树脂基复合材料的分解防热效率

为了提高树脂基复合材料烧蚀中的热阻塞效应,同时避免因为加入过量树脂引起的复合材料脆性较大的问题,本文提出了引入可分解纤维改性的方法来解决这一矛盾.通过比较,筛选出了分解性质与酚醛树脂相似的可分解纤维,制备了改性纤维/酚醛复合材料.电弧风洞烧蚀试验结果显示,20 mm厚的改性纤维/酚醛在最高热面温度1 300℃、总加热时间600 s的条件下背面温升比相同条件下高硅氧/酚醛低约40℃,表现出很好的烧蚀防热性能,与材料设计的初衷相符.因此,引入可分解纤维的方法是一种有效改善复合材料性能的方法.

Heat-Resistant Effect of Pyrolysis of Resin Composites

For improving heat-obstructive effect and avoiding brittleness from increasing phenolic resin,a novel reformative method was thought out and carried into execution.A kind of pyrolysis fiber showed the similar decomposition characteristics as phenolic resin.A typical sample was produced according to the modified principle and tested.Arc heated wind tunnel experimental results indicated that the back temperature of 20 mm new composite was lower about 40℃ than high silicon/phenolic under the same test condition(The highest surface temperature was 1 300℃ and the total heating time was 600 s).The new composite showed excellent heat-obstructive effect and the results were consistent with the original objective.The novel reformative method was perspective on improving the heat-obstructive effect.