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1、纳米碳化钨增强镍基合金热喷涂涂层的摩擦磨损性能研究Abstract:In this study, Ni-based alloy coatings were prepared by thermal spray technique, and their tribological properties were investigated under different conditions. The coatings were reinforced with tungsten carbide nanoparticles and tested under dry sliding conditions.
2、 The results showed that the incorporation of tungsten carbide nanoparticles significantly improved the wear resistance and friction properties of the coatings. The coating with the highest content of tungsten carbide exhibited the best tribological performance. The worn surfaces of the coatings wer
3、e examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to determine the wear mechanisms.Keywords: Ni-based alloy, tungsten carbide, thermal spray, tribology, wear mechanism.Introduction:Ni-based alloys have been widely used in a variety of industrial and engineering application
4、s due to their excellent mechanical and chemical properties. However, in harsh environments, such as high temperature and corrosive conditions, the performance of these materials can be compromised. The addition of reinforcing materials can enhance their properties and performance.Tungsten carbide n
5、anoparticles have attracted considerable attention as reinforcing agents due to their high hardness, wear resistance, and thermal stability. In this study, we investigated the tribological properties of Ni-based coatings reinforced with tungsten carbide nanoparticles using thermal spray technique.Ex
6、perimental Procedures:Ni-based coatings with different tungsten carbide content were prepared using a thermal spray technique. The coatings were deposited on the surface of steel substrates using a HVOF (high-velocity oxy-fuel) thermal spray system. The tungsten carbide nanoparticles were added to t
7、he Ni-based alloy powder using a ball milling process.The coatings were tested under dry sliding conditions using a pin-on-disk tribometer. The sliding speed was 1 m/s, and the load was varied from 5 to 50 N. The wear rate and coefficient of friction (COF) were measured under different test conditio
8、ns. The worn surfaces of the coatings were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to determine the wear mechanisms.Results and Discussion:The results showed that the incorporation of tungsten carbide nanoparticles significantly improved the wear resistance and fri
9、ction properties of the Ni-based coatings. The coating with the highest content of tungsten carbide exhibited the best tribological performance.Under low load conditions, the wear rate and COF of the coatings increased with increasing tungsten carbide content. However, under high load conditions, th
10、e wear rate and COF decreased with increasing tungsten carbide content. This can be attributed to the formation of a protective layer of tungsten carbide on the worn surface, which reduces the contact between the coating and the counterface.The SEM images of the worn surfaces showed that the coating
11、s reinforced with tungsten carbide had a smoother surface than the coatings without tungsten carbide. This indicates that the tungsten carbide nanoparticles can reduce the surface roughness and prevent the formation of wear debris. The XRD analysis showed that the coatings had a nanocrystalline stru
12、cture, which can improve their mechanical and tribological properties.Conclusion:In conclusion, the addition of tungsten carbide nanoparticles improved the tribological properties of Ni-based alloy coatings prepared by thermal spray technique. The coatings exhibited improved wear resistance and fric
13、tion properties under different test conditions. The highest content of tungsten carbide exhibited the best tribological performance. The wear mechanisms were attributed to the formation of a protective layer of tungsten carbide on the worn surface and the reduction of surface roughness.Furthermore,
14、 the use of tungsten carbide nanoparticles in Ni-based coatings offers a promising approach for addressing the challenges of wear and tear in various applications, such as aerospace, automotive, and tooling industries. The coatings can provide an economical and effective solution to prolong the life
15、span and improve the performance of components exposed to harsh operating conditions.Moreover, the thermal spray technique used to prepare the coatings is a high-precision, versatile process that can be easily controlled to optimize the coating microstructure and properties. The process can also be
16、scaled up for large-scale production, making it a valuable technique for industrial applications.However, further studies are needed to investigate the long-term durability and stability of the coatings under different environmental conditions, including high temperature and corrosive environments. The interaction between the tungsten carbide nanoparticles and the coating matrix also needs to be examined to better understand the r
