摘要铜合金具有很高的导电、导热性能,良好的塑性和耐腐蚀性,在很多领域都有 着广泛的应用。但是因为它的耐磨性较差,常常造成铜合金零件出现磨损。本文介 绍了铜合金表面改性的主要方法,选用激光熔覆技术对铜合金进行表面改性处理。 本次试验选用KF-Ni60A粉末在CuCrZr合金表面进行激光熔覆,通过对熔覆后的涂层 的微观组织、显微硬度、XRD和摩擦系数等进行分析后得出了:80624
在单道次激光熔覆工艺试验中,通过控制变量得出了在扫描速度为 2mm/s、送 粉速率为 4g/min 和激光功率为 3400w 下进行激光熔覆时,所获得的熔覆层具有较好 的性能。
XRD 分析表明熔覆层为 FeNi3、CrB 等多种合金相共存的结构。由于有细晶强 化、固溶强化等强化作用,熔覆层的硬度相较于铜基体有了明显的升高。
摩擦磨损试验表明,熔覆层对摩擦副的摩擦系数略低于 Cu 合金基体的摩擦系 数,且更加稳定。很好的传递了摩擦副与铜合金之间的载荷,降低了铜合金塑性变 形的倾向,因此增强了铜合金零件的耐磨损性能。
毕业论文关键词:铜合金;激光熔覆;自熔性粉末;
Abstract Copper alloy with high electrical conductivity, thermal conductivity, good ductility and corrosion resistance in many fields have a wide range of applications。 But because of its poor wear resistance, often resulting in a copper alloy parts wear。 This article describes the main methods of copper alloy surface modification, the choice of laser cladding copper alloy surface modification。 The test chosen KF-Ni60A powder CuCrZr laser cladding alloy surface by coating after after cladding microstructure, hardness, XRD and friction coefficient drawn from the analysis of:
In a single pass laser cladding experiment, the control variables obtained by the scanning speed of 2mm/s, feed rate of 4g/min and a laser power of the next 3400w laser cladding, obtained cladding layer having a good performance。
XRD analysis showed that the cladding layer as FeNi3, CrB and other structures multiple alloy phase coexist。 Due to fine grain strengthening, solid solution strengthening, the hardness of the cladding layer compared to copper-based body has been significantly increased in。
Friction and wear tests show that the cladding layer of the friction coefficient of friction is substantially lower than the friction coefficient of Cu alloy matrix, and more stable。 A good load transfer and friction between the copper alloy, copper alloy reduces the tendency of plastic deformation, thus significantly improving the wear resistance of copper alloy substrate。
Key words:Copper alloy;Laser Cladding;Self-fluxing powder;
目 录
第一章 绪论 1
1。1 铜合金的性质与分类 1
1。2 改善铜合金表面性能的方法 2
1。2。1 电镀法 3
1。2。2 热喷涂 3
1。2。3 激光熔覆 4
1。3 激光熔覆技术 5
1。4 激光熔覆的优势和特点 5
1。6 主要研究内容 8
第二章 试验材料、设备及方法 9
2。1 试验材料 9
2。1。1 基体材料 9
2。1。2 熔覆粉末 9
2。2 激光熔覆设备及工艺