Effect of Pressing Mode and Pressure on Arc Ablation Performance of PTFE/BN Composites

With the development of high voltage transmission, higher voltage is necessary. Power equipment with traditional materials can not satisfy the insulation requirement of higher voltage transmission, so excellent material is urgently needed. PTFE nozzle is important in circuit breaker which faces the problem of arc ablation, and the nozzle with better performance is helpful to improve the transmission voltage. In this paper, in order to study the influence of different pressing pressures and modes on the ablation performance of PTFE/BN composites, four pressures and two modes were adopted (cold isostatic pressing and mould pressing) to obtain 7-wt% BN doped PTFE composites. As the pressing pressure increases, the ablation amount of the specimen decreases gradually. Compared with mould pressing, the specimen prepared by cold isostatic pressing has a higher thermal conductivity and lower ablation amount, while the light reflection properties are almost the same for both preparing methods. This paper is of great significance to improve the ablation resistance of nozzle materials.