Influence of Spraying Parameters on the Structure and Tribological Properties of Cr3C2-NiCr Detonation Coatings

Abstract

In this work, the influence of spray parameters on the formation of the microstructure, phase composition, and the tribological properties of detonation flame sprayed coatings was studied. It was determined that the chemical composition of Cr3C2-NiCr coatings during detonation spraying depends on the degree of filling the barrel with an explosive gas mixture. The degree of filling the barrel with an explosive gas mixture at 73% leads to a decrease in the content of carbide phases, and at 57% filling of the barrel, an increase in carbide phases is observed. It is established that the decrease of the filling degree leads to the increase of hardness and wear resistance of the Cr3C2-NiCr coatings since the hardness and wear resistance of the coating material deposited at 57% is higher than at 65% and 73%; this is due to the increase in the carbide phase Cr3C2. Detonation flame sprayed Cr3C2-NiCr gradient coatings have been developed in this study, which is carried out by varying the spray parameters. It was found that in the gradient coating, Cr3C2-NiCr carbide phases gradually increase from the depth to the surface. The obtained gradient coating closer to the substrate consists of the CrNi3 phase, while the coating surface consists of CrNi3 and Cr3C2 phases.

Investigation of the Influence of Powder Fraction on Tribological and Corrosion Characteristics of 86WC-10Co-4Cr Coating Obtained by HVOF Method

“…Therefore, WC-Co-Cr coatings can be applied to pipeline valve parts using the HVOF process as a replacement for conventional hard chrome plating to extend the service life of gate valves [1,19]. WC-Co-Cr coatings can also be deposited using various spraying methods such as air plasma spraying (APS), vacuum plasma spraying (VPS), detonation spraying, arc spraying and flame spraying [20][21][22][23][24][25][26]. Among the above methods, the HVOF process is considered to be the most promising method, successfully providing solutions to many issues related to oxidation, wear resistance, hot corrosion and erosion [27].…”

Influence of Pulse-Plasma Treatment Distance on Structure and Properties of Cr3C2-NiCr-Based Detonation Coatings

“…One of the ways to improve the performance characteristics and increase the service life of such products is the application of various technologies for applying functional coatings to the surfaces [1][2][3]. Taking into account the relatively high resistance to wear and corrosion of Cr 3 C 2 -NiCr metal-ceramic composition, these coatings have been widely used for the application of wear-and corrosion-resistant coatings on steel elements in the hot parts of waste-combustion boilers, as well as in electric furnaces and equipment operating on natural gas [4,5]. Metal-ceramic coatings of Cr 3 C 2 -NiCr system obtained by gas-thermal spraying methods are also used to reduce wear and protect against corrosion at high temperatures in parts of gas turbines operating under dry-friction conditions and used in various industries: electric power, oil refining, and the aerospace industry [5][6][7].…”