Startseite Effects of the dissolution of thermal barrier coating materials on the viscosity of remelted volcanic ash
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Effects of the dissolution of thermal barrier coating materials on the viscosity of remelted volcanic ash

  • Dirk Müller EMAIL logo , Kai-Uwe Hess , Ulrich Kueppers und Donald B. Dingwell
Veröffentlicht/Copyright: 30. Juni 2020
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Abstract

The chemical interaction between remelted volcanic ash and ceramic coatings of yttria-stabilized zirconia (YSZ) and/or gadolinium zirconate (GZO) is of special importance for the design of volcanic ash melt-resistant thermal barrier coatings (TBCs) for aviation turbine technologies. The spreading and infiltration potential of the melts is strongly influenced by the melt viscosity. Thus the interpretation of infiltration experiments and modeling of infiltration processes both rely on accurate viscosity data. Melt viscosity may be significantly altered by the dissolution of the YSZ or GZO thermal barrier coatings during the infiltration process. Here, we have determined the influence of YSZ and GZO additions to the viscosity of a series of volcanic ash melts using high-temperature concentric cylinder viscometry. All samples have been characterized fully after viscometry. At 6.5 wt% of YSZ or GZO, both dopants lead to a reduction of viscosity in a temperature range between 1297–1640 °C in air. The magnitude of the decrease in viscosity depends weakly on volcanic ash melt composition. The viscosity effect has been parameterized in the following form:

Δη=xmdopant

whereby x is a melt-composition specific coefficient of viscosity decrease, and mdopant represents the added amount of YSZ/GZO (wt%). This viscosity reduction should contribute to an acceleration of the physical infiltration of TBCs via remelted volcanic ash.

Acknowledgments

We thank Hilger W. Lohringer for EPMA sample preparation. Gerhard Wolf is acknowledged to make the YSZ and GZO powders available for us and Álvaro Amigo Ramos for collecting the Cordon Caulle sample.

  1. Funding

    D.M. acknowledges funding by the German Federal Ministry for Economic Affairs and Energy (VAsCo, IGF No. 189 EN/2) and the support by the LMUMentoring program as part of the German University Excellence Initiative. D.B.D. acknowledges the support of ERC Advanced Grant ADG-2018-834225 (EAVESDROP).

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Received: 2019-10-15
Accepted: 2020-03-05
Published Online: 2020-06-30
Published in Print: 2020-07-28

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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