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ArticleName Understanding the process of installing Al + Al2O3 powder coatings by cold gas dynamic spraying on substrates with different surface roughness
DOI 10.17580/tsm.2021.07.06
ArticleAuthor Kuang Nguyen, Aleshchenko A. S., Guseynov E. R.

National University of Science and Technology MISiS, Moscow, Russia:

Nguyen Kuang, Postgraduate Student at the Department of Metal Forming, e-mail:
A. S. Aleshchenko, Head of the Department of Metal Forming, Associate Professor, Candidate of Technical Sciences, e-mail:
E. R. Guseynov, Master’s Student at the Department of Metal Forming, e-mail:


The present research paper aims to study the process of gas-dynamic cold spray at low pressure. The influence of surface roughness of substrate aluminum alloy A7 on the sprayed coatings porosity is also researched. The developed powder mixture A-10-1 (Al + 79.3% Al2O3) was used as the sprayed material. The samples surface was subjected to abrasive treatment, after that the surface roughness was evaluated using a profilometer with an estimate of the microroughness Ra ranging from 0.4 μm to 1.5 μm. The coating process was sprayed by the low-pressure cold spraying method using the DIMET 405. The working gas is compressed air, which is heated to 450 оC and accelerated by pressure. The heated flow of gas and powders impact to substrate and make a deposition. As a result of studying of the obtained coating’s microstructure by the metallographic method using SEM was found that the porosity in the sprayed coating is not low, reaches values from 0.56 to 0.89%, and rises along with increasing of surface roughness of the substrate during the coating process of A-10-1 powder mixture. The size of the pores ranging from 1 μm to 15 μm. Moreover, the orientation of the substrate roughness does not affect the quality of the coatings. The efficiency of cold spraying by the low-pressure method is measured. Due to the low contact speed and temperature during spraying, the deposition efficiency is low, in criminating to 5%.

keywords Powder, cold gas-dynamic spraying, gas-dynamic coating, porosity, surface roughness, spraying efficiency

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