A polytetrafluoroethylene composite material with arc ablation resistance and its preparation method and application

Abstract

The invention discloses a polytetrafluoroethylene composite material with arc ablation resistance performance, a preparation method and application thereof. The method uses polytetrafluoroethylene as a matrix and inorganic powder boron nitride as a filler to prepare a polytetrafluoroethylene composite sample through the steps of batching, mixing, molding, sintering, mechanical processing and the like. The present invention modifies polytetrafluoroethylene by changing the ratio of micro-nano boron nitride fillers, and the optimum mass fraction range of doping is: 0.5-1% of nano-boron nitride and 6.5-6% of micro-boron nitride . The preparation scheme proposed by the invention greatly changes the light reflectance and thermal conductivity of the polytetrafluoroethylene composite material, significantly improves the arc ablation resistance of the polytetrafluoroethylene composite material, and can be widely used in high voltage equipment field.

Description

technical field [0001] The invention belongs to the field of high-voltage insulating materials, and relates to a polytetrafluoroethylene composite material with arc ablation resistance and a preparation method thereof. Background technique [0002] High-voltage circuit breakers are the most important protection equipment in power systems. During the operation of the circuit breaker, most of the faults occur in the arc extinguishing chamber. The energy generated by the arc is absorbed by the nozzle of the arc extinguishing chamber, resulting in ablation, causing failure of electrical equipment, and may even cause safety problems. Therefore, improving the arc ablation resistance of the nozzle is of great significance to prolong the service life of the high voltage circuit breaker. At present, the nozzle of the arc extinguishing chamber is mainly made of insulating material PTFE. However, with the increase of working voltage, pure polytetrafluoroethylene can no longer meet t...

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Problems solved by technology

[0005] However, previous studies mainly focused on the filler content and filler particle size. With the increase of boron nitride content, the arc ablation resistance of the material gradually increases, and a larger filler particle size can further increase the arc ablation resistance of the material. However, there is no report on improving the arc ablation resistance of polytetrafluoroethylene composites by changing the proportion of micro-nano fillers.

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