Effects of Gas Property on Quality of NiCoCrAlY Coating by Cold Gas Dynamic Spraying

Abstract:

Known from the gas dynamic model of cold spraying, the properties of process gas including gas temperature, gas pressure and gas source have great influence on the critical velocity of powder. The influences of the three kinds of gas properties 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 show that, when the pressure value of process gas is 3.5MPa, the density of the coating is perfect, and there are obvious layered structures. The porosity is only 0.45%. The influence of gas temperature on the coating quality is the influence of that on the oxygen content. When the temperature of the process gas is confined to 600°C~700°C, the oxygen content is low and the coating comprehensive quality is best. On the premise that other parameters are kept constant, when nitrogen and helium gas are used together, the coating quality is better.

• Periodical: Advanced Materials Research (Volume 815)
• Pages: 682-686
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.815.682
• Online since: October 2013
• Authors: Sheng Qiang Feng, Bing Ma, Xiu Ling Wang, Guo Ping Ling
• Keywords: Coating Quality, Cold Spray, Critical Velocity, Gas Property, NiCoCrAlY Coating

References

[1] Zhou Xianglin, Zhang Jishan, Wu Xiangkun: Technology and application of advanced cold spray (China Machine Press, Beijing 2011).

[2] Alkhimov A P, Kosarev V F, Papyrin A N: Soviet Physics-Doklady Vol. 12(1990), pp.1047-1049.

[3] Alkhimov A P, Kosarev V F, Nesterovich N I, et al. Russian Patent (1990).

[4] Alkhimov A P, Kosarev V F, Papyrin A N: Dokl. Akad. Nauk SSSR Vol 315(1990), pp.1062-1065.

[5] Alkhimov A P, Kosarev V F, Papyrin A N. New materials and technologies. Theory and Practice of Materials Hardening in Extremal Processes. Nauka: Novosibirsk, 1992, 146-168.

[6] Alkhimov A P, Klinkov S V, Kosarev V F: Journal of Appl Mech and Tech Phy Vol. 41(2000), pp.245-250.

[7] Yuan Xiaoguang, Liu Yanxue, Wang Yisong, et al: Trans of the China Welding Institution Vol. 28(2007), pp.9-11.

[8] Liu Yanxue, Yuan Xiaoguang, Huang Hongjun, et al: Spec Casting & Nonferrous Alloys Vol. 26(2006), pp.204-207.