Title: Friction performance of WC-Co coating with lithium grease and water lubrication

Authors: Songbo Wei; Xiaohan Pei; Bairu Shi; Yi Xie; Tianmin Shao; Hongfei Shang

Addresses: PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China ' PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China ' PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China ' PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China ' State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China ' State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Abstract: WC-Co coatings were sprayed by high-velocity oxygen fuel (HVOF) on bearing steels. The coating consisted of a high volume fraction of WC particles in cobalt matrix. The hardness of WC-Co coating was 60% higher than that of the bearing steel. The friction coefficients of WC-Co coating and bearing steel sliding against mild steel were tested with lithium grease and water lubrication. The friction results indicated that the friction coefficient increased with increasing loads. The friction coefficient of WC-Co coating was lower than that of bearing steels no matter with grease lubrication or with water lubrication.

Keywords: high-velocity oxygen fuel; HVOF; WC-Co coatings; hardness; friction; grease lubrication; lithium grease; water lubrication; bearing steels; tungsten carbide; cobalt; mild steel.

DOI: 10.1504/IJSURFSE.2016.076998

International Journal of Surface Science and Engineering, 2016 Vol.10 No.3, pp.272 - 281

Received: 31 Jan 2015
Accepted: 06 Apr 2015
Published online: 17 Jun 2016 *

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