The hard diamond condition carbon film fit well is formed the manner

摘要

PURPOSE:To improve the adhesin of a hard diamondlike carbon film to a metallic base material without deforming or deteriorating the base material by forming a layer of Co, Cr, Ni or an alloy of them on the surface of the base material and forming the carbon film on the layer by CVD. CONSTITUTION:An underlayer of one or more among Co, Cr and Ni or an alloy of them is formed on the surface of a metallic base material to about 10nm-100mum thickness. A hard diamondlike carbon film is formed on the underlayer by CVD, preferably high frequency plasma CVD with a gaseous hydrocarbon/hydrogen mixture. Thus, the diamondlike carbon film can be formed on the surface of the metallic base material with satisfactory adhesion. By this surface treatment, superior wear and corrosion resistances and decorativeness can be provided to the metal.