Abstract: Two different coating microstructures of Ni-50Cr alloy were obtained on a stainless steel substrate by changing combustion characteristics of a high velocity oxy-fuel (HVOF) process and the size distribution of feed powder during coating process. Use of the finer feed powder and leaner fuel in oxygen/fuel ratio (i.e. using a ratio much less than stoichiometric ratio) led to formati...

Abstract The effect of impact velocity and temperature invar particles deposited by high-velocity oxygen fuel (HVOF) cold spray processes on the microstructure oxidation content coatings is not fully understood. Additionally, coating thickness coefficient thermal expansion (CTE) coated material influence working hardness are also insufficiently investigated. In present study, were at temperatur...

Effective testing of ceramic matrix composites (CMCs) and CMC/coating systems for high temperature, stress, velocity and/or severe oxidation/corrosion environments is a critical need in materials/coatings evaluation extreme hot section parts jet engine hypersonic applications. Most current technology can evaluate two or three the conditions given application; however, incorporating as many ther...

Abstract The paper presents the computational studies on microstructure of WC-Co-Cr coatings deposited by High Velocity Oxy Fuel spraying (HVOF). study covers porosity assessment according to ASTM E2109-01 standard, carried out in ImageJ software, terms volume porosity, size and shape pores. evaluation was preceded scanning electron microscope (SEM) observations at magnifications 2000x 5000x. A...

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...

The phenomenon of cavitation is widely experienced in both pumps and under-water components of hydro power plants. The mechanism of material damage during cavitation is mainly attributed to implosion of high velocity bubbles on to the surface giving raise to local increase in stresses in excess of 1.4 GPa. In addition, material wastage due to particle induced erosion is observed in hydro plants...

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...