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Crystallization and microstructure of a glass seal for rapid laser sealing in the system CaO/Al2O3/SiO2

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Abstract

A glass with the composition 61 CaO·30 Al2O3·9 SiO2 was studied with respect to its crystallization behavior and its suitability as a rapidly crystallizing material for laser sealing. The glass was studied by differential scanning calorimetry; from the profiles recorded, Avrami activation energies and Avrami coefficients were calculated. The latter are in the range between 0.99 and 1.55 which is supposedly attributed to sole surface crystallization. During thermal treatment as well as during laser sealing, Ca12Al14O33, CaAl2O4 and Ca3Al2O6 are formed. These phases were also observed in SEM micrographs as evidenced by electron backscatter diffraction from the attributed Kikuchi patterns. Transmission electron microscopy showed a crystallized CaO- and SiO2-enriched interface which strongly adhered to the Al2O3 ceramic. The porosity of the crystallized seal was in the order of few percent. The studied glass proved suitable as crystallizing seal for rapid laser sealing.

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Acknowledgements

These investigations were conducted with the kind support of the Arbeitsgemeinschaft industrieller Forschungsvereinigungen (AiF), Köln, by agency of the Hüttentechnische Vereinigung der Deutschen Glasindustrie (HVG), Frankfurt/Main, through the resources of the Bundesministerium für Wirtschaft (Grant: IGF 17751 BR).

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Authors and Affiliations

  1. Otto-Schott-Institut für Materialforschung, Jena University, Fraunhoferstr. 6, 07743, Jena, Germany

    Franziska Döhler, Tilman Zscheckel & Christian Rüssel

  2. Günter-Köhler-Institut für Fügetechnik und Werkstoffprüfung GmbH, Otto-Schott-Str. 13, Jena, Germany

    Susanne Kasch & Thomas Schmidt

  3. Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Walter-Huelse-Straße 1, 06120, Halle (Saale), Germany

    Christian Patzig & Thomas Höche

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  1. Franziska Döhler
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  2. Tilman Zscheckel
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Correspondence to Christian Rüssel.

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Döhler, F., Zscheckel, T., Kasch, S. et al. Crystallization and microstructure of a glass seal for rapid laser sealing in the system CaO/Al2O3/SiO2. J Mater Sci 53, 16207–16219 (2018). https://doi.org/10.1007/s10853-018-2786-2

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