期刊
CERAMICS INTERNATIONAL
卷 45, 期 6, 页码 6632-6638出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.12.151
关键词
Directional solidification; Oxide ceramic; Microstructure; Eutectic; Abrupt change pulling rate
资金
- National Key R&D Program of China [2017YFB1103500, 2018YFB1106600]
- National Natural Science Foundation of China [51822405, 51472200, 51272211, 51690163]
- Research Fund of Equipment Development Department [6140759040116HK03001, 61409230402]
- Aeronautical Power Foundation [DL2018067]
- Key R&D Program of ShaanXi Province [2018ZDCXL-GY-09-04]
- Shenzhen Science and Technology Innovation Committee Fund [201803063000257]
Directionally solidified microstructures of Al2O3-Er3Al5O12 eutectic and off-eutectic in situ composite ceramics were explored under abrupt-change pulling rate conditions. Corresponding temperature distributions and interface locations were studied. In eutectic composition, fluctuation of eutectic spacing occurred when the pulling rate increased abruptly. A gradually increase or abrupt increase in eutectic spacing was observed when the pulling rate decreased abruptly. In hypoeutectic and hypereutectic compositions, formation of the primary phases were suppressed when the pulling rate increased abruptly from 10 mu m/s to 100 mu m/s, while primary phases precipitated when the pulling rate decreased abruptly from 100 mu m/s to 10 mu m/s. The interface altitude decreased after the pulling rate increased abruptly, but increased after the pulling rate decreased abruptly. The liquid composition restriction (around the eutectic composition) at the eutectic interface plays an important role in the suppression of the primary dendrite and coupled eutectic oxides can be obtained in off-eutectic compositions even under higher solidification rate conditions.
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