Posted by Dennis Novotny (216.86.71.223) on 21:14:07 29/01/05
In Reply to: Plasma spray Ti6Al4V posted by Papapanos George
At one time, TRW made Titanium intake valves for automobile racing engines using 6 Al 4 V alloy.
The stems were coated with molybdenum sprayed via the oxyacyteline process - in fact it was the same type of wire sprayed moly used to coat the face of piston rings.
The coating had visible porosity and adhered very well when properly applied - there were no scuffing or wear problems to speak of.
It has been a while since the parts were produced by TRW in the USA this way.
I seem to recall that TRW's piston ring division ( at the time) sprayed the moly for TRW's valve division.
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