Al2O3 + Graphene Low-Friction Composite Coatings Prepared By Sol–Gel Method

Coatings

Marcin Szymański¹  Sebastian Miszczak¹  Bożena Pietrzyk¹  Ye Sun² 

[1] Institute of Materials Science and Engineering, Faculty of Mechanical Engineering, Lodz University of Technology, Stefanowskiego Str. 1/15, 90-924 Lodz, Poland;Wanhua Research Institute (NERP), NO. 59. Chongqing Road, Yantai 264006, Shandong, China;

关键词: ceramic coating;    alumina coating;    sol–gel;    composite coating;    graphene oxide;    graphene nanoplatelets (GNP);   

DOI  :  10.3390/coatings10090858

来源: DOAJ

【 摘 要 】

In this work, Al₂O₃ + graphene coatings were prepared using the sol–gel method. The aim of the study was preliminary determination of the influence of size and amount of graphene nanoplatelets on morphology, chemical structure, and basic tribological properties of Al₂O₃ + graphene composite coatings. Two types of reduced graphene oxide (rGO) nanoplatelets with different lateral size and thickness were used to prepare the coatings. To characterize them, scanning electron microscope (SEM), glow discharged optical emission spectrometer (GDOES), Fourier-transform infrared (FTIR), reflectance spectrometer, and ball-on-disk tribological tests were used. It was found that the presence of graphene in the Al₂O₃ + graphene coatings did not fundamentally change the chemical transformation of ceramic Al₂O₃ matrix. Morphology examinations of coatings containing larger graphene nanoplatelets revealed a tendency to their parallel arrangement in relation to the coated surface. The tribological properties of Al₂O₃ + graphene coatings turned out to be strongly dependent on the size of graphene nanoplatelets as well as on the heat treatment temperature. The friction coefficient as low as 0.11 and good durability were obtained for the Al₂O₃ + graphene coating with larger nanoplatelets and heat-treated at 500 °C. The results of conducted research indicate the potential use of Al₂O₃ + graphene composite coatings prepared by the sol–gel method as low-friction ceramic coatings.

【 授权许可】

Unknown