Investigation of the Interfacial Reaction between Optical Glasses and Various Protective Films and Mold Materials

Choung Lii Chao; Cheng Bang Huo; Wen Chen Chou; Tzung Shian Wu; Kung Jeng Ma; Chien Huang Kuo; Ying Tung Chen; Chung Woei Chao

doi:10.4028/www.scientific.net/DDF.297-301.808

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 297-301Investigation of the Interfacial Reaction between...

Investigation of the Interfacial Reaction between Optical Glasses and Various Protective Films and Mold Materials

Abstract:

The glass molding process (GMP) is regarded as a very promising technique for mass producing high precision optical components such as spherical/ aspheric glass lenses and free-form optics. However, only a handful of materials can sustain the chemical reaction, mechanical stress and temperature involved in the glass molding process. Besides, almost all of these mold materials are classified as hard-to-machine materials. This makes the machining of these materials to sub-micrometer form accuracy and nanometer surface finish a rather tough and expensive task. As a result, making mold life longer has become extremely critical in the GMP industry. The interfacial chemical reaction between optical glass and mold is normally the main reason for pre-matured mold failure. This research aimed to investigate the interfacial chemical reaction between various optical glasses, different anti-stick coating designs and several mold materials. The results showed that glass composition, coating design (composition, microstructure, thickness), environment (vacuum, air or in protective gas), reaction temperature and time could all have profound effects on the interfacial chemical reaction. Based on the results, a design developed specially for certain glasses is more likely to be the viable way of optimizing the effect of the protective coating.

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Periodical:

Defect and Diffusion Forum (Volumes 297-301)

Pages:

808-813

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.297-301.808

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Online since:

April 2010

Authors:

Choung Lii Chao, Cheng Bang Huo, Wen Chen Chou, Tzung Shian Wu, Kung Jeng Ma, Chien Huang Kuo, Ying Tung Chen, Chung Woei Chao

Keywords:

Coating, Glass Molding , Interfacial Reaction, Optical Glass, Sticking Problem

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