期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 30, 期 4, 页码 889-897出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2009.10.005
关键词
Thermal barrier coatings; Nanostructured Al2O3-Y2O3-ZrO2; Grain growth; Porosity; Thermal properties
资金
- National Natural Science Foundation of China
- Aviation Science Foundation [2008ZE51073]
- Program for New Century Excellent Talents in University (NCET)
- Changjiang Scholars and Innovative Research Team in University [IRT0512]
Nanostructured 13 wt%Al2O3-8Wt% Y2O3-ZrO2 (13AlYSZ) coatings were developed by atmospheric plasma spraying (APS). The phase structure and the morphology of the 13AlYSZ coatings were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). It was found that the as-sprayed coatings mainly consisted of tetragonal zirconia, with the Al element solid solution in ZrO2. Heat treatment at 1100 degrees C increased the average grain size of the ZrO2 phase from 61 to 120 nm and decreased the porosity from 23.8 to 18%. The addition of the nano-Al2O3 can effectively inhibit the grain growth of the zirconia phase. The mechanism on inhibiting the grain growth of nanostructured 8 wt% Y2O3-ZrO2 thermal barrier coatings has been discussed in detail. (C) 2009 Elsevier Ltd. All rights reserved.
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