Solidification of Al2O3–YAG eutectic composites with off-metastable eutectic composition from undercooled melt produced by melting Al2O3–YAP eutectics
Solidification of Al2O3–YAG eutectic composites with off-metastable eutectic composition from undercooled melt produced by melting Al2O3–YAP eutectics
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DOI：
10.1016/j.jeurceramsoc.2012.02.007
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发表时间：
2012-08
影响因子：
5.7
通讯作者：
T. Nagira;H. Yasuda;Takumi Sakimura;Kentaro Yoshida
中科院分区：
文献类型：
--
作者：
T. Nagira;H. Yasuda;Takumi Sakimura;Kentaro Yoshida
有报道称Al2O3-YAG平衡共晶组织的凝固是在Al2O3-YAP亚稳共晶组织熔化后发生的。由于凝固放热被熔化吸热所消耗，得到了细小均匀的共晶组织。然而，Al2O3-YAG共晶结构的组成仅限于亚稳共晶组成。本文通过在直径小于20μm的Al2O3-YAP共晶颗粒中加入al2o3颗粒，制备了具有非亚稳共晶成分的Al2O3-YAG共晶致密体。在18.5 ~ 13.5mol%的Y2O3组分中，形成了致密的Al2O3-YAG共晶致密体，没有任何al2o3偏析。随着al2o3相含量的增加，材料的抗弯强度和断裂韧性基本保持不变。在Al2O3-YAP共晶颗粒中加入al2o3颗粒，使基体相由YAG相转变为al2o3相。
It has been reported that solidification of the Al2O3–YAG equilibrium eutectic structure follows melting of the Al2O3–YAP metastable eutectic structure. Since the exothermic heat due to solidification was consumed by the endothermic heat due to melting, a fine and uniform eutectic structure was obtained. However, the composition of the Al2O3–YAG eutectic structure is restricted to the metastable eutectic composition. In this paper, Al2O3–YAG eutectic compacts with an off-metastable eutectic composition were prepared by the addition of Al2O3particles to Al2O3–YAP eutectic particles with diameters less than 20μm. In compositions ranging from 18.5mol%Y2O3to 13.5mol%Y2O3, dense Al2O3–YAG eutectic compacts were formed without any Al2O3segregation. The flexural strength and the fracture toughness remained almost unchanged with the increase in the Al2O3phase. The addition of Al2O3particles to the Al2O3–YAP eutectic particles enabled the matrix phase to change from the YAG phase to the Al2O3phase.