碳纤维表面处理对单向C/C复合材料强度的影响

Effect of Fiber Surface Pretreatment on the Tensile Strength of Unidirectional Carbon-Carbon Composites

通过对碳纤维表面进行适当的氧化处理 ,改善纤维 /基体之间的界面结合 ,能在复合材料中得到较好的纤维强度利用率 ,提高材料性能。本文在不同条件下对碳纤维进行液相氧化和空气氧化处理 ,并测定了所制备的单向 C/C复合材料的强度 ,研究了不同氧化工艺条件对复合材料拉伸强度的影响 ,对采用氧化后纤维制备材料断裂机制的改变进行了讨论 ;研究发现液相氧化处理对 C/C复合材料的性能影响较为显著。

The key factor that determines the properties of carbon/carbon composites (C/C) is the fiber/matrix interface strength. To obtain the good utilization of the carbon fiber tensile strength, the fibers were heated in the air at 340° and 420°, and then immersed in liquid oxidant up to 30 hours. The results show that liquid oxidant is the preferable candidate to adjust the interface properties such as the interfacial morphology, structure and composition.