OXIDATION-PROOF OSMIUM FILM

摘要

PURPOSE:To prevent any oxidation and evaporation of osmium by coating an osmium film with a layer of a base metal such as tungsten. CONSTITUTION:A tungsten plate is coated with an osmium film with about 0.5mum thickness. Osmium is a high-melting-point metal and therefore the above osmium film is formed by electron-ray vapordeposition. After the thus formed body is thermally treated in a nonoxidative atmosphere at about 1,100 deg.C for about 2hr, osmium does not evaporate from the film even when it is oxidized in the atmosphere.