| 摘要 |
PROBLEM TO BE SOLVED: To apply corrosion protection treatment independently of the shape, material, and attaching position of a structural member, to improve a corrosion protective effect, and to prevent the occurrence of secular change in the characteristic of a titanium oxide semiconductor by forming a plasma sprayed coating, where a pentavalent element such as Nb is added, on the surface of a nuclear reactor internal structural material. SOLUTION: A material, prepared by doping a TiO2 powder (10-40μm grain size) with 0.01-0.2wt.% of pentavalent element such as Nb, is used as a thermal spraying material. This thermal spraying material is thermally sprayed onto a structural material by means of plasma thermal spraying or atmospheric pressure plasma spraying, by which a corrosion protective film is formed. As to the formation of the film, a TiO2 powder (30-70μm grain size), after regulation by a thermal spraying material feeding means, is fed together with carrier gas to a plasma thermal spraying device, formed into plasmic state, and thermally sprayed, or a TiO2 powder (10-40μm grain size) after regulation, is liquefied, formed into misty state by a mist-generating means 6, fed to a plasma thermal spraying device 7, and formed into a plasma stream P to form a titanium oxide semiconductor layer Y on the surface of the structural material X in the air.
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