HVOF Barrel Life Span
10-13-2012, 09:02 AM,
#1
HVOF Barrel Life Span
Dear Sir,

The life of HVOF Barrel/Nozzle of 6" coming only 3 to 4 Hours only.

The coating material is 75Cr3C2-25NiCr, H.C.Starck make, Particle size ; 45/10 microns

HVOF GUN Make is Flame Spray Technologies

Process Parameters used are
Oxygen Flow is 850 lt/min, Fule flow is 18 lt/hr and Nitrogen Flow is 12 lt/min, Stand off distance is 15"

Kindly suggest how to improve life of the Barrels?


Regards,

SREENIVAS
Reply
10-13-2012, 10:10 AM,
#2
RE: HVOF Barrel Life Span
I try rotating the barrels, that way it wears evenly and I am able to make it last longer.
Other then that I cannot think of a way to make it last longer other them making them out of a harder material like W. Metco sent samples of W lined nozzles.
Reply
10-13-2012, 03:30 PM,
#3
RE: HVOF Barrel Life Span
(10-13-2012, 09:02 AM)sreenuvundela Wrote: Dear Sir,

The life of HVOF Barrel/Nozzle of 6" coming only 3 to 4 Hours only.

The coating material is 75Cr3C2-25NiCr, H.C.Starck make, Particle size ; 45/10 microns

HVOF GUN Make is Flame Spray Technologies

Process Parameters used are
Oxygen Flow is 850 lt/min, Fule flow is 18 lt/hr and Nitrogen Flow is 12 lt/min, Stand off distance is 15"

Kindly suggest how to improve life of the Barrels?


Regards,

Dear sreeniwas,

You may try increase the flow of nitrogen from 12 to 15-18. This may lead to better cooling and lower wear of the barrel

Shantanu


Reply
10-14-2012, 11:10 PM,
#4
RE: HVOF Barrel Life Span
I am assuming this is the same as a jp5000 gun ?

Do you carry out a spot test before coating parts/choosing parameters ?

If your spray spot is oval or in worst case almost like a number 8 then you carrier gas is out of wack. The more round your spray spot is the better, they should last you longer than 3 hours even spraying Wc but as Kschewe mentioned it is good practice to rotate them slightly as they will last that little bit longer.

I've attached an old presentation that might help a bit its a pdf but i think it gives you the idea

All the best

Kev


Attached Files
.pdf   Presentation.pdf (Size: 860.56 KB / Downloads: 1,150)
Reply
11-10-2012, 11:33 AM,
#5
RE: HVOF Barrel Life Span
On which parameter you running the system.Some time more feed rate of powder also worn out the barrel.
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  Loading of Barrel when spraying Inconel 625 Bob Weber 11 10,750 12-31-2014, 08:52 AM
Last Post: Bob Weber
  Life of JP 5000 Gun Parts? RV_DMG 5 8,306 11-14-2014, 03:33 PM
Last Post: hvofhamid
Information Chrome oxide thermal sprayed coatings shelf life Leanne 1 4,652 02-14-2013, 02:18 PM
Last Post: Gordon
  DJ2600 Injector life pakalano 22 25,349 10-19-2012, 03:39 PM
Last Post: pakalano
  parts during life torch hvofhamid 10 12,681 05-29-2012, 06:16 PM
Last Post: Gordon
  Surface preparation and its effect on fatigue life and bond strength WMW 4 9,390 06-29-2010, 08:41 AM
Last Post: drramc
  Dating gun barrel with hardness tester? Possible? larry55 2 7,092 11-06-2009, 05:39 PM
Last Post: larry55
  Jet Kote nozzle life plyer 8 14,158 05-15-2009, 02:30 PM
Last Post: plyer



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd