Effect of Si additions on the Al₂O₃ grain refinement upon oxidation of Cr₂AlC MAX phase

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• 作者：Lin Shang^a ; ; Pradeep Konda Gokuldoss^a ; ^{pradeep@mch.rwth-aachen.de} ; ^{kg.prad@mpie.de} ; Stefanie Sandlö ; bes^b ; Moritz to Baben^a ; ^c ; Jochen M. Schneider^a
• 关键词：Mn+1AXn phases ; Oxidation ; Alloying ; Atom probe tomography ; Combinatorial magnetron sputtering
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：37
• 期：4
• 页码：1339-1347
• 全文大小：5817 K
• 卷排序：37

文摘

The effect of Si additions on the oxidation behavior of Cr2AlC based coatings is investigated. Oxidation experiment was performed at 1120&#xA0;°C in air for 4 h for Cr2AlC and Cr2Al1−xSixC (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 Cr2AlC with up to 0.7 at.% Si causes an increase in Al2O3 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 Al2O3 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 Al2O3.