Effect of MoS2 Addition on High Temperature Wear Behavior of NiCrBSi Coating Produced by Thermal Spraying

Subject Areas : journal of New Materials

Mohammad Razazi Boroujeni ¹ (Assistant prof. of Materials Engineering, Department of Materials Engineering, Lenjan Branch, Islamic Azad University, Isfahan ,Iran)
Hind Khalaf Shayea Al Fadhli ² (MSc student of Materials Engineering, Department of Materials Engineering and Metallurgy, South Tehran Branch, Islamic Azad University, Tehran, Iran)
Farhad Azimifar ³ (Assistant prof., Department of Biomedical Engineering, Islamic Azad University, Isfahan branch, Isfahan, Iran)

Received: 2023-12-06 Accepted : 2024-03-09 Published : 2023-07-23

Keywords: Wear, Thermal spray, molybdenum sulfide, wear mechanism, 304 stainless steel,

Abstract :

Abstract Introduction: The thermal spraying method with the aim of increasing the working life of steel parts is one of the most important solutions in surface engineering to solve the problem of wear. Methods In this research, NiCrBSi and NiCrBSi-MoS₂ coatings were applied on 304 stainless steel by thermal spraying, and then the wear behavior was evaluated at ambient temperature and 500 degrees. Phase investigations were done by X-ray diffraction test. The chemical composition of the coatings was checked with the help of energy dispersive spectrometer analysis. Porosity was investigated with the help of optical microscope and scanning electron microscope images. The hardness of the samples was measured using a microhardness test. In order to check the adhesion and tribological behavior of the coatings, VDI3198 and ASTM-G99 pin-on-disk tests were used, respectively, and finally, the wear mechanism was evaluated using SEM images and EDS analysis of the wear surfaces of the samples. Findings: Phase analysis (XRD) and chemical composition (EDS) showed that the coating has an amorphous and crystalline phase and the most important phases of the coating are nickel-gamma, carbide and boride. Porosity measurement results with the help of image analysis software showed higher porosity of NiCrBSi-MoS₂ coating. The results of hardness measurement from the cross-section of the samples indicated an increase in the hardness of the substrate in the presence of coatings, and the addition of MoS₂ particles decreased the hardness of the NiCrBSi coating. The coating with MoS₂ has better adhesive behavior due to its crystalline structure and better plastic deformation ability. The tribological results indicated the superiority of the NiCrBSi-MoS₂ coating due to the appropriate ability of plastic deformation as well as the intrinsic lubrication property (based on the crystal structure) in this test. It was found that at ambient temperature, the samples mainly had lamellar wear mechanism, and at high temperature, oxidation wear as a secondary mechanism helped to destroy the surface. Conclusion: The addition of MoS₂ to NiCrBSi coating caused more porosity, more roughness, less hardness and better wear behavior of the coating. The addition of MoS₂ to the coating improved the wear resistance of the coating at high temperature.

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