Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1994-10-11
1997-05-20
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
416241B, 428623, F02C 618
Patent
active
056303149
ABSTRACT:
The present invention provides ceramic coated heat-resistant elements which suffer no damages even under high heat load conditions and can afford a thermal barrier effect stably for a long period of time and can be used, for example, as buckets and stationary blades of turbines. A method for making the elements is also provided. The ceramic coated heat-resistant element comprises a heat resisting alloy base mainly composed of Ni and/or Co and a heat-resistant coating layer provided on the surface of the base and is characterized in that said heat-resistant coating layer comprises a metal layer of an alloy superior to the base in high-temperature corrosion and oxidation resistance and provided on the base, an Al.sub.2 O.sub.3 ceramic thin film layer provided on the metal layer, a ZrO.sub.2 ceramic coating layer having dense texture provided on the Al.sub.2 O.sub.3 ceramic thin film layer and a ZrO.sub.2 ceramic coating layer having columnar texture provided on the ZrO.sub.2 ceramic coating layer having dense texture and cracks are present only in said ZrO.sub.2 ceramic coating layer having columnar texture in the direction of thickness along the boundary of the columns. A mixed layer composed of a metal superior to the base in high-temperature corrosion and oxidation resistance and a ZrO.sub.2 ceramic may be provided between the base and the metal layer.
REFERENCES:
patent: 3420054 (1969-01-01), Sheldon
patent: 4676994 (1987-06-01), Demaray
patent: 4966820 (1990-10-01), Kojima et al.
patent: 5209645 (1993-05-01), Kojima et al.
Arikawa Hideyuki
Haginoya Mitsuo
Kojima Yoshitaka
Mebata Akira
Sasada Tetsuo
Casaregola Louis J.
Hitachi , Ltd.
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