کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8023651 | 1517536 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mechanical properties and oxidation resistance of Al-Cr-N/Ti-Al-Ta-N multilayer coatings
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Arc evaporated Al-Cr-N and Ti-Al-N are widely used protective coating materials due to their outstanding properties. While Al-Cr-N is known for its excellent oxidation resistance, Ti-Al-N exhibits interesting thermo-mechanical properties based on age hardening effects accompanying the spinodal decomposition upon annealing. Previous studies showed that the addition of Ta to Ti-Al-N further enhances the mechanical properties and oxidation resistance. In this work, we combine the beneficial properties of both systems (Ti-Al-Ta-N with a Ta content of about 7â¯at.% on the metal sublattice) in nano-scaled multilayer films with different bilayer periods of 15, 24, and 31â¯nm and total film thicknesses of 3 and 20â¯Î¼m, respectively. We found significantly higher hardness values of up to 35â¯Â±â¯2â¯GPa for the Al-Cr-N/Ti-Al-Ta-N multilayer coatings as compared with their monolithically prepared single phase face-centered cubic structured counterparts, Al-Cr-N with 28â¯Â±â¯2â¯GPa and Ti-Al-Ta-N with 32â¯Â±â¯2â¯GPa. All coatings exhibit a single phase face-centred cubic structure in the as-deposited state. Due to the formation of an Al-rich oxide scale, the high temperature oxidation resistance of the multilayer coating is nearly as good as that of Al0.62Cr0.38N, withstanding oxidation at 900â¯Â°C easily for >20â¯h with a parabolic growth rate constant of kpâ¯~â¯0.01â¯Î¼m2/h. Increasing the total film thickness to 20â¯Î¼m increases the measured hardness to up to 42â¯Â±â¯2â¯GPa and at the same time provides additional protection of the coated parts against oxidation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 347, 15 August 2018, Pages 427-433
Journal: Surface and Coatings Technology - Volume 347, 15 August 2018, Pages 427-433
نویسندگان
W.M. Seidl, M. Bartosik, S. Kolozsvári, H. Bolvardi, P.H. Mayrhofer,