Abstract
In order to address the contradiction that breakdown strength and thermal conductivity of materials are difficult to improve simultaneously, we report a novel calcined silicon dioxide/cationic polymer/nano-diamond (SD*@ND) filler with high electron affinity via self-assembled in-situ polymerization, electrostatic interaction and calcination technique. Subsequently, the calcined SD*@ND fillers are intercalated into the silicone gel to achieve a concurrent enhancement of electrically insulating properties and thermal conductivity of composites. For example, breakdown strength and thermal conductivity of the silicone gel composites with 20 wt% calcined SD*@ND are 17.97 kV/mm and 0.557 W/m·K, respectively. These results are remarkably higher than those (16.77 kV/mm, 0.211 W/m·K) of silicone gel usually used as a commercial packaging material of power devices. Meanwhile, it also shows excellent high-temperature electrically insulating properties. This work provides a scalable approach to developing a novel silicone gel composites with high performance.
Published Version
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