oxide cluster in NiCrAl plasma coating
12-11-2012, 04:02 AM, (This post was last modified: 12-11-2012, 06:23 AM by Zhiguo.)
#1
oxide cluster in NiCrAl plasma coating
hello all,

I am suffering from oxide cluster problem in plasma spray NiCr-6%Al coating.
I tried kinds of methodes (decrease heat input, increase powder feed rate, add airjet and so on) to decrease the oxide cluster. But failed each time.
Gun: F4-MB; Powder: Amdry 960; Nozzle: 6mm;
Ar: 35, 40, 55 NLPM; H2: 5, 7, 9NLPM;
Current: 550, 575, 600, 625A;

Sometimes the metallographic result is good on oxide except several big oxide clusters.
I am really puzzled. Is it because the powder? The powder I used has been stored 5 years.
Reply
12-15-2012, 08:22 AM,
#2
RE: oxide cluster in NiCrAl plasma coating
could you send one of its microstructure pictures?
let me know about the percentage of oxide in microstructure,
put the powder on oven and mix again,
what is the distance of spraying?
Reply
12-18-2012, 03:37 AM,
#3
RE: oxide cluster in NiCrAl plasma coating
(12-15-2012, 08:22 AM)Ramin Wrote: could you send one of its microstructure pictures?
let me know about the percentage of oxide in microstructure,
put the powder on oven and mix again,
what is the distance of spraying?
I tried several distance. 130, 140, 160mm.
The powder is always kept in the oven and I also mixed the powder before fill it in the pot.
I am not sure is it because of the powder has been stored for 5 years? so there is some change in the composition?

I tried to insert a imagine but failed. I am not sure is it because the poor internet in the office. I will try it again when i back home.[/php]
Reply
12-19-2012, 06:45 PM,
#4
RE: oxide cluster in NiCrAl plasma coating
Hi Zhiguo

If you have problems uploading your images, email them to me and I will insert them for you.

Is the powder a composite or alloy product?
Reply
12-20-2012, 02:10 PM,
#5
Photo  RE: oxide cluster in NiCrAl plasma coating
[img]http://[/img]
(12-19-2012, 06:45 PM)Gordon Wrote: Hi Zhiguo

If you have problems uploading your images, email them to me and I will insert them for you.

Is the powder a composite or alloy product?

it should be composite.
Reply
09-26-2018, 04:48 PM,
#6
RE: oxide cluster in NiCrAl plasma coating
(12-19-2012, 06:45 PM)Gordon Wrote: Hi Zhiguo

If you have problems uploading your images, email them to me and I will insert them for you.

Is the powder a composite or alloy product?

What is the end results on this topic? I too am having issues with oxide clusters.
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  Cr2O3 chromium oxide spray problems by Plasma anne 9 6,141 08-01-2016, 08:15 PM
Last Post: anne
  Laminar oxide in hvof coating Lazha 2 3,496 02-24-2014, 09:41 PM
Last Post: KevinS
  Chrome Oxide Plasma SG-100 with N2 warx 0 2,799 10-30-2013, 05:54 PM
Last Post: warx
  Oxide stringers in Metco 58NS coating thezombiesprayer 2 4,669 08-13-2012, 09:56 AM
Last Post: thezombiesprayer
  chrome oxide coating failure - 24" dia. steel roll rconnor 3 5,615 07-10-2012, 02:37 PM
Last Post: loriolo
  Aluminum oxide+titanium oxide schumi 11 11,565 04-19-2011, 11:15 PM
Last Post: loriolo
  Coating retention - Molybdenum Oxide Butchless1 1 3,641 11-03-2009, 06:52 PM
Last Post: Gordon
  Chrome Oxide Coating: Free Chrome rayudugirish 2 5,055 10-15-2009, 02:30 AM
Last Post: Gordon
  ZrO2+yttrium oxide TBC Coating Colour joanwang 1 5,788 09-11-2009, 05:24 PM
Last Post: Gordon
Shy Chromium Oxide Coating - Surface Finish Ra values Ian Mc 5 10,737 05-15-2009, 05:17 PM
Last Post: Gordon
  5pII chromium oxide coating ehsan 5 6,432 04-12-2009, 11:15 PM
Last Post: Gordon
  Chrome Oxide Coating Failure M Brecker 6 12,098 03-11-2009, 01:36 PM
Last Post: KevinT
  Oxide and porosity in WC-CoCr coating ycwbycwb 4 10,501 05-10-2008, 02:39 PM
Last Post: Gordon
  plasma sprayed chrome oxide raviswanadha 1 5,838 04-02-2008, 03:35 PM
Last Post: Gordon



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd