Microstructure and High Temperature Strength Characteristics of Unidirectionally Solidified Al2 O3 /GdAlO3 Eutectic Composite

Hideki Ohtsubo; Narihito Nakagawa; Kazutoshi Shimizu; Koji Shibata; Atsuyuki Mitani; Yoshiharu Waku

doi:10.4028/www.scientific.net/KEM.317-318.437

Paper Titles

Oxynitride Glasses and Their Properties - Implications for High Temperature Performance of Silicon Nitride-Based Ceramics
p.419

High-Temperature Properties of Silicon Nitride with Lu-Si-O-N Grain Boundary Phases
p.425

Analysis of Internal Friction on Silicon Nitride with Visco-Elastic Model
p.429

Deformation Behavior of SiO₂ Doped Nanocrystalline Monoclinic Zirconia at Low Temperatures
p.433

Microstructure and High Temperature Strength Characteristics of Unidirectionally Solidified Al₂ O₃ /GdAlO₃ Eutectic Composite
p.437

Influence of Grain Boundary Properties on Microcracking of AlN in Sliding Test
p.441

The Effect of Particle Migration on the Creep-Rate of Nanocomposites
p.445

Crack Propagation Behavior of Alumina with Different Grain Sizes under Static and Cyclic Fatigue
p.449

Crack-Healing under Cyclic Stress and Improvement of the Resultant Fatigue Strength of Si₃N₄/SiC
p.453

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Microstructure and High Temperature Strength Characteristics of Unidirectionally Solidified Al₂ O₃ /GdAlO₃ Eutectic Composite

Abstract:

Enploying unidirectional solidification, Al2O3/GdAlO3(Gadolinium Aluminum Perovskite:GAP) eutectic composite was fabricated. The Al2O3/GAP eutectic composite obtained has a flexural strength of over 600Mpa above 1500C. The composite also showed plastic deformation above 1550C on the flexural test. The effect of microstructure on mechanical strength at high temperature was investigated. Al2O3/GAP eutectic composites having different microstructure were fabricated by controlling the temperature gradient on unidirectional solidification. It was found that the flexural strength at high temperature of the composite became higher with refining the microstructure.