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High-velocity air-fuel (HVAF) spraying and detonation spraying (DS) methods are used to produce the Al-Cu-Fe-Sc coatings from a water-atomized powder on a low-carbon steel (Q235/SS330) substrate. X-ray diffraction phase analysis shows that the protective AlCuFeSc coatings produced by these methods contain different volume fractions of quasi-crystalline (QC) iphase. Wear and friction behaviour of the produced AlCuFeSc coatings is studied in the dry and wet conditions depending on the loading type (quasistatic or dynamic) for various counter-bodies (Si3N4, WC-Co hard alloy, or 52100 bearing steel). The effects of the coating-surface roughness and the QC i-phase content are also analysed.

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