Thermal barrier coating by electron beam-physical vapor deposition of zirconia co-doped with yttria and niobia

Almeida, Daniel Soares de; Cairo, Carlos Alberto Alves; Silva, Cosme Roberto M.; Nono, Maria do Carmo A.

doi:10.5028/jatm.2010.02026910

Abstract:

The most usual ceramic material for coating turbine blades is yttria doped zirconia. Addition of niobia, as a co-dopant in the Y₂O₃-ZrO₂ system, can reduce the thermal conductivity and improve mechanical properties of the coating. The purpose of this work was to evaluate the influence of the addition of niobia on the microstructure and thermal properties of the ceramic coatings. SEM on coatings fractured cross-section shows a columnar structure and the results of XRD show only zirconia tetragonal phase in the ceramic coating for the chemical composition range studied. As the difference NbO_2,5-YO_1,5 mol percent increases, the tetragonality increases. A significant reduction of the thermal conductivity, measured by laser flash technique in the zirconia coating co-doped with yttria and niobia when compared with zirconia-yttria coating was observed.

Keywords:
TBC; EB-PVD; Zirconia; Niobia; Thermal conductivity

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REFERENCES

Almeida, D. S. et al, 2006, "EB-PVD TBCs of Zirconia Co-doped with Yttria and Niobia, a Microstructural Investigation", Surface and Coatings Technology, Vol. 200, pp. 2827-2833.
Almeida, D. S. et al, 2007, "Thermal conductivity investigation of zirconia co-doped with yttria and niobia EB-PVD TBCs", Materials Science and Engineering: A, Vol. 443, pp. 60-65.
Bernier, J. S., et al, 2003, "Crystallographic texture of EB-PVD TBCs deposited on stationary flat surfaces in a multiple ingot coating chamber as function of chamber position", Surface and Coatings Technology, Vol. 95-99, pp. 163-164.
Couto, P.; et al, 2003, "Flash method standardization in Brazil for the measurement of solid thermophysical properties", In: Metrologia-2003, Pernambuco. Anais.... Recife, Pernambuco, Brasil, Sociedade Brasileira de Metrologia.
Czek, N. et al, 1999, "Studies of the bond-coat oxidation and phase structure of TBC", Surface and Coatings Technology, Vol. 113, pp. 157-164.
Degiovaninni, A., Lament, M., 1986, "Une nouvelle technique d'identification de la diffusivite thermique pour de methode flash", Revue de Physique Appliquée, Vol. 21, pp. 229-237.
Evans, A. G., He, M. Y., Hutchinson, J. W., 2001, "Mechanics-based scaling laws for the durability of TBC", Progress in Materials Science, Vol. 46, No 3-4, pp. 249-271.
Funatani, K., 2000, "Emerging technology in surface modification of light metal", Surface and Coatings Technology, Vol. 133-134, pp. 264-272.
Goward, G. W., 1998, "Progress in coating for gas turbine airfoils", Surface and Coatings Technology, Vol. 108-109, pp. 73-79.
Guo, H. et al, 2001, "Microstructure investigation on gradient porous TBC prepared by EB-PVD", Scripta Materialia, Vol. 44, No 4, pp. 683-687.
Guo, X.; Wang, Z., 1998, "Effect of niobia on the defect structure of yttria-stabilized zirconia", Journal of the European Ceramic Society, Vol. 18, pp. 237-240.
Hass, D.D., 2001, "Thermal barrier coatings via directed vapor deposition" 281p. Doctorate thesis, University of Virginia, Charlottesville, VA.
Henke, B.L. et al, "Atomic Scatering Facts for the Elements", Atomic Data and Nuclear Data Tables, Vol. 54, No 2, p. 181.
Kim, D. J., 1990, "Effect of Ta₂O₅, Nb₂O₅, and HfO₂ alloying on the transformability of Y₂O₃-stabilized tetragonal ZrO₂", Journal of the American Ceramic Society, Vol. 1, No 73, pp. 115-20.
Kim, D. J., 1990, "Effect of Ta₂O₅, Nb₂O₅, and HfO₂ alloying on the transformability of Y₂O₃-stabilized tetragonal ZrO₂", Journal of the American Ceramic Society, Vol. 1, No 73, pp. 115-20.
Kim, D. J.; Tien, T. Y., 1991, "Phase stability and physical properties of cubic and tetragonal ZrO₂ in the system ZrO₂ - Y₂O₃ - Ta₂O₅", Journal of the American Society, Vol. 12, No 74, pp. 3061-65.
Lee, D. Y.; Kim, D. J.; Cho, D. H., 1998, "Low thermal phase stability and mechanical properties of Y₂O₃ and Nb₂O₅ co-doped tetragonal zirconia polycrystal ceramics", Journal of Materials Science Letters, Vol. 17, pp. 185-187.
Lehmann, H. et al, 2003, "Thermal conductivity and thermal expansion coefficients of the lanthanum rare-earth-element zirconate system", Journal of the American Ceramic Society, Vol. 86, No 8, pp.1138-44.
Mumm, D. R.; Evans, A. G.; Spitsberg, I. T., 2001, "Characterization of a cyclic displacement instability for a TGO in a TBC", Acta Materialia, Vol. 49, No 12, pp. 2329-2340.
Nicholls, J. R. et al, 2002, "Methods to reduce the thermal conductivity of EB-PVD TBCs", Surface and Coatingss Technology, No 151-152, pp. 383-391.
Nicholls, J.R.; Deakin, M.J.; Rickerby, D. S., 1999, "A comparison between the erosion behavior of thermal spray and electron beam physical vapour deposition thermal barrier coating", Wear, Vol. 233-235, pp. 352-361.
Raghavan, S. et al, 1998, "The effect of grain size, porosity and yttria content on the thermal conductivity of nanocrystalline zirconia", Scripta Materialia, Vol. 39, No 8, pp. 1119-1125.
Raghavan, S. et al, 2001, "Thermal properties of zirconia co-doped with trivalent and pentavalent oxides", Acta Materialia, Vol. 49, No 1, pp. 169-179.
Rätzer-Scheibe, H-J. et al, 2006, "The effect of coating thickness on the thermal conductivity of EB-PVD PYSZ thermal barrier coatings", Surface and Coatings Technology, Vol. 200, pp. 5636-5644.
Schulz, U., 2000, "Phase transformation in EB-PVD yttria partially stabilized zirconia TBCs during annealing", Journal of American Ceramic Society, Vol. 4, No 83, pp. 904-910.
Schulz; et al, 2003, "Some recent trends in research and technology of advanced TBCs", Aerospace Science and Technology, Vol. 7, n. 1, pp. 73-80, 2003.
Stöver, D.; Funke, C., 1999, "Directions of the development of TBCs in energy applications", Journal of Materials Processing Technology, Vol. 92-93, pp. 195-202.
Xu, H.; Goug, S., Deng, L., 1998, "Preparation of thermal barrier coating for gas turbine blades by EB-PVD", Thin Solid Films, Vol. 334, pp. 98-102.
Zhu, D. et al, 2000, "Thermal conductivity of EB-PVD thermal barrier coatings evaluated by a steady-state laser heat flux technique", Ohio: NASA, 18 p. (NASA/TM-2000-210238).

