Tribological Properties of B4C-Ni Cermet Coating Produced by HVOF Process on the Surface of 4130 Steel

Document Type: Research Paper

Authors

1 Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran

3 Department of Materials and Metallurgical Engineering, Faculty of Engineering, Arak University, Arak 38156- 8-8349, Iran

Abstract

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.

Keywords


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