To provide a shroud for a gas turbine, having excellent heat and abrasion resistances in a high temperature region.
A shroud 9a is made of a monolithic ceramics such as a silicon nitride, a silicon carbide, and an alumina, or a ceramics fiber reinforced ceramics composite material, or a ceramics such as a ceramics reinforced metal matrix composite material, or a composite material containing a ceramics. The shroud 9a has excellent abrasion, heat and oxidation resistances. It is sufficient that only a portion of the shroud 9a is made of the ceramics, and it is especially desirable that an end of the shroud 9a on the side of a rotor blade 3 is made of a ceramics. A ceramics or a composite material containing a ceramics used herein includes, according to an intended purpose, for example, a ceramic matrix composite material composed to a ceramic matrix such as a silicon nitride, a silicon carbide, and an alumina, with a reinforcing agent of a ceramic fiber such as a carbon fiber and a silicon carbide fiber. The ceramic matrix composite material is configured to have the Vickers hardness not less than 1,000.
SASAKI KEN
NAGAHISA TAKAYA
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