低热通量下碳纤维/环氧树脂层合板的燃烧特性

Combustion Characteristics of Carbon Fiber/Epoxy Laminates at Low Heat Flux

使用锥形量热仪研究了35 kW/m^2热通量下碳纤维/环氧树脂层合板的点燃时间、质量损失速率、热释放速率等燃烧特性参数与其厚度的关系,建立了热穿透深度的数学模型以得到不同厚度层合板的热穿透深度、判别层合板的热厚热薄特性并分析燃烧过程。结果表明:在低热通量下,随着碳纤维/环氧树脂层合板厚度的增加其点燃时间延长、平均质量损失速率和质量损失速率峰值下降、总释放热量增大、热释放速率峰值先增大后减小;碳纤维/环氧树脂层合板在点燃时表现为热薄型或是热厚型,与其物理厚度有直接关系。热厚型材料有一个由热厚型向热薄型转变的热响应过程。

The combustion characteristics of carbon fiber/epoxy laminates were investigated by means of cone calorimeter at 35 k W/m2 heat flux in terms of ignition time,mass loss rate,heat release rate etc.The mathematical model of thermal penetration depth was established in order to acquire the relation of thermal penetration depth of materials with their thickness,which was a reference to differentiate the carbon designed fiber/epoxy laminate either as‘thermally thin’or‘thermally thick’-type,and analyze the combustion process of laminates.The results show that with the increase of thickness of carbon fiber/epoxy resin laminate the ignition time increases,the average mass loss rate and the mass loss rate peak decrease,the total heat release increases,and the peak heat release rate increases first and then decreases.It follows that the carbon fiber/epoxy resin laminates present burning behavior as either‘thermally thin’or‘thermally thick’-type may be depend upon its own physical thickness when it is ignited,and‘thermally thick’material has a changing thermal response process from‘thermally thick’to‘thermally thin’-type during the combustion process.