The Influence of Overaluminizing on TGO Formation on Thermal Barrier Coatings Deposited by Low Pressure Plasma Spraying and Chemical Vapour Deposition Methods on Rene 80 Nickel Superalloy

Abstract:

The paper presents results of research into isothermal oxidation test of thermal barrier coatings characterized by high oxidation resistance and hot corrosion. Bondcoats were deposited by overaluminizing of MeCrAlY–type coating deposited by LPPS method. The outer ceramic layer of yttrium oxide stabilized zirconia oxide (Metco 6700) was deposited by plasma spray physical vapour deposition (PS-PVD). For comparison purposes additionally LPPS-sprayed were MeCrAlY bondcoats, which were not subsequently aluminized.. The isothermal oxidation test at 1100^oC for 1000h shown that thickness of the TGO layer in overaluminized bondcoat was significantly thicker in comparison with conventional LPPS-sprayed MeCrAlY bondcoats.

• Periodical: Solid State Phenomena (Volume 227)
• Pages: 321-324
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.227.321
• Online since: January 2015
• Authors: Marek Goral*, Maciej Pytel, Wojciech Cmela, Marcin Drajewicz
• Keywords: CVD Aluminizing, Hot Corrosion, Low Pressure Plasma Spraying, Plasma Spray Physical Vapour Depositon, TBC

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