Rhenium-iridium coating effect of tungsten carbide mold for aspheric glass lens

Abstract

14. Gopal, A. V. and Rao, P. V., "A new chip-thickness model ofr performance assessment of silicon carbide grinding,"

Investigation of the effects of process parameters on the glass-to-mold sticking force during precision glass molding

“…It is not uncommon to have sub-micron tolerances for shape accuracy and surface roughness (R a ) requirements of only a few nanometers [3,4]. Because of these requirements, the molding tools are very expensive and the process is only economically feasible if they can achieve a long mold life.…”

A review on the importance of surface coating of micro/nano-mold in micro/nano-molding processes

“…Nonetheless, a 120 ± 20 nm thick sol-gel ZrO 2 has been coated on ferritic steel AISI 420 mold successfully and is used in glass hot-embossing to fabricate glass lenses [50]. Rhenium-iridium (Re-Ir) coated tungsten (WC) molds are also used for glass hot-embossing, which show a better surface finish on molded glass workpieces compared to the uncoated mold [224]. On the other hand, amorphous carbon, metal, TiO 2 and SiO 2 coated glass workpieces can reduce adhesion by 10% as compared to the uncoated glass during the fabrication of micro patterns [52].…”

Optical design and manufacturing technology for high resolution laser scanning unit

“…9 Especially, periodicity in surface asperities on the optical inserts is critical because long or mid-period shape error (waviness) over beam aperture in horizontal direction causes mottles and local shading across image plane and short period roughness under aperture size degrades beam shape and increases spot size and background noise.…”