| Title |
NiAl-Ti-Y Coating Deposition for Improvement of Oxidation Resistance of Cold-Rolled NiA1 Thin Foils |
| Authors |
김수현(Kim Su Hyeon); 오명훈(O Myeong Hun); 위당문(Wi Dang Mun); (Kyosuke Kishida); (Toshiyuki Hirano) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Ni3Al thin foil; NiA1 coating; Oxidation resistance; RF magnetron sputtering; Floating zone method |
| Abstract |
Since the intermetallic compound Ni_(3)Al has attractive high-temperature properties, Ni_(3)Al thin foils could be used as lightweight, high-temperature structural materials. The floating zone (FZ) method makes it possible to fabricate the thin foils with smooth and crack-free surface by cold rolling up to 96% without any intermediate annealing steps. For the practical application of Ni_(3)Al foils, the other properties such as oxidation resistance, wear resistance and friction resistance should be considered. The 3-NiAl, which is one of the important intermetallic compound in Ni-Al systems together with γ-Ni_(3)Al, have been used as coating materials of Ni-base superalloys because of its excellent oxidation resistance. In this study, the NiAl-based coating was intended to deposit on the Ni_(3)Al foils through RF magnetron sputtering. The binary Ni-50Al coating, however, was not able to form the stable α-Al_(2)O_(3) oxide. Moreover, the rapid Al diffusion between coating layer and substrate was occurred. On the contrary, it was found that the Ni-47Al-3Ti-0.1Y coating showed superior oxidation resistance due to stable α-Al_(2)O_(3) formation and good retardation of Al diffusion from coating layer. |