Effect of processing parameters on the microstructure and properties of WC–10Co–4Cr coatings formed by a new multi-chamber gas-dynamic accelerator

Zircon-Based Ceramic Coatings Formed by a New Multi-Chamber Gas-Dynamic Accelerator

“…The possibility of the formation of high-velocity and low-thermal power jets has led to a substantial decrease in the consumption of the fuel gas, and allows for the formation of high-quality coatings on thin-walled parts made from low-melting point materials. Depending on the parameters for filling the detonation combustion chambers, it is possible to deposit ceramic coatings (alumina, titanium oxide, cermet coatings and others) [22][23][24][25][26][27][28]. As proven by the analysis results, the deposited coatings were hard (hardness of 800-1320 HV 0.3 ), dense (porosity below 1%), and had a thickness of up to 400 µm.…”

“…The grit blasted samples were cleaned in an ultrasonic bath and coatings were deposited immediately after cleaning. In this study, a multi-chamber, vertically mounted, gas-dynamic accelerator (MCDS) [21][22][23][24] was employed to deposit the coatings on corrosion-resistant steel substrates. The coatings were deposited with a frequency of 16 Hz.…”

“…Corrosion-resistant steel plates (Fe-0.12C-0.90Mn-0.025P-0.01S-16Cr-0.20Cu, all in wt %,) were employed as substrates. Steel substrates were sandblasted by alumina grits prior to spraying [21][22][23][24]. The grit blasted samples were cleaned in an ultrasonic bath and coatings were deposited immediately after cleaning.…”

“…In this study a new multi-chamber vertically mounted gas-dynamic accelerator (MCDS) was proposed to spray coatings [21][22][23][24]. The gas-dynamic devices used in the MCDS for dosing and synchronizing the injection of powder into the nozzle follows the line of the standard powder feeder used for HVOF systems (Metco).…”

“…The energy of shock waves in the combustion products becomes a source of increasing thermal vibrations of the atoms of the crystal lattice of a solid substrate material, which causes partial plasticization and weakening of energy bonds between atoms. Ultimately, the probability of bond breaking and penetration of the ceramic particle into the solid increases, forming a new layer between the substrate and the deposited material between the coating and the solid substrate [21][22][23][24].…”