Fretting wear behaviour of FeNiBSiCe alloy flame sprayed coatings

The fretting wear properties of FeNiBSiCe alloy coatings coupling with SAE52100 steel under reciprocating sliding were examined by using a ball-on-disc reciprocating tribotester. Effects of load and sliding speed on fretting tribological properties of the coatings were studied. Worn surfaces of the coatings were analyzed by a scanning electron microscopy (SEM), a field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS), respectively. The friction coefficient of the coatings decreased slightly with the load, but increased with sliding speed at first, and then tended to be a constant value. The wear rate of the coatings increased with the load, but dramatically decreased at first and then slightly decreased with the sliding speed. An adhered oxide debris layer was formed on the worn surface in friction. Fretting wear mechanism of the coatings was microplough at normal load, microfracture, oxidation wear and a large amount of counterpart material was transferred to the coatings at high load and high sliding speed.