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Improvement of the mechanical and oxidation resistance of pyrolytic carbon coatings by co-deposition synthesis of pyrolytic carbon-silicon carbide nanocomposite
Thin Solid Films ( IF 2.1 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.tsf.2020.138320
Mohammad Yousefi , Meysam Maleki Rahim-abadi

Abstract In this work, pyrolytic carbon- silicon carbide (PyC-SiC) nanocomposites were prepared via pyrolysis of Trimethylsilyl chloride (TMSCl) as precursor using chemical vapor deposition method at high temperature (1100 oC). The nanocomposite of PyC-SiC was synthesized by the deposition of SiC and PyC components from the stream of nitrogen as carrier gas by the co-deposition method. The effect of substrate type and TMSCl concentration on microstructure, composition, thermal properties, and mechanical behavior were investigated. The formation of PyC-SiC nanocomposites was followed by Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction. Scanning electron microscopy was used to study of nanocomposite morphology. Additionally, the amount and distribution of Si element in the PyC-SiC nanocomposites was determined by energy dispersive X-ray mapping. The results showed that the nanocomposite containing higher SiC content was synthesized by TMSCl at 2.5 vol% on graphite. Furthermore, the results of thermogravimetric analysis and wear resistance (via tribometer) showed that the oxidation and wear resistance of nanocomposites increased with an increase in the amount of embedded silicon in the nanocomposites. Oxidation temperature and wear resistance of prepared nanocomposites in comparison with PyC increased to about 100 oC and 300%, respectively. The tribology results showed that the friction coefficient of nanocomposites increases about 25–300% with increasing TMSCl concentration. Finally, the results of the nanoindentation test showed that increasing the amount of SiC embedded in nanocomposites improved the elastic modulus and hardness of nanocomposites about 180% and 100%, respectively.

中文翻译:

通过共沉积合成热解碳-碳化硅纳米复合材料提高热解碳涂层的机械和抗氧化性

摘要 在这项工作中,采用化学气相沉积法在高温 (1100 oC) 下,以三甲基氯硅烷 (TMSCl) 为前驱体,热解制备了热解碳-碳化硅 (PyC-SiC) 纳米复合材料。PyC-SiC 纳米复合材料是通过共沉积方法从氮气流作为载气中沉积 SiC 和 PyC 组分来合成的。研究了底物类型和 TMSCl 浓度对微观结构、成分、热性能和机械行为的影响。通过拉曼光谱、傅里叶变换红外光谱和 X 射线衍射跟踪 PyC-SiC 纳米复合材料的形成。扫描电子显微镜用于研究纳米复合材料的形貌。此外,PyC-SiC 纳米复合材料中 Si 元素的数量和分布是通过能量色散 X 射线映射确定的。结果表明,在石墨上以 2.5 vol% 的 TMSCl 合成了含有较高 SiC 含量的纳米复合材料。此外,热重分析和耐磨性(通过摩擦计)的结果表明,纳米复合材料的氧化和耐磨性随着纳米复合材料中嵌入硅量的增加而增加。与 PyC 相比,制备的纳米复合材料的氧化温度和耐磨性分别提高到约 100 oC 和 300%。摩擦学结果表明,随着 TMSCl 浓度的增加,纳米复合材料的摩擦系数增加了约 25-300%。最后,
更新日期:2020-11-01
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