Development of Oxidation-Resistant .BETA.-Phase EQ Coating System for Ni-Base Superalloys

DOI Web Site 5 Citations 2 References
  • Kawagishi Kyoko
    High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science
  • Sato Akihiro
    High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science Materials Technology Department, Research & Engineering Division, Aero-Engine & Space Operations, Ishikawajima-Harima Heavy Industries Co., Ltd.
  • Harada Hiroshi
    High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science

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Other Title
  • Ｎｉ基超合金におけるβ相を用いた耐酸化ＥＱコーティングシステムの開発
  • Development of Oxidation-Resistant β-Phase EQ Coating System for Ni-Base Superalloys

Description

  A new and stable bond coat system, EQ coating, which is in equilibrium thermodynamically with γ/γ′ substrate, suppresses the diffusion of alloying elements between the substrate and coating, and the formation of SRZ. In this study, β phase is proposed as the candidate for oxidation-resistant EQ coating material because of its high Al content. Combinations of γ/γ′ alloy for the substrate material and β alloy for the coating material which are in equilibrium were developed in Ni-Al-Cr ternary system and Ni-base multi-component system. Diffusion couples were made for each combination and were heat treated at 1100°C for 300 h. The concentration profiles of the alloying elements at the interfaces between the β alloy and γ/γ′ alloy in the diffusion couples were analyzed to investigate the existence of the diffusion zone. Cyclic oxidation examination was performed and oxidation properties were discussed.<br>

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