Paper Titles
Fracture of Ceramics with Near Surface Gradient Residual Stresses
p.97
Instrumented Indentation of Layered Ceramic Materials
p.107
Development of Failure Tolerant Multi-Layer Silicon Nitride Ceramics: Review from Macro to Micro Layered Structures
p.117
Quantitative Assessment of Crack-Tip Stress Field in Semiconductor GaN Using Electrostimulated Piezo-Spectroscopy
p.127
Developments in Processing of Ceramic Top Coats of EB-PVD Thermal Barrier Coatings
p.137
Time-Economic Lifetime Assessment for High Performance Thermal Barrier Coating Systems
p.147
Modelling Failures of Thermal Barrier Coatings
p.155
High Temperature Behavior of Coatings and Layered Ceramics
p.167
Ceramic Layer Composites in Advanced Automotive Engineering and Biomedical Applications
p.177

Developments in Processing of Ceramic Top Coats of EB-PVD Thermal Barrier Coatings

Article Preview

Abstract:

Partially Yttria Stabilized Zirconia (PYSZ) based Thermal Barrier Coatings (TBC) manufactured by EB-PVD process are a crucial part of a system, which protects the turbine blades situated at the high pressure sector of aero engines and stationary gas turbines under severe service conditions. These materials show a high strain tolerance relying on their unique coating morphology, which is represented by weakly bonded columns. The porosity present in ceramic top coats affects the thermal conductivity by reducing the cross sectional area through which the heat flows. The increase in thermal conductivity after heat-treatment relates to the alteration of the shape of the pores rather than the reduction of their surface-area at the cross section. The studies carried out by the authors demonstrate that the variation of the parameters during the EB-PVD processing of PYSZ based top-coats alters the columnar morphology of the coatings. Consequently, these morphological changes affect primarily the thermal conductivity and eventually the Young’ Modulus which are the key physical properties of this material group. New ceramic compositions covering zirconia coatings stabilized with alternative oxides, pyrochlores and hexaluminates are addressed. Failures occurring in ceramic top coats mark the lifetime of TBC system and therefore, it is necessary that their performance should go beyond that of the-state-of-the-art materials. This context summarizes the research and developments devoted to future generation ceramic top coats of EB-PVD TBCs.

You might also be interested in these eBooks
Functional Gradient Ceramics, and Thermal Barriers View Preview

Info:

Periodical:

Key Engineering Materials (Volume 333)

Pages:

137-146

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.333.137

Citation:

Cite this paper

Online since:

March 2007

Authors:

Bilge Saruhan, Uwe Schulz, Marion Bartsch

Keywords:

Electron-Beam Physical Deposition, Thermal Barrier Coating (TBC), Thermal Conductivity (TC)

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] D. D. Hass, A. J. Slifka, and H. N. G. Wadley, Acta Mater., 49, 973-83 (2001).

Google Scholar

[2] J. R. Nicholls, K. J. Lawson, A. Johnstone, and D. S. Rickerby, Surface and Coatings Technology, 151-152, 383-91 (2002).

DOI: 10.1016/s0257-8972(01)01651-6

Google Scholar

[3] K. Fritscher, F. Szücs, U. Schulz, B. Saruhan, W. A. Kaysser, Ceramic Engineering and Science Proceedings, 23 (4) Part B, 341-352 (2002).

Google Scholar

[4] U. Schulz, K. Fritscher, C. Leyens, M. Peters, Ceramic Engineering and Science Proceedings, 12(4) Part B, 347-356 (2001).

Google Scholar

[5] E. R. Andrievskaya, L. M. Lopato, J. of Mater. Sci., Vol. 30 (1995), S. 2591-2596.

Google Scholar

[6] R. Subramanian, U.S. Pat. No. 6 258 467 B1, Jul. (2001).

Google Scholar

[7] M. J. Maloney: U.S. Pat. No. 6 177 200 B1, (2001).

Google Scholar

[8] R. Vaßen, X. Cao, F. Tietz, D. Basu, D. Stöver, Journal of the American Ceramic Society, Vol. 83.

Google Scholar

[8] (2000), S. 2023-(2028).

Google Scholar

[9] R. Gadow and M. Lischka, Surface & Coatings Technology, 151-152 (2002) 392-399.

Google Scholar

[10] U. Schulz, J. Münzer, and U. Kaden, Ceramic Engineering and Science Proceedings, 23 (4), 353-360 (2002).

Google Scholar

[11] U. Schulz, K. Fritscher, C. Leyens, M. Peters, and W. A. Kaysser, Materialwissenschaft und Werkstofftechnik, 28, 370-76 (1997).

