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The Improvement of Electrical Insulation Performance and Its Mechanism of High Thermal Conductivity Silicone Rubber Composites
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DOI：10.1002/pen.70663.png)
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Abstract
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Silicone rubber (SiR) exhibits excellent electrical, mechanical and antifouling properties, and is widely used in power equipment, such as insulators and cable accessories. With the increasing popularity of high-voltage and high-power equipment, higher requirements have been imposed on the thermal conductivity and insulation performance of SiR. In this study, a multidimensional particle composite strategy was proposed to enhance the thermal conductivity of SiR, and the influence of various particle forms on its electrical insulation performance was thoroughly investigated. The results showed that 180 phr by mass of Al2O3 increased the thermal conductivity and breakdown strength of the composite material compared to pure SiR by 317.3% and 64.8%, respectively. Introducing 15 phr by mass of BNNs into the aforementioned composite material further increased the thermal conductivity and breakdown strength by 23% and 24.4%, respectively. Through simulation calculations of FFV and MSD, this study revealed the regulatory mechanism of multi-shaped inorganic fillers on the insulation performance of SiR, achieving simultaneous improvement of heat dissipation and insulation performance, and providing theoretical support for the engineering application of such composite materials in electrical equipment.
Keywords:
composite insulating material
electrical insulation property
SiR
thermal property
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