Journal
COATINGS
Volume 10, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/coatings10070701
Keywords
high-entropy alloy; HEA; coating; HVOF; boriding; precipitation; phase formation; microstructure; wear
Categories
Funding
- German Research Foundation (Deutsche Forschungsgemeinschaft/DFG) [La-1274/54-1]
- European Social Fund ESF [SAB-100382175]
- Free State of Saxony
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The application of high-entropy alloys (HEA) in surface technology has great potential due to the high corrosion and wear resistance. A further improvement can be achieved by applying thermochemical treatments. Powder-pack boriding enables the formation of a protective precipitation layer. This process has already been applied for cast HEAs causing the formation of a diffusion-enriched surface layer and a distinct increase in wear resistance. In the current investigations, the alloy CrFeCoNi with a single-phase face-centred cubic (fcc) structure is considered. An efficient application can be achieved by limiting the material usage of HEAs to the surface. Therefore, the high-velocity-oxygen-fuel (HVOF) thermal spray process is applied. Boriding was conducted with an adapted powder-pack routine. Furthermore, borided bulk HEAs were considered as a reference. The influence of the production route and boriding treatment on the microstructure, phase formation, and properties was investigated in detail. For the coating and the cast HEA, a precipitation layer is formed. Hence, the hardness and wear resistance are significantly increased. The current study proves the suitability of the investigated process combination.
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