کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1662242 | 1517704 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
TEM study on microstructure of thermally grown oxide in EB-PVD thermal barrier coatings
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
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چکیده انگلیسی
The crystalline structure and composition of the thermally grown oxide (TGO) in an electron beam deposited (EB-PVD) thermal barrier coating (TBC) was investigated using transmission electron microscopy. The TBC was composed of a 200-μm Y2O3 (7 wt.%) stabilized ZrO2 (YSZ) top layer and a 100-μm NiCoCrAlY bond coat (BC) layer on a superalloy substrate. For as-deposited samples, a 500-nm mixed oxide zone was formed at the YSZ/BC interface, which was composed of a fine-grained α-Al2O3 matrix and nano-sized t-ZrO2 crystals. After thermal exposure at 1150 °C for 50 h, a 3-μm TGO layer with α-Al2O3 as the dominant component was developed, which consisted of three distinct layers with different crystalline structures and compositions. They were an Al2O3-ZrO2 mixed zone, a well-crystallized α-Al2O3 zone, and a fine-grained α-Al2O3 zone, respectively. Finally, the formation and evolution of TGO was discussed from the viewpoint of rapid inward diffusion of oxygen and slow outward diffusion of metals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 200, Issues 20â21, 22 May 2006, Pages 6130-6136
Journal: Surface and Coatings Technology - Volume 200, Issues 20â21, 22 May 2006, Pages 6130-6136
نویسندگان
Minghui Hu, Shuqi Guo, Toru Tomimatsu, Yuichi Ikuhara, Yutaka Kagawa,