Microstructure, mechanical and tribological properties of high velocity oxy fuel thermal spray coating: A review

Abstract

Iron alloy based amorphous coating materials have enormous potential in wide range of applications such as petrochemical, aerospace, ocean, and electronic communications due to their better mechanical properties, chemical properties, magnetic properties and tribological properties. The industrial applications of coating are increasing rapidly due to many advancements in the material development and coating deposition techniques. The present paper reviewed the recent progresses in deposition technologies, development of new high order alloys and composite based coating materials. In this regard, change in microstructure, elemental composition, mechanical and tribological properties on performance of iron alloy based coating properties were presented. It can be concluded that the tribological properties of coating is dependent on pre-coating and post-coating factors. Pre-coating factors include coating deposition techniques, coating layer thickness and coating parameters such as spray distance, oxygen flow rate etc. Post-coating factors include microstructure, hardness, fracture toughness and adhesion strength. Therefore, multi-criteria decision making techniques can be the best approach to find the optimum formulation of coating materials to achieve desired set of objectives under the conflicting criteria.

HVOF Deposition, comparative investigation and optimum selection of molybdenum, boron, chromium, and titanium in Iron amorphous composite coatings

“…The fuzzy weights of each attribute of pairwise comparison matrix are obtained by the geometric mean method. The fuzzy geometric mean and fuzzy weights of each criterion are calculated using Equation (5).…”

“…This is mainly linked to the property of the feedstock powder [4]. Therefore, due to high amorphous content, the HVOF-deposited Fe amorphous composite coatings exhibited better dense structure, better mechanical properties, and excellent corrosion and wear resistance [5]. In general, in all properties such as corrosion resistance, hardness, and wear resistance, Fe-based coating is much superior to the base substrate such as 310L steel or 204 stainless steel [6][7][8][9][10][11].…”

Corrosion Prevention of Biomedical Implants: Surface Coating Techniques Perspective

“…The injection of powdery coating materials into the combustion chamber partially melts it and the hot jet mixture is thrusted onto the substrate to create the coating layer with varying thicknesses. This process can employ coating materials like hydroxyapatite, tungsten, aluminum, zirconium, and chromium including their oxides, carbides, or even polymeric materials, [82][83][84] has a highdensity coat, adheres well to substrates, and can be used on non-conductive materials.…”

Effects of heat treatment on microstructure and properties of Fe-based amorphous composite coatings

“…the hard phases of the coating 1# and 2# have reached saturation, so their microhardness can not be increased. (4) The corrosion resistance of Fe-based amorphous composite coatings is slightly improved after heat treatment, which rises with the increasing temperature. The corrosion resistance of the coating 1-2# is the best, because of the smaller porosity and the higher amorphous content.…”