High temperature strength and thermal stability for melt growth composite

Melt growth composites (MGCs) have a microstructure, in which continuous networks of single-crystal Al 2O 3 phases and single-crystal oxide compounds (YAG (Y 3Al 5O 12), GAP (GdAlO 3)) interpenetrate without grain boundaries. Therefore, the MGCs have excellent high-temperature strength characteristi...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2005, Vol.25 (8), p.1251-1257
Main Authors: Nakagawa, Narihito, Ohtsubo, Hideki, Mitani, Atsuyuki, Shimizu, Kazutoshi, Waku, Yoshiharu
Format: Article
Language:English
Subjects:
Al 2O 3
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
GdAlO 3
Materials science
Mechanical properties
Other materials
Physics
Specific materials
Structural ceramics
Technical ceramics
Thermal properties
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Summary:Melt growth composites (MGCs) have a microstructure, in which continuous networks of single-crystal Al 2O 3 phases and single-crystal oxide compounds (YAG (Y 3Al 5O 12), GAP (GdAlO 3)) interpenetrate without grain boundaries. Therefore, the MGCs have excellent high-temperature strength characteristics, creep resistance, superior oxidation resistance and thermal stability in the air atmosphere at very high temperature. To achieve ultra-high thermal efficiency and low NO x emission for gas turbine systems, we produced turbine nozzle vanes that does not require cooling and heat shield panels for combustor liners. The thermal stability and mechanical properties of these parts have been studied. The high-temperature strength characteristics and the thermal stability of components were also no changes after heat treatment for 500 h at 1700 °C in an air atmosphere. The favorable properties of melt growth composite have been discussed for possible application in gas turbine system.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2005.01.030