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:
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.
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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Artikel in diesem Heft
- Experimental determination of the solubility constant of kurnakovite, MgB3O3(OH)5·5H2O
- Elastic properties of majoritic garnet inclusions in diamonds and the seismic signature of pyroxenites in the Earth’s upper mantle
- Establishing a protocol for the selection of zircon inclusions in garnet for Raman thermobarometry
- Reversely zoned plagioclase in lower crustal meta-anorthosites: An indicator of multistage fracturing and metamorphism in the lower crust
- High-pressure silica phase transitions: Implications for deep mantle dynamics and silica crystallization in the protocore
- The Cr-Zr-Ca armalcolite in lunar rocks is loveringite: Constraints from electron backscatter diffraction measurements
- Effects of composition and pressure on electronic states of iron in bridgmanite
- Ti diffusion in feldspar
- Radiation-induced defects in montebrasite: An electron paramagnetic resonance study of O– hole and Ti3+ electron centers
- New IR spectroscopic data for determination of water abundances in hydrous pantelleritic glasses
- Experimental investigation of the effect of nickel on the electrical resistivity of Fe-Ni and Fe-Ni-S alloys under pressure
- An experimental approach to examine fluid-melt interaction and mineralization in rare-metal pegmatites
- Crystal-chemistry of sulfates from the Apuan Alps (Tuscany, Italy). VI. Tl-bearing alum-(K) and voltaite from the Fornovolasco mining complex
- Letter
- First-principles modeling of X-ray absorption spectra enlightens the processes of scandium sequestration by iron oxides
- Effects of the dissolution of thermal barrier coating materials on the viscosity of remelted volcanic ash
- New Mineral Names