He Jinmei

Investigation on atomic oxygen erosion resistance of self-assembly film at the interphase of carbon fiber composites

This paper proposes a new method based on molecular self-assembly on carbon fiber surface in order to improve atomic oxygen erosion resistance for the interface of carbon fiber/epoxy composites. The self-assembly films were characterized by surface-enhanced Raman scattering and X-ray photoelectron spectroscopies. The results indicated that two aromatic thiols indeed chemisorbed onto the Au-plated carbon fiber surfaces in the form of thiolate species via the strong S-Au coordination bond and well-organized with a flat orientation structure. From interfacial shear strength data and atomic force microscopy observation, it is noticed that, after carbon fiber surfaces were assembled with 4-hydroxythiophenol and 4-aminothiolphenol, the atomic oxygen erosion resistance were better than that of untreated and Au-plated carbon fiber/epoxy micro-composites, especially, the micro-composites modified by 4-aminothiolphenol. It will be an effective solution to the two major issues of enhancement of interfacial bonding force and interfacial atomic oxygen erosion resistance.

Study on Atomic Oxygen Erosion Resistance for the Interface of Carbon Fiber/Epoxy Composites

This study proposes a method of improving the ability of atomic oxygen (AO) erosion resistance for the interface of carbon fiber/epoxy (CF/EP) composites by means of plating gold (Au) on CF surface. Tests of scanning electron microscopy (SEM) and atomic force microscopy (AFM) indicate that Au coating, with the thickness of about 50 nm is dense, uniform and complete, and has good adhesion to the CF substrate. Interfacial shear strength (IFSS) of single-fiber microcomposites made from CF and EP before and after AO exposure is measured by single-fiber pull-out instrument. The results show that the IFSS of the single-fiber microcomposites, which are protected by Au coating is hardly affected by AO for long time exposure of 8 h, in contrast to those which are not protected with Au coating, whose IFSS decreased dramatically for an AO exposure time of 2 h.This study proposes a method of improving the ability of atomic oxygen (AO) erosion resistance for the interface of carbon fiber/epoxy (CF/EP) composites by means of plating gold (Au) on CF surface. Tests of scanning electron microscopy (SEM) and atomic force microscopy (AFM) indicate that Au coating, with the thickness of about 50 nm is dense, uniform and complete, and has good adhesion to the CF substrate. Interfacial shear strength (IFSS) of single-fiber microcomposites made from CF and EP before and after AO exposure is measured by single-fiber pull-out instrument. The results show that the IFSS of the single-fiber microcomposites, which are protected by Au coating is hardly affected by AO for long time exposure of 8 h, in contrast to those which are not protected with Au coating, whose IFSS decreased dramatically for an AO exposure time of 2 h.