The Role of Bond Coat in Advanced Thermal Barrier Coating

Abstract:

A novel diffusion barrier bond coat with a duplex layer structure, a sigma phase Re-Cr-Ni barrier and Ni aluminides as an aluminum reservoir was formed on a Ni based superalloy (TMS 82+) and Hastelloy X. The oxidation behavior of both alloys with and without the sigma- Re-Cr-Ni -phase as a diffusion barrier was investigated at temperatures of 1373K (Hastelloy X) and 1423K (TMS-82+) for up to 360ks. It was found that the Re-Cr-Ni acts as a diffusion barrier for both inward diffusion of Al and outward diffusion of alloying elements in the alloy substrate.

• Periodical: Materials Science Forum (Volume 502)
• Pages: 99-104
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.502.99
• Online since: December 2005
• Authors: Toshio Narita, Shigenari Hayashi, Feng Qun Lang, Kemas Zaini Thosin
• Keywords: Diffusion Barrier Coating, Hastelloy X, High Temperature Oxidation, Nickel-Based Superalloy, Re-Based Alloys

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DOI: 10.1016/0956-716x(94)90102-3

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