Metals that work at high temperatures (for instance, superalloys in gas-turbines) depend on thermally grown oxide (TGO, commonly alumina) to withstand corrosion attack. Nickel Aluminide (NiAl) as one superior alumina TGO former plays an important role in protective coatings for turbine blades in gas-turbine engines used for aircraft propulsion and power generation. Lowering TGO growth rate is e...

The oxidation of both low and high-activity simple and Pt-modified aluminide coatings on nickel base superalloy IN738 has been studied in static air at 1100 OC up to 1000 h. For all coatings oxidation followed a parabolic law up to 400 h. The two Pt-modified coatings showed better protectiveness with lower mass gains and smaller rate constants, especially for long reaction times. The presence o...

The three dimensional (3D) microstructural evolution of A206 (AlCu4.5Mg0.3) and AlCu7 alloys is studied as function of solution treatment (ST) time by synchrotron tomography. 3D microstructural parameters of rigid phases such as volume fraction, interconnectivity (volume of biggest aluminide/total aluminide volume) and contiguity (touching surface) are presented. In situ synchrotron tomography ...

In the present article doping of aluminide coatings by Pt/Pd as well Hf or Pd using industrial processes was developed. The different combinations elements were tested their influence on chemical composition initially investigated. Pt and both + electroplated surface MAR M247 nickel superalloy. Zr doped during low activity CVD aluminizing process Bernex BPX Pro 325S system. conducted research s...

In this paper, mechanical properties of the as-received and aluminide layer coated MAR 247 nickel based superalloy were examined through creep fatigue tests. The 20 µm was obtained chemical vapor deposition (CVD) process in hydrogen protective atmosphere for 8 h at temperature 1040 °C internal pressure 150 mbar. A microstructure characterized using scanning electron microscopy (SEM) X-ray Energ...