High temperature oxidation studies of NiCoCrAlY and NiCoCrAlY + Hf bond coats

Document Type

Conference Proceeding

Publication Date

12-1-2011

Abstract

Extensive studies are needed to understand the degradation of the bond coat materials and to estimate the oxidation rate. This study focuses on the study of the degradation of two types of bond coats: NiCoCrAlY and NiCoCrAlY + 0.25 wt% Hf, used commonly in industry for TBCs. Oxidation studies were performed by Thermo-Gravimetric Analysis (TGA) of the samples to measure the weight gain of different bond coat samples as a function of time and temperature. Isothermal oxidation tests at 1050, 1100, 1200 and 1250°C were performed for 5 hours. The test results showed that the protective oxide scale follows the typical parabolic rate for both materials. Experimental results also showed that the weight gain of the samples increased in accordance with time and temperature. The bond coat with hafnium followed the same trend and showed overall growth resistance when compared with bond coat without hafnium. Copyright © 2011 MS&T'11®.

Publication Source (Journal or Book title)

Materials Science and Technology Conference and Exhibition 2011, MS and T'11

First Page

1672

Last Page

1683

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