Abstract
The article presents the study results of detonation spraying parameters on the phase composition and tribological properties of NiCr-Al2O3 powder coatings. The spraying was carried out at a ratio of the acetylene-oxygen mixture O2 /C2H2=1.856. The detonation barrel filling volume with an explosive gas mixture varied from 30% to 68%. It is determined that the phase composition of the NiCr-Al2O3 coatings varies depending on the degree of detonation barrel filling. With an increase in the detonation barrel’s filling volume, the intensity of the NiCr diffraction peaks is decreased, and the intensity of the a-Al2O3 reflexes is increased, which indicates an increase in the content of the Al2O3 phase. When low filling volume, there is determined a low coating density and uneven roughness. The tribological test results showed that with an increase in the detonation barrel filling volume, there is a decrease in the wear volume, which confirms the increase in the coatings wear resistance. Determined that the lowest friction coefficient was recorded in the sample obtained at the barrel filling volume 68%. The coatings’ high wear resistance is associated with an increase in the alpha phase volume fraction of a-Al2O3 and coatings density.
Highlights
At present, an actual task is to increase the reliability and durability of products, the performance characteristics of which are determined by the properties of their working surfaces
The tribological test results showed that with an increase in the detonation barrel filling volume, there is a decrease in the wear volume, which confirms the increase in the coatings wear resistance
A popular application of the detonation spraying method is the spraying of powders of various systems: Ni-Cr; Cr 3 C 2 NiCr; NiCr-Al; WC-Co; NiC-Al 2 O 3 ; etc. to obtain functional coatings working under extreme conditions [6, 7]
Summary
An actual task is to increase the reliability and durability of products, the performance characteristics of which are determined by the properties of their working surfaces. One of the most promising ways to improve the performance properties and increase the durability of products is to apply functional coatings on their surfaces using various spraying technologies [1,2,3,4]. One of the promising methods of coating, intended to work in the hardest conditions under the action of extreme loads and temperatures, is detonation spraying [5]. This method allows obtaining a coating with less heating of sprayed part, which avoids the deformation during the spraying process, as well as to exclude adverse phenomena that accompany the process when heating part, such as surface satiation of the part with gases. A popular application of the detonation spraying method is the spraying of powders of various systems: Ni-Cr; Cr 3 C 2 NiCr; NiCr-Al; WC-Co; NiC-Al 2 O 3 ; etc. to obtain functional coatings working under extreme conditions (high temperature and pressure, intense friction wear, alternating loads, etc.) [6, 7]
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