کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8023767 1517539 2018 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improved mechanical properties, thermal stabilities, and oxidation resistance of arc evaporated Ti-Al-N coatings through alloying with Ta
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Improved mechanical properties, thermal stabilities, and oxidation resistance of arc evaporated Ti-Al-N coatings through alloying with Ta
چکیده انگلیسی
Ti-Al-N is widely used as protective coating in various industrial applications. Here, we investigate the influence of Ta content - ranging from 0 to 28 at.% on the metal sublattice - on the mechanical properties, thermal stability, and high temperature oxidation resistance of arc evaporated Ti-Al-N coatings. We found an increase in hardness from 30.0 ± 1.0 GPa for Ti0.54Al0.46N to 35 ± 0.7 GPa for Ti0.44Al0.41Ta0.15N. Furthermore, age hardening due to spinodal decomposition of the supersaturated solid solution into cubic AlN-, TiN-, and TaN-rich domains lead to maximum hardness values of 39.5 ± 1.0 GPa upon annealing to 1100 °C for Ti0.38Al0.34Ta0.28N. This behaviour is directly linked with the extremely retarded formation of wurtzite structured (w) AlN. Even after annealing Ti0.38Al0.34Ta0.28N at the maximum temperature of 1100 °C, no crystalline w-AlN phase could be detected. Additionally, the incorporation of Ta to Ti-Al-N leads to a significantly higher oxidation resistance. While Ti0.54Al0.46N is already fully oxidised during exposure to ambient air at 900 °C, following a linear like oxide scale growth kinetic with 2.96 ± 0.48 μm/h, the Ti0.49Al0.44Ta0.07N and Ti0.44Al0.41Ta0.15N coatings provide the lowest parabolic-like oxide growth rates of 7.1 ± 0.4·10−2 μm2/h. The even higher-Ta-containing Ti0.38Al0.34Ta0.28N exhibits already a much higher oxide scale growth rate of 23.1 ± 1.7·10−2 μm2/h. Consequently, the Ta content for an optimised oxidation resistance needs to be balanced to the Ti content of the Ti-Al-N coatings.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 344, 25 June 2018, Pages 244-249
نویسندگان
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