Low carbide in WC-Co coating
08-20-2013, 06:13 AM, (This post was last modified: 08-20-2013, 06:16 AM by Lazha.)
#1
Low carbide in WC-Co coating
Dear all,

I have been spraying this Diamalloy 2004 on DJM2600 HVOF gun for several years, using the recipe that was developed some time ago. Recently, the carbide content in my coating seems to be lost. Where you can see layering in the micrograph- consisently. It was dense in the past with minimal layers.
To trouble shoot the process we:
1. Change the whole spare parts in the gun. To the extent of having a new gun mounted on!
2. Change the parts in the hopper.
3. Have a 3rd party to prep my samples to eliminate the possibility of lab preparation error.
4. HVOF system was calibrated just recently. 1 month ago tops! Report is saying everything is in optimal condidtion.

Anyone had this issue before? How did you guys resolve the issue?


I want to upload the micrograph for everyone's review. But how do i upload the pic???
Reply
08-20-2013, 01:10 PM,
#2
RE: Low carbide in WC-Co coating
Hi Lazha

If you are experiencing problems uploading an image, please email image to me and I will insert it into your post for you.

Have you tried different batches of powder to rule out a powder problem?
Reply
08-23-2013, 02:45 AM,
#3
RE: Low carbide in WC-Co coating
This is very, very interesting. I've been having trouble with a couple of lots of 72F-NS as well - hardness issues.

Try a different manufacturer's powder of the equivalent spec. It's very difficult to solution carbide with a DJ gun. I suspect powder material issues. Let us know how it works out
Reply
08-31-2013, 09:55 AM,
#4
RE: Low carbide in WC-Co coating
(08-20-2013, 01:10 PM)Gordon Wrote: Hi Lazha

If you are experiencing problems uploading an image, please email image to me and I will insert it into your post for you.

Have you tried different batches of powder to rule out a powder problem?

Yes. I tried 4 different powder batches. And even got some people with similar system to spray the powder. All looks good.
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  Chrome-Carbide coating issue DanyGans 11 10,367 10-08-2019, 05:19 PM
Last Post: Lemster68
  roller surface high roughness Tungsten carbide coating Ra 0.15-0.3mm zhuminkun 6 5,067 02-08-2019, 04:59 AM
Last Post: Taz
  strange ring shaped grooves in carbide coating DavidH 3 3,425 08-21-2017, 02:01 PM
Last Post: DavidH
  Dark surface after grinding of plasma tungsten carbide coating Lazha 1 3,735 05-31-2017, 12:07 PM
Last Post: loriolo
  Boron Carbide as a Surface Coating TCHP222 0 3,743 11-12-2015, 08:06 PM
Last Post: TCHP222
  Blistering problem in Chromium Carbide Coating -- Reg sreenuvundela 4 7,596 04-28-2013, 07:14 PM
Last Post: shantanu
  Chrome Carbide & T800 Coating Property Change after heat treatment Alexangel1226 5 14,684 09-30-2010, 03:04 AM
Last Post: arjfaye06
  Tungsten Carbide coating Guna 1 6,553 05-25-2010, 07:54 PM
Last Post: Gordon
  Tungsten carbide coating problem ycwbycwb 8 16,074 05-20-2008, 01:42 PM
Last Post: ycwbycwb
  tungstun carbide coating using sulzer metco 9mb gun raviswanadha 9 16,862 11-02-2007, 11:39 PM
Last Post: bhellman



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd