CARBON LAYER COATING METHOD

摘要

A shaped element of germanium or silicon is coated with a layer of hard infra red transparent carbon. The carbon is deposited on the element, used as a cathode, in a glow discharge charge chamber by applying a D.C. voltage to a hydrocarbon gas at a pressure of e.g. 10-1 to 10-2 Torr. Prior to depositing the carbon the element may be heated and cleaned using argon ion bombardment. Layers of germanium and silicon may also be deposited using the gases germane and silane respectively.