WC-Co reinforced NiCoCrAlYTa composite coating: Effect of the proportion on microstructure and tribological properties |
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| Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Materials Science and Engineering, Hebei University of Engineering, Handan 056000, China;1. Escola de Engenharia de Lorena, EEL-USP, 12600-970 Lorena, Brazil;2. Instituto de Física Rosario, CONICET-UNR, 2000 Rosario, Argentina;1. Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran;2. Department of Metallurgy, Amirkabir University of Technology, Tehran, Iran;1. Jiujiang Key Laboratory of Green Remanufacturing, 332005 Jiujiang, China;2. School of Mechanical & Materials Engineering, Jiujiang University, 332005 Jiujiang, China;1. Department of Materials Engineering, Isfahan University of Technology (IUT), Isfahan 84156-83111, Iran;2. Steel Research Center, Isfahan University of Technology (IUT), Isfahan 84156-83111, Iran;3. Department of Materials Engineering, Malek-Ashtar University of Technology, Shahin shahr, Isfahan 83145-115, Iran;1. Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330029, PR China;2. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, PR China;3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China |
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| Abstract: | The properties of the working surfaces are linked to the safety and lifespan of the modern machines so that variety of coatings are used to protect the parts from breakdown. The NiCoCrAlYTa coating, which has an excellent oxidation resistance, usually undergoes more serious friction and wear due to its lower micro-hardness in contrast to the ceramic coatings. Therefore, the composite coatings reinforced by WC-Co are prepared by HVOF sprayed technology and are also characterized by scanning electron microscope, Raman spectrometer and X-ray diffraction. At the same time, the friction and wear behaviors as well as the mechanisms of different friction pairs are also discussed, in detail. The composite coatings, which mainly consist of γ-(Ni, Co), β-NiAl, γ′-Ni3Al, WC and W2C, are dense and uniform. With the increase of WC-17Co, the microhardness of NiCoCrAlYTa/WC-Co composite coating has enhanced from 641.4 HV300g to 859.7 HV300g. The wear rates of the composite coatings (10?5–10?6 mm3·N?1 m?1) are far lower than those of the as-sprayed NiCoCrAlYTa coating (10?4 mm3·N?1 m?1). Overall, the mechanical properties and tribological behaviors of the coatings are greatly improved with the addition of WC-Co. |
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