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Molten calcium–magnesium–aluminosilicate interactions with ytterbium disilicate environmental barrier coating

Published online by Cambridge University Press:  14 August 2020

Valerie L. Wiesner Open the ORCID record for Valerie L. Wiesner [Opens in a new window] ,
Bryan J. Harder ,
Anita Garg  and
Narottam P. Bansal
Valerie L. Wiesner*
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA Advanced Materials and Processing Branch, NASA Langley Research Center, Hampton, Virginia23681, USA
Bryan J. Harder
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA
Anita Garg
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA University of Toledo, Toledo, Ohio43606, USA
Narottam P. Bansal
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Thermochemical interactions between calcium–magnesium–aluminosilicate (CMAS) glass and an environmental barrier coating of ytterbium disilicate (Yb2Si2O7) and ytterbium monosilicate (Yb2SiO5) were investigated. Top coats were deposited by plasma spray-physical vapor deposition onto silicon carbide substrates. CMAS powder was prepared as a glass and cast into a tape to yield a CMAS loading of ~29 mg/cm2. Samples were heat treated with CMAS at 1300 °C for 1–10 h or at 1400 °C for 1 h in air. Polished specimen cross-sections were characterized using scanning electron microscopy, X-ray diffraction, X-ray energy-dispersive spectroscopy, and transmission electron microscopy to evaluate resulting microstructures, phases, and compositions at CMAS/Yb2Si2O7 interfaces. Coatings exposed at 1300 °C—10 h and 1400 °C—1 h were fully infiltrated and compromised by CMAS. Dissolution of ytterbium silicate into molten CMAS followed by precipitation of cyclosilicate, silicocarnotite, and Yb2Si2O7 at 1300 °C and Yb2Si2O7 at 1400 °C enabled CMAS to effectively infiltrate top coats, rendering the predominantly Yb2Si2O7 coating ineffective at arresting molten CMAS degradation.

Keywords

glasscoatingenvironmentally protectivetransmission electron microscopy (TEM)
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 17: Focus Issue: Sand-phobic Thermal/Environmental Barrier Coatings for Gas Turbine Engines , 14 September 2020 , pp. 2346 - 2357
Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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References

