热处理对短碳纤维表面镍磷涂层形貌和结构的影响

Influence of heat treatment for nickel-phosphorous coating's morphology and structure on the short carbon fibers

对不同工艺条件下所得的碳纤维表面化学镀镍涂层进行热处理,利用SEM和XRD对热处理前后镀层形貌、物相组成及微观结构的变化进行了分析比较。实验结果表明,热处理对镀层形貌影响明显;镀层的存在对碳纤维的微结构并未造成影响;热处理后镀层的晶粒较未热处理增大近3倍,并且镀层结晶度提高近1倍;550℃热处理后镀层物相组成由初始的沿(111)晶面择优取向的金属Ni和少量的P转变为无序取向的Ni和Ni3P。

The electroless nickel coatings obtained under different process conditions on the carbon fiber surface were heated treatment.The coating morphology,phase composition and microstructure changes were analyzed and compared by using SEM and XRD.There is obvious impact of heat treatment on coating morphology and the coating has no effect on the micro-structure of carbon fiber;after heat treatment the grain size of metal nickel （111） crystal plane in the coating is nearly three-fold larger than the non-heat-treatment and the crystalline increase nearly doubled.After 550℃ high temperature treatment the coating＇s phase composition changed from the initial along the （111） crystal plane preferred orientation of metal Ni and a small amount of P into disorder-oriented Ni and Ni3P.