ISSN   1004-0595

CN  62-1224/O4

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激光微织构排布方式对铝青铜摩擦学性能影响研究

Influence of Laser Micro-texture Arrangement on Tribological Properties of Aluminum Bronze

  • 摘要: 铝青铜(CuAl10Fe5Ni5) 因具有良好的硬度、耐磨性、耐蚀性和屈强比等性能常作为重要的结构材料广泛应用于工业领域中. 但随着科学技术的发展,传统的铝青铜已难以满足苛刻工况下的使用要求,使其在应用方面受到极大限制. 本文中利用激光加工技术在CuAl10Fe5Ni5表面分别制备了椭圆和三角形2种形状表面织构,探究了线性与交错2种不同排布方式对织构化CuAl10Fe5Ni5在干摩擦和油润滑下的摩擦学性能影响规律. 试验结果表明:油润滑下采用交错布置方式能提高材料表面承载能力、减小材料表面摩擦磨损;相对单一的椭圆、三角形织构排布以及采用椭圆和三角形织构交错布置能发挥不同形状织构间的协同作用,改善油润滑情况下材料耐磨性能. 在干摩擦下,采用线性布置方式可减小材料表面的摩擦阻力,而采用交错布置方式相对线性布置可提高材料表面耐磨损能力.

     

    Abstract: Aluminum bronze (CuAl10Fe5Ni5) alloy, because of its good hardness, wear resistance, corrosion resistance strength ratio, and other properties, is often used as an important structural material for the manufacturing of bearings, bushing, bearings, gears, sealing rings, propellers, valves and other key parts of mechanical equipment, and is widely used in marine engineering, machinery manufacturing and chemical industry. With the development of science and technology, the hardness, yield ratio and wear resistance of traditional aluminum bronze can no longer meet the requirements of use under harsh working conditions. The surface is prone to severe adhesive wear and abrasive wear and failure, which greatly reduces the reliability and service life of related basic parts and limits its application. Surface texture is a surface treatment technology that can effectively improve the tribological properties of friction pairs. In this study, a single ellipse, a triangle and a mixture of two shapes were processed on the surface of a CuAl10Fe5Ni5 substrate by laser processing, and the effects of linear and staggered arrangements on the tribological and wear properties of the textured CuAl10Fe5Ni5 surface under dry friction and oil lubrication were investigated. The anti-wear mechanism of the textured CuAl10Fe5Ni5 material under dry friction and oil lubrication was investigated. The test results showed that under oil lubrication, because the texture functions to store the lubricating medium, the textured surface could replenish the lubricating medium and fully lubricate the friction interface. Compared with the substrate surface, the textured surface had a remarkable lubrication and wear resistance effect. A staggered arrangement under oil lubrication could improve the bearing capacity of the material surface and reduce the friction and wear of the material surface. Compared with the single ellipse and triangle texture arrangements, the use of the ellipse triangle texture for the staggered arrangement had a synergistic effect on the different shape textures and improved the wear resistance. Under dry friction conditions, the textured CuAl10Fe5Ni5 had certain anti-friction and wear resistance effects compared with those of the substrate due to its chip tolerance. A linear arrangement could reduce the friction resistance of the material surface and thus reduce the friction coefficient of the textured surface, while a staggered arrangement could capture more debris reducing the wear of the contact area caused by small debris, and improve the wear resistance of the material surface. The staggered triangular texture had the best wear reduction effect, and the wear rate was reduced by 34.1%. The friction and wear performance of CuAl10Fe5Ni5 could be improved by the reasonable design and synergy of different shapes and different arrangements. The results could provide a theoretical reference for improving the design of surface lubrication and anti-wear properties of textured aluminum bronze materials.

     

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