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Characterization of the Degraded Microstructures of a Platinum Aluminide Coating

Published online by Cambridge University Press:  17 March 2011

Hyungjun Kim  and
Mark E. Walter
Hyungjun Kim
Affiliation:
Mechanical Engineering Department, The Ohio State University Columbus, OH 43210, U.S.A.
Mark E. Walter
Affiliation:
Mechanical Engineering Department, The Ohio State University Columbus, OH 43210, U.S.A.
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Abstract

To investigate phase evolution of β-(Ni,Pt)Al/γ-(Ni3Al) in thermal barrier coating bond coat systems, specimens were subjected to 1200°C cyclic and isothermal heating. By removing the thermally grown oxide (TGO) after every 10 hours of heating, aluminum (Al) depletion from the bond coat was accelerated. Non-accelerated and accelerated Al-depletion samples were examined with scanning electron microscopy after every 10 hours of cyclic and isothermal heating. Observations from after the first 10 hours of thermal exposure show distinct microstructural differences. After 50 hours of heating, cyclic accelerated Al-depletion samples show more distinct grain boundaries and a higher proportion of-(Ni3Al) phase than isothermalaccelerated Al-depletion samples. Through instrumented micro-indentation, trends in elastic modulus were determined for isothermal and cyclic accelerated Al-depletion specimens.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 697: Symposium P – Surface Engineering 2001--Fundamentals and Applications , January 2001 , P4.2
Copyright
Copyright © Materials Research Society 2002

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