کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7887368 | 1509789 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructural evolution of plasma spray physical vapor deposited thermal barrier coatings at 1150â¯Â°C studied by impedance spectroscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Plasma spray physical vapor deposition (PS-PVD) is a new promising technology for processing thermal barrier coatings (TBCs). In this study, the microstructural evolution of PS-PVD yttria-stabilized zirconia (YSZ) TBCs at 1150â¯Â°C was investigated by scanning electron microscopy, electron backscattered diffraction, and impedance spectroscopy. Bridging is observed between the secondary columns of the coatings during the first 8â¯h of heat treatment, while sintering necks are observed between the quasi-columns over the heat-treatment interval of 12-20â¯h. As the heat-treatment time increases to 100â¯h, the nanogaps between the secondary columns disappear and a large number of shrinkage pores are observed in the columns, leading to a typical cellular structure. Besides, the average grain size of the YSZ coatings increases from 0.20 (as-deposited) to 0.55â¯Âµm (after 50â¯h of heat treatment). The resistance of the YSZ grains increases while that of the YSZ grain boundaries decreases because of grain coarsening. During the first 4â¯h of heat treatment, the resistance of the thermally grown oxide (TGO) scale increases because of its thickening. However, its resistance decreases during the next 4â¯h of heat treatment mainly because of the change in its composition (from pure alumina to mixed oxides).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 9, 15 June 2018, Pages 10797-10805
Journal: Ceramics International - Volume 44, Issue 9, 15 June 2018, Pages 10797-10805
نویسندگان
Xiaolin Yang, Liangliang Wei, Jimeng Li, Baopeng Zhang, Shixing Wang, Hongbo Guo,