Surface Preparation by Detonation Unit before Coating Spraying

Abstract

The article proposes a method for sandblasting the surface before coating spraying with a detonation unit using a standard loading depth of 400 mm for the abrasive powder material. Calculations of the treated particles as an abrasive material made of aluminum oxide have been performed and the granulation of the powder has been substantiated. The surface roughness of the samples obtained using abrasive powders with different grain sizes were measured. The microstructure of the treated surface of the samples was studied during substrate processing using the loading depth of the powdered abrasive material by 200, and 400 mm. Studies using various materials made of steel (St20) and aluminum alloy (D16) as substrates are presented, and surface roughness is measured. The velocity, temperature and energy of the particles required to obtain the required surface roughness of the substrate are calculated. A surface treatment technology has been developed for parts in order to reduce the time between surface preparation operations and the coating spraying process itself, which can be used for thin-walled parts in order to preserve their geometry after sandblasting. In the developed method of surface preparation before detonation coating spraying, the necessary surface roughness was obtained for applying detonation coatings. An example of the application of the technology of surface preparation by a detonation installation on parts made of D16 is given, which shows a significant reduction in the time of sandblasting the surface before spraying the detonation coating

The work was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation (project no. 125012200581-1)

Please cite this article in English as:

Vashin S.A., Ruban E.A. Surface preparation by detonation unit before coating spraying. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2026, no. 2 (157), pp. 69--84 (in Russ.). EDN: NNXWTV

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