空间结构增强铜基复合材料的摩擦磨损特征

为实现铜基复合材料性能的有效调控，采用激光选区熔化成形制备了单元尺寸分别为5.00、3.75、2.75、1.75和0.75 mm的18Ni300空间结构增强体，然后在挤压铸造条件获得了具有不同增强体分布的18Ni300空间结构增强铜基复合材料. 研究了复合材料的微观组织、硬度、摩擦磨损性能和磨损表面形貌. 结果表明：随着空间结构单元尺寸的减小，复合材料增强体体积分数不断增加，硬度和耐磨性提高. 结构单元尺寸为0.75 mm时，复合材料增强体体积分数为13.35%，硬度达到HBW120，为铜基体硬度的1.71倍；载荷40 N、线速度0.75 m/s、磨损时间25 min 条件下的体积磨损量为35.4 mm3，比铜基体磨损量降低58%. 由于增强体的作用，复合材料的磨损机制由纯铜的黏着磨损转变为磨粒磨损.To effectively regulate the properties of copper matrix composites, 18Ni300 spatial structural reinforcements with unit sizes of 5.00, 3.75, 2.75, 1.75 and 0.75 mm were fabricated via selective laser melting (SLM). Then, 18Ni300 spatial structure-reinforced copper matrix composites with different reinforcement distributions were obtained via squeeze casting. The microstructure, hardness, friction and wear properties and wear surface morphology of the composites were investigated. The results show that as the unit size of the spatial structures decreases, the volume fraction of reinforcements in the composites continuously increases, and both hardness and wear resistance are improved. When the unit size of the structures is 0.75 mm, the volume fraction of reinforcements in the composite reaches 13.35%, and the hardness reaches 120 HBW, which is 1.71 times that of the copper matrix. Under the conditions of a load of 40 N, linear velocity of 0.75 m/s and wear time of 25 minutes, the volume wear loss is 35.4 mm³, which is 58% lower than that of the copper matrix. Owing to the effect of the reinforcements, the wear mechanism of the composite changes from the adhesive wear of pure copper to abrasive wear.

搜集汇总

背景与挑战

背景概述

该数据集研究了空间结构增强铜基复合材料的摩擦磨损特性，通过制备不同单元尺寸（5.00 mm至0.75 mm）的18Ni300增强体，分析其微观组织、硬度和磨损性能。结果显示，随着单元尺寸减小，增强体体积分数增加，硬度和耐磨性显著提升，例如0.75 mm单元尺寸时硬度达HBW120、磨损量比纯铜降低58%，且磨损机制从黏着磨损转变为磨粒磨损。