期刊
SURFACE & COATINGS TECHNOLOGY
卷 352, 期 -, 页码 348-353出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2018.08.041
关键词
Thermal shock resistance; Ytterbium disilicate; Ytterbium monosilicate; Environmental barrier coatings; Air plasma spray
资金
- National Science Foundation of China [51502342]
- Research Funding of National University of Defense Technology [ZK17-03-57]
- Hunan Provincial Natural Science Foundation of China [2018JJ1029]
The thermal shock properties of mixed Yb2Si2O7 and Yb2SiO5 composite environmental barrier coating (EBC) topcoat, with various Yb2Si2O7-to-Yb2SiO5 ratios, are investigated between room temperature and 1500 degrees C. The results show that, with more Yb2Si2O7 introduced, the mixed Yb2Si2O7 and Yb2SiO5 composite topcoats exhibit an increasing thermal shock property. This may be attributed to that, while Yb2Si2O7 mole fraction increases, the thermal expansion coefficient of the mixed Yb2Si2O7 and Yb2SiO5 composite ceramics becomes smaller, more matched to substrates and the fracture toughness of the mixed Yb2Si2O7 and Yb2SiO5 composite ceramics becomes larger, both of which are favoring the improvement of thermal shock resistance.
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