Publication: Improvement of high temperature oxidation resistance of γTiAl alloys by slurry coatings
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2014
Defense date
2014-07-14
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Abstract
This research document aims to deepen the understanding of slurry coatings as
an effective barrier against the oxidation of promising Titanium-aluminide intermetallic
alloys. For that purpose, the research is carried out with a Titanium-
Aluminum alloy substrate {(Ti 45Al 2Nb 2Mn + 0.8%vol TiB2){ which was
manufactured by means of two different techniques: Hot Isostatic Pressing (HIP)
and Centrifugal Casting (CC).
Additionally, two different slurry coatings have been applied and analyzed in
order to understand the effects they produce. One of them was based on Aluminum
powders and the other on a mixture of Aluminum-Boron powders. Both
carry polyethylene glycol (PEG) as a binder.
A total of twenty four samples were used, from which twelve were manufactured
by hot isostatic pressing and the remaining twelve by centrifugal casting.
Each group of twelve pieces was divided in three subgroups, each made up of
four samples. The first subgroup was subjected to oxidation without having any
coating, the second was coated by the aluminum slurry and the third by the
aluminum-boron slurry.
The samples were oxidized in static air for 300 hours at 800ºC (1073 K) in
an interrupted oxidation test.
Finally, the characterization of the samples was performed by means of massgain,
X-Ray diffraction and Scanning Electron Microscope (SEM) analyses.
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Keywords
Oxidación, Aleaciones, Metales, Materiales de recubrimiento, Ensayo de materiales, Titanio