Mold protective coatings for precision glass molding
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2022-10-04 |
| Authors | Marcel Friedrichs, Tim Grunwald, Thomas Bergs |
| Institutions | Fraunhofer Institute for Production Technology IPT |
| Citations | 1 |
Abstract
Section titled āAbstractāPrecision Glass Molding (PGM) is a replicative technology to manufacture glass lenses with complex geometries such as aspheres, freeform-optics or lens arrays. During the PGM process, a glass preform is heated until the viscous state and afterwards pressed into the desired shape using two high-precise molds. This process enables the direct and efficient manufacture of high shape accuracy and surface quality optics without any mechanic post-processing step. The efficiency of the PGM process depends primarily on the lifetime of the high-precision molds made of cemented tungsten carbide. During each molding cycle, the molds have to withstand severe thermo-chemical and thermo-mechanical loads. Using protective coatings, the lifetime of the molds can be increased. In this study, the performances of a diamond-like carbon (DLC) and a precious metal alloy coating, namely PtIr, were evaluated in an industrial glass molding machine. The degradation mechanisms of the coatings were analyzed using surface characterization such as scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). At this, phenomena such as glass adhesion and coating disintegration were observed.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
Section titled āReferencesā- 2016 - Precision glass molding: toward an optimal fabrication of optical lenses
- 2013 - Fabrication of Complex Optical Components: From Mold Design to Product [Crossref]
- 2016 - Precision Glass Molding - Cost efficient production of glass optics with spectral range from 180 nm ultraviolet to 13 Ī¼m thermal infrared
- 2008 - Design of protective coatings for glass lens molding