The effect of TiO2 additions on CaO-MgO-Al2O3-SiO2 (CMAS) crystallization behavior from the melt

被引：16
作者：
Webster, Rebekah I. [1 ]
Opila, Elizabeth J. [1 ]
机构：
[1] Univ Virginia, Mat Sci & Engn Dept, Charlottesville, VA 22903 USA
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2019年 / 102卷 / 06期
关键词：
THERMAL BARRIER COATINGS; CALCIUM ALUMINOSILICATE PHASE; POWDER DIFFRACTION; GLASS-CERAMICS; EXPANSION; RESISTANCE; VISCOSITY; LIQUIDS; ATTACK; EQUILIBRIA;
D O I：
10.1111/jace.16180
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Titania (TiO2) was introduced into a model calcium-magnesium aluminosilicate (CMAS) glass in additions of 5-20wt%. The crystallization behavior of the mixtures was characterized over a series of temperature profiles and compared to that of CMAS alone. X-ray diffraction, differential scanning calorimetry, light and scanning electron microscopy, and energy dispersive spectroscopy were used to characterize glass and crystalline products. Titania additions in the amount of approximately 12.5-20wt% aided in the formation of CaTiO3 from melts equilibrated at either 1300 or 1500 degrees C and cooled at 10 degrees C/min. Holding CMAS + TiO2 (TiO2 10wt%) at 900 degrees C after cooling from 1300/1500 degrees C resulted in the formation of additional crystalline phases including melilite, paqueite, and diopside. Implications for CMAS interactions with thermal and environmental barrier coatings are discussed.
引用
收藏
页码：3354 / 3367
页数：14
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