| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for strengthening a sprayed deposit and a member having a strengthened sprayed deposit. SOLUTION: In sealing pores remaining in a sprayed deposit, a member after formation of sprayed deposit is placed under a low-pressure environment below atmospheric pressure, and the pores in the sprayed deposit are impregnated with a sealant under the low-pressure environment. Before the solidification and drying of the sealant, the member is transferred to an atmospheric-pressure or high-pressure environment to increase the impregnation depth of the sealant and densify the sprayed deposit. Then drying or heat treatment is performed to strengthen the sprayed deposit. Excellent corrosion resistance to molten metal, acid, alkali, or corrosive gas can be provided and consequently the service life of a base material used under the environment of them can be greatly improved. |
