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Faro
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Turbine Engines: Status Of Material Science

Thu Nov 19, 2009 8:42 am

Beyond GTF, open rotors and contra-rotating stages, what innovations in materials are presently being R&D'ed by turbine engine manufacturers? Which of these innovations can we reasonably expect to see implemented within the next 5 years and which between 5-10 years?

Faro
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oly720man
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RE: Turbine Engines: Status Of Material Science

Thu Nov 19, 2009 10:14 am

Improved high temperature coatings for turbine blades seems to be one that has promise.

http://www.scientificamerican.com/ar...d=thermal-barrier-coating-zirconia
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Faro
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RE: Turbine Engines: Status Of Material Science

Thu Nov 19, 2009 12:38 pm



Quoting Oly720man (Reply 1):
Improved high temperature coatings for turbine blades seems to be one that has promise.

Very interesting development, I wonder when we may see it implemented. Any other technology candidates out there?

I wonder whether materials science has reached a plateau with respect to turbines, it seems that most of future efficiencies will be coming from innovations in mechanics rather than materials. At one point I believe that advances in turbine technology were to a large extent due to advances in materials.

Faro
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tdscanuck
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RE: Turbine Engines: Status Of Material Science

Fri Nov 20, 2009 2:06 am



Quoting Faro (Thread starter):
Beyond GTF, open rotors and contra-rotating stages, what innovations in materials are presently being R&D'ed by turbine engine manufacturers?

In addition to better coatings, they're always playing with the airfoils...3D airfoils are just starting to become the norm and I would suspect they'll keep tweaking that for some time to come.

Blisks are partly manufacturing, partly material, but promise significant weight savings...I'm not sure if they're in the commercial world yet but they're in military engines now.

The easy material advances seem to be behind us...if they can ever get ceramics to play nice, that will be a huge leap though.

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RE: Turbine Engines: Status Of Material Science

Fri Nov 27, 2009 11:40 am



Quoting Tdscanuck (Reply 3):
if they can ever get ceramics to play nice, that will be a huge leap though.

I guess the same would apply for TiAl alloys. Research is still performed on that. If one manages to increase ductility a bit this might open up a new range of applications. The low weight could lead to a significant weight reduction and thus fuel burn.
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jetlife2
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RE: Turbine Engines: Status Of Material Science

Sun Nov 29, 2009 3:50 am



Quoting Tdscanuck (Reply 3):
In addition to better coatings, they're always playing with the airfoils...3D airfoils are just starting to become the norm and I would suspect they'll keep tweaking that for some time to come.

Blisks are partly manufacturing, partly material, but promise significant weight savings...I'm not sure if they're in the commercial world yet but they're in military engines now.

The easy material advances seem to be behind us...if they can ever get ceramics to play nice, that will be a huge leap though.

This is a good list. 1. 3D aero: evident in all the latest fan blades (GE90-115B, GEnx) and continues on the inside, gets better every generation; 2. Blisks: Yes they are in many commercial engines already. The GE90-115B has a first stage compressor blisk as big as some engine's fan stages...GEnx has more stages as blisks. 3. Ceramics: Definitely on the list for the future. Many technology demonstrators have been run and they are in use already in some military engines. Still some hurdles to overcome (cost being one) 4. Materials science in general (metals): the state of the art now is that properties can be predicted from chemistry, thus allowing the alloy to be designed and optimized before making any; (composites) Just getting better and better. Analysis techniques have grown up and now they are not only practical but desirable from all angles: weight, strength, cost. You will see more and more of the engine going this way.

Very good topic, thanks for asking.
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Faro
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RE: Turbine Engines: Status Of Material Science

Sun Nov 29, 2009 9:20 am



Quoting Jetlife2 (Reply 5):
3. Ceramics: Definitely on the list for the future. Many technology demonstrators have been run and they are in use already in some military engines. Still some hurdles to overcome (cost being one)

Very interesting, in use on which operational military engines exactly? In the hot end I presume, but as lining or turbine blade?

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jetlife2
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RE: Turbine Engines: Status Of Material Science

Tue Dec 01, 2009 11:23 pm

This public domain paper from GE Energy is an excellent source. Many of the materials mentioned are used in aircraft applications.

http://www.gepower.com/prod_serv/pro...ech_docs/en/downloads/ger3569g.pdf
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RE: Turbine Engines: Status Of Material Science

Wed Dec 02, 2009 7:59 am



Quoting Faro (Reply 6):
Very interesting, in use on which operational military engines exactly? In the hot end I presume, but as lining or turbine blade?

The EJ200 features ceramics in the HP compressor, aswell as Blisks and other advanced technologies.
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