Abstract
We report the results of the influence of the acetylene and oxygen gas pressure on the wear resistance of aluminum–bronze coatings deposited on naval brass substrate by means of the thermal (flame) deposition process. The coatings were characterized by means of scanning electronic microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), and X-ray fluorescence (XRF). The adhesion was determined with cross-hatching tests, and the mechanical response was assessed by measuring the nanohardness and by three-body and ball-on-disk abrasive wear tests. The results indicate that changes in the pressure and flow of the gas affect the morphology and the mechanical properties of the coatings, and these effects have consequences for the wear behavior of the coatings. Before the projection of the coatings, numerical simulations were carried out using Jets & Poudres software, where the collision speed of the particles was identified as the most significant factor that influences the mechanical properties and the performance of the coating. The gas pressure modified the hardness and the porosity level, which allowed improving the wear resistance.
Highlights
In industry, there is a need to improve the processes of protection and repair of naval, automotive, and aeronautical components
The morphology will depend on the solidification stages of the individual splats, as well as the accumulation of these splats on the substrate, the speed of the particles, and their temperature [19]
Aluminum–bronze coatings on naval brass were produced by means of the thermal projection by flame technique, varying the pressure of the feed gases in order to study their mechanical and tribological properties
Summary
There is a need to improve the processes of protection and repair of naval, automotive, and aeronautical components. In order to reduce the wear rate of these components, the application of protective coatings using thermal spraying is a strategy that has undergone rapid development in recent years These techniques seek to extend the useful life of the components in the face of the difficulties of fabrication and the rise in price of the components in the replacement process. An economical and efficient alternative for protecting these components is the use of flame spraying For this purpose, an aluminum–bronze alloy can be used, which is a good alternative for replacing parts subjected to wear environments [1] and which has a chemical composition very similar to that of the components that are used in the transportation industry. The mechanical properties of aluminum–bronze coatings depend on the aluminum
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