| 摘要 |
PURPOSE:To improve the corrosion resistance and weatherability of a metallic material at a low cost by forming a thermally sprayed layer of ceramics other than glass on the surface of a metallic material and further forming a thermally sprayed layer of glass on the above layer. CONSTITUTION:A protective layer consisting of a ceramic thermally sprayed layer 6 and a thermally sprayed layer 5 composed, e.g. of SiO2-type glass is formed on the surface of a metallic material 4, such as steel material, Al material, and galvanized steel sheet, by plasma-spraying a powder of ceramics other than glass, such as Al2O3, Y2O3-ZrO2, and SiO2-Al2 O3; on the surface of the metallic material 4 to form the ceramic thermally sprayed layer 6 and further forming the thermally sprayed layer 5, e.g., of SiO2-type glass, or, a corrosion protective layer 7 consisting of galvanized film, Al sprayed deposit, or chromate film is interposed between the ceramic thermally sprayed layer 6 in the above protective layer and the metallic material 4 or a thermally sprayed layer 6 composed of ceramics other than glass similar to the above ceramic thermally sprayed layer 6 is formed on the surface of the glass thermally sprayed layer 5 in the above protective layer, or, a resin layer 8 composed of fluororesin, etc., excellent in contamination resistance is formed on the surface of the ceramic thermally sprayed layer 6. Since the metallic material 4 requires no preheating, the surface characteristics of the metallic material 4 can be improved at a low cost. |
