期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 3, 页码 1984-1994出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.10.056
关键词
Yttria-stabilized zirconia; Molten silicate attack; CMAS; Diffusion; Dissolution
资金
- Office of Naval Research [N00014-19-1-2377]
- NSF
- MRSEC NSF [DMR 1720256]
This study investigates the dissolution of YSZ into two model silicate melts at different temperatures, providing insights into the dissolution mechanism and its impact on the diffusion rates of Zr4+ and Y3+ in the melts.
The degradation of thermal barrier coatings (TBCs) by molten silicates (CMAS) represents a fundamental barrier to progress in gas turbine technology, requiring a mechanistic understanding of the problem to guide the development of improved coatings. This article investigates the dissolution of yttria-stabilized zirconia (7YSZ and 20YSZ) into two model silicate melts at 1300-1400 degrees C. The approach involves the 1D dissolution of YSZ into a semi-infinite melt, characterizing the dissolution rates of YSZ and the diffusion rates of Zr4+ and Y3+ therein. The assessed kinetics of YSZ dissolution and diffusion were then applied to modeling the same phenomena on TBCrelevant length scales. These findings provide fundamental insight into (i) the dissolution mechanism of YSZ, (ii) the subsequent reprecipitation upon saturation, (iii) the quantitative effects of temperature and melt composition on the dissolution and diffusion kinetics, and (iv) how the measured kinetics manifests on the scale of flow channels present in TBCs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据