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Oxidation of two different Pt-aluminised bond coats

Schennach, Friederike (2012)
Ph.D. thesis, University of Birmingham.

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Two different Pt-aluminised bond coats, with varying thicknesses and Pt-contents were examined, regarding the in uence of bond coat phases on the oxide growth. This was done in a series of short term (3, 7 and 10 minutes) oxidation experiments at 1100°C. These clearly showed different types of oxide growing on Ni3Al and NiAl phases in the low Pt specimens. It could also be shown that the transition from NiAl to Ni3Al already occurs at these early stages of oxidation. On the high Pt specimens the same types of oxide are growing on Ni3Al and PtAl2.
In addition, the high Pt specimens were examined after longer times at temperature (up to 100 hours), to gain information on the bond coat phase transformations happening at high platinum contents. It could be shown that the chromium content plays an important role with regards to phase stability fields in the ternary Ni-Al-Pt diagram. Oxidation kinetics on these samples show that the oxide is not growing at a parabolic rate, but is characterized by a time exponent of 0.145, which may be attributed to a theta to alpha a transformation in the oxide.

Type of Work:Ph.D. thesis.
Supervisor(s):Jones, Ian P. and Evans, Hugh
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TA Engineering (General). Civil engineering (General)
TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:3231
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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