Quote:What is the max limitation of build up coating with Powder flame spray (6PII).
This would depend very much on the coating material used. Look at some of the Metco powder technical/data sheets, many will indicate a maximum thickness limitation.
Quote:Can we coat on the buildig up lyers with HVOF 100 - 200 micron?
Possibly, but it would certainly not be my first choice of process to use for undercoat. HVOF or arc would be my first consideration.
Quote:For ex. 1 or 2 mm 316 L or other metal powders with 6P-II and than 100 micron WC Co with HVOF
If I was forced to used the 6P-II I would use something like Metco 444, 447, 448, 449 type composite "self-bonding" "one-step" coatings - relatively high bond strength, high integrity coatings with very high thickness limitation.
I would avoid 316 and most austenitic steels due to poor bond (would require bond coat) and relatively low thickness limitation and high residual stress. High chromium steels - martensitic stainless steels on the other hand are low stress and have high thickness capability, but would also require a separate bond coat.