用Weibull统计方法评价Ni-P镀层对炭纤维抗拉强度的影响

摘要: 采用化学镀法获取NiP镀层炭纤维。通过SEM和XRD考察了未镀和已镀NiP炭纤维表面形貌和微观结构的变化，借助EDS研究了其表面元素的变化，利用Weibull统计分布探讨了NiP镀层对炭纤维单丝抗拉强度的影响。结果表明：NiP镀层使炭纤维表面缺陷减少，外界应力经过NiP镀层向纤维传递，改变了炭纤维的断裂机理。当镀层厚度为0.149μm时，抗拉强度达到最大值3.10GPa，比未镀的增加8.77%，说明NiP镀层能够提高炭纤维抗拉强度。

Abstract: Ni-P coated carbon fibers were prepared by a chemical plating method. The microstructures of uncoated and coated carbon fibers were investigated by SEM and XRD, and the surface atom compositions were studied by EDS. The tensile strength of the carbon fibers was analyzed by a Weibull statistical method. Results show that the number of defects on the carbon fiber surfaces decreases after Ni-P coating. When the thickness of the NiP coating reaches 0.149μm, the tensile strength of carbon fibers exhibits a maximum value of 3.10GPa, a 8.77% increase compared to the uncoated carbon fibers, which might be ascribed to the elimination of a number of surface defects by the NiP coating.