In situ observation of NaBi(WO4)2 dendrite growth and the study on microstructure of solidification

被引：1
作者：
Ai, Fei [1 ]
Hong, Yong [1 ]
Jin, WeiQing [1 ]
Luo, HaoSu [1 ]
Liu, Yan [1 ]
Pan, XiuHong [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
来源：
SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY | 2007年 / 50卷 / 04期
基金：
中国国家自然科学基金;
关键词：
oxide; dendrite; in-situ observation; solidification structure;
D O I：
10.1007/s11433-007-0050-x
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The dendrite growth process of transparent NaBi(WO4)(2) with small prandtl and high melting point was studied by using the in-situ observation system. According to the dynamic images and detailed information, there are two kinds of restriction effect on the dendrite growth, the competition between arms and branches and the convection in the melt. The dendrite growth rate was time dependent, and the rate of arm growth reached the maximum 5.8 mm/s in the diffusive-advective region and rapidly decreased in the diffusive-convective region. The growth rate of branch had the same change trends as the arm's. Based on the EPMA-EDS data of solidification structure of quenched NaBi(WO4)(2) melt, it was found that there were component differences from stoichiometric concentration in the melt near the interface during the growth process.
引用
收藏
页码：525 / 530
页数：6
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