Paul Lamar wrote:

I have seen a rotary engine that had ceramic coating on the
rotors. The ceramic came off and destroyed the rotor housings wear
surface.
The rotors are low coef. of expansion iron no less.
Dave Leonard has the engine. Dave can you please take some pictures
of the rotor and the housing in question before you leave?

Iron's CTE is anywhere from 9 to 14 (depends on alloying elements).
Aluminum 2024: 22.68
Aluminum 6061: 24.3
Alumina-based ceramics: ~8
Zirconia-based ceramics: ~10
Silicon nitride & silicon carbide ceramics: ~3

Russell Kent


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