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通过在聚四氟乙烯(PTFE)基体中添加不同比例微米、纳米尺度氮化硼(BN)或氮化铝(AlN),以提高高压断路器PTFE喷口复合材料的耐电弧烧蚀性能。利用CO2连续激光器烧蚀PTFE喷口材料来模拟电弧烧蚀过程,分析了光反射率、热导率以及相对介电常数对烧蚀量的影响。通过比较复合材料烧蚀量大小和数值分析结果可知,材料热学参数(热导率和热扩散系数)对烧蚀量起主要作用,BN/PTFE复合材料的耐烧蚀能力优于AlN/PTFE复合材料,10.0%BN/PTFE复合材料的热导率可以达到0.46W/(m·K),比纯PTFE的提高了92%,相应烧蚀过程中的质量损失为21.8mg,比3.0%AlN/PTFE复合材料的质量损失降低了47%,有效提高了喷口复合材料的耐烧蚀能力。
In order to improve the arc erosion resistance of high pressure circuit breaker PTFE nozzle composite, different proportions of micron, nanometer scale boron nitride (BN) or aluminum nitride (AlN) are added into the polytetrafluoroethylene (PTFE) matrix. The CO2 ablation material was used to simulate the arc ablation process by CO2 continuous laser ablation, and the influence of light reflectivity, thermal conductivity and relative dielectric constant on the ablation volume was analyzed. The results show that the thermal ablation parameters of the material (thermal conductivity and thermal diffusivity) play a major role in the ablation volume. The ablation resistance of the BN / PTFE composite is better than that of the AlN / PTFE composite The thermal conductivity of 10.0% BN / PTFE composite can reach 0.46W / (m · K), which is 92% higher than that of pure PTFE. The mass loss during the corresponding ablation process is 21.8mg, which is lower than 3.0% AlN / The mass loss of PTFE composites is reduced by 47%, effectively improving the ablation resistance of the spout composite.