Tribological properties of surface modified Cu nanoflakes prepared by plasma assisted ball milling

• Published in: Cai liao gong cheng = Journal of materials engineering Vol. 47; no. 6; pp. 114 - 120
• Main Authors: Ji, Guang-pu, He, Xiu-fang, Liao, Hai-feng, Dai, Le-yang, Sun, Di, Cai, Gu-chang
• Format: Journal Article
• Language: Chinese
• Published: Beijing Beijing Institute of Aeronautical Materials 01.06.2019; Journal of Materials Engineering
• Subjects: Ball milling; Chemical bonds; Copper; Cu nanoflake; Deformation effects; Flakes; Friction reduction; Lubricants; Lubrication; Maintenance; Organic chemistry; Plasma; plasma assisted ball-milling; Plastic deformation; Stearic acid; Superplasticity; surface modification; Synergistic effect; tribological property; Tribology; Wear resistance
• ISSN: 1001-4381; 1001-4381
• DOI: 10.11868/j.issn.1001-4381.2018.000277

Surface modified nano-flake Cu powder was prepared by plasma assisted ball milling by adding stearic acid as a process agent and its tribological properties were tested. The results indicate that the Cu particle exhibiting an excellent superplasticity has severe plastic deformation induced by a synergistic effect of plasma high-rate heating and electroplasticity, and the 20nm-thick flake-like Cu particles are obtained after 5h milling time of plasma milling. These nano-flake Cu particles owning oleophobicity characteristics exhibit good dispersion in the 40CA marine lubricating oil due to that the surface of Cu nano-flake adsorbs and chemically bonds with some non-polar groups under the plasma assisted ball milling with stearic acid. The severe deformation of the nano-flake Cu particles displaying high activation are easily adsorbed and spread on the surface of the friction counterpart in the process of sliding, which promotes a better wear resistance for compound lubricant with nano-flake Cu addition. Under