Oxidation behaviour of V2AlC MAX phase coatings. Issue 13 (October 2020)

• Record Type: Journal Article
• Authors: Azina, Clio; Mráz, Stanislav; Greczynski, Grzegorz; Hans, Marcus; Primetzhofer, Daniel; Schneider, Jochen M.; Eklund, Per
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 13(2020)
• Page Start: 4436
• Page End: 4444
• Publication Date: 2020-10
• Subjects: MAX phases -- Coatings -- Oxidation -- V2AlC; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.05.080
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: 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.