Nb and Mo Influencing the High-Temperature Wear Behavior of HVOF-Sprayed High-Entropy Alloy Coatings

To qualify high-entropy alloys (HEAs) as resource-saving and high-temperature wear-resistant coating materials, high-velocity oxygen fuel (HVOF) coatings produced from the inert gas-atomized powder of Al0.3CrFeCoNi, Al0.3CrFeCoNiNb0.5 Al0.3CrFeCoNiMo0.75 were investigated in reciprocating wear tests at temperatures 25, 500, 700 900 °C. In addition to tests, microstructure chemical composition three HEAs analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) X-ray diffraction (XRD). particular, HVOF are characterized by high hardness (Vickers HV0.1) low porosity, which also determined. After depth was measured laser (LSM). It found that adding Nb Mo Al0.3CrFeCoNi significantly reduces with increasing temperature. The mechanisms change abrasive delamination (25 °C 500 °C) a combination (abrasion), delamination, adhesion oxidative wear. Thereby, will be primary mechanism for all investigated. most important finding is oxide layer formed improved Mo, resulting reduced