PURPOSE: To obtain a black surface treated metallic material excellent in physical properties such as flawing resistance by coating the surface of a metallic material such as a steel sheet with a metallic oxide having oxygen content less than that in stoichiometry.
CONSTITUTION: Hoop 1 in which the surface is cleaned is continuously passed in the direction of the arrow A in a vacuum vapor deposition chamber 2. In the vacuum chamber, an evaporating tank 3b charged with a metal 4a having high affinity with O2 and, on its downstream side, an evaporating tank 3b charged with a metal 4b for forming an oxide layer are arranged. Both metals 4a and 4b are heated to evaporate by electron beams from an electron gun 5 or the like to vapor-deposit the metal 4a on the surface of the steel sheet. Next, the oxide of the metal 4b is vapor-deposited by metallic vapor and oxygen ion beams 8, and, by the above metallic oxide and vapor deposited metal 4a, the steel sheet stoichiometrically deficient in O2 so as to be expressed by MxOn (where, at the time of defining the stoichiometric compsn. of the metallic oxide as MxOy, n≤0.8y is regulated) and in which black metallic oxide excellent in flawing resistance is formed into ≥0.5μm thickness is stably and continuously manufactured.
KAWAFUKU JIYUNJI
KATO ATSUSHI
IKEDA TSUGUMOTO
IRIE KOJI
| JPH0277586A | 1990-03-16 | |||
| JPH02217460A | 1990-08-30 |
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