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چکیده
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In this research, B4C-Ni cermet coating was sprayed on the surface of 4130 steel from B4C and Ni feed-stock powders using high velocity oxy-fuel (HVOF) method. In order to characterize the tribological behavior of the coating, ball on disk wear tests were done at the ambient temperature and under the loads of 1, 3 and 5 N. Phase analysis of the coating after spraying was studied by X-ray diffractometery (XRD). Microstructure of the coating and wear track was evaluated by scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS). The microhardness test was done to measure the hardness of the produced coating. It was found that a good coating with suitable interface and no significant pores and cracks in the microstructure of coatings was formed. The main wear mechanism of the coating was delamination with some oxide layers due to the frictional heat during wear test.
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