Patent ID: 8668447

Claim:
A steam turbine blade, comprising: a coating film formed on at least a portion of a surface of the steam turbine blade, the steam turbine blade being made of high-chrome steel, the coating film containing: a ceramic matrix made of zirconium oxide; and nanosheet particles made from silicon oxide dispersed in the ceramic matrix, each of the nanosheet particles being oriented orthogonal to a thickness direction of the coating film so as to provide oxygen barrier property, each of the nanosheet particles being within a range of 0.5 to 10 nm in thickness and within a range of 0.1 to 10 μm in lateral size, 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.