Effect of Gd content on mechanical properties and erosion durability of sub-stoichiometric Gd2Zr2O7

Michael P. Schmitt, Jamesa L. Stokes, Brenna L. Gorin, Amarendra K. Rai, Dongming Zhu, Timothy John Eden, Douglas Edward Wolfe

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Advanced thermal barrier coating materials are necessary to improve the efficiency of next-generation gas turbine engines. As such, different TBC chemistries must be developed with enhanced temperature stability above that of 7YSZ (~ 1200 °C) while maintaining thermal and mechanical reliability. The present study investigates the effect of rare earth content on the mechanical properties of ZrO2 TBCs. Various cubic compositions in the ZrO2-GdO1.5 system were investigated in the form of monolithic pellets and coatings with stoichiometric GZO serving as reference. The fracture toughness and erosion durability were evaluated, and it was found that fracture toughness decreased with increasing rare-earth content, 15.66 mol% GdO1.5 yielding 1.25 MPa m1/2, compared to 1.04 MPa m1/2 for GZO (50 mol% GdO1.5). It was observed that the erosion performance of the coatings was much more sensitive to the changes in mechanical properties than the bulk specimens and showed a 125% increase through the fluorite region to GZO whereas the dense pellets only exhibited a 33% increase in erosion behavior. These results indicate that cubic ZrO2 phase with reduced rare-earth content show promise as TBC materials with improved durability over GZO as well as temperature stability in this region of the phase diagram.

Original languageEnglish (US)
Pages (from-to)177-183
Number of pages7
JournalSurface and Coatings Technology
Volume313
DOIs
StatePublished - Mar 15 2017

Fingerprint

durability
Rare earths
erosion
Erosion
Durability
rare earth elements
mechanical properties
fracture strength
coatings
pellets
Mechanical properties
Fracture toughness
Ore pellets
gas turbine engines
Coatings
Thermal barrier coatings
Fluorspar
fluorite
Phase diagrams
Gas turbines

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Schmitt, Michael P. ; Stokes, Jamesa L. ; Gorin, Brenna L. ; Rai, Amarendra K. ; Zhu, Dongming ; Eden, Timothy John ; Wolfe, Douglas Edward. / Effect of Gd content on mechanical properties and erosion durability of sub-stoichiometric Gd2Zr2O7 In: Surface and Coatings Technology. 2017 ; Vol. 313. pp. 177-183.
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abstract = "Advanced thermal barrier coating materials are necessary to improve the efficiency of next-generation gas turbine engines. As such, different TBC chemistries must be developed with enhanced temperature stability above that of 7YSZ (~ 1200 °C) while maintaining thermal and mechanical reliability. The present study investigates the effect of rare earth content on the mechanical properties of ZrO2 TBCs. Various cubic compositions in the ZrO2-GdO1.5 system were investigated in the form of monolithic pellets and coatings with stoichiometric GZO serving as reference. The fracture toughness and erosion durability were evaluated, and it was found that fracture toughness decreased with increasing rare-earth content, 15.66 mol{\%} GdO1.5 yielding 1.25 MPa m1/2, compared to 1.04 MPa m1/2 for GZO (50 mol{\%} GdO1.5). It was observed that the erosion performance of the coatings was much more sensitive to the changes in mechanical properties than the bulk specimens and showed a 125{\%} increase through the fluorite region to GZO whereas the dense pellets only exhibited a 33{\%} increase in erosion behavior. These results indicate that cubic ZrO2 phase with reduced rare-earth content show promise as TBC materials with improved durability over GZO as well as temperature stability in this region of the phase diagram.",
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Effect of Gd content on mechanical properties and erosion durability of sub-stoichiometric Gd2Zr2O7 . / Schmitt, Michael P.; Stokes, Jamesa L.; Gorin, Brenna L.; Rai, Amarendra K.; Zhu, Dongming; Eden, Timothy John; Wolfe, Douglas Edward.

In: Surface and Coatings Technology, Vol. 313, 15.03.2017, p. 177-183.

Research output: Contribution to journalArticle

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AU - Schmitt, Michael P.

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AU - Zhu, Dongming

AU - Eden, Timothy John

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