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日本金属学会誌
Vol. 70 (2006) No. 2 P 192-195

記事言語:

http://doi.org/10.2320/jinstmet.70.192


  Advanced Ni-base single crystal (SC) superalloys containing high concentrations of refractory elements prone to generate a diffusion layer called Secondary Reaction Zone (SRZ) beneath their bond coating during exposure at high temperatures. SRZ cause a reduction of the load bearing cross section and it is detrimental to the creep properties of thin-wall turbine airfoils.
   In this study, a new bond coat system “EQ coating” designed to be in thermodynamic equilibrium with the Ni-based superalloy substrate has been proposed. Two types of EQ coating systems based on γ and γ′ compositions on the tie line of the base alloy (TMS-82+ or TMS-173) were studied and compared with a conventional bond coat. Each coating system was diffusion coupled with the substrate material and subjected to isothermal exposure at 1100°C for 300 hours. The results have indicated minimal interdiffusion occurred between EQ coating systems and the substrate. The EQ coating based on γ′ composition possesses the most promising oxidation resistance.

Copyright © 2006 (公社)日本金属学会

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