T700/5224复合材料在湿热环境和化学介质中的老化行为

研究T700/5224复合材料在湿热环境和15#液压油、4010#合成航空润滑油、RP-3航空煤油和AHC-1水基型清洗剂4种飞机上常用的化学介质中的老化行为、实验不同时间后的吸湿量及力学性能。采用红外光谱(IR)和动态力学(DMA)分析T700/5224复合材料在介质老化过程中的化学变化和玻璃化转变温度Tg。结果表明:在80℃-85%RH的湿热环境中实验1000h后吸湿量为1.05%,在80℃-100%RH的湿热环境中实验1000h后的吸湿量为1.35%;T700/5224复合材料湿热老化后,剪切性能随老化时间变化不大,弯曲性能下降较大,开孔拉伸性能变化较大,但总体上并没有降低,而开孔压缩性能一直缓慢下降。介质老化对T700/5224复合材料的力学性能影响不大,AHC-1水基型清洗剂对其影响大于其他3种介质,T700/5224复合材料在AHC-1水基型清洗剂中浸泡45天后其玻璃转变温度Tg下降10℃。

Aging Behavior of T700/5224 Composite in Hygrothermal Environment and Chemical Media

The aging properties,absorption and mechanical properties of T700/5224 composites which were in hygrothermal environment and in 15# hydraulic oil,4010# lubricating oil,RP-3 kerosene and AHC-1 cleaner were studied.The properties'changes and Tg of the T700/5224 composite were ana-lyzed by infrared analysis (IR)and dynamic mechanical analysis (DMA).The results show that the absorption is 1.05% in environment of 80℃-85%RH,and 1.35% in environment of 80℃-100%RH. Shear strength is not changed obviously,but flexural strength decreases greatly.Open-hole tensile strength changes a lot,but on the whole,not decreases.Open-hole compression strength is always gradually decreasing.There is no evident impact on mechanical properties of composite by chemical solutions.The effect of AHC-1 cleaner on T700/5224 composite is bigger than the other three media, Tg declines 10℃ after soaking in AHC-1 cleaner for 45 days.