Development of a NiW In Situ Diffusion Barrier on a Fourth Generation Nickel-Base Superalloy |
| Journal |
Materials Science Forum (Volumes 595 - 598) |
| Volume |
High Temperature Corrosion and Protection of Materials 7 |
| Edited by |
Pierre Steinmetz, Ian G. Wright, Alain Galerie, Daniel Monceau and Stéphane Mathieu |
| Pages |
23-32 |
| DOI |
10.4028/www.scientific.net/MSF.595-598.23 |
| Online since |
September, 2008 |
| Authors |
Eric Cavaletti,
Sebastien Mercier,
Denis Boivin,
Marie Pierre Bacos,
Pierre Josso,
Daniel Monceau
|
| Keywords |
Bond Coatings, Diffusion, Diffusion Barrier, Electrolytic Coating, Secondary Reaction Zone (SRZ), Thermal Barrier System |
| Abstract |
A diffusion barrier based on a NiW electrolytic coating has been developed to limit
interdiffusion between a Ni-base superalloy (MCNG) and a β-NiAl bondcoating. Isothermal
oxidation tests of 50h at 1100°C confirmed that W-rich layer formed with NiW coating modifies the
oxidation behaviour of the bondcoat and limits interdiffusion. The diffusion barrier reduced
β-NiAl γ’-Ni3Al transformation in the bondcoating and prevented SRZ formation. |
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