Also nobody has tried titanium nitride... the yellow stuff they put on cutting
tools to reduce friction and wear. That could be counter productive because
I suspect the friction between the slot and the seal tends to damp chatter.
I still think it is worth a try.

Paul Lamar

Paul, I am not totally sure but I believe that Ti NI might be good in the 
slots but bad on the faces. In most sliding assemblies
one of the elements is always noteably softer. I am not sure this 
is needed on the rotary, but the chrome housing and Ti Ni
might be too closely matched and spall. The ceramic seals should 
be reversed to the normal pattern. They should be harder than
the housing. All the standard metal seals would be softer. Bill Jepson

Maybe that is why tool steel seems to have a real problem as apex seal
material. Seal smoothness is another factor. Ceramic seals are super
smooth.

Paul Lamar

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