Temperature Effect on Early Oxidation Behavior of NiCoCrAlY Coatings: Microstructure and Phase Transformation

Recent Advances in the Deposition of Aluminide Coatings on Nickel-Based Superalloys: A Synthetic Review (2019–2023)

“…Although the successful methodology was presented, the improvement in the high-temperature lowcycle fatigue (HTLCF) was only about 5% as compared to the uncoated substrate material. Ullah et al [63] studied the initial oxidation behavior of an NiCoCrAlY coating deposited on a second-generation single-crystal nickel-based superalloy by using arc-ion plating in air at 900 • C, 1000 • C and 1100 • C. The authors highlighted that the oxide scale in the initial stage was mainly composed of θ-Al 2 O 3 at 900 • C, while α-Al 2 O 3 emerged with an increasing oxidation temperature. Furthermore, the beneficial effect of Y addition was reflected by its segregation at the scale/coating interface, which led to less cavity formation and hence improved the oxide scale adherence.…”

“…Interestingly, the most frequently modified nickel-based alloys are those with the highest oxidation resistance, possessing high mechanical strength. These involve Rene 80 [8,18,63], Inconel 625 [13,57,58], Inconel 713 [39,40,52], Inconel 718 [41], Inconel 738L [11,19,22,36,45,59,61,65,68] and CMSX-4 [17,30,42,44,46]. One should highlight that the research involving conventional nickel-based superalloys is mainly dedicated to future high-temperature applications.…”

“…Such trends enforce the need to enhance the durability of coatings as well. Therefore, rare earth elements, including zirconium [18][19][20], hafnium [21,60,66], palladium [46,66], rhenium [47,52,69] and platinum [49,51,52,63,66,[69][70][71], are frequently added to significantly extend the service temperature of nickel-based superalloys up to 1300 • C. One can conclude that their addition is extremely beneficial as not only the operating temperature increase but also the material stability of the coating is improved.…”

Analysis of the Coefficient of Linear Thermal Expansion of Sealing Coatings of Gas Turbine Engine Parts

“…It is known that appropriate proportions of yttrium contribute to the stabilization of oxide films, improve the adhesion of the applied coatings to the base material, increase the thermal stability of alloys and delay the coagulation of strengthening phases [2]. Segregation of yttrium (Y) at the interface between the oxide film and the coating in Ni-Co-Cr-Al-Y systems helps to reduce the formation of cavities and, thus, improves the adhesion of the α-Al2O3 oxide film to the substrate [3].…”