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Development of New Bond Coat System in Ni-Base Alloys

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Abstract:

Ni-base single crystal (SC) superalloys containing high concentrations of refractory elements are prone to generate a diffusion layer called Secondary Reaction Zone (SRZ) beneath their bond coating during exposure at high temperatures. SRZ causes a reduction of the load bearing cross section and is detrimental to the creep properties of thin-wall turbine airfoils. In this study, a new coating system – “EQ coating”, which is in thermodynamic equilibrium with the substrate, has been proposed and the formation behavior of SRZ beneath bond coat materials was investigated on the 5th generation Ni-base SC superalloy developed by NIMS. Diffusion couples of several alloys were made and were heat treated at 1100°C for 300 h, 1000 h. The concentration profiles were analyzed by EPMA. Also, cyclic oxidation tests were carried out at 1100°C in air.

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Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

361-368

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.361

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Online since:

August 2006

Authors:

Akihiro Sato, Hiroshi Harada, Kyoko Hashi Kawagishi

Keywords:

Bond Coat, Diffusion, Ni-Based Single Crystal Superalloy, Phase Transition, Secondary Reaction Zone (SRZ), Thermodynamic Equilibrium

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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