Abstract SiC coating was deposited on carbon/carbon (C/C) composites by chemical vapor deposition (CVD). The effects of elevated temperatures on tribological performance of SiC coating were investigated. The related microstructure and wear mechanism were analyzed. The results show that the as-deposited SiC coating consists of uniformity of β-SiC phase. The mild abrasive and slight adhesive wear were the main wear mechanisms at room temperature, and the SiC coating presented the maximum friction coefficient and the minimum wear rate. Slight oxidation of debris was occurred when the temperature rose to 300 °C. As the temperature was above 600 °C, dense oxide film formed on the worn surface. The silica tribo-film replaced the mechanical fracture and dominated the frication process. However, the aggravation of oxidation at elevated temperatures was responsible for the decrease of friction coefficient and the deterioration of wear rate. The SiC coating presented the minimum friction coefficient and the maximum wear rate when the temperature was 800 °C.

中文翻译：

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碳/碳复合材料碳化硅涂层在高温下的摩擦学性能

摘要 通过化学气相沉积 (CVD) 在碳/碳 (C/C) 复合材料上沉积 SiC 涂层。研究了高温对碳化硅涂层摩擦学性能的影响。分析了相关的微观结构和磨损机理。结果表明，沉积态的 SiC 涂层由均匀的 β-SiC 相组成。常温下轻度磨粒磨损和轻微粘着磨损是主要的磨损机制，碳化硅涂层的摩擦系数最大，磨损率最小。当温度升至 300 °C 时，碎片发生轻微氧化。当温度超过600℃时，磨损表面形成致密的氧化膜。二氧化硅摩擦膜取代了机械断裂并主导了摩擦过程。然而，高温氧化加剧是摩擦系数降低和磨损率恶化的原因。当温度为 800 ℃时，碳化硅涂层表现出最小的摩擦系数和最大的磨损率。