| 摘要 |
PURPOSE:To improve antierosion property, by furnishing a hardened layer, which is flame-quenched after thermal spraying the powder composed of Ni, Cr, Fe, Si, and B, at least at the front edge of the top of a turbine blade made of a titanium type alloy. CONSTITUTION:At least at the front edge of the top of a turbine blade 1, which is made of a titanium type alloy and formed by a mechanical process or a precision forging, a powder consisting of 10-25% of Cr, 1-8% of Fe, 1-5% of B, 1-2% of Co, and the remaining % of Ni, of a specific meshes, is thermal sprayed by a plasma spraying, for example, in a thickness more than about 120mum. To increase the density of the sprayed layer, it is preheated at 100-1,200 deg.C for 1-30min by a gas burner or the like to form a hardened layer 2 at the front edge of the blade top. Therefore, the antierosion property of the front edge of the blade top can be improved by forming such a hardened layer 2, and the service life can be extended.
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