Deposition behavior of multi-particle impact in cold spraying process |
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| Authors: | Xiang-lin Zhou Xiang-kun Wu Hui-hua Guo Jian-guo Wang Ji-shan Zhang |
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| Affiliation: | (1) School of Energy and Power Engineering, Dalian University of Technology, 2, Linggong Road, Dalian, Liaoning, 116024, P.R. China;(2) Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an, 710072, P.R. China;(3) Faculty of Engineering, Kingston University, Friars Avenue, London, SW15 3DW, UK |
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| Abstract: | In the practical cold-spraying process, a number of particles impact onto a substrate and then form a coating. To study the
deformation behavior and multi-particle interactions, single-particle, two-particle, and three-particle impacts were simulated
using the AN-SYS/LS-DYNA version 970. A copper coating was prepared and scanning electron microscopy (SEM) was employed to
analyze the microstructures of the powders and the coating. Numerical results reveal that the critical deposition velocity
is 600 m/s for a copper particle/copper substrate. The particles deform more fully due to multi-particle interactions, such
as tamping, interlocking, and extrusion effects. The compression ratio increases from 40% to 70% as a result of the tamping
effect. This is beneficial for achieving the cold-sprayed coating. The multi-particle morphology and compression ratio in
the experiment are consistent with those of simulation results. Based on these results, the coating of high performance can
be prepared through selecting appropriate parameters and suitable pre-treatment processes. |
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