HVOF parameter for WCCo + CoNiCrAlY

[Guna]

Hi Forum members,
I have an air cooled SM HVOF system where we use a blended powder with composition of 50%WC12Co + 50% CiNiCrAlY and the flow meter is set as Propane 41, Oxygen 43 and air 55. Now I'd like to blend the powders by myself using 50% AMDRY 9954 + 50% SM 5812 and would like hear your inputs on how to arrive at the flow meter settings.

Thank you
S.Guna

[Gordon]

Hi Guna

I would spray samples to the exactly the same parameters and then compare coating microstructure, hardness, deposit efficiency etc with previous coatings. If optimisation is then required you will need to do some coating development trials, trying new spraying parameters or powder blending modifications.

[Spraytube]

Hi,

My starting parameters would be:

O² : 10,3 bar 253 l/mn (~40 FMR)
Propane : 6.9 bar 77 l/mn(~40 FMR)
Air : 6.9 bar 376 l/mn (48 FMR)

Carrier : 12.5 l/mn spray rate : 38 g/mn spray distance :9 in

Would be interesting to see the micro structure

regards