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.

中文翻译：

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通过在用于电绝缘的硅橡胶中制造三水合氧化铝/氮化硼的聚结网络来增强介电和热性能

填充有微米级三水合氧化铝 (ATH) 的硅橡胶是一种广泛用于高压户外绝缘子的复合材料。本文通过制造聚结的颗粒网络研究了纳米氮化硼 (BN) 添加对仅填充微米级 ATH 的硅橡胶的介电、热稳定性和热导率的影响。以30/0 wt% (ATH30)、29/1 wt% (ATBN1)、27/3 wt% (ATBN3)、25/5 wt%的比例制造微米-ATH/纳米-BN填充的混合硅橡胶复合材料% (ATBN5) 和 23/7 wt% (ATBN7) 使用机械混合和水浴超声技术。结果表明，与 ATH30 相比，硅橡胶复合材料 (ATBN) 的混合批具有较低的介电常数、介电损耗、增强的热稳定性和导热性。ATBN1 的介电常数和介电损耗值在 1000 Hz 时分别为 3.64 和 0.0086，而 ATH30 的介电常数和介电损耗分别为 3.87 和 0.0224。就热性能而言，ATBN5 成为最有希望的电绝缘候选者，温度升高 31 和 200°C，质量损失 10% 和 15%，同时它的导热性比 ATH30 高 20%。