Preparation of Nano-SiO{sub 2}-Coated Graphite Films by a Laser-Assisted Sol–Gel Process

Journal Article · Thu Aug 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04201-0· OSTI ID:22970584

Luo, Fang ^[1]; Du, Linlin ^[2]; He, Zhen; Wang, Yuxin ^[3]; Lu, Xiangang; Ye, Chen; Hu, Xiaodong ^[2]

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1. Zhejiang University of Technology, College of Zhijiang (China)
2. Zhejiang University of Technology, Institute of Laser Advanced Manufacturing (China)
3. Jiangsu University of Science and Technology, Department of Materials Science and Engineering (China)

Here, we prepared nano-SiO{sub 2}-coated graphite films using a novel laser-assisted sol–gel method. The SiO{sub 2} sol–gel prepositioned on the graphite substrate was irradiated by the fiber laser at different energy densities. The growth mechanism of the coatings under laser irradiation was studied and the effects of processing parameters on the coating structure were systematically investigated. In addition, the high-temperature oxidation resistance of these samples was examined. Surface morphology and elemental composition were examined using scanning electron microscopy and energy-dispersive spectrometer. Phase constituents and microstructure were identified by x-ray diffraction and transmission electron microscopy. The oxidation resistance was analyzed by thermal gravimetric analysis. The results found that laser irradiation significantly modifies the sol–gel-deposited nano-SiO{sub 2} layer. A uniform and compact nano-SiO{sub 2} coating was obtained when irradiated by laser energy density of 14.4 kJ/cm{sup 2}. Optimum high-temperature oxidation resistance was achieved for the two-layer SiO{sub 2}-coated films.

• OSTI ID: 22970584
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 8 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COATINGS
CRYSTAL GROWTH
DEPOSITS
ENERGY DENSITY
FILMS
GRAPHITE
IRRADIATION
LASER RADIATION
OXIDATION
PROCESSING
SCANNING ELECTRON MICROSCOPY
SILICA
SILICON OXIDES
SOL-GEL PROCESS
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION