Poor flame with Ni-based metallic powder - HVOF process
02-23-2016, 06:47 AM, (This post was last modified: 02-23-2016, 06:52 AM by Roy.)
#1
Poor flame with Ni-based metallic powder - HVOF process

Hello, everyone.

I would like to hear your kind advice on the check points for solving poor flame of HVOF spray gun.

I operates HVOF gun that uses LPG as fuel.
When I tried to spray Ni-based metallic powder(Colmonoy 63HV, Particle size -63/20 um), it seemed powder feed rate was insufficient.
Please see the inserted photo.
When I checked feed rate, it was good - 45g/min.

I adjusted oxy/fuel ratio to increase flame temperature, but there was no change. After trying WC(-45/+15 um) or Co-based metallic powder(-53/20 um), I found out that only Col 63HV had a poor flame problem. I think that the powder quality is okay.

How could I get the proper flame with this metallic powder?
Please advise me as to the check points or hints for trouble shooting.

Yours truly,[Image: 220635673054]


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Reply
02-25-2016, 06:34 PM,
#2
RE: Poor flame with Ni-based metallic powder - HVOF process
Hi Roy,
Powder JK 576 (Stellite 6, -53+10 microns) has quite a lot of fine fraction (< 20 microns), which be hot in the flame. For this reason, the flame be lighter and powder application be greater than in colmonoy 63HV, without any share of fraction < 20 microns. The powder colmonoy 63HV, Particle size -63/20 is simply too coarse for your HVOF system.
Reply
02-26-2016, 12:30 AM,
#3
RE: Poor flame with Ni-based metallic powder - HVOF process
(02-25-2016, 06:34 PM)Vadim Verlotski Wrote: Hi Roy,
Powder JK 576 (Stellite 6, -53+10 microns) has quite a lot of fine fraction (< 20 microns), which be hot in the flame. For this reason, the flame be lighter and powder application be greater than in colmonoy 63HV, without any share of fraction < 20 microns. The powder colmonoy 63HV, Particle size -63/20 is simply too coarse for your HVOF system.

Hi Vadim,

Thank you for your kind advice~
Reply




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