Factors affecting SiC–ZrO₂–MoSi₂/Ni antioxidation coating made by composite plating on carbon fibres

Abstract

Carbon fibres (CF) have been used in various fields because of their unique properties. However, the oxidation resistance ability of CF is not good enough. The paper discusses the issue of using composite plating method to deposit SiC-MoSi 2 -ZrO 2 coating at the surface of CF. The plating factors, including nanoparticle concentration, plating bath temperature, current density, agitation rate and electroplating time, which affect the structure and performance of coating have been discussed. The energy dispersive spectrometer has been applied to test the mass fraction of nanoparticles in the coating. Also, the surface morphology of coated CF has been characterised by a scanning electron microscope and the antioxidation ability of each sample has been tested by the weight difference method. The results indicate that with the proper plating factors, the coating can improve the antioxidation performance of CF and its reinforced composites. The residual weight of coated CF is over 52% after 1400°C oxidation for 15 min.

Preparation and oxidation behaviour of MoSi2-SiC-Si-ZrB2 composite coatings on carbon surface via laser cladding

“…The ZrB 2 reacted with O 2 to generate ZrO 2 and B 2 O 3 , and oxidation of SiC and Si occurred as well with O 2 to form their corresponding oxides. In addition, in the early stage of laser ablation, when the temperature was between 400 and 800°C , a 'pesting' reaction of MoSi 2 began to take place and oxidation products of MoO 3 and SiO 2 were formed [22]. The MoO 3 phase produced by this reaction has poor mechanical properties, and was easy to volatilise and form holes, which affected the coating performance.…”

C/SiC composite coatings with ultra-high thermal emissivity

“…Therefore, it is widely used as a multi-functional, protective coating in various fields [2][3][4]. Especially, when SiC coatings are oxidized under elevated temperatures, they tend to transform to SiO 2 , which can further improve the coating's anti-oxidation properties and thermal emissivity [5]. Since carbon materials are typical blackbody radiation materials, it can be expected that C/SiC composite coatings can further enhance the thermal emissivity of SiC coating.…”