Effect of Si additions on the Al2O3 grain refinement upon oxidation of Cr2AlC MAX phase. Issue 4 (April 2017)

• Record Type: Journal Article
• Authors: Shang, Lin; Konda Gokuldoss, Pradeep; Sandlöbes, Stefanie; to Baben, Moritz; Schneider, Jochen M.
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 4(2017)
• Page Start: 1339
• Page End: 1347
• Publication Date: 2017-04
• Subjects: Mn+1AXn phases -- Oxidation -- Alloying -- Atom probe tomography -- Combinatorial magnetron sputtering; 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.2016.11.050
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The effect of Si additions on the oxidation behavior of Cr2 AlC based coatings is investigated. Oxidation experiment was performed at 1120 °C in air for 4 h for Cr2 AlC and Cr2 Al1 − x Si x C (0 < x ≤ 0.06) coatings. The crystal structure, microstructure and chemical composition of the as-deposited as well as oxidized coatings have been investigated. Alloying Cr2 AlC with up to 0.7 at.% Si causes an increase in Al2 O3 scale thickness by up to 40 ± 17%. Electron microscopy and atom probe tomography data support the notion that the here reported Si concentration induced 40% increase in Al2 O3 layer thickness (during oxidation at 1120 °C for 4 h) is enabled by the Si concentration induced, and hence concomitant, increase in nucleation density of Al2 O3 .