• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 93-102.doi: 10.3901/JME.2018.10.093

• 材料科学与工程 • 上一篇    下一篇

冷喷连接铝铜异质接头的组织结构和力学性能

付斯林1, 李成新1, 魏瑛康1, 雒晓涛1, 杨冠军1, 李京龙2, 李长久1   

  1. 1. 西安交通大学金属材料强度国家重点实验室 西安 710049;
    2. 西北工业大学摩擦焊接陕西省重点实验室 西安 710072
  • 收稿日期:2017-06-19 修回日期:2017-12-14 出版日期:2018-05-20 发布日期:2018-05-20
  • 通讯作者: 李成新(通信作者),男,1974年出生,博士,教授,博士研究生导师。主要研究方向为功能涂层、热(冷)喷涂技术和异质材料连接。E-mail:licx@mail.xjtu.edu.cn
  • 作者简介:付斯林,男,1991年出生。主要研究方向为冷喷涂与异质金属连接。E-mail:fusilin112358@163.com

Microstructure and Mechanical Properties of Al-Cu Joints by Cold Spray Bonding

FU Silin1, LI Chengxin1, WEI Yingkang1, LUO Xiaotao1, YANG Guanjun1, LI Jinglong2, LI Changjiu1   

  1. 1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao Tong University, Xi'an 710049;
    2. Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072
  • Received:2017-06-19 Revised:2017-12-14 Online:2018-05-20 Published:2018-05-20

摘要: 针对铝铜间的物理性能差异以及熔化焊过程中易产生脆性相的特点,提出一种铜铝异质金属冷喷连接的新方法,该方法将纯铝粉末以固态形式高速撞击具有一定坡口的铜铝母材表面,通过粒子与母材、粒子与粒子间的累加成形将铝板和铜板在低于其熔点的情况下实现连接。为了提高接头的力学性能,采用不锈钢颗粒辅助强化方法,利用氮气为加速气体,气体预热温度为270℃,压力为2.4 MPa,Al/Cu冷喷连接接头的力学性能测试结果表明:拉伸断裂在铝母材,接头平均拉伸强度为63 MPa,结合区与铝结合界面平均剪切强度为42 MPa,结合区与铜结合界面平均剪切强度为38 MPa。接头与母材主要通过机械咬合方式连接,不锈钢颗粒的夯实效应使粒子塑性变形增加,提高了接头的致密度和强度,不锈钢颗粒在母材的嵌入钉扎作用可有效提高结合界面的剪切强度。

关键词: 冷焊, 冷喷连接, 冷喷涂, 异质金属接头

Abstract: The cold spray bonding method had been applied to connect the pure aluminum and copper in ambient environment under nitrogen gas at 2.4 MPa and 270℃, which can eliminate the brittle intermetallic compounds of welded joints under fusion welding process due to the physical mismatches in densities, melting points and elasticity modules. In this method, solid-state pure aluminum particles with high-speed impacted on the substrate. The stainless steel particles is added in the feedstocks that assisted to improve the mechanical properties of joints. The results of mechanical properties at the bonding joints show that the average tensile strength of bonded joints is about 63 MPa; the average shear strength of Cu-Al and Al-Al bonding interface is 38 MPa and 42 MPa, respectively. The joint is mainly connected to the base metals by mechanical interlocking; the plastic deformation of pure aluminum particles, the strength and density of bonded joints are significantly enhanced with the in-situ tamping effect from the stainless steel particles. The interlocking effect from the stainless steel particles embedded in the base materials can effectively improve the shear strength of the bonding joints.

Key words: cold spray, cold spray bonding, cold welding, dissimilar metal joint

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