ABSTRACT Nanostructured coatings of NiCr/WC (70％ WC, 30％ NiCr) were prepared via actived -combustion -high velocity air fuel (AC-HVAF). Fretting wear test was carried out by SRV high temperature wearingequipment. The results show that the thermal sprayed NiCr/WC nanostructured coating prepared from the spraying distance of 160 mm has the best fretting wear properties under the same other process parameters,and the nanostructured coating prepared from the spraying distance of 200 mm has the worst fretting wear properties. The nanostructured coating prepared at the powder feed rate of 15 rpm has the best fretting wear properties under the same other process parameters, the nanostructured coating prepared at the powder feed rate of 5 rpm has the worst fretting wear properties, respectively. In addition, compared to the carburizing bearing steel 20CrNi2Mo with excellent overall performance, the wearing resistances of all nanostructured coatings are better than that of the carburizing bearing steel under the same wear conditions.
KEY WORDS nanostructured NiCr/WC coating; fretting wear properties; wearing resistance
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