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...

MCrAlY coatings (M=Ni and/or Co) have been widely used for the protection of superalloy components against oxidation and hot corrosion in the hot sections of gas turbines. The drive to improve engine combustion efficiency while reducing emissions by increasing the operation temperature brings a big challenge for coating design. As a result, the need for improvement of MCrAlY coatings for better...

Elemental diffusion drives the microstructure development in MCrAlY-superalloy systems at high temperature. In this paper, two models were built to simulate behavior of elements coating or coating–substrate system. Firstly, a core–shell model was set up investigate thermodynamic and kinetic localized microstructure. The results simulation successfully explained mechanism formation α(core)–γ′(sh...

MCrAlY coatings are deposited onto superalloys to provide oxidation and corrosion protection at high temperature by the formation of a thermally grown oxide scale. In this project, the oxidation behaviour of a HVOF CoNiCrAlYSi coating on IN792 was studied for both isothermal oxidation (900, 1000 and 1100 °C) and thermal cycling (100-1100 °C). The microstructural evolution of the CoNiCrAlYSi coa...

The application of metal-matrix composite coatings for protecting and improving the service life sliding components has demonstrated to have potential meeting requirements a diverse range engineering industries. Recently, significant body research been devoted studying mechanical tribological performance dispersion-strengthened MCrAlY coatings. These belong class emerging wear-resistant materia...