Abstract
Comparative tests of gas detonation (GDS) coatings were carried out in order to investigate the influence of spraying parameters on abrasive wear under dry friction conditions. The tests were carried out using the pin-on-disc (PoD) method at room temperature. The microstructure of the coatings was analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM / EDS) methods. The results showed that with specific GDS process parameters, the main phases in both coatings were FeAl and Fe3Al involving thin oxide films Al2O3. The tribological tests proved that the coatings sprayed with the shorter barrel of the GDS gun showed higher wear resistance. The coefficient of friction was slightly lower in the case of coatings sprayed with the longer barrel of the GDS gun. During dry friction, oxide layers form on the surface, which act as a solid lubricant. The load applied to the samples during the tests causes shear stresses, thus increasing the wear of the coatings. During friction, the surface of the coatings is subjected to alternating tensile and compressive stresses, which lead to delamination and is the main wear mechanism of the coatings.
Highlights
Despite the low production costs, the industrial application of solid FeAl alloys is limited due to low ductility and resistance to cracking at room temperature
This creates potential opportunities for their use as heat-resistant construction materials (Panas et al 2019). The reason for this is that the FeAl powder particles are subjected to strong oxidation in a hot stream of gaseous products of supersonic combustion detonation. This results in the formation of a multiphase coating structure with the participation of oxide phases formed at the grain boundaries in the form of thin films, due to the strong plastic deformation of the powder particles forming the coating
Tribological tests carried out on coatings produced with the gas detonation method (GDS) under dry friction conditions made it possible to compare the wear of the coatings with the use of various spraying parameters
Summary
Despite the low production costs, the industrial application of solid FeAl alloys is limited due to low ductility and resistance to cracking at room temperature. The Fe-Al phase-matrix intermetals produced by the GDS method are a material with unique properties They are resistant to high-temperature corrosion (heat resistance) in aggressive sulphide and chloride environments (Senderowski 2015). This creates potential opportunities for their use as heat-resistant construction materials (Panas et al 2019) The reason for this is that the FeAl powder particles are subjected to strong oxidation in a hot stream of gaseous products of supersonic combustion detonation. This results in the formation of a multiphase coating structure with the participation of oxide phases formed at the grain boundaries in the form of thin films, due to the strong plastic deformation of the powder particles forming the coating. The grains of primary particles change their morphology from equiaxial to streaked during strong plastic deformation (Chrostek 2020, Fikus et al 2019, Senderowski et al 2011)
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