Method of providing a metal component with a thermally black surface
AssigneeU.S. Philips Corporation
InventorJacob Blanken
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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.
Claims12
A method of providing a thermally black surface on a substrate comprising the steps of:
- forming a layer of a metal compound on said substrate, said metal compound comprising aluminum and at least one of molybdenum, nickel, iron, tungsten and copper;
- and
- oxidizing part of the aluminum from said metal compound.
A thermally black material capable of withstanding temperatures of at least 1000.degree. C. comprising a metal compound of aluminum and at least one of molybdenum, nickel, iron, tungsten, and copper, characterized in that the material further comprises aluminum oxide.
A substrate comprising a surface with a thermally black layer, said layer comprising aluminum oxide and at least one of molybdenum, nickel, iron, tungsten, and copper, said thermally black layer produced by the steps of:
- forming a layer of a metal compound on said substrate, said metal compound consisting essentially of aluminum and at least one of molybdenum, nickel, iron, tungsten and copper;
- and
- oxidizing part of the aluminum from said metal compound.
Dependencies are inferred from the claim text.