Wyniki wyszukiwania - BazTech

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Degradation of the gas turbine blade coating and its influence on the microstructure state of the superalloy

Błachnio J., Kułaszka A., Zasada D.

Journal of KONES

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2015

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Vol. 22, No. 2

17--24

EN

The technical condition of the blades has a critical influence on the reliability and life span of a gas turbine and an engine into which it is built in. The main causes of blade damage are overheating, creeping, thermal fatigue, high temperature corrosion, etc. It is often caused by adverse operational conditions or manufacturing defect, e.g. using insufficiently durable types of heat-resistant protective coatings or applied in an improper manner on the blade material. Reaction of coatings and blade material to mechanical and thermal loads depends mainly on the operating temperature of the turbine. Selection of a protective coating and material to manufacture a blade with an assumed strength must take into account its mechanical and thermal properties at maximum aerofoil temperature. The article presents characteristic forms of operational damages to the gas turbine blades of a turbojet aero engine. Distinguished were operational factors and their influence on the technical condition of coatings during the engine operation period. An influence of excess exhaust gas temperature on the condition of the heat-resistant blade layer was shown. Shown were also results of morphology tests of coating degradation types. Results of micro-structure tests of the blade superalloy after damage to the heat-resistant coating were also presented.

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Zastosowanie drutów proszkowych do łukowego natryskiwania powłok żaroodpornych

Milewski W., Olbrycht A., Pawlik S., Pokhmurska H.

Inżynieria Powierzchni

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2014

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nr 4

23--30

PL

W artykule przedstawiono wyniki natryskiwania łukowego wielowarstwowej powłoki składającej się z międzywarstwy NiAl, war stwy z drutu proszkowego (Fe-Cr) oraz Al. Zbadano żaroodporność powłoki, jej odporność na zużycie oraz przeprowadzono badania metalograficzne. Stwierdzono, że natryskana wielowarstwowa powłoka bardzo dobrze zabezpiecza przed utlenianiem stalowe pod łoże w temp. 550oC i 900oC.

EN

The results of arc spraying of a multilayer coating consisting NiAl in the interlayer, the wire layer of powder (Fe-Cr) and Al. The heat resistance and were resistance of coating were investigated and metallographic examination were carried out. It was found that the injected multi-layer coating well protects metal surfaces from oxidation at 550oC i 900oC.

3

Żaroodporne powłoki typu Fe-Cr-Al natryskiwane łukowo

Milewski W., Olbrycht A., Pawlik S., Borowski T.

Przegląd Spawalnictwa

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2009

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R. 81, nr 9

45-48

PL

W artykule przedstawiono wyniki natryskiwania łukowego wielowarstwowej powłoki składającej się z międzywarstwy NiAl oraz warstwy z drutu proszkowego (Fe-Cr) i warstwy Al. Zbadano żaroodporność powłok oraz przeprowadzono badania metalograficzne. Uzyskaną powłokę poddano dokładnej analizie jakościowej i ilościowej, stosując skaningowy mikroskop wyposażony w spektrometr rentgenowski EDS.

EN

The article presents the results of arc spraying of multi-layer coating composed of NiAl interlayer and powder wire layer (Fe-Cr), with Al layer. Heat resistance of the coatings was checked and metallographic tests were conducted. The obtained coating was subject to thorough qualitative and quantitative analysis with the use of a scanning microscope with an X-ray EDS spectrometer.