[darksaints]

I would add that there is a case for ceramic matrix composites in modern gas turbines. And this could also radically alter the ease of manufacturing for solid oxide fuel cells, which in addition to having extremely high combined cycle efficiencies (>80%), can natively use existing hydrocarbon fuel sources, as opposed to just pure hydrogen.

[tus88]

Is this what GE is putting behind the 9X to reduce noise?

[darksaints]

It is used for the turbine blades and combustion chamber, but it has more to do with heat tolerance and weight than noise. I think the biggest part of the noise reduction comes from using a much larger and more efficient fan.