METHOD OF PROVIDING A METAL COMPONENT WITH A THERMALLY BLACK SURFACE

摘要

PHN 9742 -7- 11.07.1980ABSTRACT:"Method of providing a metal component with a thermally black surface".It is possible to make a metal from the group molybdenum,nickel, iron, tungsten and copper or an alloy comprising at least onemetal from this group, thermally black (black for thermal radiation)and very resistent at high temperatures. This can be done by successive-ly coating this metal or the alloy with a layer of aluminium which isfrom one to a few /µm thick, heating the metal or the alloy thus coatedin a non-reactive atmosphere until the aluminium has reacted with themetal or a metal from the alloy, after which the metal or the alloyis fired in wet hydrogen so that the aluminium is partially oxidizedfrom the compound of the aluminium with the metal or the alloy. Inthis manner a thermally black surface which can withstand very hightemperatures is obtained.