Tribological Investigation of Detonation Sprayed Ni-Cr And Al 2 O 3 13Tio2 Coatings On Grey Cast Iron To Enhance Its Wear Resistance
This paper is concerned with the investigation of the capability of Detonation sprayed Ni-Cr And Al2O3 13TiO2 coatings to improve the tribological and mechanical properties of grey cast iron. The present study describes and compares the mechanical and tribological properties of NiCr and Al2O3 13TiO2 D-Sprayed coatings deposited on two different substrates (GI250 and GIHC) Experiments using a tribometer (pin on disc) is performed in order to evaluate the wear properties. The coating microstructures were characterised by SEM and EDAX. Cumulative weight analysis is done to compare the wear loss in weight and its concluded Al2O3 13TiO2 form a good bond with GI250 using Detonation spray process.
The tribological behaviour of detonation sprayed coatings: the importance of coating process parameters
The tribological performance of thermal spray coatings depends on a host of properties like coating composition, nature of phases and their distribution, microstructure, porosity and residual stress. All these properties, in turn, determine the hardness of the coating, which is conventionally used as the primary correlating parameter for evaluating wear resistance. To assess such an interrelationship in the case of detonation sprayed coatings, large varieties of coatings and each coating over a range of process parameters have been deposited utilizing the detonation spray (DS) coating technique. The resulting coatings (94 in all) have been characterized in terms of phase content and distribution, porosity, microhardness, and evaluated for erosion, abrasion and sliding wear resistance. A broad-brush analysis of the data obtained clearly points to the fact that the coatings are substantially poorer than bulk material of identical composition and that the hardness and tribological properties of the coatings are more strongly influenced by the coating process parameters themselves rather than microstructural parameters like phase content and distribution, porosity, etc.
Alternative to chrome: HVOF cermet coatings for high horse power diesel engines**
Abstract High velocity oxygen fuel sprayed face coatings have shown great promise for piston rings used for high power density diesel engines. Various coatings have been tested on both wear test rigs and in an engine. A highly dense HVOF cermet coating was developed with reasonable crack resistance during service. The HVOF coated piston rings wore three to six tunes lower than chrome plating. Cylinder liner (counter face) wear was found to be one to three times higher than chrome. The HVOF coating is considered to be an excellent replacement for chrome plating. The coating process is more environmentally friendly than the chrome plating process. Also, the coating has potentially lower or equivalent production cost when compared to chrome.