湿热循环对CCF300/QY8911复合材料界面性能的影响

摘要

The specimens of CCF300/QY8911 composite are treated with cyclical moisture absorption-desorption processes. The curves of moisture absorption and desorption are drawn and are fitted in the Fick Second Law. Interfacial properties are characterized with the method of the interlaminar shear strength (ILSS), and cross-section and lateral morphologies are observed by SEM. The results indicate that the behaviors of moisture absorption and desorption of specimens are in accordance with Fick Second Law, with the moisture immersion for 14d at 71℃ , the samples obtain the saturated moisture absorption contents; Absorption moisture has reversible and irreversible destructive effect on of CCF300/QY8911 composite. Reversible damage on fiber/resin interfaces can be eliminated after desorption processing, which increases the dry ILSS; the increase of hygrothermal cycles can lead to further irreversible damage on the fiber/resin interfaces and make the ILSS of CCF300/QY8911 composite decrease. However, the absorption moisture is the key factor which causes the degradation of ILSS performance.%通过对CCF300/QY8911复合材料试样进行循环吸湿-脱湿处理,绘制吸湿和脱湿曲线并用Fick第二定律进行拟合,采用层间剪切强度(ILSS)表征不同湿热条件对纤维/树脂界面性能的影响,再通过SEM观察试样剖面和侧面的微观形貌.结果表明:CCF300/QY8911复合材料的吸湿和脱湿行为符合Fick第二定律,试样水浸(水温71℃)14天后达到饱和吸湿率；水对CCF300/QY8911复合材料纤维/树脂界面的破坏分为可逆和不可逆,脱湿处理会消除可逆破坏,使干态ILSS有所回复；湿热循环次数增加会进一步引起纤维/树脂界面产生不可逆破坏,使CCF300/QY8911复合材料ILSS降低,但吸湿是引起这种复合材料ILSS性能下降的主要因素.