One method for increasing the efficiency of gas turbine engines is to operate them at higher temperatures than presently used. For this to occur the walls of the combustion chamber will require protection against these high temperatures. Currently one such method for protecting the walls is the use of plasma sprayed coatings. State-of-the-art plasma sprayed coatings, such as zirconia, offer protection to metallic substrates to 1300◦C.
For further improvements in the efficiency of these engines an alternative thermal protection system is required. One such system is the use of ceramic liners, which are attached to either a metallic or for further improvement in temperature capability a ceramic matrix composite support. Such a system would offer the following advantages:
- Increased operating temperature, in excess of 1600◦C
- Low thermal conductivity, <0.1 W/m.K
- Thickness of the ceramic liner can be tailored for end-user requirements.
TWI are currently active in the production of ceramic based "thermal management systems"; this includes the production of a ceramic based liner and suitable joining methodology.
For information about TWI's capabilities please contact us.