飞机油箱用典型复合材料热传导性能实验研究

Experimental study on heat-conducting performance of typical ACM used in aircraft fuel tank

飞机油箱已开始探索使用先进复合材料,以T300 3K碳纤维环氧树脂复合材料为研究对象,通过接触式恒温加热实验和热导率测试实验,对其导热性能进行了研究。首先对厚度为2 mm、4 mm的T300 3K碳纤维环氧树脂复合材料板分别进行150℃、200℃、250℃、300℃以及350℃的接触式恒温加热实验;然后在实验条件下测得了T300 3K在不同温度下的热导率,并与5A02铝合金材料在不同温度下的热导率进行了比较。研究结果表明:T300 3K的热导率远小于5A02铝合金,其垂直于纤维方向的热导率在10^(-2)数量级,且随着温度的升高而变大;T300 3K作为飞机燃油箱壁板材料虽然隔热性能强于5A02铝合金,但易出现局部过热的情况,造成材料板破坏,强度出现下降。

ACM （advanced composite m aterials） has been used in aircraft fuel tanks. H eat-conducting performances ofcarbon fiber epoxy composite T300 3K are studied through the following experiments： contact constant-tem peratureheating experiment and thermal conductivity test experiment. Contact constant-tem perature heating experimentsare firstly taken on 2 mm and 4mm thick T300 3K carbon fiber epoxy composites at the temperature of 150℃, 200 ℃, 250 ℃, 300 ℃ and 350 ℃. Then, the thermal conductivities of T300 3K are tested at differenttemperatures under the presupposition experimental conditions. Those results are compared with the thermalconductivities of 5A02 aluminum alloy material at different temperatures. Research results show that the thermalconductivities of T300 3K is much smaller than that of 5A02 aluminum alloy. In vertical direction to the fiber,the thermal conductivity of T300 3K keeps in 10^-2 magnitude. And it becomes larger with the increase of temperature.As aircraft fuel tank panel material, T300 3K is easy to occur in the case of local overheating, causing materialdamage, and resulting in the decrease of its strength, although the thermal insulation performance ofT3003K is stronger than 5A02 aluminum alloy.