کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8030001 | 1517654 | 2013 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and oxidation behavior of Al and Hf co-deposition coatings on nickel-based superalloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
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چکیده انگلیسی
This study focuses on investigating the microstructure and oxidation behavior of Al and Hf co-deposition diffusion coatings deposited by Pt electroplating followed by combined aluminizing and hafnizing using the pack cementation technique. The composition (in wt.%) of the packs was 2NiAl-2NH4Cl-xHf-(96 â x)Al2O3 with different Hf levels (x = 2, 6, 12 and 16), and the corresponding microstructure of the coatings was γ-Ni + γâ²-Ni3Al, NiAl + Al16Hf6Ni7, Al16Hf6Ni7 and Al1.65HfNi0.35, respectively. In the post heat-treatment process, with Hf and Al diffusing towards the superalloy substrate and Ni diffusing in the opposite direction, Al16Hf6Ni7 and Al1.65HfNi0.35 were transformed into Ni3Al + Al3HfNi12 and NiAl + Al3HfNi12, respectively. The isothermal oxidation tests at 1000 °C in air indicated that the coating formed in the packs containing 2 wt.% Hf had the lowest weight gain, while the weight gain of the coating formed in the packs having 6 wt.% Hf was the largest. The mechanisms of Hf-rich phase formation and their effects on oxidation resistance of the coatings were discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 224, 15 June 2013, Pages 57-61
Journal: Surface and Coatings Technology - Volume 224, 15 June 2013, Pages 57-61
نویسندگان
G.H. Cao, P.P. Yao, C. Fu, A.M. Russell,