Protective coatings for high temperature applications.

• Autorzy: Singheiser L. , Quadakkers W.J. , Clemens D. , Steinbrech R.W.
• Konferencja: AMT'98 XVth Physical Metallurgy and Materials Science Conference 'Advanced materials & technologies' 17-21 May, 1998, Kraków-Krynica, Poland.
• Języki publikacji: EN

Abstrakty

EN

The improvement of efficiencies of land based gas turbines requires a significant increase of gas inlet temperature. This results in an increased service temperature of the blading materials and consequently to an enhanced oxidation attack of the blade coatings, which are usually of the NiCoCrAlY type. These coatings can act as protection against oxidation/corrosion and as bond coats for zirconia based thermal barrier systems. In both applications slow growth rates and optimum adherence of the alumina scales forming on the NiCoCrAlY coating during high temperature service are of crucial importance for component life. The mentioned technologically relevant properties of the alumina scales not only strongly depend on the coatings base composition but also on the presence of minor and trace elements. In the present paper this will be illustrated by showing as examples the effect of minor changes in yttrium and titanium content on MCrAlY oxidation properties. The coatings were tested by cyclic oxidation in the temperature range 950 degrees centigrade - 1100 degrees centigrade. The effect of the composition variation was studied by characterisation of the bulk coating and the corrosion products using light and electron optical microscopy as well as dilatometry.

Słowa kluczowe

EN

gas turbine; blading; oxidation; oxidation properties; corrosion; electron optical microscopy; dilatometry

PL

turbina gazowa; ułopatkowanie; utlenianie; właściwości utleniające; korozja; mikroskopia elektronowa; badania dylatometryczne

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 1998
• Tom: R. XIX, nr 4
• Strony: 955--962
• Opis fizyczny: Bibliogr. 21 poz., rys.

Twórcy

autor

Singheiser L.

• Forschungszentrum Jülich GmbH, Institute for Materials in Energy Systems (IWE-1), Garmany

autor

Quadakkers W.J.

• Forschungszentrum Jülich GmbH, Institute for Materials in Energy Systems (IWE-1), Garmany

autor

Clemens D.

• Forschungszentrum Jülich GmbH, Institute for Materials in Energy Systems (IWE-1), Garmany

autor

Steinbrech R.W.

• Forschungszentrum Jülich GmbH, Institute for Materials in Energy Systems (IWE-1), Garmany

• Forschungszentrum Julich GmbH

Bibliografia

• [1] W.J. Quadakkers, W. Stamm, N. Czech, D. Clemens and C. Funke, High Temperature Surface Engineering, 23-24 Sept. 1997, Edinburgh Conf. Centre, UK, Proc.
• [2] N. Czech, V. Kolarik, W.J. Quadakkers and W. Stamm, ICMCTF 97, April 1997, San Diego, Proceedings in Surface Engineering, 13 (5) (1997) p. 384
• [3] W. Beele, N. Czech, W.J. Quadakkers and W. Stamm, International conf. on Metallurgical coatings and thin films ICMCTF 97, San Diego, 21-25 April 1997, Proceedings in Surface and Coatings Technology 94/95 (1997) p. 41
• [4] W.J. Quadakkers, W. Stamm, N. Czech, E. Wallura and H. Hoven, EUROMAT ’97, Maastricht, NL, 21-23 April 1997, Proceedings, Edt. L. Sarton, H. Zeedijk, vol.3, p. 209
• [5] J. Quadakkers, H. Holzbrecher, K.G. Briefs, and H. Beske, Oxid. Met. 32, (1989) p. 67
• [6] A.M. Huntz, in ‘The Role of Active Elements in the Oxidation Behaviour of High Temperature Alloys (Ed. E. Lang) Elsevier Applied Science, London, (1989) p. 81
• [7] A Czyrska-Filemonowicz, A. Versaci, D. Clemens and W.J. Quadakkers, Conf. Microscopy of Oxidation, Cambridge, UK, The Institute of Materials, London, (1993) p. 387
• [8] B.A. Pint, Oxid. Met. 45, (1996) p. 1
• [9] L. Singheiser, Habilitation, University of Erlangen, (1991) Germany
• [10] J. Peters and H.J. Grabke, Werkstoffe und Korrosion 35, (1984) p. 385
• [11] S. Taniguchi and T. Shibata, Oxid. Met. 25, (1986) p. 201
• [12] D.R. Sigler, Oxid. Met. 32, (1989) p. 337
• [13] S. Taniguchi and T. Shibata, Transaction of the Japan Institute of Metals 29, (1988) 658 p. 658
• [14] S. Taniguchi and T. Shibata, Oxid. Met. 26, (1986) p. 1
• [15] K. Wambach, J. Peters and H.J. Grabke, Materials Science and Engineering 88, (1987) p. 205
• [16] B. Widyanto, C. Bracho-Troconis and M. Lambertin, Materials Science and Engineering A 120, (1989) p. 207
• [17] J.K.R. Weber and M.G. Hocking, Oxid. Met. 32, (1989) p. 1
• [18] J.M. N’Gandu-Muamba and R. Streiff,, Materials Science and Engineering A 12 1, p. 391
• [19] M.H. Lagrange, A.M. Huntz, and J.H. Davidson, Corr. Sci. 24, 7, (1984) p. 613
• [20] D. Clemens, V.R. Vosberg, H.J. Penkalla, E. Schumann, A. Czyrska-Filemorowi and W.J. Quadakkers, IX Conf. Electron Microscopy of Solids, May 6-9, 1996, Zakopane, Poland, proceedings p. 435
• [21] D. Clemens, V.R. Vosberg, H.J. Penkalla, U. Breuer, W.J. Quadakkers and H. Nickel, Fresenius J Anal Chem (1997) 358, p. 122