Preparation and Tribological Properties of Graphene-Based Coatings on Tungsten Carbide

• Published in: Coatings (Basel) Vol. 12; no. 10; p. 1385
• Main Authors: Liu, Kun, Du, Kang-Ping, Ren, Er-Zhou, Ye, Guo-Yong, Wang, Xin-Sheng, Ming, Wu-Yi, Ma, Jun, He, Wen-Bin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.10.2022
• Subjects: Analysis; Carbon; Cemented carbides; Chemical vapor deposition; Coatings; Coefficient of friction; Composite materials; Composition; Cooling; Cooling rate; Cutting tools; Cutting wear; Ethanol; Experiments; Flow velocity; Friction; Graphene; Mechanical properties; Methane; Properties; Protective coatings; Raman spectroscopy; Tool wear; Tribology; Tungsten carbide; China
• ISSN: 2079-6412; 2079-6412
• DOI: 10.3390/coatings12101385

The preparation technology of graphene-based coatings on cobalt-based cemented carbides and the friction properties of graphene-based coatings were researched. Based on cooling rate, growth temperature, and methane flow rate, Raman spectroscopy was used to evaluate the influence of chemical vapor deposition (CVD) on graphene-based coatings. The results show that at the growth temperature of 1000 °C, the cooling rate of 15 °C/min and methane flow rate of 10 sccm are more favorable for the growth of pure graphene coating with fewer layers on a cemented carbide surface. As methane flow boosts, the number of graphene layers increases and amorphous carbon is generated. The resulting tribological properties demonstrate that the friction coefficient of graphene-based coatings decreases as the friction load increases. The above results indicate that the graphene-based coating on a cemented carbide surface can be prepared by regulating its composition and defects through technological parameters, and it is viable to use graphene-based coating as anti-wear coating for cutting tools. The results provide a reference for the preparation and properties of cemented carbide surface graphene.