Effects of Standoff Distance and Particle Size on Quality of NiCoCrAlY Coating by Cold Spraying

Abstract:

According to the gas dynamic property of cold spraying, the distance from the outside of nozzle to the substrate has great influence on the coating quality including the thickness of coating and the deposition effeciency. Meanwhile, the effects of particle size on coating quality are of the utmost importance. The influences of two parameters above on the quality of the NiCoCrAlY coating on the magnesium substrate by the experiments of the cold gas dynamic spraying were discussed in this study. The results of the experiments showed that, based on the fact that other parameters were not changed, when the standoff distance was more than 50mm, there were no complete coatings on the surface of the substrate, and its thickness was asymmetrical. When the standoff distance was 25mm, the thickness was homogeneous, and the oxygen content was only 1.3%. Also, when the particle size was 5~50μm, the coating quality was better.

• Periodical: Applied Mechanics and Materials (Volumes 513-517)
• Pages: 265-268
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.513-517.265
• Online since: February 2014
• Authors: Sheng Qiang Feng*, Bing Ma, Xiu Ling Wang, Guang Liu, Zi Yun Zheng, Li Ping Pan
• Keywords: Coating Quality, Cold Spray, NiCoCrAlY Coating, Particle Size, Standoff Distance

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