期刊
CORROSION SCIENCE
卷 162, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108199
关键词
LaTi2Al9O19 ceramic; Thermodynamic calculation; Wettability; Calcium-magnesium-alumina-silicate (CMAS); Anorthite
资金
- National Natural Science Foundation of China [51671015, 51771007]
- R&D Program in Key Fields of Guangdong Province [2019B010936001]
- National Key Research and Development Program of China [2017YFA0700700]
- National Science and Technology Major project [2017-VI-0012-0084]
The development of thermal barrier coating (TBC) has been limited by the calcium-magnesium-alumina-silicate (CMAS) corrosion. In this work, a promising CMAS-resisted LaTi2Al9O19 (LTA) rich in Ti and Al is proposed. CMAS corrosion behavior of LTA ceramics is investigated at a temperature range of 1200 degrees C- 1300 degrees C. By combining the experimental results and thermodynamics analysis, Ca and Si are arrested effectively by formation of CaAl2Si2O8 layer and (Ca,La-0.7)(Ti,Al)O-3 to prevent CMAS from moving downward. Meanwhile, the contact angle of CMAS on LTA is larger than that of YSZ, contributing to the CMAS resistance.
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