RE: what is the thinkness of the each HFVO
a "good" aero-spec WC-Co-Cr for example will be happiest applied around 0.0002" per pass, regardless of being onto a fixed part (ladder) or a rotating part. Speeds of control should be tailored to the specific part (RPM, step per revolution etc.).
That would be with a gas-fueled HVOF system. Currently, liquid-fueled HVOF systems are not approved for Aero coatings as far as I am aware. The best chance would probably be something like the WokaStar running ethanol, which is capable of aero-quality coatings (but was never submitted for approval by an OEM).
Metals applied with gas fuel, can run as high as 0.0005 per pass easily, and if the allowance for porosity is there, perhaps even higher per pass.
Large commercial parts are well served with liquid-fuel (JP-5000 and it's competitors) like the WokaJet, CarbideJet etc.) where the deposit rates can be much higher, but quality will not be the same (and usually not required) as compared to gas-fuel Aero coatings.
Spraying since '87. University of Metco alum (99-16)
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