During high velocity oxy-fuel (HVOF) thermal spraying, most powder particles remain in solid state prior to the formation of coating. A finite element (FE) model is developed to study the impact of thermally sprayed solid particles on substrates and to establish the critical particle impact parameters needed for adequate bonding. The particles are given the properties of widely usedWC-Co powder...

In fossil fuel power generation plants, steam generation tubes and turbine blades are critical for overall performance of plant. The materials are subjected to bear heavy wear and temperature during operation. The manufacturer has an option of using high wear resistant and high temperature materials which are costlier or using cheaper materials with ceramic coatings over it. The coatings expose...

The objective of this study was to mimic the microstructure of MCrAlY coatings sprayed using HVOF (High Velocity Oxy-Fuel) processes by using an Air Plasma Spray (APS) process in order to improve oxidation and spallation life of MCrAlY APS coatings. Figure 1 shows the typical microstructures obtained when spraying bond coats using the (a) HVOF process, and (b) the APS process. The microstructur...

Abstract A growing understanding of wear behavior various thermally sprayed ceramic–metallic matrix coatings has occurred over recent years. This resulted from the continuous evolution in spraying methods as well material feedstock, and corresponding new aspects field that have been thoroughly explored. paper aims to review developments tungsten carbide-based coatings, with specific emphasis on...

A novel composite coating was developed by depositing powders of Titanium Carbide (TiC) with Cupronickel (70Cu-30Ni) and Chromium (Cr) as binders onto SS316 steel specimens using the High Velocity Oxy Fuel (HVOF) process. The coatings were characterized Energy Dispersive Spectroscopy (EDS) Scanning Electron Microscopy (SEM), their surface hardness, roughness, porosity evaluated. cavitation eros...

The incorporation of graphene-based nanodispersoids in ceramic coatings is known to enhance the wear behavior these materials. In this study, for first time, alumina/graphene nanoplatelets (GNPs) were deposited through Suspension High Velocity Oxy-Fuel (SHVOF) thermal spray on Al2O3/TiC substrate composites, which laser microtextured with grid and line surface patterns. Dense around 8?10 ?m thi...

The use of the cold gas spray (CGS) process as a metal additive manufacturing (MAM) technique for metallic part production has been deeply studied recently, mainly due to its advantages over other MAM techniques. CGS is high-productivity with very low level particle oxidation, microstructural changes, phase transformations, or deleterious residual thermal stresses in part. produce maraging part...

Gadolinium zirconate (GZ) is an attractive material for thermal barrier coatings (TBCs). However, a single layer GZ coating has poor cycling life compared to Yttria Stabilized Zirconia (YSZ). In this study, Solution Precursor High Velocity Oxy-Fuel (SP-HVOF) spray was used produce double GZ/YSZ TBC and the performance with YSZ TBC. The temperature behaviour of solution precursor studied, splat ...

We have deposited a series of WC–Co coatings by the high velocity oxy fuel (HVOF) process, using three different powders, and different spray conditions. The powders are a nanocrystalline (Nanocarb), a near-nanostructured powder (Infralloy) containing a proprietary additive aimed at retarding grain growth, and multimodal (mixed micro and nano) powder (Nanomyte). HVOF spray conditions were stoic...