(05-21-2019, 04:10 PM)velocity Wrote: Hello
I attached a photo from a sample spray. System is 8830. Wire is Metcoloy 2 without buffer. Sandblasted cleaned without problem. Layer thickness is 2.5 mm. Machined with lathe CBN cutters as 0.5 mm at OD passes, quite gently.
What is reason of that much porosity? How can i solve this problrm? This layer created to spray HVOF on top of it....
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Hi Velocity
in my opinion, try checking the nozzle, what perameter:
amperage, voltage, air pressure, because this parameter is very influential from the results of coating, I have experience, before the top layer of HVOF, I use NiAl as a buffer layer and there is no problem.
Thanks
Gito