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Phase formation and microstructure during laser sintering and crystallization of a 4.2 MgO·5.0 ZnO·44.1 CaO·26.7 Al2O3·20.0 SiO2 glass

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Abstract

In order to produce housings for high-temperature applications, alumina is a highly advantageous material because it has a high chemical durability and withstands high temperatures. If alumina is to be sealed, materials are necessary which have an adapted coefficient of thermal expansion (8.6 × 10−6 K−1). If temperature-sensitive components have to be encapsulated, a rapid laser sealing process is highly advantageous. This process requires a glass which can rapidly be crystallized. In this paper, a glass powder with the composition 4.2 MgO·5.0 ZnO·44.1·CaO·26.7 Al2O3·20.0 SiO2 was sintered and subsequently crystallized using a CO2-laser. As crystalline phases, predominantly a solid solution of akermanite and gehlenite (AGSS) was formed and as phases with minor concentrations Al2O3, spinel/gahnite solid solution and ZnO. The AGSS grains have sizes of approximately 5 µm, and Mg and Zn are enriched at the grain boundaries. After sealing at temperatures of 985 and 1135 °C, a similar microstructure and similar grain sizes were observed. The AGSS seems to nucleate at the glass/Al2O3 interface but also in the bulk. The AGSS and all other phases do not show a preferred orientation. The resulting coefficients of thermal expansion fit well to that of Al2O3.

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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

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

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Döhler, F., Zscheckel, T., Kasch, S. et al. Phase formation and microstructure during laser sintering and crystallization of a 4.2 MgO·5.0 ZnO·44.1 CaO·26.7 Al2O3·20.0 SiO2 glass. J Mater Sci 52, 9344–9354 (2017). https://doi.org/10.1007/s10853-017-1151-1

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