Shape casting of Al2O3-YAG ceramics by using Undercooled melt

过冷熔体铸造Al2O3-YAG陶瓷

• 批准号: 14350400
• 负责人: OHNAKA Itsuo
• 金额: $ 7.3万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350400/
• 关键词: ceramics; Melt shaping; eutectic reaction; precision casting; microstructure

There are two eutectic systems in the Al_2O_3-rich portion of the AI_2O_3-Y_2O_3 system: one is the A1_2O_3-YAG equilibrium eutectic system and the other is the A1_2O_3-YAP metastable eutectic system. Heating the A1_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 is the A1_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.

在Al_2O_3-Y_2O_3系统的富Al_2O_3部分存在两个共晶系统：一个是Al_2O_3-YAG平衡共晶系统，另一个是Al_2O_3-雅普亚稳共晶系统。将A1_2O_3-雅普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产生过冷熔体。在平衡路径中的凝固紧随着过冷熔体的形成。在平衡路径上凝固沿着亚稳共晶组织的熔化，形成细小均匀的平衡共晶组织，片层间距小于1 μm。平衡共晶组织不受用于过冷熔体形成的亚稳共晶组织的影响。利用Al_2O_3-雅普亚稳共晶组织熔化产生的过冷熔体进行了氧化铝棒的成形铸造和连接。整个铸件获得了细小的共晶组织。耦合的凝固和熔化实现了更高的增长率比传统的凝固从过冷熔体。在亚稳共晶成分下，由于动力学效应而形成的偏斜耦合生长区有助于形成细小的共晶组织。

项目成果

Y.Mizutani, H.Yasuda, I.Ohnaka, A.Sugiyama, S.Takeshima, M.Kirihara, Y.Waku: "Undercooled melt formation by melting of metastable eutectic structure in A12O3-Y2O3-ZrO2 system"Materials Transaction JIM. 43[11]. 847-2854 (2002)

Y.Mizutani、H.Yasuda、I.Ohnaka、A.Sugiyama、S.Takeshima、M.Kirihara、Y.Waku：“A12O3-Y2O3-ZrO2 体系中亚稳态共晶结构熔化形成过冷熔体”Materials Transaction JIM。

H.Yasuda, Y.Mizutani, I.Ohnaka, M.Kirihara, T.Sakimura: "Application of an Optical DTA for Morphological Transition in the A12O3-YAP-ZrO2, Metastable Eutectic System"ISIJ International. 43 [11]. 1733-1741 (2003)

H.Yasuda、Y.Mizutani、I.Ohnaka、M.Kirihara、T.Sakimura：“光学 DTA 在 A12O3-YAP-ZrO2 亚稳态共晶体系中形态转变的应用”ISIJ International。

H.Yasuda: "Solidification and Shape casting of Al2O3-YAG eutectic ceramics from the undercooled melt produced by melting Al2O3-YAP eutectics"Science and Technology of Advanced Materials. 5. 207-217 (2004)

H.Yasuda：“通过熔化Al2O3-YAP共晶产生的过冷熔体进行Al2O3-YAG共晶陶瓷的凝固和成型”《先进材料科学与技术》。

H.Yasuda: "Undercooled melt formation and shaping of Al_2O_3-YAG eutectic ceramics"J.American Ceramics Society. 86/10. 1818-1820 (2003)

H.Yasuda：“Al_2O_3-YAG共晶陶瓷的过冷熔体形成和成型”J.美国陶瓷学会。

H.Yasuda: "Application of an Optical DTA for Morphological Transition in the Al_2O_3-YAP-ZrO_2, Meta stable Eutectic System"ISIJ International. 43/11. 1733-1741 (2003)

H.Yasuda：“光学 DTA 在 Al_2O_3-YAP-ZrO_2 亚稳定共晶体系中形态转变的应用”ISIJ International。