Interactions between zirconia–yttria–tantala thermal barrier oxides and silicate melts

Abdul-Jabbar, Najeb Mohammed; Fernandez, Abel N.; Jackson, Richard Wesley; Park, Daesung; Summers, William D.; Levi, Carlos G.

doi:10.1016/j.actamat.2019.11.060

Title: Interactions between zirconia–yttria–tantala thermal barrier oxides and silicate melts

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Abstract

The effects of TaO_2.5 additions to Y₄Zr₃O₁₂ (YZO) on its interactions with calcium-magnesium alumino-silicate (CMAS) melts are investigated herein. YZO is a candidate material for the protection of novel ZrO₂-YO_1.5-TaO_2.5 based thermal barrier coatings (TBCs) against CMAS attack, but thermochemical considerations dictate that YZO contain TaO_2.5 for interfacial compatibility. Oxides based on Y₄Zr_3-xTa_xO_12+0.5x (x = =0, 0.7, 1.4) were mixed with various ternary and quinary silicate compositions ranging in Ca:Si ratio from 0.35 to 1.13 and equilibrated at 1300 °C. The results show that all combinations form the desired apatite phase except for the mixture of the higher Ta⁵⁺ content with the lowest Ca:Si melt. It is found that the addition of Ta⁵⁺ increases the capture of Y³⁺ by the reprecipitated fluorite, decreasing the amount available to form apatite and eventually suppressing it at low Ca:Si. The effect is ascribed to the attractive interactions between Y³⁺ and Ta⁵⁺ in solid solution, similar to that found in tetragonal zirconia, but with concurrent incorporation of anion vacancies associated with excess Y³⁺ that stabilize the cubic form. As the Ca²⁺ content of the melt increases, so does the amount of Ca²⁺ incorporated in fluorite. The latter also interacts attractively with Ta⁵⁺ and leadsmore »« less

Authors:

^[1]; Fernandez, Abel N. ^[2]; Jackson, Richard Wesley ^[2]; Park, Daesung ^[2]; Summers, William D. ^[2]; Levi, Carlos G. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Santa Barbara, CA (United States)
Univ. of California, Santa Barbara, CA (United States)

Publication Date:: Fri Nov 29 00:00:00 EST 2019

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)

OSTI Identifier:: 1601623

Report Number(s):: LA-UR-19-25329
Journal ID: ISSN 1359-6454

Grant/Contract Number:: 89233218CNA000001; DMR 1720256; DMR 1105672; N00014-16-1–2702

Resource Type:: Accepted Manuscript

Journal Name:: Acta Materialia

Additional Journal Information:: Journal Volume: 185; Journal Issue: C; Journal ID: ISSN 1359-6454

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Thermal barrier coating (TBC); Calcium-magnesium alumino-silicates (CMAS); Rare-earth oxide; Phase equilibria

Citation Formats


                    Abdul-Jabbar, Najeb Mohammed, Fernandez, Abel N., Jackson, Richard Wesley, Park, Daesung, Summers, William D., and Levi, Carlos G. Interactions between zirconia–yttria–tantala thermal barrier oxides and silicate melts.  United States: N. p., 2019. 
Web.  doi:10.1016/j.actamat.2019.11.060.

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                    Abdul-Jabbar, Najeb Mohammed, Fernandez, Abel N., Jackson, Richard Wesley, Park, Daesung, Summers, William D., & Levi, Carlos G. Interactions between zirconia–yttria–tantala thermal barrier oxides and silicate melts.  United States.  https://doi.org/10.1016/j.actamat.2019.11.060

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                    Abdul-Jabbar, Najeb Mohammed, Fernandez, Abel N., Jackson, Richard Wesley, Park, Daesung, Summers, William D., and Levi, Carlos G. Fri .  
"Interactions between zirconia–yttria–tantala thermal barrier oxides and silicate melts".  United States.  https://doi.org/10.1016/j.actamat.2019.11.060.  https://www.osti.gov/servlets/purl/1601623.

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@article{osti_1601623,

  title        = {Interactions between zirconia–yttria–tantala thermal barrier oxides and silicate melts},

  author       = {Abdul-Jabbar, Najeb Mohammed and Fernandez, Abel N. and Jackson, Richard Wesley and Park, Daesung and Summers, William D. and Levi, Carlos G.},

  abstractNote = {The effects of TaO2.5 additions to Y4Zr3O12 (YZO) on its interactions with calcium-magnesium alumino-silicate (CMAS) melts are investigated herein. YZO is a candidate material for the protection of novel ZrO2-YO1.5-TaO2.5 based thermal barrier coatings (TBCs) against CMAS attack, but thermochemical considerations dictate that YZO contain TaO2.5 for interfacial compatibility. Oxides based on Y4Zr3-xTaxO12+0.5x (x = =0, 0.7, 1.4) were mixed with various ternary and quinary silicate compositions ranging in Ca:Si ratio from 0.35 to 1.13 and equilibrated at 1300 °C. The results show that all combinations form the desired apatite phase except for the mixture of the higher Ta5+ content with the lowest Ca:Si melt. It is found that the addition of Ta5+ increases the capture of Y3+ by the reprecipitated fluorite, decreasing the amount available to form apatite and eventually suppressing it at low Ca:Si. The effect is ascribed to the attractive interactions between Y3+ and Ta5+ in solid solution, similar to that found in tetragonal zirconia, but with concurrent incorporation of anion vacancies associated with excess Y3+ that stabilize the cubic form. As the Ca2+ content of the melt increases, so does the amount of Ca2+ incorporated in fluorite. The latter also interacts attractively with Ta5+ and leads to a reduction of captured Y3+ in fluorite as the Ca content in the reacting deposit increases. This serves to increase the amount of Y3+available in the melt to form apatite in TBC-CMAS interactions.},

  doi          = {10.1016/j.actamat.2019.11.060},

  journal      = {Acta Materialia},

  number       = C,

  volume       = 185,

  place        = {United States},

  year         = {Fri Nov 29 00:00:00 EST 2019},

  month        = {Fri Nov 29 00:00:00 EST 2019}

}

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