| In this paper, latitudinal tabby carbon fiber cloth weaved by 1K acrylic fiber was used as reinforcement, whose surface was firstly modified by electroless nickel plating, then treated by plasma spray of Al3%wt+Ni97%wt micro powders on both sides with thickness of hundreds of microns. Subsequently, Hot Isostatic Pressing (HIP) and Vacuum Hot Pressing (VHP) were performed to densify the material and finally carbon fiber reinforced nickel base composite with 25.7～32.8vol.% fiber was prepared.Electroless plating was used to increase the infiltration and prevent the reaction between Ni and carbon fiber. Both the treatment before the electroless plating and the composition of the plating agent were investigated. And eventually we successfully got compact plating layer with low phosphorus.Scanning Electron Microscope (SEM), X-ray fluorescence analysis (XRF), X-ray Photoelectron Spectroscopy (XPS), X-ray diffraction, Differential Scanning Calorimetry(DSC), Energy Difusion Spectrum(EDS) and high-temperature stretcher were used to study morphology, microstructure, phase composition, and mechanical properties of carbon fiber reinforced Ni-base composites, so as to improve the technique and optimize the Composition of plating agent of electroless nickel plating on carbon fibers. We also prepared carbon fiber reinforced composite without plating layer for comparison.It was found that interfacial strength of composite with modified carbon fiber is much better than that of composite reinforced by untreated carbon fiber. Three characteristics in terms of the treated composite were revealed: a. Al2O3 phase was detected by XRD and EDS analysis, which brought brittleness to this material; b. the process of HP may seriously damage the carbon fibers inside the composite; c. The tensile strength at high temperature was not good, mainly due to the damage of carbon fiber caused by HP at high temperature, and also because there were many flaws such as micropores inside the matrix.
|
PDF Full Text Request