Generatively produced turbine blade and device and method for producing same

Abstract

The present invention relates to a method for producing gas turbine components, in particular aircraft turbine components, preferably low-pressure turbine blades, from a powder which is sintered selectively in layers by locally limited introduction of radiant energy, wherein the sintering is carried out in a closed first housing (2), so that a defined atmosphere can be set, wherein the powder or at least a part of the powder is generated in the same first housing (2) or in a second housing connected to the first housing in a gas-tight manner. The invention further relates to a corresponding apparatus and to a gas turbine blade produced thereby.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for producing gas turbine components, in particular aircraft turbine components, preferably low-pressure turbine blades made of a powder which is sintered selectively in layers by locally limited introduction of radiant energy. In addition, the invention relates to an apparatus for producing gas turbine components, in particular according to a corresponding method, and also to a gas turbine blade produced thereby, in particular low-pressure turbine blades made of a TiAl material.[0003]2. Prior Art[0004]What are known as rapid prototyping—or rapid manufacturing—methods, i.e. methods for rapidly producing prototypes or for rapidly producing components, which utilize so-called generative production methods are known from the prior art. In these methods, three-dimensional structures are produced by selectively sintering powder, for example by means of laser or electron beams which a...

AI Technical Summary

Benefits of technology

The present invention provides a method for producing gas turbine components, particularly low-pressure turbine blades, using a generative production method. The method ensures that the starting powder used in the generative production method has an appropriate purity by avoiding exposure to unfavorable ambient atmosphere. This results in components with a consistent purity and a fine-grained microstructure with low impurities, particularly oxygen content. The method also allows for the production of components with different alloy compositions and grain size distributions, and avoids segregation. The use of different alloyed powder or powder set differently in terms of powder size in different regions in the component can also be provided. The method is economical and efficient, and allows for the production of components with complex cavity structures.

Problems solved by technology

However, the methods and apparatuses described therein have various disadvantages.

By way of example, not all the components can be produced from all possible materials, because the nature of the generative production can introduce impurities, which lead to an unfavorable property profile that is unacceptable for the intended use.

Particularly in the case of titanium aluminide materials which are to be used, for example, for low-pressure turbine blades in aircraft engines, impurities can lead to instances of embrittlement, which make a use in aircraft turbine construction impossible.

In the worst case, the risk of the introduction of impurities correspondingly impedes or prevents a possible use of generative production methods in the production of turbine blades made of titanium aluminides or alloys thereof.

Particularly in generative production methods, long processing times can have the effect that these can no longer be used economically.

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