Diamond Jet Air Flow

[Hunter85]

I am new to running a DJ2600 system. Can you tell me if there are any published works discussing the effects of increasing / decreasing the Air flow in this Gun. All of the parameters that I see have the Air flow at 44% to 50%.

Thanks for your help.

[Gordon]

Hi Hunter85

to the Surface Engineering Forum.

Not been able to find much on this topic. Nearly all publish parameter optimisation work I've come across tends to concentrate on fuel/oxygen flows/ratios, spray distance and spray rates as the variable factors. Air flow for some reason is usually set as a constant from recommended parameters. Air flow is a critical parameter, apart from providing cooling to the air cap, it will influence gas/particle velocity/temperature. It will also influence any tendency for air cap fouling.

[alberto]

I have that problem nowdays,
I am trying to spray Diamlloy 4004NS (Ni 14%Cr 18%Fe 9,5%Co 5%Ti 4%Mo 4%W 3%Al )

My parameters:
H2 (metco flow unit): 60
O2 (metco flow unit): 29
H2/ ( O2+ air*0,2) : 1,76
Air (metco flow unit): 25
N2-carrier (metco flow unit): 25
SD : 310 mm

I began to reach suitable microstructure with these parameters..
However; I have a build up problem on air cap at each 10 passes most probabaly less air flow as sroud gas..
Can I get the same microstructure, İf I increase air flow and decrease O2 flow prowiding that h2/ o2 is constant to prevent air cap fouling..


Regards;