Influence of Impurities on the High-Temperature Water-Vapour Corrosion of Environmental Barrier Rare-Earth Silicates

Abstract:

Article Preview

Corrosion experiments on a number of rare earth di-silicates containing Y, Yb and Lu have been conducted in flowing air with 30 vol.% H2O at 1500°C. Nominally the corrosion rate is slower by a factor 5 to 10 compared to silica. However, alumina impurity incorporation has a profound influence on the process of corrosion as it masks not only the gravimetric results but also changes the surface phase assemblages to contain rare earth garnets and liquid phases. It is presumed that silica loss occurs under those conditions via the liquid phase and does not necessarily follow the same kinetics as direct silicate corrosion. Furthermore, atmospheric silicon hydroxide saturation effects contribute to the corrosion process. Currently all determined corrosion rates of rare earth silicates are viewed as system specific only.

Info:

Periodical:

Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong

Pages:

1780-1783

DOI:

10.4028/www.scientific.net/KEM.336-338.1780

Citation:

N. Maier et al., "Influence of Impurities on the High-Temperature Water-Vapour Corrosion of Environmental Barrier Rare-Earth Silicates", Key Engineering Materials, Vols. 336-338, pp. 1780-1783, 2007

Online since:

April 2007

Export:

Price:

$35.00

[1] O. Fabrichnaya, H. J. Seifert, R. Weiland, et al.: Z. Metallkd. Vol. 92 (2001), p.1083.

[2] E. J. Opila: J. Am. Ceram. Soc. Vol. 77 (1994), p.730.

[3] E. J. Opila: J. Am. Ceram. Soc. Vol. 86 (2003), p.1238.

[4] K. N. Lee, N. S. Jacobson, and R. A. Miller: Bull. Mater. Res. Soc. Vol. 19 (1994), p.35.

[5] K. N. Lee, D. S. Fox, J. I. Eldridge, et al.: J. Am. Ceram. Soc. Vol. 86 (2003), p.1299.

[6] K. N. Lee, D. S. Fox, and N. P. Bansal: J. Europ. Ceram. Soc. Vol. 25 (2005), p.1705.

[7] S. Ueno, N. Kondo, D. D. Jayaseelan, et al.: in ASME TURBO EXPO 2003, 2003), p.1.

[8] S. Ueno, D. D. Jayaseelan, T. Ohji, et al.: J. Ceram. Proc. Res. Vol. 4 (2003), p.214.

[9] S. Ueno, D. D. Jayaseelan, T. Ohji, et al.: J. Ceram. Proc. Res. Vol. 5 (2004), p.153.

[10] H. Klemm, M. Fritsch, and B. Schenk: in Ceramic Engineering and Science Proceedings, edited by E. Lara-Curzio and M. J. Readey (American Ceramic Society, Westerville OH, 2004), Vol. 25.

[11] I. Yuri and T. Hisamatsu: in ASME TURBO EXPO 2003, Atlanta, Georgia, USA, 2003), Vol. GT2003-38886, p.1.

[12] I. Yuri, T. Hisamatsu, S. Ueno, et al.: in ASME Turbo Expo 2004, Vienna, Austria, 2004), Vol. GT2004-54277, p.6.

[13] S. Guo, N. Hirosaki, T. Nishimura, et al.: Phil. Mag. A Vol. 82 (2002), p.3027.

[14] K. Biswas, G. Rixecker, and F. Aldinger: J. Europ. Ceram. Soc. Vol. 23 (2003), p.1099.

[15] N. Maier, Synthese von Seltenerd-Sisilikaten und deren Korrosionsverhalten an strömender feuchter Atmosphäre, Diploma Thesis (University Tuebingen, Tuebingen, 2005), Applied Mineralogy, p.257.

[16] E. J. Opila and D. L. Myers: J. Am. Ceram. Soc. Vol. 87 (2004), p.1701.

[17] I. A. Bondar and F. Y. Galakhov: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl. ) Vol. 7 (1964), p.1231.

In order to see related information, you need to Login.