碳铜复合材料的界面特征及力学性能

Interface Characteristics and Mechanical Properties of Carbon Fiber Reinforced Copper Composites

研究了三种不同界面结合状态(机械结合、溶解结合、反应结合)的碳纤维增强铜复合材料的界面结构及其对复合材料弯曲强度的影响。在一定程度上,提高界面结合强度将显著增加复合材料的弯曲强度,避免碳纤维在低应力下拔出。随着界面结合强度的增加,复合材料的断口由纤维拔出型向纤维平状断口转变。在提高界面结合强度的同时,必须控制界面反应和溶解的程度,防止碳纤维被严重的反应或溶解“侵蚀”。

Interface characteristics of carbon fiber reinforced copper matrix composite materials with various interface states and their effect on the flexural strength of the composites had been studied. The interface states are of mechanical bonding, dissolution bonding and reaction bonding. To certain extent, raising the interfacial strength is able to increase the flexural strength due to preventing carbon fiber being pulled out in low stress during fracture process of the composites. With raising the interfacial bondage strength, the brittleness of the composites increases, the fracture surface of the composites is converted from fiber pull-out model to fiber even model. while strengthening the interface bondage, the extent of chemical reaction and dissolution at interface must be controlled to avoid degrading carbon fiber.