Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Influence of high velocity oxy-fuel (HVOF) deposition process on cavitation resistance of tungsten carbide coatings
Submission Author:
Murilo Sérgio Lamana , PR
Co-Authors:
Anderson Geraldo Marenda Pukasiewicz, Murilo Sérgio Lamana
Presenter: Murilo Sérgio Lamana
doi://10.26678/ABCM.COBEM2017.COB17-0225
Abstract
Cavitation is a phenomenon which occurs due to the implosion of water vapor bubbles on a surface, leading to wear, and consequently mass loss. Cavitation erosion can cause damages to components, which can be protected by coatings to reduce the damage occurrence. Thermally sprayed coatings are very used to mitigate against wear applications, including cavitation. The HVOF spray process is one of the most used process, as it results in coatings with a good density, generating hard and tough coatings. Among the materials used in wear resistance, tungsten carbide coatings are the most used, because it offers the combination of high hardness, toughness and adherence that can provide a good cavitation resistance. In this work, the influence of different HVOF process, specifically the fuel type and torch used, on the microstructure and mechanical and cavitation properties of these coatings was studied. Also, the characterization and measuring of porosity, hardness and toughness was made. It was also noted that coatings deposited by HVOF with kerosene fuel, presented higher cavitation resistance, compared with coatings deposited by HVOF process with gas fuel.
Keywords
Cavitation Resistance, Tungsten Carbide, HVOF Deposition, Liquid and Gas Fuel
