# US 2010/0166548 A1 · Steam turbine blade and method for manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0166548 A1 - Document ID: US20100166548A1 - Status: Published application - Kind: A1 - Application number: 12/640,577 - Filed: 2009-12-17 - Published: 2010-07-01 - Earliest claimed: 2008-12-26 - Assignees: Kabushiki Kaisha Toshiba - Inventors: Akio SAYANO; Masashi Takahashi; Masahiro Saito; Kazuyoshi Nakajima; Jianshun Huang; Kazuhiko Mori - Web page: https://patentgrep.com/patent/US20100166548A1 ## CPC - F01D 5/284: {Selection of ceramic materials} - C23C 24/00: Coating starting from inorganic powder (spraying of the coating material in molten state C23C4/00; solid state diffusion C23C8/00 - C23C12/00) - C23C 24/08: by application of heat or pressure and heat (C23C24/04 takes precedence) - F01D 5/288: {Protective coatings for blades} - F05D 2230/90: Coating; Surface treatment - F05D 2300/211: Silica - F05D 2300/2112: Aluminium oxides - F05D 2300/2118: Zirconium oxides - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A steam turbine blade includes a coating film formed at least a portion of a surface of the steam turbine blade, the coating film containing a ceramic matrix and nanosheet particles dispersed in the ceramic matrix. The steam turbine blade is employed as one of stator blades or one of rotor blades in a steam turbine. The steam turbine includes a turbine rotor, the rotor blades implanted in the turbine rotor, the stator blades provided in an upstream side of the corresponding rotor blades, and a turbine casing supporting the stator blades and accommodating turbine rotor, the rotor blades and the stator blades. The steam turbine is also configured such that the rotor blades are paired with the corresponding stator blades to form turbine stages arranged in an axial direction of the turbine rotor, thereby forming steam paths. ## Claims ### Claim 1 A steam turbine blade, comprising: a coating film formed at least a portion of a surface of the steam turbine blade, the coating film containing a ceramic matrix and nanosheet particles dispersed in the ceramic matrix, wherein the steam turbine blade is employed as one of stator blades or one of rotor blades in a steam turbine, the steam turbine including a turbine rotor, the rotor blades implanted in the turbine rotor, the stator blades provided in an upstream side of the corresponding rotor blades, and a turbine casing supporting the stator blades and accommodating the turbine rotor, the rotor blades and the stator blades, the steam turbine being configured such that the rotor blades are paired with the corresponding stator blades to form turbine stages arranged in an axial direction of the turbine rotor, thereby forming steam paths. ### Claim 2 (depends on 1) The steam turbine blade as set forth in claim 1, wherein a content of the ceramic nanosheet particles is set within a range of 1 to 90 vol % for all of the coating film. ### Claim 3 (depends on 1) The steam turbine blade as set forth in claim 1, wherein the ceramic nanosheet particles are made from silicon oxide or titanium oxide. ### Claim 4 (depends on 1) The steam turbine blade as set forth in claim 1, wherein a thickness of each of the ceramic nanosheet particles is set within a range of 0.5 to 10 nm and a lateral size of each of the ceramic nanosheet particles is set within a range of 0.1 to 10 μm. ### Claim 5 (depends on 1) The steam turbine blade as set forth in claim 1, wherein the nanosheet particles have respective minute structures which are stacked and oriented. ### Claim 6 (depends on 1) The steam turbine blade as set forth in claim 1, wherein the ceramic matrix is made from zirconium oxide, titanium oxide, silicon oxide or aluminum oxide. ### Claim 7 (depends on 1) The steam turbine blade as set forth in claim 1, wherein a thickness of the coating film is set within a range of 0.01 to 10 μm. ### Claim 8 A method for manufacturing a steam turbine blade to be employed as one of stator blades or one of rotor blades in a steam turbine, the steam turbine including a turbine rotor, the rotor blades implanted in the turbine rotor, the stator blades provided in an upstream side of the corresponding rotor blades, and a turbine casing supporting the stator blades and accommodating the turbine rotor, the rotor blades and the stator blades, the steam turbine being configured such that the rotor blades are paired with the corresponding stator blades to form turbine stages arranged in an axial direction of the turbine rotor, thereby forming steam paths, comprising: coating a solution containing a ceramic precursor to be a ceramic matrix and nanosheet particles at a surface of the steam turbine blade; and heating the solution coated thereat to form a coating film containing the ceramic matrix and the nanosheet particles dispersed in the ceramic matrix. ### Claim 9 (depends on 8) The method as set forth in claim 8, wherein the ceramic precursor is a precursor made from zirconium oxide, titanium oxide, silicon oxide or aluminum oxide. ### Claim 10 (depends on 8) The method as set forth in claim 8, wherein a temperature when heating the solution coated to form the coating film is set within a range of 80 to 600° C.