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采用锥形量热仪实验研究环氧树脂基体、T300碳纤维/环氧复合材料及T300碳纤维/环氧-泡沫层合板(上下层为T300碳纤维/环氧复合材料,中间层为4mm厚的Divinycell H60泡沫芯材)在不同火灾环境下的燃烧性能。对比分析其点燃时间、热释放速率、总烟气释放量和CO生成速率等燃烧特性参数的变化规律。利用SEM测试T300碳纤维/环氧复合材料燃烧前、后表面形貌图像和环氧树脂基体和T300碳纤维/环氧复合材料燃烧形成炭层的形貌图像,分析碳纤维在碳纤维/环氧复合材料热解、燃烧过程中的影响作用。结果表明,随热辐射强度的增加,三种实验样品的平均点燃时间均缩短,热释放速率峰值和300s内热释放速率均值均增大,峰值出现时间提前,燃烧后残余率均降低。碳纤维对环氧树脂热解和燃烧起到抑制作用,其点燃、放热及达到热释放速率峰值的时间延后,T300碳纤维/环氧-泡沫层合板中泡沫芯材的燃点较低,使其平均点燃时间、热释放速率峰值出现时间及CO开始释放时间提前。T300碳纤维/环氧复合材料和T300碳纤维/环氧-泡沫层合板燃烧后均出现明显的分层现象,力学性能丧失,整体结构被破坏。碳纤维的存在能够有效抑制碳纤维/环氧复合材料的热解及燃烧,并能有效抑制在燃烧过程中产生融滴、喷溅和大量黑烟。
The T300 carbon fiber / epoxy composite and T300 carbon fiber / epoxy-foam laminate (the T300 carbon fiber / epoxy composite material on the upper and lower layers and the 4 mm thick Divinycell H60 Foam core) in different fire environment combustion performance. The changing laws of combustion parameters such as ignition time, heat release rate, total amount of released fume and CO formation rate were compared and analyzed. SEM images of the surface morphology of the T300 carbon fiber / epoxy composites before and after combustion and the morphology of the charcoal layer formed by combustion of the T300 carbon fiber / epoxy composites were used to analyze the carbon fiber surface morphology in carbon fiber / epoxy composites Solution, the impact of the combustion process. The results showed that with the increase of heat radiation intensity, the average ignition time of the three experimental samples was shortened, the peak value of heat release rate and the mean value of heat release rate increased within 300s, the peak appeared ahead of time and the residual ratio decreased after combustion. Carbon fiber plays an inhibitory role in the pyrolysis and combustion of epoxy resin. Ignition, exotherm and peak time of heat release are delayed, and the ignition temperature of foam core in T300 carbon fiber / epoxy-foam laminate is lower The average ignition time, the peak time of the heat release rate and the start time of CO release are advanced. T300 carbon fiber / epoxy composites and T300 carbon fiber / epoxy - foam laminates were significantly stratified combustion, the loss of mechanical properties, the overall structure is destroyed. The presence of carbon fiber can effectively inhibit the pyrolysis and combustion of carbon fiber / epoxy composites, and can effectively inhibit the generation of melt dripping, splashing and a lot of black smoke in the combustion process.