Jet Engine: Turbine Blades and Temperature

In summary, the conversation discussed the environmental conditions a turbine blade in a Jet Engine would have to withstand, and the materials necessary to prevent failure. The temperature in the combustion chamber can reach up to 2000 degrees, and the blades are typically made of ceramics or alloys. Other environmental factors to consider include changes in pressure and the high speeds the blades move at. The properties a material would need to possess include stiffness, yield stress, plasticity, elastic strain, and breaking stress. Some materials mentioned as candidates for turbine blades include Inconel 718, Inconel 738, CMSX4, and Hastelloy. The design and balance of the turbine are also important factors to consider in preventing stress cracks and maintaining subsonic
  • #36
Astronuc said:
Rockets usually used gimbled rocket motors or small rocket motor to 'steer' the rocket. Control surfaces on aircraft and some rockets are made of the lighest possible material and usually do not operate at high temperature - except for those vehicles traveling well beyond supersonic. By contrast turbine blades in a jet engine operated at very high temperatures.

There is a great deal of 'art' in perfecting an alloy composition that retains high strength, toughness and creep resistance at high temperature.


China and India are not backward countries. They have considerable expertise in many high tech areas.

Thanks for the reply.
However I am pretty sure that apart from gimbled engines, "jet vanes" too are used for steering. Some times graphite and sometimes graphite reinforced ceramic composite jet vanes are used.
If you google the phrase "graphite reinforced ceramic composite jet vanes" you will find a blog which is about proliferation control. Over there they talk about advanced composite material jet vanes which are used to steer rockets.
The blog is contributed to by rocket scientists so it is fairly reliable in terms of technical information as far as rockets go.
So I am sure that jet vanes are used for steering rockets and I was just wondering if the technology for making such composite material is related to the technology of making turbine blades?
If there is any similarity in between, would the technical know-how as to make one imply the ability to make the other? or are they completely unrelated to each other?
 
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  • #37
To Astronuc:

By the way the graphite reinforced ceramic which is used for making jet vanes (in general ANY materials used for making jet vanes for the purpose of steering the rockets) has to be able to withstand EXTREME temperatures and very harsh environment.
 
  • #38
Look up the German V-2. It used graphite vanes for thrust vectoring. It has to have been reused since then.

The black shapes in the attached picture are the vanes:
infopic05.jpg
 

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