The applications of carbon fibers are limited above 500 °C by their poor oxidation resistance in oxygen-containing 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.

中文翻译：

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等离子电解喷涂制备碳纤维织物上的抗氧化SiO2/SiC涂层

碳纤维在含氧气氛中的抗氧化性差，限制了其在 500°C 以上的应用。在这项研究中，通过新型等离子体电解喷涂工艺在碳纤维织物上合成了抗氧化 SiO2/SiC 涂层。研究了不同喷涂距离和不同喷涂时间制备的涂层的微观结构和性能。涂层主要由 SiO2 和 SiC 组成，SiC 含量在约 15 至 95 重量％之间变化。喷涂时间为30 s，喷涂距离为20 mm，获得最佳涂层；它对应于织物烧尽温度增加 320 °C。此外，在 900 °C 时质量损失率仅为 50% 左右，而裸碳纤维被烧毁。还研究了动力学和热力学过程，以了解这种新型等离子体电解喷雾过程。我们相信该工艺将在纤维表面改性中得到广泛的应用。