温度对防雷接地用石墨玻纤复合材料性能的影响

Influence of temperature on the property of graphite GF composite for lightning protection and grounding

研究了膨化温度、膨化时间对可膨胀石墨膨化体积及氧化失重率的影响,基于正交试验方法研究了温度对石墨线性能的影响,通过扫描电镜观察膨胀石墨与玻璃纤维以及粘结物界面在高温灼烧后的变化,通过研究得出随着灼烧温度的升高,石墨线的断裂负荷逐渐减小,耐温失量和直流电阻变化率均在标准范围内;当灼烧时间较短时,同时温度在750℃下,石墨线各项性能的变化率均在10%以内,可以得出,在断路器防护动作时间内,防雷接地用石墨基柔性接地体在遇到短路故障大电流作用下其耐受温度可达到750℃。研究结果对制备导电性能良好的石墨基柔性接地材料,提高石墨基柔性接地体导电、大电流耐受性能有指导意义。

The effects of expansion temperature and expansion time on the expansion volume and oxidation weight loss rate of expandable graphite were studied.Based on the orthogonal test method,the effects of temperature on the properties of graphite line were studied.The changes of the interface between expanded graphite,glass fiber(GF)and binder after high temperature burning were characterized by SEM.The results shown that with the increase of burning temperature,the breaking load of the line decreased gradually.The temperature loss resistance and DC resistance change rate were within the standard range.When the burning time was short and the temperature was at 750℃,the change rate of each performance of the graphite line was within 10%.It can be concluded that within the protective action time of the circuit breaker,the withstand temperature of the graphite based flexible grounding body for lightning protection can be Up to 750℃.The results were of great significance for the preparation of graphite based flexible grounding materials with good conductivity and the improvement of the conductivity and high current withstand performance of graphite based flexible grounding materials.