Microstructure and Thermal Diffusivity of Gd2Zr2O7 Powders

Grzegorz Moskal; Aleksandra Rozmysłowska

doi:10.4028/www.scientific.net/AMR.89-91.739

Paper Titles

Microstructural Characterization of Ti6Al4V-SiC_f Composite Produced by New Roll-Bonding Process
p.715

Effect of Austenite Deformation on Recrystallisation Behaviour in an X-70 Microalloyed Steel
p.721

Water-Resistant Poly(Vinyl Alcohol) Hybrid Nanofibers Incorporating Polyhedral Oligosilsesquioxane (POSS)
p.727

Grain Boundary Modification by Si₃N₄ Additions and the Effect on Corrosion Behaviors in Two Sintered Nd-Fe-B Magnets
p.733

Microstructure and Thermal Diffusivity of Gd₂Zr₂O₇ Powders
p.739

The Effects of Friction and Lubrication on Multipass Hot Deformation
p.745

Local Mechanical Characterization of Human Teeth by Instrumented Indentation
p.751

TEM Study and Magnetic Measurements of Nano–Scale Particles Formed in Cu–Base Alloys
p.757

Hydrogen Embrittlement of Submicrocrystalline Ultra-Low Carbon Steel Produced by High-Pressure Torsion Straining
p.763

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 89-91Microstructure and Thermal Diffusivity of Gd2Zr2O7...

Microstructure and Thermal Diffusivity of Gd₂Zr₂O₇ Powders

Abstract:

The selection of new TBC materials is restricted by few basic requirements such as: high melting point, no phase transformation between room and the operation temperatures, low thermal conductivity, chemical inertness to the combustion gases and environment, thermal expansion match with the metallic substrate, good adherence to the metallic substrate and low sintering rate of the porous microstructure. Among these properties, one of the most important is thermal diffusivity. The number of material that can be used as TBCs is limited and so far only a few materials have been found to basically satisfy these requirements. Recent research has shown that certain rare-earth zirconates, such as Gd2Zr2O7, have even lower thermal conductivities than 7YSZ, and this has spurred an intensive research in discovering alternative TBC materials. The results of microstructure tests performed on the powders intended for thermally sprayed TBCs with APS method were presented in this article. The tests of phase and chemical composition of the analysed powder were performed. The carbon, sulphur and gas nitrogen contents were, among other things, determined during those tests. The x-ray powder diffraction phase identification in as received material was determined. The tested material showed the presence of Gd2Zr2O7 compound as the predominant one and Gd2O3 and ZrO2 oxides. The surface morphology analysis of the powder was carried out and its internal structure was characterized. The tested material shows porous structure typical for agglomerated powders. The second testing area applied to analysis of the powder thermal properties. The thermal diffusivity of the compressed samples with density similar to the solid material was determined with the laser flash (LF) method. The measurement results show that requirements for the materials used for new generation TBCs are met.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Advanced Materials Research (Volumes 89-91)

Pages:

739-744

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.89-91.739

Citation:

Cite this paper

Online since:

January 2010

Authors:

Grzegorz Moskal, Aleksandra Rozmysłowska

Keywords:

Conductivity, Pyrochlore, Thermal Barrier Coating (TBC), Thermal Diffusivity, Zirconate

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

References

[1] S. M. Meier, D.K. Gupta: J. Engineering for Gas Turbines and Power, 1994, 116, pp.250-257.

Google Scholar

[2] B. A. Pint, I.G. Wright and W.J. Brindley: J. of Thermal Spray Tech., 9(2), 2000, pp.198-203.

Google Scholar

[3] M. Konter, M. Thumann: J. of Materials Processing Tech., 92-117, 2001, pp.386-390.

Google Scholar

[4] D. Stover, C. Funke: J. of Materials Processing Tech., 92-93, 1999, pp.195-202.

Google Scholar

[6] L. Swadźba, G. Moskal, B. Mendala and T. Gancarczyk: Archives of Mat. Sc. and Eng., Vol. 28, 12, 2007, pp.757-764.

Google Scholar

[7] G. Moskal, L. Swadźba and T. Rzychoń: J. of Achievements in Materials and Manufacturing Engineering, Vol. 22, 2, 2007, pp.31-34.

Google Scholar

[8] L. Swadźba, G. Moskal, B. Mendala and T. Gancarczyk: J. of Achievements in Materials and Manufacturing Engineering, Vol. 21, 2, 2007, pp.81-84.

Google Scholar

[9] W.J. Lackey et al.: Ceram. Mater., Vol. 2, 1 (1987), pp.24-30.

Google Scholar

[10] B.P. Bewley et al.: A review of very high-temperature Nb-silicide based composites, Technical Information Series, GE Research & Development Center, September 2002l, 2002GRC172.

Google Scholar

[11] R. Vassen, D. Stoever: Conventional and new materials for thermal barrier coatings. In Functional Grandient Materials and Surface Layers Prepared by Fine Particles Technology, ed. M. -I. Baraton and I. Uvarova. Kluwer Academic Publishers, Netherlands, pp.199-216.

DOI: 10.1007/978-94-010-0702-3_21

Google Scholar

[12] M. J. Maloney: U.S. Patent No. 6, 117, 560, (2000).

Google Scholar

[13] M. J. Maloney: U.S. Patent No. 6, 117, 560, (2000).

Google Scholar

[14] M. J. Maloney: U.S. Patent No. 6, 284, 323, (2001).

Google Scholar

[15] R. Subramanian: U.S. Patent No. 6, 258, 467, (2001).

Google Scholar