کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1548460 | 997740 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and growth kinetics of Ce and Y jointly modified silicide coatings for Nb-Ti-Si based ultrahigh temperature alloyMicrostructure and growth kinetics of Ce and Y jointly modified silicide coatings for Nb-Ti-Si based ultrahigh temperature allo
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Microstructure and growth kinetics of Ce and Y jointly modified silicide coatings for Nb-Ti-Si based ultrahigh temperature alloyMicrostructure and growth kinetics of Ce and Y jointly modified silicide coatings for Nb-Ti-Si based ultrahigh temperature allo Microstructure and growth kinetics of Ce and Y jointly modified silicide coatings for Nb-Ti-Si based ultrahigh temperature alloyMicrostructure and growth kinetics of Ce and Y jointly modified silicide coatings for Nb-Ti-Si based ultrahigh temperature allo](/preview/png/1548460.png)
چکیده انگلیسی
In order to protect Nbî¸Tiî¸Si based ultrahigh temperature alloy from oxidation, pack cementation processes were utilized to prepare Ce and Y jointly modified silicide coatings. The Ce and Y jointly modified silicide coating has a double-layer structure: a relatively thick (Nb, X)Si2 (X represents Ti, Cr and Hf elements) outer layer and a thin (Ti, Nb)5Si4 transitional layer. The pack cementation experiments at 1150 °C for 8 h proved that the addition of certain amounts of CeO2 and Y2O3 powders in the packs distinctly influenced the coating thickness, the contents of Si, Ce and Y in the (Nb, X)Si2 outer layers, and the density of cavities in the coatings. In order to study the effects of Ce and Y joint modification in the silicide coatings, both only Ce and only Y modified silicide coatings were also prepared for comparison. The mechanisms of the beneficial effects of Ce and Y are discussed. A pack mixture containing 1.5CeO2-0.75Y2O3 (wt%) powders was employed to investigate the growth kinetics of the Ce and Y jointly modified silicide coating at 1050, 1150 and 1250 °C. It has been found that the growth kinetics obeyed parabolic laws and the parabolic rate constants were 109.20 μm2/h at 1050 °C, 366.75 μm2/h at 1150 °C and 569.78 μm2/h at 1250 °C, and the activation energy for the growth of the Ce and Y jointly modified silicide coating was 197.53 kJ/mol.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Natural Science: Materials International - Volume 23, Issue 2, April 2013, Pages 190-197
Journal: Progress in Natural Science: Materials International - Volume 23, Issue 2, April 2013, Pages 190-197
نویسندگان
Yingtian Liu, Xiping Guo,