论文部分内容阅读
为研究碳纤维环氧复合材料的火灾特性,用锥形量热仪等仪器,对单向碳纤维预浸料、双向碳纤维布和碳纤维夹层板等3种典型材料进行试验,测定其燃烧速度、极限氧浓度、热释放速率(HRR)、失重率等性能参数,分析其热稳定性和燃烧特性。结果表明,点燃位置对材料的火焰传播速度影响较大,底部点燃时燃烧速度较快;泡沫芯材受热易形成炭层,炭层能降低火焰传播速度、增大极限氧浓度;泡沫芯材在较低温度下就会受热分解,其点燃时间、达到HRR峰值时间、热解和放热时间均提前;当采用相同环氧体系时,织造方式对碳纤维复合材料燃烧性能和热稳定性能影响不大。
In order to study the fire characteristics of carbon fiber epoxy composites, three kinds of typical materials, such as unidirectional carbon fiber prepreg, bidirectional carbon fiber cloth and carbon fiber sandwich panel, were tested with cone calorimeter and other instruments. The combustion rate, Concentration, heat release rate (HRR), weight loss rate and other performance parameters, analysis of its thermal stability and combustion characteristics. The results show that the ignition position has a great influence on the flame propagation velocity of the material, and the combustion speed at the bottom is relatively fast. The foam core is easily heated to form a carbon layer which can reduce the flame propagation velocity and increase the limiting oxygen concentration. At lower temperature, it will decompose thermally, its ignition time will reach HRR peak time, and the pyrolysis and exothermic time will advance. When using the same epoxy system, the weaving mode has little effect on the combustion performance and thermal stability of carbon fiber composites .