Hitachi, Ltd.

Tohoku Electric Power Company, Inc.

Tosiaki Saito

Akira Yoshinari

Katsumi Iijima

Kimio Kano

Tadami Ishida

Ryozo Hashida

Mitsuru Kobayashi

Katsuo Wada

Hideki Tamaki

Hiroyuki Matsuzaki

A heavy-duty gas turbine includes a compressor; a combustion liner; a turbine blade in a single stage or multi-stages; and a turbine nozzle provided in correspondence to the turbine blade. The turbine blade has a dovetail secured to a turbine disk and has an overall length of not less than 180 mm, and it is made of a single-crystal Ni-base alloy whose .gamma. phase is a single crystal. Operating gas temperature is not less than 1400.degree. C., and metal temperature of a first blade is not less than 1000.degree. C. under working stress.

Gas turbine, gas turbine blade used therefor and manufacturing method

A gas-turbine moving blade made of a Ni-base superalloy containing less grain boundary strengthening elements, in which a blade portion is formed of a single crystal and the rest is formed of columnar crystals, and a gas turbine including the moving blade. A thermal efficiency of the gas turbine can be improved to 35% or more, and a thermal efficiency of complex power generation with a steam turbine can be improved to 45% or more.

Blade for gas turbine

Growing community of inventors

Katsuta, Japan

Tosiaki Saito