Research on Microstructure and Tribological Properties of the Cp/AlSn Coatings Deposited by Magnetron Sputtering

Abstract:

The influences of microstructure and tribological properties of Cp/AlSn (Cp: carbon particule) composite films were applied to AlZn4.5Mg bearing alloy substrates using the closed-field unbalanced magnetron sputtering ion plating technique. The microstructure, phases and bond states of the coatings were separately characterized by X-ray diffraction (XRD), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The friction coefficients were measured using a pin-on-disc set-up. Results showed that the grain size and roughness of the films both decreased with increasing of carbon target current (I_C) from 0.2 A to 0.8 A. Phases in the films were Al, Sn and C, although the films transformed from a crystalline state to amorphous when the carbon target current was applied. Al and Sn existed as pure metals. Carbon, composed of sp² and sp³ bonds, mainly as sp² bonds, provided transfer films to reduce the friction coefficient of the films from 0.35 to 0.15. The specific wear ratio was a minimum, when the carbon target current was 0.4 A.

• Periodical: Materials Science Forum (Volume 765)
• Pages: 703-707
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.765.703
• Online since: July 2013
• Authors: Qiao Qin Guo, Jian Ping Li, Yong Chun Guo
• Keywords: Cp/AlSn, Magnetron Sputtering, Microstructure, Tribological Property, XPS

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