Deposition Behavior and Characteristics of Cold-Sprayed Cu-Cr Composite Deposits
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JTTEE5 21:792–799 DOI: 10.1007/s11666-012-9755-0 1059-9630/$19.00 ASM International
Deposition Behavior and Characteristics of Cold-Sprayed Cu-Cr Composite Deposits Xiang-kun Wu, Xiang-lin Zhou, Hua Cui, Xiong Zheng, and Ji-shan Zhang (Submitted August 3, 2011; in revised form December 31, 2011) In order to explore the feasibility of cold spraying as method to prepare Cu-Cr composite, the deposition behavior was analyzed. The results show that particles parameters, such as morphology, size distribution and deformability, result in different deposition behavior. For Cu, since plastic deformation easily occurs, when a Cu particle impacts Cu substrate, both particle and substrate at the interface undergo extensive deformation, resulting in the greater bond probability. Although the velocity of Cr is higher than that of Cu, Cr particles have lower bond probability because of its hardness and fragility. Cr particles are embedded in the Cu particles. The properties of Cu-15%Cr meet industrial standard, superior to the composite prepared by explosive compaction. The results reveal cold spraying can be considered as a suitable technology for Cu-Cr composite.
Keywords
cold spray, composite deposits, Cu-Cr, deposition
1. Introduction Cr particle-reinforced Cu matrix composite is also called Cu-Cr alloy, and it is a kind of pseudo-alloy where Cr particle embeds in Cu matrix. Different compositions of Cu-Cr have been widely used as electrical contact materials, especially in medium-voltage, high-current vacuum breakers because of its excellent electrical conductivity, high breaking current capability, and high capability of resistance electric arc corrosion and resistance surface fusion welding (Ref 1). Cu and chromium are immiscible, so they fully retain their good performance. Indeed, Cu has a relatively low melting point, high electrical conductivity and thermal conductivity and good plasticity, which will be helpful to improve the breaking current capability and ensure the large operating current in circuit breaker, while Cr with a relatively high melting point and the brittle nature provides a high voltage withstand property and anticorrosion property of arcing. Also, the strong affinity of Cr and oxygen ensures a high degree of vacuum in the interrupter (Ref 2). High quality Cu-Cr alloy requires that Cr phase must uniformly distribute in Cu matrix, and the alloy should be dense. At present, there are several different methods to manufacture Cu-Cr bulk alloy, such as mixed powder sintering (Ref 3, 4), melt infiltration, arc melting, Xiang-kun Wu, Xiang-lin Zhou, Xiong Zheng, and Ji-shan Zhang, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; and Hua Cui, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China. Contact e-mail: wuxiangkun451@ yahoo.com.cn.
792—Volume 21(5) September 2012
rapid solidification (Ref 5, 6), thermal spraying (Ref 7) and explosive compaction (Ref 3). However
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