Cyclic oxidation resistance of Ce/Co modified aluminide coatings on nickel base superalloys

Review on Nickel Aluminide based Bond Coat Properties and Oxidation Performance for Thermal Barrier Coating (TBC) Application

“…This is because, low hafnium solubility also contributes to Hf-rich particle precipitation during oxidation [49]. However, approximately 0.3 at.% addition will diminish beneficial effect of Hf at 1150 °C or 1100 °C after only 100 1-h cycles leads to detrimental performance of the relatively thin coatings [50] . Based on work done by [54], the existed maximum crack length in the TBC and TGO thickness may be useful to the life prediction for overall TBC system.…”

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

“…Zirconium segregates at the coating/oxide interface and at the oxide grain boundaries and eliminates stresses in the oxide layer. Yttrium, hafnium and cerium are also added into the coatings to improve the oxide adherence during oxidation of coated superalloys [14][15][16][17][18]. These elements can be introduced to the superalloy substrates by melting or to the surface of superalloys by the ion implantation or by the MCrAlY overlay coatings՛ deposition [14].…”

“…Hafnium sulfides free energy formation value is negative, so hafnium dissolved in the aluminide coating and as a result, decreases sulfur activity in the superalloy [16]. Liu et al [17] performed cerium modification of the aluminide coating on the DZ125 superalloy. The modified coatings were deposited by the pack aluminizing process using 1 wt.%, 2 wt.% and 3 wt.% of CeO2 in the pack mixture.…”

“…The crucial issue in improving oxidation resistance of protective coatings is successful implementation of the proper amount of modifiers [8][9][10][11][12][13][14][15][16][17][18][19][20]. Oxidation resistance of modified aluminide coatings strongly depends on the correctly carried out electroplating and aluminizing processes.…”

Microstructure and Cyclic Oxidation Resistance of Ce-Si Modified Aluminide Coating Deposited by Pack Cementation on Inconel 738LC

“…The modified aluminide coatings improve the gas turbine performance by increasing turbine inlet temperature (TIT) and prolong the time between overhauls (TBO) of them [20,21]. Conventional aluminide coatings have been modified by adding beneficial elements such as chromium, silicon, cobalt, and platinum [17,[22][23][24][25] or by doping reactive elements (REs), e.g., hafnium, zirconium, cerium, lanthanum, yttrium, and other REs by using numerous techniques such as pack cementation, chemical vapor deposition (CVD), slurry, or co-diffusion methods [26][27][28][29][30][31][32][33][34]. Nonetheless, the addition of silicon into conventional aluminide coatings enhances the resistance against carburization, hot corrosion, and high-temperature oxidation [16,35,36].…”