Morphology and microstructure of Yb2O3 layer formed over aluminide coating produced by pack cementation of Haynes® 263 alloy

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

“…The coated nickel-based superalloy exhibited superior oxidation resistance as compared to its wrought state. Recently, Morgiel et al [8] proposed a novel pack cementation approach during which the NiAl coating system was modified with rare earth elements. The studies confirmed the successful formation of a very thin (<10 nm) amorphous layer of Yb2O3 that may decrease the cavitation erosion and oxidation.…”

“…The formed NiAl layer was well adhered to the substrate material and was characterized by improved hardness of 40HRC due to the precipitation of the δ-Ni 3 Nb-hardening phase inside the grains of the solid solution γ. Gloria et al [7] presented optimized halide-activated pack cementation technology for the Mar-M246 alloy, the effectiveness of which was assessed through hightemperature oxidation tests in air up to 1000 • C. The coated nickel-based superalloy exhibited superior oxidation resistance as compared to its wrought state. Recently, Morgiel et al [8] proposed a novel pack cementation approach during which the NiAl coating system was modified with rare earth elements. The studies confirmed the successful formation of a very thin (<10 nm) amorphous layer of Yb 2 O 3 that may decrease the cavitation erosion and oxidation.…”

“…It could be noticed that PC methods are mainly used to deposit pure NiAl or β-NiAl coatings [6,7,[12][13][14][15][16][17]23,24]. Some reports analyze the addition of different oxides [8,9] and Zr [18][19][20].…”

“…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.…”

“…A summary of the pack cementation-related research[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”