Patent EP0508731A2 successfully refreshed from Google Patents.
EP0508731A2
Expired / Lapsed
EP
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Use of an oxide coating to enhance the resistance to oxidation and corrosion of a silicon nitride based gas turbine blade
Assignee: NGK Insulators Ltd
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Filing: 1992-04-08
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Granted: —
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Expires: 2012-04-08
Abstract
Abstract A gas turbine blade improved in terms of resistance to oxidation and corrosion is provided. A coat of an oxide excelling in high-temperature strength and heat resistance is formed onto the surface of a silicon nitride sintered part forming a gas turbine blade body. At least one oxide selected from the group consisting of alumina, mullite, zirconia, yttria and zircon is used as the oxide. The oxide coat is formed on the surface of the silicon nitride-based sintered part in the form of a thin film by plasma spray coating.
Inventors
- 👤 Yutaka C/O The Tokyo Elec. Power Co. Inc. Furuse
- 👤 Yasuyuki c/o The Tokyo Elec. Power Co. Inc. Endo
- 👤 Hiromichi Kobayashi
- 👤 Hiroaki Sakai
- 👤 Hiroyuki Ohi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:03
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/288
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A gas turbine blade comprising an oxide thin film coated on the surface of a blade body formed of a silicon nitride-based sintered part.
Claim 2
Dependent Claim
27 words
A gas turbine blade as claimed in claim 1, wherein at least one oxide selected from alumina, mullite, zirconia, yttria and zircon is used as said oxide.
Claim 3
Dependent Claim
32 words
A gas turbine blade of claim 1 or 2 wherein said oxide is coated onto the surface of said blade body in the form of a thin film by plasma spray coating.
Claim 4
Independent Claim
24 words
A method of making a gas turbine blade comprising forming an oxide thin film on the surface of a silicon nitride-based sintered blade body.
Claim 5
Dependent Claim
80 words
A method according to claim 4 comprising the steps of: treating mechanically, thermally or chemically the surface of a silicon nitride-based sintered part, to a surface roughness of at least 1.5µm or more as expressed in terms of ten-point average roughness (Rz), or a surface roughness of at least 0.2µm or more as expressed in terms of centre-line average roughness (Ra), and plasma-spraying at least one of alumina, mullite, zirconia, yttria and zircon onto the surface of said sintered part.
References Cited (Backward Citations)
No citation records indexed.
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