Oxidation-Resistant SiO 2 /SiC Coatings on Carbon Fiber Fabrics Prepared by Plasma Electrolysis Spray
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Oxidation-Resistant SiO2/SiC Coatings on Carbon Fiber Fabrics Prepared by Plasma Electrolysis Spray Aiming Bu1 • Yongfu Zhang1 • Yan Xiang1 • Yunjie Yang1 • Jingyu Deng1 Junliang Shi2 • Weiwei Chen1 • Huanwu Cheng1 • Lu Wang1
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Submitted: 15 April 2020 / in revised form: 28 May 2020 ASM International 2020
Abstract The applications of carbon fibers are limited above 500 C by their poor oxidation resistance in oxygencontaining atmosphere. In this study, oxidation-resistant SiO2/SiC coatings were synthesized on carbon fiber fabric by a novel plasma electrolysis spray process. The microstructure and properties of coatings prepared at different spray distances and different spray times were investigated. The coatings were mainly composed of SiO2 and SiC with a SiC content varying between about 15 and 95 wt.%. The optimal coating was obtained with a spray
time of 30 s and a spray distance of 20 mm; it corresponded to an increase in the fabric burnt-out temperature by 320 C. Additionally, the mass loss rate was only around 50% at 900 C, while the bare carbon fiber was burnt out. The kinetics and thermodynamics processes were also investigated in order to understand this novel plasma electrolysis spray process. We believe that this process will find a wide range of applications in the surface modification of fibers.
& Aiming Bu [email protected] Weiwei Chen [email protected] 1
Department of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2
Yangfan Group Co. Ltd, Zhengjiang 316100, China
123
J Therm Spray Tech
Graphic Abstract
Keywords carbon fiber fabric electrolytic plasma spraying nano-SiO2/SiC coating oxidation-resistant coatings
Introduction Carbon fiber has been one of the potential candidates in various applications, owing to its superior properties, high specific modulus, low density, good thermal stability and high shock resistance (Ref 1, 2). In recent years, there has been increasing interest in the development and research of carbon fiber. Particularly, carbon fiber can be applied in high temperatures (3000 C) under inert atmospheric condition. Nevertheless, the applications are strongly limited by its poor oxidation in an oxygen-containing atmosphere above 500 C (Ref 3-7). The problem can be overcome by depositing an oxidation-resistant coating in order to protect carbon fiber from oxidation and mass loss, thereby maintaining its mechanical properties. The ceramic coating acts as a diffusion barrier for oxygen, which improves the oxidation resistance of carbon fiber and widens its application areas (Ref 8-11). A silicon-based ceramic coating has good thermophysical properties with low oxidation rates and becomes an attractive high-temperature oxidation-resistant material (Ref 12, 13). Among them, the SiO2/SiC coating is considered to be one of the most effective coatings to protect carbon fiber from oxidation at high temperatures. The SiO2/SiC coating has high thermal stability, low density, high strength, high hardness and erosi
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