Today I took the time and directly asked an expert who works in the turbine engine design team at TEI.
First of all let me announce here that the Turkish single crystal superalloy is a second-generation SX superalloy. The chemical properties of the alloy are obviously secret but according to him, it is at a sweet spot where mechanical, thermal, and production costs are optimized. Everyone is happy with how the SX blades perform. There are no huge gains between the second and third-generation SX blades real gains come from cooling optimizations and thermal barriers. In that sense, according to him, our current SX technology is good enough up to 2000 K depending on
1)Cooling solutions (holes/canals and how you place and optimize them)
2)Thermal barriers (multiple barriers will be used for an advanced engine, chemical and mechanical (like thickness etc) properties of all of them will be secret)
3)Design of the engine (how good is your compressor, how much cooling air can you divert from the compressor to cooling holes/canals in SX blades, a single-piece compressor is a huge bonus in that regard)
Blades of the TS-1400 are designed to operate at 1350-1400 degrees celsius and therefore have a minimum amount of processes that can enable them to work in that temperature range. A small cooling canal and ceramic thermal barrier. The same SX blades CAN EASILY BE USED FOR THE ENGINE OF TFX WITH MORE SOPHISTICATED COOLING SOLUTIONS AND THERMAL BARRIERS.
Turkiye won't be developing a third-generation single crystal technology for the TFX engine and will be switching to CMC composite blades in the (far) future. The studies are concentrated on cooling holes/canals, advanced thermal barriers, and advanced production processes like additive manufacturing.
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