Hot corrosion behavior and wettability of calcium-magnesium-alumina-silicate (CMAS) on LaTi2Al9O19 ceramic

被引：49
|
作者：
Qu, Weiwei [1 ]
Li, Shusuo [1 ]
Chen, Zehao [1 ]
Li, Chun [1 ]
Pei, Yanling [1 ]
Gong, Shengkai [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
来源：
CORROSION SCIENCE | 2020年 / 162卷
基金：
中国国家自然科学基金;
关键词：
LaTi2Al9O19; ceramic; Thermodynamic calculation; Wettability; Calcium-magnesium-alumina-silicate (CMAS); Anorthite; THERMAL BARRIER COATINGS; Y2O3-STABILIZED ZRO2; RESISTANT; MECHANISMS; AL2O3;
D O I：
10.1016/j.corsci.2019.108199
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：11
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