Oxidation Resistance HVOF Sprayed Coating 25% (Cr3C2- 25(Ni20Cr)) + 75%NiCrAlY on Titanium Alloy
Year: 2014
Type: article
Abstract: The titanium alloys posses good affinity towards oxygen at elevated temperature in air and thereby leading to oxidation. The current paper presents the oxidation behaviour of titanium alloy, Ti-6Al-4 V at elevated temperature. The degradation of the alloy oxidation mechanism is described in detail. Rapid degradation or the inability to repair these complex material results in excessively high operating costs. A suitable protective HVOF coating 25% (Cr3C2-25(Ni20Cr)) + 75% NiCrAlY was sprayed on Ti-31 alloy to combat oxidation to improve the life and efficiency of components. Thermogravimetric technique was used to study the high temperature oxidation behaviour of bare and coated alloy at 800 °C for 50 cycles, 1 hr heating in tube furnace and 20 minutes colloing in atmospheric temperature. The oxidized products are analyzed using XRD and SEM/EDX. It is observed that a coating has less porosity and semi melted powder particles in the structure. Also the coating has imparted necessary oxidation resistance by formation of chromium and nickels oxides.
Source: Procedia Materials Science
Authors: N. Jegadeeswaran, M.R. Ramesh, K. Udaya Bhat
Institutions: REVA University, National Institute of Technology Karnataka
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W1998569759