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Vol.42, No.2, 160 ~ 167, 2004
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| Title |
| NiAl-Ti-Y Coating Deposition for Improvement of Oxidation Resistance of Cold-Rolled NiA1 Thin Foils |
| 김수현 Kim Su Hyeon , 오명훈 O Myeong Hun , 위당문 Wi Dang Mun , Kyosuke Kishida , Toshiyuki Hirano |
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| 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. |
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| Key Words |
| Ni3Al thin foil, NiA1 coating, Oxidation resistance, RF magnetron sputtering, Floating zone method |
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