally conductive material with a combination of good electrical insulation ability and low dielectric loss, Materials 2020, 13, 2489; doi:10.3390/ma13112489 www.mdpi.com/journal/materials. To understand the structure–property relationship in these SR composites, the microstructure, thermal properties, dielectric properties and mechanical performance were investigated
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