To investigate the evolutions of structures and properties of NiCrBSi coatings on cylinder liner of engines during its service, atmospheric plasma sprayed (APS) NiCrBSi coatings were heat treated at 300, 500, or 700 °C in this work. The effect of heat treatment on microstructure, phase composition, microhardness and tribological performance has been investigated. It was identified that as-sprayed coatings mainly consisted of γ-(Ni, Fe) phase while CrB and Ni 3 B phases precipitated from the coatings during the heat treatments at 500 and 700 °C. In addition, inter-splat oxidation of the coating during the heat treatment occurred. Moreover, the crystallinity of the coating was significantly enhanced with increasing the heat treatment temperature. The heat treatment improved obviously the microhardness whereas it did not exert a pronounced effect on the friction coefficients of the coatings. In spite of the enhanced microhardness, the heat treatment at 700 °C increased the wear rate comparatively. It was revealed that inter-splat debonding of the coating surface layer involved in the friction dominated the wear resistance of the coating. Inter-splat oxidation and reduction of coating toughness due to heat treatment can account for the increased wear rate.

Effect of heat treatment on structure and property evolutions of atmospheric plasma sprayed NiCrBSi coatings

Combustion, performance, and emission characteristics of low heat rejection engine operating on various biodiesels and vegetable oils

Optimizing wear behavior of TiN coated SS 316L against Ti alloy using Response Surface Methodology

Friction and wear in different engine components have crucial effects on the engine performance, combustion efficiency, oil consumption and lifetime of the internal combustion (IC) engine. Under certain loads, speeds, and temperatures, the metallic components of the IC engine, especially the piston and valve system suffer from a higher friction. Thin film coating is one of the novel techniques to reduce the frictional forces and improve the mechanical properties of engine components. Due to some versatile tribological properties, increasing attention has been paid to the physical vapor deposition (PVD) technology in the recent decade to deposit thin film coating on engine components. This article presents a comprehensive literature review on thin film coatings for IC engine components deposited by PVD technique. Issues related to tribological properties (wear and coefficient of friction) and mechanical properties (hardness and roughness) are also highlighted. Scientific improvements are presented ...

A Critical Review on Physical Vapor Deposition Coatings Applied on Different Engine Components

Lubrication of PVD coatings with ethyl-dimethyl-2-methoxyethylammonium tris(pentafluoroethyl)trifluorophosphate

Surface properties of CrN coated engine cylinders

Wear behavior of a crankshaft journal bearing manufactured by powder spraying

In this study, the hardfacing behavior of Cr – Ni stainless steel was studied by depositing of Stellite 1, Stellite 6, and Stellite 12 superalloys on Cr – Ni stainless steel specimens using electric arc welding and tungsten inert gas welding. The cobalt base alloys were hardfaced on stainless steel plates as a single layer. The samples taken from the hardfaced materials were studied by optical microscopy, scanning electron microscopy, X-ray diffraction, and microhardness measurements. The hardness and wear resistance values of the layer obtained after the hardfacing processes are satisfactory and the process seem to be suitable for application.

Mustafa Nursoy

Papers

Surface properties of CrN coated engine cylinders

Wear behavior of a crankshaft journal bearing manufactured by powder spraying

Hardfacing behavior of Cr-Ni stainless steel with Co-based super alloys