Publication Dates

Publication in this collection
May-Aug 2010

History

Received
19 May 2010
Accepted
14 June 2010

This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

[1] Almeida, D. S. et al, 2006, "EB-PVD TBCs of Zirconia Co-doped with Yttria and Niobia, a Microstructural Investigation", Surface and Coatings Technology, Vol. 200, pp. 2827-2833.

[2] Almeida, D. S. et al, 2007, "Thermal conductivity investigation of zirconia co-doped with yttria and niobia EB-PVD TBCs", Materials Science and Engineering: A, Vol. 443, pp. 60-65.

[3] Bernier, J. S., et al, 2003, "Crystallographic texture of EB-PVD TBCs deposited on stationary flat surfaces in a multiple ingot coating chamber as function of chamber position", Surface and Coatings Technology, Vol. 95-99, pp. 163-164.

[4] Couto, P.; et al, 2003, "Flash method standardization in Brazil for the measurement of solid thermophysical properties", In: Metrologia-2003, Pernambuco. Anais.... Recife, Pernambuco, Brasil, Sociedade Brasileira de Metrologia.

[5] Czek, N. et al, 1999, "Studies of the bond-coat oxidation and phase structure of TBC", Surface and Coatings Technology, Vol. 113, pp. 157-164.

[6] Degiovaninni, A., Lament, M., 1986, "Une nouvelle technique d'identification de la diffusivite thermique pour de methode flash", Revue de Physique Appliquée, Vol. 21, pp. 229-237.

[7] Evans, A. G., He, M. Y., Hutchinson, J. W., 2001, "Mechanics-based scaling laws for the durability of TBC", Progress in Materials Science, Vol. 46, No 3-4, pp. 249-271.

[8] Funatani, K., 2000, "Emerging technology in surface modification of light metal", Surface and Coatings Technology, Vol. 133-134, pp. 264-272.

