A New Model for Describing the Glass to Metal Interaction in Forming

Christian Roos; Jan-Hendrik Veltmaat; Philipp Jacobs

doi:10.52825/glass-europe.v2i.976

Authors

Christian Roos RWTH Aachen University https://orcid.org/0000-0003-4709-8968
Jan-Hendrik Veltmaat RWTH Aachen University https://orcid.org/0009-0008-8422-068X
Philipp Jacobs RWTH Aachen University https://orcid.org/0009-0000-4487-156X

DOI:

https://doi.org/10.52825/glass-europe.v2i.976

Keywords:

Glass-Metal Contact, Sticking Temperatures, Wetting, Spreading, Interface Viscosity, Molecular Kinetic Model, Metal Oxides

Abstract

The interaction between molten glass and metallic molds plays a crucial role in industrial glass-forming. Glass-metal sticking is usually described in terms of material- and process-dependent “sticking temperatures”; however, these parameters tell little about the underlying physical processes such as adhesion, wetting and spreading. We show that the molecular-kinetic spreading model, originally developed for liquids at room temperature, is also valid for a droplet of molten glass on different substrate materials: Measured contact angles and spreading velocities yield plausible values for the molecular jump rate k_s ≈ 10¹² Hz and jump distance λ ≈ 3–6 Å. In addition, we argue that the real-world glass–metal contact is actually the contact between a liquid oxide (the glass melt) and a solid oxide (the metal’s oxide layer). The spatial dominance of oxygen ions might explain why sticking temperatures appear to be only weakly dependent on the contact material’s chemical composition. Both findings lead us to the conclusion that the current theory of glass-metal interaction should be revisited.

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References

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A New Model for Describing the Glass to Metal Interaction in Forming

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