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首页> 外文期刊>Science and Technology of Advanced Materials >Solidification and shape casting of Al_2O_3-YAG eutectic ceramics from the undercooled melt produced by melting Al_2O_3-YAP eutectics
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Solidification and shape casting of Al_2O_3-YAG eutectic ceramics from the undercooled melt produced by melting Al_2O_3-YAP eutectics

机译：由Al_2O_3-YAP共晶熔化产生的过冷熔体凝固Al_2O_3-YAG共晶陶瓷。

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摘要

There are two eutectic systems in the Al_2O_3-rich portion of the Al_2O_3-Y_2O_3 system: one is the Al_2O_3-YAG equilibrium eutectic system and the other is the Al_2O_3-YAP metastable eutectic system. Heating the Al_2O_3-YAP metastable eutectic structure up to temperatures above the metastable eutectic temperature but below the equilibrium eutectic temperature produced the undercooled melt. Solidification in the equilibrium path immediately followed the undercooled melt formation. The solidification in the equilibrium path along with the melting of the metastable eutectic structure resulted in a fine and uniform equilibrium eutectic structure with lamellar spacing of less than 1 μm. The equilibrium eutectic structure was not affected by the metastable eutectic structure used for the undercooled melt formation. Shape casting and joining of alumina rods were demonstrated using the undercooled melt produced by the melting of the Al_2O_3-YAP metastable eutectic structure. The fine eutectic structure was obtained throughout the castings. Coupling of the solidification and the melting achieved a higher growth rate than conventional solidification from the undercooled melt. The skewed coupled growth zone due to the kinetic effect contributed to formation of the fine eutectic structure at the metastable eutectic composition.
机译：在Al_2O_3-Y_2O_3系统的富含Al_2O_3-的部分中有两个共晶系统：一个是Al_2O_3-YAG平衡共晶系统，另一个是Al_2O_3-YAP亚稳共晶系统。将Al_2O_3-YAP亚稳共晶结构加热到高于亚稳共晶温度但低于平衡共晶温度的温度会产生过冷熔体。平衡路径中的凝固紧随过冷熔体形成之后。平衡路径中的凝固以及亚稳态共晶结构的熔化导致层状间距小于1μm的精细且均匀的平衡共晶结构。平衡共晶结构不受用于过冷熔体形成的亚稳态共晶结构的影响。通过熔化Al_2O_3-YAP亚稳共晶结构产生的过冷熔体，证明了氧化铝棒的铸造和连接。在整个铸件中获得了良好的共晶组织。凝固和熔化的耦合比来自过冷熔体的常规凝固获得了更高的生长速率。由于动力学效应而导致的偏斜耦合生长区有助于在亚稳态共晶成分处形成精细的共晶结构。

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