Coupled Growth Zone of the Al 2 O 3 -YAG Eutectic System in the Undercooled Melt
Coupled Growth Zone of the Al 2 O 3 -YAG Eutectic System in the Undercooled Melt
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过冷熔体中Al 2 O 3 -YAG共晶体系的耦合生长区
DOI：
10.2320/jinstmet1952.66.1_9
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发表时间：
2002
影响因子：
--
通讯作者：
Y. Waku
中科院分区：
文献类型：
--
作者：
Y. Mizutani;H. Yasuda;I. Ohnaka;N. Maeda;Y. Waku
利用光学差热分析仪研究了成分范围为17.0~20.0 molY2O3的Al2O3YAG共晶体系过冷凝固过程中的耦合生长。共晶界面的生长速率根据凝固时间和试样尺寸进行估计，可能的生长速率为 10-5 至 10-4 m/s。实验条件下共晶间距与生长速率的关系满足l2V=const。成分比共晶成分少或多 1 mol 的样品总是表现出初生 Al2O3 或 YAG 相。相反，具有共晶成分的试样完全被共晶结构覆盖。 Al2O3YAG体系中证实了耦合生长，但耦合生长的成分范围最多为1 mol。生长速率从10-5到10-4 m/s不影响耦合生长区。
Coupled growth in the undercooled solidification of the Al2O3YAG eutectic system was investigated for specimens in a composition range of 17.0 to 20.0 molY2O3 by using an optical DTA apparatus. Growth rate of the eutectic interface was estimated from solidification time and specimen size and the possible growth rate was from 10-5 to 10-4 m/s. The relationship between the eutectic spacing and growth rate obeys l2V=const in the experimental condition. Specimens with compositions of 1 mol less or more than the eutectic composition always exhibited primary Al2O3 or YAG phases. In contrast, the specimens with the eutectic composition were completely covered with the eutectic structure. The coupled growth was confirmed in the Al2O3YAG system, but the composition range of coupled growth was 1 mol at most. The growth rate from 10-5 to 10-4 m/s did not affect the coupled growth zone.