[eutectic]

Silicon carbide fiber reinforced silicon carbide is also being increasingly used.

[mppm]

In production?

[credit_guy]

I think eutectic is referring to the ceramic matrix composites (CMC) used in the General Electric's engine LEAP. Here's some quotes from [1]:

  > The engine has one CMC component, a turbine shroud lining its hottest zone, so it can operate at up to 2400 F. The CMC needs less cooling air than nickel-based super-alloys and is part of a suite of technologies that contribute to 15 percent fuel savings for LEAP over its predecessor, the CFM 56 engine.

  > GE’s CMC is made of silicon carbide (SiC) ceramic fibers (containing silicon and carbon in equal amounts) coated with a proprietary material containing boron nitride. The coated fibers are shaped into a “preform” that is embedded in SiC containing 10–15 percent silicon.

[1] https://www.ornl.gov/news/ceramic-matrix-composites-take-fli...