COMBUSTION ENGINE, GAS TURBINE, AND POLISHING LAYER

Title:

COMBUSTION ENGINE, GAS TURBINE, AND POLISHING LAYER

Document Type and Number:

WIPO Patent Application WO/2002/068799

Kind Code:

A1

Abstract:

A gas turbine capable of maintaining a proper clearance between a rotor blade and a shroud for long period from the start of an operation to make hard the rotor blade to be damaged, wherein the rotor blade is opposed to the shroud in a turbine part, a polishing layer is formed at the tip of the rotor blade, a heat shielding layer is formed on the inner peripheral surface of the shroud, the polishing layer is formed of a matrix and a large number of abrasive particles distributed in the matrix, the abrasive particles contain projected particles projected from the matrix and buried particles buried in the matrix, and the inner peripheral surface of the shroud is polished by the projected particles in the initial sliding between the rotor blade and the shroud at the initial stage of the operation and, after the projected particles are dissipated, the inner peripheral surface of the shroud is polished by the buried particles.

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Inventors:

OHARA MINORU (JP)
MEGA MASAHIKO (JP)

Application Number:

PCT/JP2002/001788

Publication Date:

September 06, 2002

Filing Date:

February 27, 2002

Export Citation:

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Assignee:

MITSUBISHI HEAVY IND LTD (JP)
OHARA MINORU (JP)
MEGA MASAHIKO (JP)

International Classes:

C25D15/02; F01D5/20; F01D11/08; F01D11/12; F02C7/28; (IPC1-7): F01D5/20; F02C7/28

Domestic Patent References:

WO1994019583A1

1994-09-01

Foreign References:

EP0484115A1	1992-05-06
US4735656A	1988-04-05
JP2002105666A	2002-04-10

Other References: