Impacting Behavior of Large Oxidized Copper Particles in Cold Spraying
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JTTEE5 22:433–440 DOI: 10.1007/s11666-012-9849-8 1059-9630/$19.00 ASM International
Impacting Behavior of Large Oxidized Copper Particles in Cold Spraying Min Yu, Wenya Li, Xueping Guo, and Hanlin Liao
(Submitted June 25, 2012; in revised form October 12, 2012) In a previous study, it has been experimentally demonstrated that surface oxide films of metallic particles have significant influence on the properties of cold-sprayed coatings. To clearly reveal the underlying mechanism, this study focused further on the effect of particle oxidation on the deposition behavior of oxidized Cu powder. Results show that the presence of the oxide films on the particlesÕ surface can inhibit the plastic deformation of the particles. In addition, results concerning the morphologies and oxygen content of the rebounded particles show that the particles have experienced large plastic deformation that results in the break-up of the oxide films during the impacting process. Correspondingly, the hardness of the coating deposited with the oxidized powder is a little lower than that with the annealed powder because of the inferior plastic deformation and strain-hardening effect.
Keywords
cold spray, deformation behavior, microhardness, oxide films, oxidized Cu powder
1. Introduction In cold spraying (CS), solid powder particles are injected into a gas stream at the inlet of a converging/ diverging de-Laval-type nozzle to attain a high velocity before impacting upon a substrate, and coatings are formed under the intensive plastic deformation of particles at a temperature well below the melting point of spray materials (Ref 1-3). It has been widely accepted that, for a given material, there exists a critical velocity greater than This article is an invited paper selected from presentations at the 2012 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2012: Proceedings of the International Thermal Spray Conference, Air, Land, Water, and the Human Body: Thermal Spray Science and Applications, Houston, Texas, USA, May 21-24, 2012, Basil R. Marple, Arvind Agarwal, Laura Filofteia-Toma, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Andre´ McDonald, Ed., ASM International, Materials Park, OH, 2012. Min Yu, State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072, PR China; and LERMPS, Universite´ de Technologie de BelfortMontbe´liard Site de Se´venans 90010 Belfort Cedex, France; Wenya Li, State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072, PR China; Xueping Guo, Marine Engineering College, Jimei University, Xiamen, Fujian, China; and Hanlin Liao, LERMPS, ˜ de Technologie de Belfort-MontbO ˜ liard, Site de UniversitO ˜ venans, 90010 Belfort Cedex, France.Contact e-mails: liwy@ SO nwpu.edu.cn ,and [email protected].
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