等离子喷涂制备石墨烯Al 2O 3+13%TiO 2自润滑涂层及其性能研究.docx

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Title: Preparation and Performance Study of Graphene-Al2O3+13%TiO2 Self-Lubricating Coatings by Plasma Spraying
Introduction:
In recent years, self-lubricating coatings have gained significant attention due to their superior tribological properties. Graphene-based coatings have shown excellent lubrication performance due to the unique structure and properties of graphene. Additionally, the addition of nanoparticles, such as Al2O3 and TiO2, can further enhance the mechanical and tribological properties of the coatings. Plasma spraying is a widely used technique for the deposition of self-lubricating coatings. This study aims to investigate the preparation and performance of graphene-Al2O3+13%TiO2 self-lubricating coatings by plasma spraying.
Experimental Method:
1. Graphene dispersion preparation: Graphene flakes were dispersed in a suitable solvent using ultrasound and mechanical agitation.
2. Coating preparation: The graphene dispersion was mixed with Al2O3 and TiO2 nanoparticles to form a homogenous suspension. The suspension was then sprayed onto a metallic substrate using plasma spraying.
3. Characterization: The prepared coatings were characterized using techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and tribological analysis.
Results and Discussion:
1. Morphology: SEM images of the coatings revealed a uniform distribution of graphene, Al2O3, and TiO2 nanoparticles. The graphene sheets were well-dispersed and formed a continuous network within the coating, which contributed to the self-lubricating behavior.
2. Phase analysis: XRD results indicated the presence of graphene, Al2O3, and TiO2 in the coatings. The addition of nanoparticles did not significantly affect the crystal structure of graphene.
3. Raman spectroscopy: Raman spectra showed the characteristic peaks of graphene, confirming its presence in the coatings.
4. Tribological properties: The friction and wear behavior of the coatings were evaluated using a pin-on-disk tribometer. The graphene-Al2O3+13%TiO2 coatings exhibited reduced friction coefficient and wear rate compared to bare metallic substrates. The self-lubricating behavior was attributed to the unique structure of graphene, which provided a low-friction interface and reduced contact between the mating surfaces.
Conclusion:
In this study, graphene-Al2O3+13%TiO2 self-lubricating coatings were successfully prepared by plasma spraying. The coatings exhibited excellent tribological properties, including reduced friction coefficient and wear rate. The addition of Al2O3 and TiO2 nanoparticles improved the mechanical properties of the coatings, while graphene provided self-lubricating behavior. The findings of this study suggest the potential application of these coatings in various industries, such as automotive and aerospace, where low friction and wear resistance are essential.
Keywords: self-lubricating coatings, graphene, Al2O3+13%TiO2, plasma spraying, tribological properties