| 摘要 |
A selective absorption film for selectively absorbing solar rays is composed mainly of cobalt oxide. A blue system selective absorption film having high heat resistance at high temperatures is provided by coating one surface of a metal material of iron or copper with cobalt, and treating the cobalt layer in a furnace in an oxidizing atmosphere for a desired time, while supplying water vapor to the furnace which is maintained in an oxidizing atmosphere so as to carry out an oxidation treatment.
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