Research on the Microstructure and Tribological Properties of the Electroless Ni-P-PTFE Composite Repairing Coating on Gears

• DOI: 10.4028/www.scientific.net/amm.327.136
• Publication Date: 2013-06-13T14:24:52Z
• Authors: Nan Jiang; Chuan Qi Fu; Zhou Wang
• Keywords: 02 engineering and technology; 0210 nano-technology

The abrasion of axle parts would shorten their useful life, which could be significantly ameliorated to improve the wear resistance of gears through surface repairing and lower production cost. In this work, preparation technology of electroless Ni-P-PTFE composite repairing coatings on 45# carbon steel was investigated by the method of cerium induced codeposition. Coatings with PTFE ranging of 0-10g/L and Ce2+ of 0-1.0g/L were obtained. SEM and XRD were employed to study the worn surface topography, wear mechanism and microstructure of the coatings, respectively. The results indicate that the PTFE particles uniformly distributed throughout the Ni-P matrix, on the edge position of Ni-P crystal cells, and small amounts of which were wrapped in the crystal cells. The wear mechanism manifested as adhesion and slight grain-abrasion, along with associated ploughed grooves. It was also demonstrated that the wear rate of deposits is 2×10-6mm3.N-1.m-1 in condition of dry sliding, which is smaller than it by 3 orders of magnitude. Obviously, electroless Ni-P-PTFE coating improves the wear resistance of gears significantly and can be used as repairing coating.