Composite turbine blade for high-temperature applications

Abstract

Composite turbine blade (10) for high-temperature applications such as gas turbines or the like having a root (1) for mounting said blade (10) in a corresponding circumferential assembly groove of a rotor and an airfoil (2) connected to said root (1), whereby an inner carrying structure (3) is provided extending at least over a portion of said root (1) as well as at least a portion of said airfoil (2), whereby said inner carrying structure (3) is made of a high strength eutectic ceramic and said airfoil (2) is made of a ceramic matrix composite (CMC) material.

Description

technical field [0001] The present invention relates to composite turbine blades for high temperature applications such as gas turbines or turbine engines, adapted to be mounted and assembled on rotors or disks of the turbine or engine in order to provide different turbine stages, especially in the hot gas path. Background technique [0002] To increase the efficiency and performance of gas turbine engines, for example, turbines that can operate at higher temperatures than conventional gas turbines are required. In order to meet these operating requirements, so-called superalloys, such as nickel-based superalloys, have been proposed in the past for manufacturing turbine blades. However, these materials are prone to corrosion and are limited to a certain high temperature range. Furthermore, in the prior art, different methods have been proposed for cooling high temperature turbine blades with eg a supply of cooling air. However, as the temperature increases, the amount of c...

AI Technical Summary

Problems solved by technology

[0005] However, these known turbine blades for high-temperature applications have the disadvantage that they require separate cooling means, such as cooling ducts, or do not achieve the required mechanical properties, especially resistance in some parts or positions of such turbine blades High strength for increased loads

Another problem with known turbine blades made of ceramic material is that they are characterized by a rather low resistance to foreign body damage

Furthermore, the eutectic ceramic materials described above have a low fracture toughness, so that the application of such ceramic materials to realize turbine blades and in particular airfoils of such blades is considerably restricted

Images