Max-phase slurry coatings for high temperature oxidation protection of ti based alloys

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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.
Oxidación, Metales, Aleaciones, Polimerización, Titanio, Ensayo de materiales, Materiales de recubrimiento
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