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Innovative Manufacturing Process of MGC Components for Ultra-High Efficiency Gas Turbine Systems

[+] Author Affiliations
Yoshiharu Waku

HPGT Research Association, Ube City, Yamaguchi, Japan

Narihito Nakagawa

Ube Industries, Ltd., Ube City, Yamaguchi, Japan

Kenji Kobayashi

Ishikawajima-Harima Heavy Industries, Ltd., Tokyo, Japan

Yasuhiro Kinoshita

Kawasaki Heavy Industries, Ltd., Akashi City, Japan

Shinya Yokoi

HPGT Research Association, Tokyo, Japan

Paper No. GT2004-53266, pp. 361-368; 8 pages
  • ASME Turbo Expo 2004: Power for Land, Sea, and Air
  • Volume 2: Turbo Expo 2004
  • Vienna, Austria, June 14–17, 2004
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4167-7 | eISBN: 0-7918-3739-4
  • Copyright © 2004 by ASME


Much attention has been paid to unidirectionally solidified ceramic composites as candidates for high-temperature structural materials. Eutectic composites, known as Melt Growth Composites (MGCs), have recently been developed. The binary MGCs (Al2 O3 /YAG and Al2 O3 /GAP binary systems) have a novel microstructure, in which continuous networks of single-crystal Al2 O3 phases and single crystal oxide compounds (YAG or GAP) 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 temperatures. Manufacturing processes for the MGCs are being examined under a Japanese national project, scheduled from 2001–2005. To achieve higher thermal efficiency for gas turbine systems, uncooled turbine nozzle vanes have been fabricated on an experimental basis. Novel manufacturing processes for MGC gas turbine components are proposed.

Copyright © 2004 by ASME



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