Publication: Max-phase slurry coatings for high temperature oxidation protection of ti based alloys
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Publication date
2014
Defense date
2014-07-14
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Tutors
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Abstract
It is a well-known fact that degradation of materials due to phenomena such as oxidation,
corrosion or wear may result in early deterioration of a material. This deterioration can turn
out to be very expensive in industries such as the Aerospace one, where the price of a piece
can reach soaring figures and where the unexpected failure of a component can result
catastrophic.
Titanium is a material widely used in the aerospace industry thanks to its good mechanical
properties (high strength, low density and excellent corrosion resistance); however one of its
drawbacks is its poor oxidation resistance at high temperatures. The purpose of this project is
to be able to provide titanium with a coating capable of allowing it to improve its oxidation
resistance.
MAX phases on the other hand are relatively new materials with a Mn+1AXn stochoimetry,
where M is a metal, A is an A-group element and X is N or C. They are layered crystalline
compounds with a hexagonal structure. These ternary phases are characterized by having
extraordinary physical, chemical and mechanical properties related with their nanolayered
structure. Among their properties their excellent high-temperature mechanical properties and
their oxidation resistance makes them quite promising.
In this project, the slurry coating method has been used to develop the coatings, using as a
donor material MAX-phases on Ti-6Al-4V alloy.
The reasons for choosing this alloy is that it is the most used titanium alloy in the Aerospace
sector. The samples were to be coated using two different kinds of MAX-phase slurries: Ti3SiC2
and Ti2AlC, respectively. The slurry diffusion treatment of the samples was carried out at
different temperatures. Subsequently, samples were oxidized in static air at 600℃ for 300
hours. Characterization of the samples was performed by X-ray diffraction and Scanning
electron Microscopy.
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Keywords
Oxidación, Metales, Aleaciones, Polimerización, Titanio, Ensayo de materiales, Materiales de recubrimiento