Abstract No.:
2505

 Title:
Influence of gas temperature, particle size and substrate nature on the deposition behavior of cold sprayed magnesium coatings

 Authors:
Xinkun Suo* / Chinese Academy of Sciences, P.R. China
Xueping Guo/ LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France
Wenya Li/ Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, China
Marie-Pierre Planche/ LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France
Rodolphe Bolot/ LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France
Hanlin Liao/ LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France
Christian Coddet/ LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France

 Abstract:
In this study, magnesium coatings were deposited upon aluminum and stainless steel substrates by cold spraying. Three Mg powders with different particle size distributions were used as feedstocks. The microstructures of the as-sprayed coatings were evaluated by using optical microscopy, scanning electron microscopy. Coatings were also characterized using X-ray diffraction and microhardness tester for the phase compositions and hardness. The coating observations show that the gas temperature has an important effect on the deposition behavior of particles. Changing the gas temperature from 350oC to 630oC, the deposition efficiency of particles has an increase from 1.57% to 19.57%. The microhardness of the coatings was about 38HV under the gas temperature above 450oC, which is close to that of pure Mg bulk. The effects of particle size distribution and substrate material on the deposition efficiency of particles were also investigated. The results show that the particle size distribution has a significant effect on the deposition efficiency of particles which increases from 20% to 59% when the mean particle size decreases from 63µm to 38µm under the gas temperature of 630oC. However, the deposition efficiency of particles is little influenced by the substrate material. In addition to these experimental results, the in-flight particle velocities were simulated by FLUENT software to point out the effects of the gas temperature and particle size distribution. The modeled results show that the in-flight particle velocities increase with the increase of the gas temperature confirming the experimental results.

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