[9] Goward, G. W., 1998, "Progress in coating for gas turbine airfoils", Surface and Coatings Technology, Vol. 108-109, pp. 73-79.

[10] Guo, H. et al, 2001, "Microstructure investigation on gradient porous TBC prepared by EB-PVD", Scripta Materialia, Vol. 44, No 4, pp. 683-687.

[11] Guo, X.; Wang, Z., 1998, "Effect of niobia on the defect structure of yttria-stabilized zirconia", Journal of the European Ceramic Society, Vol. 18, pp. 237-240.

[12] Hass, D.D., 2001, "Thermal barrier coatings via directed vapor deposition" 281p. Doctorate thesis, University of Virginia, Charlottesville, VA.

[13] Henke, B.L. et al, "Atomic Scatering Facts for the Elements", Atomic Data and Nuclear Data Tables, Vol. 54, No 2, p. 181.

[14] Kim, D. J., 1990, "Effect of Ta₂O₅, Nb₂O₅, and HfO₂ alloying on the transformability of Y₂O₃-stabilized tetragonal ZrO₂", Journal of the American Ceramic Society, Vol. 1, No 73, pp. 115-20.

[15] Kim, D. J., 1990, "Effect of Ta₂O₅, Nb₂O₅, and HfO₂ alloying on the transformability of Y₂O₃-stabilized tetragonal ZrO₂", Journal of the American Ceramic Society, Vol. 1, No 73, pp. 115-20.

[16] Kim, D. J.; Tien, T. Y., 1991, "Phase stability and physical properties of cubic and tetragonal ZrO₂ in the system ZrO₂ - Y₂O₃ - Ta₂O₅", Journal of the American Society, Vol. 12, No 74, pp. 3061-65.

[17] Lee, D. Y.; Kim, D. J.; Cho, D. H., 1998, "Low thermal phase stability and mechanical properties of Y₂O₃ and Nb₂O₅ co-doped tetragonal zirconia polycrystal ceramics", Journal of Materials Science Letters, Vol. 17, pp. 185-187.

[18] Lehmann, H. et al, 2003, "Thermal conductivity and thermal expansion coefficients of the lanthanum rare-earth-element zirconate system", Journal of the American Ceramic Society, Vol. 86, No 8, pp.1138-44.

[19] Mumm, D. R.; Evans, A. G.; Spitsberg, I. T., 2001, "Characterization of a cyclic displacement instability for a TGO in a TBC", Acta Materialia, Vol. 49, No 12, pp. 2329-2340.

[20] Nicholls, J. R. et al, 2002, "Methods to reduce the thermal conductivity of EB-PVD TBCs", Surface and Coatingss Technology, No 151-152, pp. 383-391.

[21] Nicholls, J.R.; Deakin, M.J.; Rickerby, D. S., 1999, "A comparison between the erosion behavior of thermal spray and electron beam physical vapour deposition thermal barrier coating", Wear, Vol. 233-235, pp. 352-361.

[22] Raghavan, S. et al, 1998, "The effect of grain size, porosity and yttria content on the thermal conductivity of nanocrystalline zirconia", Scripta Materialia, Vol. 39, No 8, pp. 1119-1125.

[23] Raghavan, S. et al, 2001, "Thermal properties of zirconia co-doped with trivalent and pentavalent oxides", Acta Materialia, Vol. 49, No 1, pp. 169-179.

[24] Rätzer-Scheibe, H-J. et al, 2006, "The effect of coating thickness on the thermal conductivity of EB-PVD PYSZ thermal barrier coatings", Surface and Coatings Technology, Vol. 200, pp. 5636-5644.

[25] Schulz, U., 2000, "Phase transformation in EB-PVD yttria partially stabilized zirconia TBCs during annealing", Journal of American Ceramic Society, Vol. 4, No 83, pp. 904-910.

[26] Schulz; et al, 2003, "Some recent trends in research and technology of advanced TBCs", Aerospace Science and Technology, Vol. 7, n. 1, pp. 73-80, 2003.

[27] Stöver, D.; Funke, C., 1999, "Directions of the development of TBCs in energy applications", Journal of Materials Processing Technology, Vol. 92-93, pp. 195-202.

[28] Xu, H.; Goug, S., Deng, L., 1998, "Preparation of thermal barrier coating for gas turbine blades by EB-PVD", Thin Solid Films, Vol. 334, pp. 98-102.

[29] Zhu, D. et al, 2000, "Thermal conductivity of EB-PVD thermal barrier coatings evaluated by a steady-state laser heat flux technique", Ohio: NASA, 18 p. (NASA/TM-2000-210238).

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