Temperature HVOF Process
09-28-2010, 07:31 AM, (This post was last modified: 09-28-2010, 07:32 AM by ir_minja.)
#1
Temperature HVOF Process
Hi Gordon,

When i'm using WC-Co 88% 12% on coated surface by HVOF process, what is allowable maximum temperature on the surface coated before adding another coated layer (to avoid hot stresses)?

And how about other alloys that can be coat by HVOF, i.e:

1. Hastelloy C
2. Stellite 6
3. Stellite 1
4. Colmonoy 6
5. WC-Co-Cr
6. SS 316

Regards,
~Minja
Reply
09-29-2010, 12:30 PM, (This post was last modified: 09-29-2010, 12:44 PM by Met.Eng..)
#2
RE: Temperature
Hi Minja

more than approximately 205 degrees celsius heat is not required.

The temperature during spraying should not exceed 205 C "Product Process Suport 2005 METCO"

On the other hand, Coating thickness is difficult to keep under control with increasing temperature. I think that such an operation can be done in accordance with the material properties.
Reply
10-04-2010, 08:23 AM,
#3
RE: Temperature
Hi Minja

As Metallurgy_eng said ~ 200C is generally the maximum recommended coating/part temperature during spraying for ferrous type substrates. So you need to get some idea of the temperature rise caused by a pass of the gun to know the safe surface temperature in which to continue spraying.

'To avoid hot stresses' I think it is more important to think about deposit thickness per pass. Aim to build-up coating in very thin layers (ideally around 0.0002" or 5 um), this will help in controlling distribution of heat. Ideally, try and set-up process so that spraying is continuous and that part/coating temperature remains fairly constant through out. I know, easier said then done Happy0193, but that should be your goal.
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  interpass temperature macleod-s 1 2,034 08-11-2019, 04:15 PM
Last Post: velocity
  surface speed for HVOF coating process gito 8 5,548 05-03-2019, 01:08 PM
Last Post: Lemster68
  Poor flame with Ni-based metallic powder - HVOF process Roy 2 4,592 02-26-2016, 12:30 AM
Last Post: Roy
Question High-temperature polymers (PEEK) spraying by HVOF Stanislav 0 3,817 02-19-2016, 11:53 AM
Last Post: Stanislav
  5220 Gun Temperature RV_DMG 6 6,392 11-17-2015, 12:45 PM
Last Post: Joris Kraak
  Heat treatment after HVOF process to decrease porosity Giroud 3 6,228 07-13-2015, 05:51 AM
Last Post: aerotherm
  Process Gasses Purity Impact towards Plasma Spray Process, equipment or outcome Alexangel1226 8 12,284 06-12-2012, 02:46 PM
Last Post: Eric Tolliver
  Temperature control in spraying HVOF minh_8888 1 4,855 06-21-2011, 02:40 PM
Last Post: Met.Eng.
  least powder amount used in HVOF process hustzc 1 4,040 06-23-2010, 12:35 PM
Last Post: Gordon
Question loss on nickel during hvof process twortham 1 4,226 09-16-2009, 03:19 PM
Last Post: Gordon
  flame temperature nile 6 11,023 07-28-2007, 03:13 AM
Last Post: Gordon



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd