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An anodic oxidation treatment method is developed in this paper which is capable of modifying the surfaces of carbon fibres in three-dimensional (3D) braided fabrics conveniently and uniformly. The results on the utilisation of this method in the surface treatment of 3D carbon fibre braided fabrics are presented. The effects of anodic oxidation treatment of 3D fabrics on the properties of phenolic resin composites are analysed and discussed. By appropriate treatment, the interfacial shear strength and compressive strength may be improved by 20% and 59 . 3% respectively. As far as the impact properties of the composites are concerned, the crack initiation energy was increased and the crack propagation energy decreased. Concerning ablative properties of the composites, the linear ablative rate was decreased by 10 . 7% and the maximum temperature of the underside of the ablative section was reduced by 2 . 7%.MST/4901

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A novel epoxy/SiO2 hybrid sizing for carbon fiber surface was prepared through sol-gel technique, the structure of the sizing were analyzed, and the effects of the sizing on mechanical properties of carbon fiber composites were also investigated. The analyses by FT-IR and SEM indicated that epoxy/SiO2 hybrid sizing was prepared successfully, SiO2 particles dispersed in the hybrid sizing film homogeneously with nanoscale. The analyses on interlaminar shear strength (ILSS) and impact properties of composites showed that the epoxy/nano-SiO2 hybrid sizing increased ILSS and improved impact properties obviously at the same time.

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