Microstructure and properties of a wear resistant Al-25Si-4Cu-1Mg coating prepared by supersonic plasma spraying
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Microstructure and properties of a wear resistant Al–25Si–4Cu–1Mg coating prepared by supersonic plasma spraying Tian-shun Dong 1,2),*, Ming Liu 3), Yang Feng 1),*, Guo-lu Li 1), and Xiao-bing Li 1) 1) School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China 2) Key Laboratory for New Type of Function Material in Hebei Province, Hebei University of Technology, Tianjin 300130, China 3) National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China (Received: 26 October 2019; revised: 17 December 2019; accepted: 20 December 2019)
Abstract: A high content silicon aluminum alloy (Al–25Si–4Cu–1Mg) coating was prepared on a 2A12 aluminum alloy by supersonic plasma spraying. The morphology and microstructure of the coating were observed and analyzed. The hardness, elastic modulus, and bonding strength of the coating were measured. The wear resistance of the coating and 2A12 aluminum alloy was studied by friction and wear test. The results indicated that the coating was compact and the porosity was only 1.5%. The phase of the coating was mainly composed of α-Al and β-Si as well as some hard particles (Al9Si, Al3.21Si0.47, and CuAl2). The average microhardness of the coating was HV 242, which was greater than that of 2A12 aluminum alloy (HV 110). The wear resistance of the coating was superior to 2A12 aluminum alloy. The wear mechanism of the 2A12 aluminum alloy was primarily adhesive wear, while that of the coating was primarily abrasive wear. Therefore, it is possible to prepare a high content silicon aluminum alloy coating with good wear resistance on an aluminum alloy by supersonic plasma spraying. Keywords: coating; high silicon aluminum alloy; microstructure; mechanical properties; wear resistance
1. Introduction In recent years, high content silicon aluminum alloys have attracted to investigations into its performance (e.g., high specific strength, good thermal conductivity, and wear resistance) and potential applications [1–2]. Many countries have studied the production of engine cylinder liners with high content silicon aluminum alloys instead of cast iron, aiming to realize the manufacture of all-aluminum engine [3]. Currently, high content silicon aluminum alloys are mainly prepared using a spray forming technology [4–6]. The PEAK company of Germany has adopted a spray forming technology to produce a high content silicon aluminum alloy (Al–25Si–4Cu–1Mg) cylinder liner, which has been applied to Benz V6 and V8 engines. Nevertheless, a spray forming process has to be performed in a vacuum, it has many technological parameters, and it is a complicated operation. Additionally, there are too many defects produced by spray forming to meet the requirements of application. Therefore, hot extrusion treatment and heat treatment aging strengthening are needed to eliminate defects and improve mechanical
properties, which makes the spray formed high content silicon aluminum alloy costly and ineffi
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