| 摘要 |
The surface of a metal from the group of molybdenum, nickel, iron, tungsten and copper, or an alloy comprising at least one metal from this group, is made thermally black (black for thermal radiation) and very resistant to high temperatures. This is achieved by coating the metal or alloy with a layer of aluminum which is from one to a few mu m thick. The metal or the alloy thus coated is then heated in a nonreactive atmosphere until the aluminum has reacted with the metal or a metal from the alloy. Finally, the coated metal or alloy is fired in wet hydrogen so that the aluminum is partially oxidized from the compound of the aluminum with the metal or the alloy. In this manner a thermally black surface which can withstand very high temperatures is obtained.
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