Abstract
The aims of this study were: (1) to produce composite coatings by high velocity oxy fuel (HVOF) spraying with steel matrix reinforced by cermets (a) Cr3C2–20%Ni and (b) TiC–20%NiMo, manufactured by mechanically activated synthesis (MAS); (2) to synthesize in situ a carbide reinforcement for iron matrix from a mixture of titanium and carbon during HVOF reactive thermal spraying (RTS); (3) to compare the wear resistance of produced coatings. As a reference, HVOF sprayed coatings from commercial Cr3C2–25%NiCr (Amperit 588.074) and AISI 316L were utilized. Study of microstructure revealed the inhomogeneity of the Cr-based MAS coating; the Ti-based MAS coating had typical carbide granular structure, and the Ti-based RTS coating possessed elongated structures of TiC. The X-ray diffraction revealed two main phases in the Cr-based MAS coating: Cr3C2 and austenite, and two phases in the Ti-based coatings: TiC and austenite. Among the studied coatings, the Cr-based MAS coating demonstrated the highest low-force hardness (490 HV0.3). During the abrasive rubber wheel test (ASTM G65), the Ti-based MAS coating showed the best wear resistance, followed by Cr3C2–25%NiCr and Ti-based RTS coating. In the abrasive–erosive test (GOST 23.201-78), the Ti-based MAS coating was 44% better than Cr3C2–25%NiCr coating. The Ti-based RTS coating was 11% more wear resistant than the reference Cr3C2–25%NiCr coating.
Highlights
Transition metal carbide-based cermet coatings obtained by thermal spraying are deservedly appreciated in the industry for their superb durability
The present study addresses high velocity oxy fuel (HVOF) sprayed composite stainless steel-based coatings with the
The analysis has revealed the presence of two main phases in each coating
Summary
Transition metal carbide-based cermet coatings obtained by thermal spraying are deservedly appreciated in the industry for their superb durability. Good resistance to erosion is required in cyclone dust collectors used in the recycling industry or in hydroelectric valves of water dams. The oil and building industries use equipment like slush-pump piston rods or concrete mixer screw conveyors, which need to stay resistant to abrasive wear [1]. The relatively high production costs of the feedstock cermet powders still limit their broader application [2,3]. One of the reasons is the high expenditures for the transition metals used for their production.
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