Oxidation Behavior of Nickel-Base Single-Crystal Superalloy with Rhenium-Base Diffusion Barrier Coating System at 1,423 K in Air
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The oxidation behavior of the nickel-base single-crystal superalloy TMS-82+ coated with a duplex Re(W)–Cr–Ni/Ni(Cr)–Al layer was investigated in air at 1,150 °C for up to 100 h. The coating layer was formed by electroplating Re(Ni) and Ni(W) films on the alloy, followed by Cr-pack cementation at 1,300 °C, and as a result, forming a continuous Re(W)–Cr–Ni diffusion-barrier layer. A Ni film containing fine Zr particles was then electroplated on the duplex layer, followed by Al pack cementation at 1,000 °C for 1 and 5 h to form an Al reservoir layer with a duplex Ni2Al3/γ-Ni layer, which changed quickly to γ-Ni phase containing (10∼13)at.% Al for the 1 h Al-pack coat and a mixture of γ′-Ni3Al and β-NiAl phases for the 5 h Al-pack coat during high-temperature oxidation. A protective α-Al2O3 scale formed during oxidation at 1,150 °C in air, and parabolic rate constants of 7.4 × 10−11 and 6.6 × 10−10 kg2 m−4 s−1 were obtained for the 1 h- and 5 h-Al pack-coatings, respectively. There was little change in the structures of the superalloy substrate after oxidation at 1,150 °C in air for up to 100 h. It was found that the Re(W)–Cr–Ni layer remained stable, acting as a diffusion barrier between the alloy substrate and Al reservoir layers.
KeywordsDiffusion barrier coating system Re-base diffusion-barrier layer Nickel-base single-crystal superalloy TMS-82+ High-temperature oxidation
The investigation was carried out with financial support from the Japan Science Technology (JST) and the New Energy and Industrial Technology Development Organization (NEDO). One of the authors (T. Narita) would like to cite David Young (U.NSW, Australia), Brian Gleeson (U.IS, USA), and Hideyuki Murakami (Tokyo University, Japan) for their useful discussion as members of the Smart Coating Team in NEDO international research 2002–2004.
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