Method of providing a metal component with a thermally black sur

Details Method of providing a metal component with a thermally black sur Method of providing a metal component with a thermally black sur

1981-04-13

1982-12-21

Hoffman, James R.

Metal treatment

Compositions

Heat treating

148 627, 148 63, 148 631, 148 635, 148 315, C23C 1700, B32B 1520, B32B 1518, B32B 1504

Patent

active

043647804

ABSTRACT:
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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