The role of microstructure in the mechanism of high velocity erosion of Cr3C2–NiCr thermal spray coatings: Part 1 — As-sprayed coatings

Corrosion and erosion–corrosion behaviour of activated combustion high-velocity air fuel sprayed Fe-based amorphous coatings in chloride-containing solutions

“…The AC-HVAF AMC exhibits a higher erosion resistance than the HVOF one during the erosion-corrosion process. This finding is similar to the results of WC and Ni/Cr thermal spraying coatings, such as the enhanced erosion resistance [17,20], wear resistance [18,21] and fatigue resistance [19] of AC-HVAF coatings compared with HVOF ones. The HVOF spray promotes carbide dissolution and resulted in reduced inter-splat adhesion on a scale comparable to the erosion impact damage [20].…”

“…In the process, spray particles are heated below their melting temperature while being accelerated to a velocity of typically 700-850 m s −1 , forming a coating upon impact on a substrate. The oxidation and thermal deterioration of sprayed materials are significantly reduced, resulting in highimpact coatings with extremely low oxide content, which may yield coatings with lower porosity and higher bonding strength to the substrates [15][16][17][18][19][20][21][22]. Considering these advantages, AC-HVAF spraying is considered the preeminent process for the deposition of Fe-based AMCs exhibiting superior wear and corrosion resistances compared with HVOF.…”

Mikrostruktura i odporność na zużycie powłok natryskiwanych metodą płomieniowo-proszkową mieszaninami proszków

“…Obiecującymi materiałami do zastosowania na elementy ulegające zużyciu erozyjno-ściernemu są natryskiwane powłoki kompozytowe niCr-WC [4,5] oraz niCr-Cr 3 C 2 [6]. mechanizm zużywania powłok natryskiwanych jest trudny do opisu ze względu na ich budowę, obecność pęknięć w ziarnach, naprężeń własnych i niejednorodności w składzie chemicznym i fazowym ziaren.…”

Characterisation of HVOF sprayed Cr3C2-50(Ni20Cr) coating and the influence of binder properties on solid particle erosion behaviour

“…They are now increasingly being deposited by high velocity spray processes like high velocity oxy-fuel (HVOF), detonation gun spray and high velocity air-fuel (HVAF) processes to minimize decarburisation of carbides during the spray process and to produce dense coatings [3,[5][6][7][8] resulting in an improved wear performance. Thermal spraying of Cr 3 C 2 -NiCr powder causes dissolution of some carbide particles in-flight increasing the Cr and C content in the molten NiCr binder [7,[9][10][11][12][13][14][15][16][17]. Upon impact with a relatively cooler substrate these small particles are rapidly cooled and solidified with the binder supersaturated with Cr and C [10,12].…”