Calcia-doped yttria-stabilized zirconia for thermal barrier coatings: synthesis and characterization

被引:14
|
作者
Bhattacharya, Anup K. [1 ]
Reinhard, Patrick [1 ]
Steurer, Walter [1 ]
Shklover, Valery [1 ]
机构
[1] ETH, Dept Mat, CH-8093 Zurich, Switzerland
关键词
PHASE-TRANSFORMATION; SYSTEMS; ZRO2;
D O I
10.1007/s10853-011-5524-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Doping with other oxides has been a stabilization method of ZrO2 for thermal barrier coating applications. Such a stabilized system is 7-8 mol% YO1.5-doped zirconia (7YSZ), which has been in use for around 20 years. In this study, calcia (CaO) and yttria (Y2O3) have been used for doping ZrO2 to produce a stable single-phase cubic calcia-doped yttria-stabilized zirconia (CaYSZ). This has been synthesized using wet chemical synthesis as well as by solid-state synthesis. Unlike partially stabilized zirconia where 5 mol% CaO is doped into ZrO2, CaYSZ has been found to be stable up to 1600 A degrees C. Detailed CaYSZ synthesis steps and phase characterization are presented. Wet chemical synthesis resulted in a stable single-phase CaYSZ just after 4 h treatment at 1400 A degrees C, whereas a 36 h annealing at 1600 A degrees C is required for CaYSZ synthesis during solid-state processing. The CaYSZ has been found stable even for 600 h at 1250 A degrees C. Coefficient of thermal expansion and sintering temperature of CaYSZ was found to be 11 x 10(-6) K-1 and 1220 A degrees C, respectively, which are comparable to 7YSZ. An increase in sintering rate with increasing dopant concentration has also been observed.
引用
收藏
页码:5709 / 5714
页数:6
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