超音速激光沉积WC/Cu复合涂层的微观结构及耐磨性能表征

doi:10.3901/JME.2020.10.078

机械工程学报 ›› 2020, Vol. 56 ›› Issue (10): 78-85.doi: 10.3901/JME.2020.10.078

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超音速激光沉积WC/Cu复合涂层的微观结构及耐磨性能表征

黄煊杰^1,2, 吴丽娟^1,2, 李波^1,2, 汪伟林^1,2, 张群莉^1,2, 弗拉基米尔·科瓦连科^1,3, 姚建华^1,2

1. 浙江工业大学激光先进制造研究院杭州 310014;
2. 浙江省高端激光制造装备协同创新中心杭州 310014;
3. 乌克兰国立科技大学激光技术研究所基辅 03056 乌克兰

收稿日期:2019-06-05 修回日期:2020-02-20 出版日期:2020-05-20 发布日期:2020-06-11
通讯作者: 姚建华(通信作者),男,1965年出生,博士,教授,博士研究生导师。主要研究方向为激光复合制造。E-mail:laser@zjut.edu.cn
作者简介:黄煊杰,男,1995年出生,硕士研究生。主要研究方向为激光复合表面改性技术。E-mail:xuanjiehuang@foxmail.com
基金资助:
国家自然科学基金（51701182）、国家重点研发计划（2017YFB1103601）、中国博士后基金面上（2019M662103）和浙江省基础公益研究计划（LGG19E050024）资助项目。

Microstructure Characterization and Tribological Properties Evaluation on WC/Cu Composite Coating Prepared by Supersonic Laser Deposition

HUANG Xuanjie^1,2, WU Lijuan^1,2, LI Bo^1,2, WANG Weilin^1,2, ZHANG Qunli^1,2, VOLODYMYR S. Kovalenko^1,3, YAO Jianhua^1,2

1. Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014;
2. Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014;
3. Laser Technology Research Institute, National Technical University of Ukraine, Kiev 03056 Ukraine

Received:2019-06-05 Revised:2020-02-20 Online:2020-05-20 Published:2020-06-11

摘要/Abstract

摘要： 针对纯铜具有良好的导电、导热和加工性能，但同时也具有硬度低，耐磨性能差的特点。采用超音速激光沉积（Supersonic laser deposition，SLD）和冷喷涂（Cold spray，CS）技术在纯铜表面制备了WC/Cu复合涂层，并对所制备涂层的微观结构、相组成、显微硬度和摩擦磨损性能进行了对比分析。研究结果表明，CS涂层的厚度约为1 128 μm，WC含量为7.73%，显微硬度为147.4 HV_0.2，但涂层/基体结合处存在明显间隙。SLD涂层厚度随着激光功率的逐渐升高而增加，最高涂层厚度达2 344 μm，WC含量可高达17.22%，显微硬度可达161.3 HV_0.2，且涂层/基体结合良好。SLD涂层能基本保留原始粉末的相组成，但高激光功率下制备的样品存在轻微氧化。SLD涂层相比于CS涂层和铜基体具有更小的摩擦因数、磨损宽度以及磨损量，表现出更好的耐磨性能，为铜及其合金的表面性能优化提供了一种新方法。

关键词: 超音速激光沉积, WC/Cu复合涂层, 固态沉积, 微观结构, 显微硬度, 耐磨损性能

Abstract: Pure copper has good conductivity of heat and electricity, but low hardness and poor wear resistance. Therefore, the WC/Cu composite coatings are prepared on the surface of copper substrate by supersonic laser deposition (SLD) and cold spray (CS). The microstructure, phase composition, microhardness and wear property of the as-prepared coatings are comparatively analyzed for these two technologies. The results show that the thickness of CS coating is about 1 128 μm, the WC content is 7.73% and the microhardness is 147.4 HV_0.2, but there are some gaps at the coating/substrate bonding zone. For SLD coating, the thickness increases with elevating laser power. The thickest coating thickness is up to 2 344 μm, the highest WC content is 17.22% and the highest microhardness reaches 161.3 HV_0.2. All SLD coatings show well-bonded coating/substrate interface. The SLD coating still retains the original phase composition of the feedstock powder. However, samples prepared at high laser power experienced slight oxidation. The wear resistance of the SLD coating is superior to that of the CS coating and Cu substrate, with lower coefficient of friction, wear scar width and wear loss. These results provide a new route for improving the surface properties of Cu and its alloys.

Key words: supersonic laser deposition, WC/Cu composite coatings, solid-state deposition, microstructure, microhardness, wear-resistance

中图分类号:

TG146

黄煊杰, 吴丽娟, 李波, 汪伟林, 张群莉, 弗拉基米尔·科瓦连科, 姚建华. 超音速激光沉积WC/Cu复合涂层的微观结构及耐磨性能表征[J]. 机械工程学报, 2020, 56(10): 78-85.

HUANG Xuanjie, WU Lijuan, LI Bo, WANG Weilin, ZHANG Qunli, VOLODYMYR S. Kovalenko, YAO Jianhua. Microstructure Characterization and Tribological Properties Evaluation on WC/Cu Composite Coating Prepared by Supersonic Laser Deposition[J]. Journal of Mechanical Engineering, 2020, 56(10): 78-85.

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超音速激光沉积WC/Cu复合涂层的微观结构及耐磨性能表征

Microstructure Characterization and Tribological Properties Evaluation on WC/Cu Composite Coating Prepared by Supersonic Laser Deposition

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