Thermo-Optical Set-Up to Investigate Non-Isothermal Glass-Metal Contact
DOI:
https://doi.org/10.52825/glass-europe.v3i.2866Keywords:
Glass-Metal Contact, Glass-Oxide Contact, Wetting, StickingAbstract
The development of innovative mold materials and coatings for glass forming, relies on a profound understanding of the interaction between glass melt and the respective metallic or oxidic surface. In order to revise the existing theories on sticking temperatures and viscosities, a new thermo-optical setup was constructed that enables the investigation of the non-isothermal bonding behavior of glass melts on different substrates. A glass gob is generated in an upper furnace at temperatures of up to 1200 °C and is then poured onto an individually heated substrate (the respective contact material) at temperatures similar to container glass forming. The resulting movement of the gob at pouring and on the substrate is observed with a high-speed camera. The set-up was tested with a soda lime silicate glass melt in contact with various metallic, carbon-based and ceramic materials. Sticking temperatures for the different materials were determined and compared to the results found in literature. Contact temperatures at which sticking occurs varied significantly with the investigated material. A critical interface temperature (respectively viscosity of 108.8 Pas) as obtained by previous researchers could not be found, instead the temperature range for sticking was almost 200 K. Some materials resisted sticking even at temperatures up to 600 °C with the interface viscosity being below 108.8 Pas. Interestingly, those substrates also showed non-wetting behavior in previous heating micros-copy trials, suggesting that wettability plays a more important role for sticking than assumed so far.
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Copyright (c) 2025 Pawel Engelmann; Christian Roos
This work is licensed under a Creative Commons Attribution 4.0 International License.
Accepted 2025-09-22
Published 2025-10-10
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Deutsche Forschungsgemeinschaft
Grant numbers RO 5831/8-1