Bansal, N.P. and Lamon, J.: Ceramic Matrix Composites: Materials, Modeling and Technology (John Wiley & Sons, Hoboken, NJ, USA, 2014).Google Scholar
Opila, E.J., Smialek, J.L., Robinson, R.C., Fox, D.S., and Jacobson, N.S.: SiC recession caused by SiO2 scale volatility under combustion conditions: II, thermodynamics and gaseous-diffusion model. J. Am. Ceram. Soc. 82, 1826 (1999).CrossRefGoogle Scholar
Opila, E.J., Fox, D.S., and Jacobson, N.S.: Mass spectrometric identification of Si–O–H(g) species from the reaction of silica with water vapor at atmospheric pressure. J. Am. Ceram. Soc. 80, 1009 (1997).CrossRefGoogle Scholar
Levi, C.G.: Emerging materials and processes for thermal barrier systems. Curr. Opin. Solid State Mater. Sci. 8, 77 (2004).CrossRefGoogle Scholar
Costa, G.C. and Jacobson, N.S.: Mass spectrometric measurements of the silica activity in the Yb2O3–SiO2 system and implications to assess the degradation of silicate-based coatings in combustion environments. J. Eur. Ceram. Soc. 35, 4259 (2015).CrossRefGoogle Scholar
Lee, K.N., Fox, D.S., and Bansal, N.P.: Rare earth silicate environmental barrier coatings for SiC/SiC composites and Si3N4 ceramics. J. Eur. Ceram. Soc. 25, 1705 (2005).CrossRefGoogle Scholar
Lee, K.N.: Environmental barrier coatings for SiCf/SiC. In Ceramic Matrix Composites: Materials, Modeling and Technology, Bansal, N.P., and Lamon, J., eds. John Wiley and Sons, Hoboken, NJ, USA, 2014); pp. 430.Google Scholar
Wiesner, V.L., Vempati, U.K., and Bansal, N.P.: High temperature viscosity of calcium-magnesium-aluminosilicate glass from synthetic sand. Scr. Mater. 124, 189 (2016).CrossRefGoogle Scholar
Song, W., Lavallée, Y., Hess, K.-U., Kueppers, U., Cimarelli, C., and Dingwell, D.B.: Volcanic ash melting under conditions relevant to ash turbine interactions. Nat. Commun. 7, 1–10 (2016).CrossRefGoogle ScholarPubMed
Zhang, B., Song, W., and Guo, H.: Wetting, infiltration and interaction behavior of CMAS towards columnar YSZ coatings deposited by plasma spray physical vapor. J. Eur. Ceram. Soc. 38, 3564 (2018).CrossRefGoogle Scholar
Harder, B.J., Almer, J.D., Weyant, C.M., Lee, K.N., and Faber, K.T.: Residual stress analysis of multilayer environmental barrier coatings. J. Am. Ceram. Soc. 92, 452 (2009).CrossRefGoogle Scholar
Stolzenburg, F., Kenesei, P., Almer, J., Lee, K.N., Johnson, M.T., and Faber, K.T.: The influence of calcium–magnesium–aluminosilicate deposits on internal stresses in Yb2Si2O7 multilayer environmental barrier coatings. Acta Mater. 105, 189 (2016).CrossRefGoogle Scholar
Grant, K.M., Krämer, S., Seward, G.G.E., and Levi, C.G.: Calcium–magnesium alumino-silicate interaction with yttrium monosilicate environmental barrier coatings. J. Am. Ceram. Soc. 93, 3504 (2010).CrossRefGoogle Scholar
Wiesner, V.L., Harder, B.J., and Bansal, N.P.: High-temperature interactions of desert sand CMAS glass with yttrium disilicate environmental barrier coating material. Ceram. Int. 44, 22738 (2018).CrossRefGoogle Scholar
Stokes, J.L., Harder, B.J., Wiesner, V.L., and Wolfe, D.E.: Effects of crystal structure and cation size on molten silicate reactivity with environmental barrier coating materials. J. Am. Ceram. Soc. 103, 622 (2020).CrossRefGoogle Scholar
Wiesner, V.L., Scales, D., Johnson, N.J., Harder, B.J., Garg, A., and Bansal, N.P.: Calcium-magnesium aluminosilicate interactions with ytterbium disilicate environmental barrier material at elevated temperatures. Ceram. Int., 16733–16742 (2020).CrossRefGoogle Scholar
Stolzenburg, F., Johnson, M.T., Lee, K.N., Jacobson, N.S., and Faber, K.T.: The interaction of calcium-magnesium-aluminosilicate with ytterbium silicate environmental barrier materials. Surf. Coat. Technol. 284, 44 (2015).CrossRefGoogle Scholar
Turcer, L.R., Krause, A.R., Garces, H.F., Zhang, L., and Padture, N.P.: Environmental-barrier coating ceramics for resistance against attack by molten calcia-magnesia-aluminosilicate (CMAS) glass: Part II, β-Yb2Si2O7 and β-Sc2Si2O7. J. Eur. Ceram. Soc. 38, 3914 (2018).CrossRefGoogle Scholar
Stokes, J.L., Harder, B.J., Wiesner, V.L., and Wolfe, D.E.: High-Temperature thermochemical interactions of molten silicates with Yb2Si2O7 and Y2Si2O7 environmental barrier coating materials. J. Eur. Ceram. Soc. 39, 5059 (2019).CrossRefGoogle Scholar
Poerschke, D.L., Jackson, R.W., and Levi, C.G.: Silicate deposit degradation of engineered coatings in gas turbines: Progress toward models and materials solutions. Annu. Rev. Mater. Res. 47, 297 (2017).CrossRefGoogle Scholar
Sleeper, J., Garg, A., Wiesner, V.L., and Bansal, N.P.: Thermochemical interactions between CMAS and Ca2Y8(SiO4)6O2 apatite environmental barrier coating material. J. Eur. Ceram. Soc. 39, 5380 (2019).CrossRefGoogle Scholar
Zhao, H., Richards, B.T., Levi, C.G., and Wadley, H.N.G.: Molten silicate reactions with plasma sprayed ytterbium silicate coatings. Surf. Coat. Technol. 288, 151 (2016).CrossRefGoogle Scholar
Refke, A., Gindrat, M., von Niessen, K., and Damani, R.: LPPS thin film: A hybrid coating technology between thermal spray and PVD for functional thin coatings and large area applications. Therm. Spray, 705–710 (2007).Google Scholar
Mauer, G., Hospach, A., Zotov, N., and Vaßen, R.: Process conditions and microstructures of ceramic coatings by gas phase deposition based on plasma spraying. J. Therm. Spray Technol. 22, 83 (2013).CrossRefGoogle Scholar
Bakan, E., Marcano, D., Zhou, D., Sohn, Y.J., Mauer, G., and Vaßen, R.: Yb2Si2O7 environmental barrier coatings deposited by various thermal spray techniques: A preliminary comparative study. J. Therm. Spray Technol. 26, 1011 (2017).CrossRefGoogle Scholar
Wiesner, V.L. and Bansal, N.P.: Crystallization kinetics of calcium–magnesium aluminosilicate (CMAS) glass. Surf. Coat. Technol. 259, Part C(0), 608 (2014).CrossRefGoogle Scholar
Wiesner, V.L. and Bansal, N.P.: Mechanical and thermal properties of calcium–magnesium aluminosilicate (CMAS) glass. J. Eur. Ceram. Soc. 35, 2907 (2015).CrossRefGoogle Scholar
Harder, B.J.: Oxidation performance of Si-HfO2 environmental barrier coating bond coats deposited via plasma spray-physical vapor deposition. Surf. Coat. Technol. 384, 125311-8 (2020).CrossRefGoogle Scholar
Poerschke, D.L., Seward, G.G., and Levi, C.G.: Influence of Yb: Hf ratio on Ytterbium Hafnate/Molten Silicate (CMAS) reactivity. J. Am. Ceram. Soc. 99, 651 (2016).CrossRefGoogle Scholar
Bansal, N.P. and Doremus, R.H.: Handbook of Glass Properties (Academic Press, New York City, 1986).Google Scholar
Aygun, A., Vasiliev, A.L., Padture, N.P., and Ma, X.: Novel thermal barrier coatings that are resistant to high-temperature attack by glassy deposits. Acta Mater. 55, 6734 (2007).CrossRefGoogle Scholar
Harder, B.J., Zhu, D., Schmitt, M.P., and Wolfe, D.E.: Microstructural effects and properties of non-line-of-sight coating processing via plasma spray-physical vapor deposition. J. Therm. Spray Technol. 26, 1052 (2017).CrossRefGoogle Scholar