Tungsten Carbide coating
05-25-2010, 10:33 AM,
#1
Tungsten Carbide coating
Hi everyone,
I understand that that WC based coatings is to be used in the environment where the temperature is to be below 500'C. Is it because of decarburization or oxidation which make the coating fails?
2nd, In HVOF process e.g Dj2600 how the decarburization is minimized/eliminated where the powders are fed into combustion chamber which is around 2000'C or more?. Do the combustion melt Cobalt only and what transformation takes place for WC?
By the way practically I get good coating, just want to know what happens and explained theoritically.

Thank you
Reply
05-25-2010, 07:54 PM,
#2
RE: Tungsten Carbide coating
Hi Guna

Quote:I understand that that WC based coatings is to be used in the environment where the temperature is to be below 500'C. Is it because of decarburization or oxidation which make the coating fails?

Yes

Quote:2nd, In HVOF process e.g Dj2600 how the decarburization is minimized/eliminated where the powders are fed into combustion chamber which is around 2000'C or more?. Do the combustion melt Cobalt only and what transformation takes place for WC?

Ideally, the particles are heated just enough to allow splatting on impact (not necessarily melting) and not high enough to cause reaction/alloying between WC and cobalt or oxidation/decarburisation. Fortunately, HVOF's very high velocity limits the particles dwell/heating time dramatically and allows use some control when using suitably sized particles.

details-on-hvof-t-1013.html
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  Request for solution to reduce porosity in HVOF Tungsten Carbide Coatings sreenuvundela 7 10,208 07-22-2020, 08:01 AM
Last Post: Simon Kim
  Tungsten Carbide HVOF Removal PrecisionCarbide 9 10,641 02-24-2020, 11:17 AM
Last Post: Packiaraj Mutharasu
  Chrome-Carbide coating issue DanyGans 11 7,743 10-08-2019, 05:19 PM
Last Post: Lemster68
  remove tungsten coating gito 1 1,474 03-22-2019, 10:12 PM
Last Post: sprayloud
  roller surface high roughness Tungsten carbide coating Ra 0.15-0.3mm zhuminkun 6 3,305 02-08-2019, 04:59 AM
Last Post: Taz
  strange ring shaped grooves in carbide coating DavidH 3 2,410 08-21-2017, 02:01 PM
Last Post: DavidH
  Dark surface after grinding of plasma tungsten carbide coating Lazha 1 2,611 05-31-2017, 12:07 PM
Last Post: loriolo
  HVAF tungsten carbide to replace hard chrome - Help??!!! Adamreis 2 2,940 02-20-2017, 11:04 PM
Last Post: Vig
  Effective Way of Testing hardness of Tungsten Carbide MANGESH 2 5,578 12-03-2015, 09:25 PM
Last Post: alaskangrown
  Tungsten Carbide coatings Sealants sorousheti 5 5,936 11-23-2015, 10:18 AM
Last Post: sorousheti
  Boron Carbide as a Surface Coating TCHP222 0 2,719 11-12-2015, 08:06 PM
Last Post: TCHP222
  Cold Spray with Tungsten Carbide LLBHW 3 11,232 04-24-2015, 01:06 AM
Last Post: Fermit
  HVOF Tungsten Carbide - New Line Setup David 1 3,990 08-16-2014, 03:51 PM
Last Post: Gordon
  Low carbide in WC-Co coating Lazha 3 4,293 08-31-2013, 09:55 AM
Last Post: Lazha
  Tungsten Carbide HVOF Coated Ball Valves grinding and Lapping constraints --- Reg sreenuvundela 4 9,916 07-29-2013, 09:04 AM
Last Post: Met.Eng.



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd