Posted by Gordon England (62.252.0.12) on 18:33:06 04/04/06
In Reply to: HVOF spray Ti6Al4V posted by Greg Gibbons
Hi Greg
Depends really on nature of the coating you want. I have experience
of arc and plasma spraying this alloy, but not HVOF as yet. Gases
like oxygen, nitrogen and hydrogen do have a significant effect on
coating properties. In arc and plasma spraying only argon and or
helium gases are used to produce ductile low contamination
coatings. Standard spray methods tend to produce coatings with very
good bonding properties, but are hard and somewhat brittle in
nature due to gas absorption and oxidation.
HVOF should produce good dense coatings, but some oxidation and gas
absorption will be difficult to avoid. Argon would probably be a
good alternative to nitrogen as a powder feed carrier gas. If using
the Metco Diamond jet process you could consider using pure
nitrogen instead of air for running the air cap.
Cold gas-dynamic spray or cold spray technology would be advantages
here.
Regards Gordon
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