초록

Disclosed is a gas turbine blade, in which a ceramic covering, which is mechanically fastened to a metal platform, is arranged in a manner that the metal platform is protected against a hot gas in a hot gas duct of a gas turbine.

대표청구항 ▼

1. A gas turbine blade, comprising: a blade aerofoil; and a platform region, adjacent to the blade aerofoil, bounding a hot gas duct of a gas turbine in which the gas turbine blade is installable, wherein the platform region includes a platform on which a ceramic covering is supported and faste

1. A gas turbine blade, comprising: a blade aerofoil; and a platform region, adjacent to the blade aerofoil, bounding a hot gas duct of a gas turbine in which the gas turbine blade is installable, wherein the platform region includes a platform on which a ceramic covering is supported and fastened by way of a mechanical fastening element. 2. The gas turbine blade as claimed in claim 1, wherein the ceramic covering includes two halves. 3. The gas turbine blade as claimed in claim 2, wherein a first half of the halves is adjacent to a suction surface of the blade aerofoil, and the other half is adjacent to a pressure surface of the blade aerofoil. 4. The gas turbine blade as claimed in claim 1, wherein the mechanical fastening element is a spring being firmly connected to the gas turbine blade. 5. The gas turbine blade as claimed in claim 4, wherein the spring engages in a groove of the ceramic covering, where the groove extends along a narrow side adjacent to the blade aerofoil. 6. The gas turbine blade as claimed in claim 1, wherein a fixing pedestal is arranged on the metal platform, the pedestal being engaged with the ceramic covering. 7. The gas turbine blade as claimed in claim 1, wherein the gas turbine blade is configured as a guide vane with a second platform region opposite to the platform region enclosing the blade aerofoil, whereby the second platform region has a second platform, on which a second ceramic covering is supported and fastened by way of a second mechanical fastening element. 8. The gas turbine blade as claimed in claim 7, wherein the platforms are made of metal. 9. The gas turbine blade as claimed in claim 1, wherein the ceramic covering has an integral mat, by way of which fragments are held as a composite in the event of a fracture of the ceramic covering. 10. The gas turbine blade as claimed in claim 1, wherein the ceramic covering includes mullite. 11. The gas turbine blade as claimed in claim 10, wherein the ceramic covering has an outer sealing layer to combat particle separation. 12. A gas turbine having a gas turbine blade as claimed in claim 1. 13. The gas turbine as claimed in claim 12, wherein the gas turbine blade is arranged, in an axial direction of a hot gas duct, between two rotor blades, and a second ceramic covering extends in the axial direction in such a manner that the rotor blade fails to come into contact therewith. 14. The gas turbine blade as claimed in claim 1, wherein the platform is made of metal. 15. The gas turbine blade as claimed in claim 14, wherein a fixing pedestal is arranged on the metal platform, the pedestal being engaged with the ceramic covering. 16. A blade ring including a least one gas turbine blade as claimed in claim 1. 17. A blade ring including at least two gas turbine blades as claimed in claim 1, where the ceramic covering of the at least two gas turbine blades is joined together. 18. The gas turbine blade of claim 1, comprising a second platform region, adjacent to the blade aerofoil, including a second ceramic covering. 19. The gas turbine blade of claim 18, wherein each of the ceramic coverings include two halves. 20. The gas turbine blade as claimed in claim 19, wherein a first half of the halves is adjacent to a suction surface of the blade aerofoil, and the other half is adjacent to a pressure surface of the blade aerofoil.