Cu663合金表面石墨-铜三维复合润滑层的构筑与摩擦学性能研究

借助激光微加工技术，将柔性石墨纸加工成规则排列的多孔结构，利用多孔柔性石墨纸在Cu663合金表面构筑石墨-铜三维复合润滑层结构. 分别考察了表面石墨-铜三维复合润滑层在干摩擦和海水腐蚀环境下的摩擦学性能，并揭示了摩擦磨损机理和腐蚀机理. 结果表明:该三维复合润滑层结构具有优异的自润滑性能，且通过改变纹理图案和尺寸参数可有效调控其摩擦学性能. 当Cu663合金表面三维复合润滑层石墨表面密度为50%时，干摩擦条件下的摩擦系数和磨损率分别为0.14 ± 0.01和(5.10 ± 1.33) ×10?6 mm3/(Nm)，相较于无润滑层的Cu663样品摩擦系数0.53和磨损率(2.97 ± 0.57) ×10?4 mm3/(Nm)分别降低73%和2个数量级. 在海水腐蚀环境中，表面石墨-铜三维复合润滑层的铜与石墨纸界面产生微弱电极，对三维复合润滑层的腐蚀摩擦性能起到至关重要的作用. 

Construction of Graphite-Copper 3-D Composite Lubricating Layer on Cu663 Alloy Surface and its Tribological Performances

A surface composite-lubrication structure was constructed on the surface of Cu663 alloy using flexible graphite paper textured by laser micromachining technology. Tribological properties, wear and corrosion mechanisms were investigated under dry and seawater conditions. Results indicated that the composite-lubrication structure exhibited excellent self-lubricating properties, and the structural parameters (texture types and geometrical parameters) significantly influenced the friction coefficient and wear rate of the composition-lubrication structure. The composite-lubrication structure showed the optimal tribological properties when the graphite content reached 50%. The friction coefficient and wear rate decreased to 0.14 ±0.01 and (5.10 ±1.33) ×10?6 mm3/(Nm) respectively, which were nearly 73% and two orders of magnitude lower than those of copper alloy. Under seawater environment, the formation of microelectrodes on Cu663 alloy and textured graphite interface played a critical role in improving the friction performance of the composition-lubrication structure in corrosion conditions.