کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
694026 1460535 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase transformation and oxidation behavior of Pt-modified MCrAlY coatings
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Phase transformation and oxidation behavior of Pt-modified MCrAlY coatings
چکیده انگلیسی

The effects of platinum (Pt) layer on phase transformation and oxidation behavior of MCrAlY (M = Co, Ni) coatings were investigated by isothermal and cyclic oxidation tests at temperature of 1100 °C. Pt layer of about 5 μm thickness was deposited on MAR M247-DS superalloy by an electroplating method, and then the MCrAlY layers were coated with air plasma spray (APS) and vacuum plasma spray (VPS) methods. APS process creates internal oxides and interface voids, whereas the VPS process shows fewer voids in the interface between the MCrAlY layer and the superalloy used as substrate. The oxides and voids formed in the APS process deteriorate the oxidation resistance, indicating that the oxides and voids are transferred to Al2O3 compounds during the oxidation tests. The Pt layer shows a strong affinity with Ni element and a weak affinity with Co and Cr elements, resulting in the formation of β-(Ni,Pt)Al phase. The Pt pre-coated layer forces down for the diffusion of soluble elements to get the reduced deplete zone in the superalloy. The VPS process enhances the oxidation resistance of the MCrAlY coating and shows better bonding strength, owing to the generation of homogenous microstructure in the coating and less processing defects.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Organic Coatings - Volume 61, Issues 2–4, February 2008, Pages 316–320
نویسندگان
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