Мақола

Oxidation behaviour of V2AlC MAX phase coatings

Clio AzinaMaterials Chemistry, RWTH Aachen University, Kope. 10, D-52074, Aachen, GermanyStanislav MrázMaterials Chemistry, RWTH Aachen University, Kope. 10, D-52074, Aachen, GermanyGrzegorz GreczyńskiThin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183 Linköping, SwedenMarcus HansMaterials Chemistry, RWTH Aachen University, Kope. 10, D-52074, Aachen, GermanyDaniel PrimetzhoferDepartment of Physics and Astronomy, Uppsala University, Lägerhyddsvägen 1, S-75120, Uppsala, SwedenJochen M. SchneiderMaterials Chemistry, RWTH Aachen University, Kope. 10, D-52074, Aachen, GermanyPer EklundThin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183 Linköping, Sweden

2020en

ABI

Аннотация

We report on the oxidation behaviour of V2AlC coatings up to 800 °C, in air. The coatings were deposited at 580 °C using magnetron sputtering from a powder metallurgical composite V2AlC target and were subsequently oxidised for 5, 15 and 30 min. The microstructural evolution of the samples was investigated, and X-ray diffraction patterns were collected to track the formation of oxides. The first indications of oxidation appear after just 15 min at 500 °C, as V-based oxides grew on the surface of the coatings. Later, the presence of mostly V-based oxides and ternary (V, Al)-oxides was observed starting after 5 min at 600 °C. Further analyses confirmed outward diffusion of V and inward diffusion of O, while Al tends to sublimate. α-Al2O3 was only indexed after 5 min at 800 °C. Ex-situ electrical resistivity measurements allowed tracking the oxidation progress of the V2AlC coating.

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Идентификаторлар

DOI: 10.1016/j.jeurceramsoc.2020.05.080

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