A gas turbine blade comprising a ceramic thermal barrier coating

The blade body (15) is a Ni- or Co-based superalloy with two different ceramic insulating layers (31, 33) applied to it. The second layer (33) has the following composition, expressed in wt%: (i) 10-95 magnesium aluminate; (ii) 5-90 magnesium oxide; (iii) 0-20 aluminum oxide. The residue comprises n...

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Bibliographische Detailangaben
Hauptverfasser:	FLECK, ROBERT, SCHUMANN, ECKART DR, JANSING, THOMAS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AIR INTAKES FOR JET-PROPULSION PLANTS BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COMBUSTION ENGINES CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINE PLANTS IN GENERAL GAS-TURBINE PLANTS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INDEXING SCHEME FOR ASPECTS RELATING TONON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES ORJET-PROPULSION PLANTS INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES ORMATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHERTHAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04 INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS WEAPONS
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Beschreibung
Zusammenfassung:	The blade body (15) is a Ni- or Co-based superalloy with two different ceramic insulating layers (31, 33) applied to it. The second layer (33) has the following composition, expressed in wt%: (i) 10-95 magnesium aluminate; (ii) 5-90 magnesium oxide; (iii) 0-20 aluminum oxide. The residue comprises normal impurities. Grains (23) of magnesium oxide are embedded in the matrix of spinel-structured magnesium aluminate, having a mean diameter of 0.1-10 mu m. The first layer (31) comprises yttrium oxide (Y2O3) -stabilized zirconium dioxide. The porosity of the layers (31, 32) exceeds 3 vol%. Es wird eine Gasturbinenschaufel (1) mit einer keramischen Wärmedämmschicht (17) vorgestellt, wobei die keramische Wärmedämmschicht (17) aus 10 bis 95 Gew.-% Magnesiumaluminat, 5 bis 90 Gew.-% Magnesiumoxid und 0 bis 20 Gew.-% Aluminiumoxid besteht, wobei Körner aus Magnesiumoxid in eine Matrix aus spinellförmigem Magnesiumaluminat eingebettet sind, wodurch eine besonders gute Anpassung des Wärmeausdehnungskoeffizienten der keramischen Wärmedämmschicht (17) an einen metallischen Grundkörper (15) der Gasturbinenschaufel (1) erreicht wird. Gleichzeitig weist die keramische Wärmedämmschicht (17) eine Porosität größer als 3 Vol.-% auf. Hierdurch wird eine ausreichend niedrige Wärmeleitfähigkeit sichergestellt.