PAN基碳纤维表面镀镍及高温力学性能研究

摘要

碳纤维表面镀镍不但可以有效提高碳纤维与金属液间的浸润性，而且可以避免高温状态下金属铝与碳纤维发生界面反应。基于此，对PAN基碳纤维表面镀镍和镀镍碳纤维在高温下的力学性能进行研究，探究镍层对碳纤维力学性能的影响规律。研究结果表明：碳纤维表面的金属镍层致密、均匀，与碳纤维紧密结合，表面镀镍对碳纤维束的抗拉强度影响不大；高温状态下镀镍碳纤维与氧发生反应，形成孔状结构，导致镀镍碳纤维抗拉强度随着温度的升高而逐渐减小；高温真空处理后的镀镍碳纤维可以有效保持镀镍碳纤维的抗拉强度。%Carbon fiber with Ni coating can not only effectively improve the infiltration between carbon fiber and metal fluid,but also avoid producing interface reaction between aluminum liquid and carbon fiber. Therefore,the nickel layer on the surface of PAN-based carbon fiber and the mechanical properties of nickel-plated carbon fiber at high temperature are studied to explore influence law of mechanical properties of carbon fiber by nickel layer. The results show that nickel layer on the surface of carbon fiber is dense,uniform and is integrated closely with carbon fiber. Nickel-plated PAN-based carbon fiber has little effect on tensile strength of carbon fiber. Ni-coating reacts with oxygen,and forms porous structure at high temperature,which causes tensile strength of nickel-plated carbon fiber decreasing gradually as the temperature rises. High-temperature vacuum processing nickel-plated carbon fibers can effectively maintain tensile strength of nickel-plated carbon fibers.