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

Twórcy

autor

Singheiser L.

autor

Quadakkers W.J.

autor

Clemens D.

autor

Steinbrech R.W.

• Forschungszentrum Julich GmbH