DOI: 10.1002/mawe.19970280811

Google Scholar

[12] K. Wada, N. Yamaguchi, and H. Matsubara, Science and Coatings Technology, 191 (2005).

Google Scholar

[13] S.G. Terry, Evolution of microstructure during the growth of thermal barrier coatings by Electron-Beam Physical Vapor Deposition, Materials Department, Dissertation, University of California, Santa Barbara, 2001, p.197.

Google Scholar

[14] D.V. Rigney, et al., U.S. Pat. No. 6 447 854 (2002).

Google Scholar

[15] J.M. Nieuwenhuizen, H.B. Haanstra, Philips Techn. Rev. 27, 87 (1966).

Google Scholar

[16] K. Fritscher, W. Bunk: Density Graded TBCs Processed by EB-PVD, in: FGM 90, ed. M. Yamanouchi, J. Sendai, FGM Forum, 91-96 (1990).

Google Scholar

[17] K.J. Lawson, J.R. Nicholls, D.S. Rickerby: Thermal conductivity and ceramic microstructure, in High temperature surface engineering, ed. D.R.J. Nicholls, D. Allen, The Institute of Materials, London, (1997).

Google Scholar

[18] D.L. Youchison, et al., Surface and Coatings Technology 177-178 (2004) 158-164.

Google Scholar

[19] W. Beele, G. Marijnissen, E. Vergeldt, Nice, Forum of Technology, 1-7, (2002).

Google Scholar

[20] J.R. Nicholls, K. Lawson, A. Johnstone, D. Rickerby, Low Thermal Conductivity EB-PVD TBCs, Materials Science Forum, 369-372 (2001) 595-606.

DOI: 10.4028/www.scientific.net/msf.369-372.595

Google Scholar

[21] U. Schulz, K. Fritscher, M. Peters, 82 (1996) 259-269.

Google Scholar

[22] U. Schulz, K. Fritscher, M. Peters, J. Eng. Gas Turbines and Power 119 (1997) 917-921.

Google Scholar

[23] B.A. Nagaraj, D.J. Wortmann, ASME J. Eng. Gas Turbine Power, 112 (1990) 536.

Google Scholar

[24] U. Schulz, K. Fritscher, C. Leyens, Surface and Coatings Technology, 133-134 40-48 (2000).

DOI: 10.1016/s0257-8972(00)00871-9

Google Scholar

[25] C. Leyens, U. Schulz, K. Fritscher, Materials at High Temperatures, 20 (2003) 475-480.

Google Scholar

[26] U. Schulz, B. Saint-Ramond, O. Lavigne et al., Ceramic Engineering and Science Proceedings, 25(4), (2004) 375-380.

Google Scholar

[27] S. Alperine, V. Arnault, O. Lavigne, R. Mevrel, 2001, U.S. Pat. No. 6333118, EP Pat. No. 1085109.

Google Scholar

[28] J. Singh, et al., Journal of Materials Science, 39 (2004) 1975-(1985).

Google Scholar

[29] K. Matsumoto, Y. Itoh, T. Kameda, Science and Technology of Advanced Materials, 4 (2003) 153.

Google Scholar

[30] M. Maloney, 2001, U.S. Pat. No. 6177200, U.S. Pat. No. 617560.

Google Scholar

[31] R. Subramanian, 2002, U.S. Pats. No. 6258467 and 387539.

Google Scholar

[32] B. Saruhan, P. Francois, K. Fritscher, U. Schulz, Surface and Coatings Technology, 182 (2004) 175-183.

DOI: 10.1016/j.surfcoat.2003.08.068

Google Scholar

[33] B. Saruhan, U. Schulz, R. Vassen et al., Ceramic Engineering and Science Proceedings, (CESP), 25(4), 2004, 363-373.

Google Scholar

[34] D. Wortman, 1999, Multilayer TBC, U.S. Pats. No. 5, 942, 334 and 5792521.

Google Scholar

[35] T. Krell, U. Schulz, M. Peters, W.A. Kaysser, Graded EB-PVD alumina-zirconia thermal barrier coatings- an experimental approach, in: FGM 98, ed. W.A. Kaysser, Trans Tech Publications LTD, 396-401 (1999).

DOI: 10.4028/www.scientific.net/msf.308-311.396

Google Scholar

[36] M. Peters, C. Leyens, U. Schulz, W.A. Kaysser, Advanced Engineering Materials, 3 (2001) 193-204.

Google Scholar

[37] M. Maloney, Method for producing ceramic coatings with layered porosity, U.S. Pat. No. 6365236, (2002).

Google Scholar