| 摘要 |
PURPOSE:To improve the extent of antierosiveness, by coating a Cr film on the surface of a turbine blade by means of ion plating, and also coating such a film that is provided with a concentration gradient, where a component varies from Ti to TiN by degrees, on the top in addition. CONSTITUTION:A Cr film 2 is coated on the surface of a steam turbine blade 1 by means of ion plating, on top of which a film 3, where Ti and TiN are mixed in and a concentration gradient of these components is installed, is coated. This film 3 sets the side of the Cr film 2 to a Ti component at the whole quantity, making it into the film that has such a concentration variation as decreasing the Ti component and increasing a TiN component in proportion as going toward the surface, and an outermost layer 4 should be set to TiN at the whole quantity. With this constitution, at a boundary between Cr and TiN, a difference in extremely larger physical properties is eliminated, whereby the turbine blade is made to be hard to be broken impactive external pressure of steam draining, thus antierosivenss is improved.
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