| 摘要 |
PURPOSE:To make it possible to carry out high-precision mold processing readily, by processing a mold material of tungsten carbide type super hard alloy into pressing molds and forming coating films having uniform thickness and comprising a compound with a specific composition consisting of indium, rhenium and carbon on the molds. CONSTITUTION:Molds for direct press molding for optical glass are obtained by using a supper hard alloy such as WC-Co comprising WC as a main component as a preform, processing the super hard alloy into pressing molds of lens shape to be molded and further forming films with uniform thickness on the molds. The film comprises a compound consisting of 10-70wt% Ir, 10-70wt% Re and 20-50wt% C as main components and is formed on the specular face of the preform by sputtering method. The molds have no reaction with glass, excellent releasability between the molds and glass and hardly produces flaws on the surface of the molds. |
