I apologize Paul..  I didn't read Steve's post carefully enough.  I
think I've got it now.  The "creep" or distortion he's talking about is
strictly on the wear surface, right?

Due to high power operation.

I take that to mean that the wear surface might be getting too hot and
thus becomes weaker, and then the seals chew into it.  Does that sound
right?

If it's heat weakening the base metal, I wonder what's primary factor
driving that.  Combustion gas exposure or friction?  Lack of cooling?
Under oiling?  Mismatch between the side seal material and the surface
coating?  A combination?


Regards,

Matt-

I have no idea. I am waiting to hear from Steve on what he means
when he says creep.

I suspecting the base metal is merely deflecting and not weakening.
The term weakening is not in the lexicon of the mechanical engineering.
The terms are yield... a permanent deformation of the material.
and deflection.... a non permanent deformation.

The bottom line is to duplicate the Mazda test rigs.
Pay particular attention to the plating tester. Chrome on steel
was far and away superior to anything else Mazda tried.

Paul Lamar ...No rotor no motor.

Matt,
I suspect what Steve is saying is that the aluminum is yielding and the
coating is failing ie the substrate is failing to support the surface
coating.
It really doesn't matter why unless your designing a new aluminium.
George ( down under)




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