| 摘要 |
PROBLEM TO BE SOLVED: To provide a solid grain erosion resistant surface treatment film in which solid grain erosion resistance can be remarkably improved, and which is provided with oxidation resistance without reducing the fatigue strength even to a rotary member, and to provide a rotary machine such as a steam turbine and an axial flow compressor obtained by applying the same. SOLUTION: The solid grain erosion resistant surface treatment film comprises a nitrided hard layer formed on a surface of a base material; one or more physical vapor-deposited hard layers formed on the surface of the nitrided hard layer by a physical vapor deposition method. The thickness of the nitrided hard layer is controlled to≥30μm, and also, the total thickness of the physical vapor-deposited hard film is controlled to≥10μm. In this way, the deformation of the base material at the time of the collision with solid grains and the cracking of the film comprising the nitrided hard layer and the physical vapor-deposited hard layers as the upper layers of the base material are prevented, and its solid grain erosion resistance is secured, thus the increase of the service life in the solid grain erosion resistant surface treatment film is made possible, and also, its oxidation resistance and fatigue strength are improved. COPYRIGHT: (C)2006,JPO&NCIPI
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