TRIBOLOGICAL BEHAVIOR OF Al–Cr COATING OBTAINED BY DGPSM AND IIP COMPOSITE TECHNOLOGY

Xixi Luo, Zhengjun Yao, Pingze Zhang, Keyin Zhou, Yu Chen and Xuewei Tao
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Xixi Luo: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, P. R. China
Zhengjun Yao: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, P. R. China
Pingze Zhang: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, P. R. China
Keyin Zhou: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, P. R. China
Yu Chen: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, P. R. China
Xuewei Tao: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 07, 1-9

Abstract: An Al–Cr composite alloyed layer composed of an Al enriched layer, a Cr enriched layer and a transition layer from the surface to the bulk along the cross-section was deposited on a 45# steel substrate by composite technology, where Cr was deposited using double glow plasma surface metallurgy (DGPSM), and Al was then implanted by ion implantation (IIP) to achieve higher micro-hardness and excellent abrasive resistance. The composite alloyed layer is approximately 5μm, and as metallurgical adherence to the substrate. The phases are Al8Cr5, Fe2AlCr, Cr23C6, Cr (Al) and Fe (Cr, Al) solid solution. The wear resistance tests were performed under various rotational speed (i.e. 280, 560 and 840r/min) with silicon nitride balls as the counterface material at ambient temperature. The Al–Cr composite alloyed layer exhibits excellent wear resistance when the speed is 280r/min with a friction coefficient as low as 0.3, which is attributed to Al8Cr5 in the Al implanted layer that withstands abrasive wear. Better wear resistance (friction coefficient: 0.254) at 560r/min is resulted from the formation of a high micro-hardness zone, and an oxidation layer with lubrication capacity. In addition, the composite alloyed layer suffers severe oxidative wear and adhesive wear at 840r/min due to the increment of the frictional heating. When compared to the 45# steel substrate, the enhanced wear resistance of the Al–Cr composite alloyed layer demonstrates the viable method developed in this work.

Keywords: Double glow plasma surface metallurgy; ion implantation; Al–Cr composite alloyed layer; wear resistance (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500913

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