In situ Raman spectroscopy studies of high-temperature degradation of thermal barrier coatings by molten silicate deposits

被引：61
作者：
Garces, Hector F. [1 ]
Senturk, Bilge S. [1 ]
Padture, Nitin P. [1 ]
机构：
[1] Brown Univ, Sch Engn, Providence, RI 02912 USA
来源：
SCRIPTA MATERIALIA | 2014年 / 76卷
关键词：
Thermal barrier coatings; Raman spectroscopy; Zirconia; CMAS; GLASSY DEPOSITS; RESISTANT; ATTACK; DAMAGE; ASH; DELAMINATION; MITIGATION; ENGINES;
D O I：
10.1016/j.scriptamat.2013.12.008
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In situ Raman spectroscopy is used to understand the high-temperature interactions between air-plasma-sprayed 7 wt.% Y2O3-stabilized ZrO2 (7YSZ) thermal barrier coatings (TBCs) and calcium-magnesium-alumino-silicate (CMAS) sand. These interactions result in the depletion of Y3+ in the YSZ grains. During cooling the Y-depleted YSZ grains transform to the monoclinic phase starting at similar to 600 degrees C. The significant volume expansion associated with this phase transformation could play a role in determining the thermomechanical failure of CMAS-penetrated 7YSZ TBCs during thermal cycling. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：29 / 32
页数：4
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