Paul, I am sure that a cromium nitride would be very hard. Probably off the rocwell "c" scale. I
have seen coatings having diamond hard ratings, usually oxide based. I am not a chemist, but I can
show the formula to one of our guys that is.
The "detonation gun". are you familar with the process? The system I have seen uses a compounded
wire that a huge current and voltage is forced through. The energy level causes the wire to
literally explode imbedding the material in the surface. Kawasaki called this process
Electrofusion.The process works much better in a enclosed bore, (like a cylinder bore), since the
material not facing a flat surface is wasted. It doesn't sound like plasma spraying since this is
a well known process. I would love to find out if one of our machines could provide an adaquate
coating!  Bill Jepson

Mazda did a lot of research. I would just copy them. You can download SAE 920309
in pdf form... the Leman engine paper from www.thecarricos.com/ACRE/

Paul Lamar
 
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