Undercooled Melt Formation and Shaping of Alumina-Yttrium Aluminum Garnet Eutectic Ceramics

Undercooled melt was produced in the alumina‐rich portion of the Al2O3–Y2O3 system, heating the metastable eutectic structure to above the metastable eutectic temperature but below the equilibrium eutectic temperature, followed immediately by solidification along the equilibrium path in the undercoo...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2003-10, Vol.86 (10), p.1818-1820
Main Authors: Yasuda, Hideyuki, Mizutani, Yoshiki, Ohnaka, Itsuo, Sugiyama, Akira, Morikawa, Takashi, Waku, Yoshiharu
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
composites
Exact sciences and technology
garnets
melts
oxides
Structural ceramics
Technical ceramics
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Summary:Undercooled melt was produced in the alumina‐rich portion of the Al2O3–Y2O3 system, heating the metastable eutectic structure to above the metastable eutectic temperature but below the equilibrium eutectic temperature, followed immediately by solidification along the equilibrium path in the undercooled melt. Coupling the melting and solidification enabled a nearly adiabatic transformation from the metastable eutectic structure to the equilibrium eutectic structure. The eutectic structure produced through the solidification was uniform and fine throughout the castings. A fin‐type casting with a thickness of 300 μm was successfully produced. This paper proposes a novel casting process using the undercooled melt formation.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2003.tb03565.x