question about powder reaction during plasma spray process
03-12-2009, 03:49 AM, (This post was last modified: 03-12-2009, 04:07 AM by greentree.)
question about powder reaction during plasma spray process
Hi,dear friends! I am greentree. I'm a new member of the surface engineering forum.I am a student majored in thermal spray technology.
Recently, I want to fabricate a solid lubricant coating using plasma spray. The powder I want to use is BaF2,CaF2,Ni,Cr,Cr3C2. Some literature said fluoride will react with active metal, but they didn't show the specific reaction process, equation and details.
I really want to know the reaction among them during plasma spary.
If you konw something about it, please tell me. Including the test methods, the reaction equation, some papers on it, etc. I will very appreciated with you. Thank you very much.
My email is
03-12-2009, 08:01 PM,
RE: question about powder reaction during plasma spray process
Hi Greentree

Sign0016 to the Surface Engineering Forum.

If your powder is a simple blend of BaF2,CaF2 and chromium carbide/nickel chromium I would suspect there to be little interaction due to limited time at high temperature and limited physical contact between constituents during spraying. BaF2 and CaF2 are used as flux agent in welding rods/powders so I doubt reactions would be harmful.

This may be of interest, see page 119 fused fluoride coatings and plasma sprayed coatings ASM Handbook
03-13-2009, 02:16 AM, (This post was last modified: 03-13-2009, 02:16 AM by greentree.)
RE: question about powder reaction during plasma spray process
Thank you very much for your response,Gordon!

I couldn't open the link you gived above ,would you please send a copy to my or ?

Also I wondered is that will BaF2 or CaF2 be changed to BaO or CaO in the high temperature?if so, what compound will the elment F be changed to ?
Thanks a lot!
03-13-2009, 05:09 PM,
RE: question about powder reaction during plasma spray process
Hi Greentree

Sorry if the link does not work for you, it works fine for me Question Anybody else have problems with ASM Handbook p119. Sorry, I can not email a copy as it is not easily copied and more importantly because of copyright.

BaF2 or CaF2 i think (not sure) will be resistant to changing to BaO or CaO in normal plasma spraying (not vapourising constituents Happy0193). When used in fluxes, I think there action is to lower melting temperatures of more refractory oxides and acts to absorb and dilute oxides rather than take part as a chemically active constituent.

Possibly Related Threads…
Thread Author Replies Views Last Post
  Question about literature of Thermal Spray m_e_guerra 0 759 10-13-2019, 03:49 AM
Last Post: m_e_guerra
  Helium Alternative for Plasma Spray Abilash 2 1,100 02-18-2019, 03:51 PM
Last Post: Lemster68
  Plasma Spray Masking Tape achmadarifudinh 2 1,117 09-06-2018, 02:48 AM
Last Post: achmadarifudinh
  Sulzer Metco 58NS Copper-Nickel-Indium alloy powder question RaymondF2 1 1,294 09-05-2018, 04:35 PM
Last Post: ServiceTech
  Arc Spray and then Plasma spray? Is this common? cancun555 2 1,568 06-23-2017, 07:11 AM
Last Post: loriolo
  Inert gas shrouded plasma spray MartyMc 1 2,420 06-23-2016, 11:08 PM
Last Post: loriolo
  Rotating Plasma Spray Gun MarkL 2 2,802 06-08-2016, 06:52 AM
Last Post: MarkL
  Poor flame with Ni-based metallic powder - HVOF process Roy 2 2,895 02-26-2016, 12:30 AM
Last Post: Roy
  Metallicity of Plasma spray plzc126330 2 2,508 12-17-2015, 10:34 AM
Last Post: loriolo
  Problem for plasma powder line keane 1 2,514 08-18-2015, 06:45 AM
Last Post: LEN WOOD
  Plasma spray using Kerblack Hector Monjardin 4 3,247 07-30-2015, 05:43 PM
Last Post: loriolo
  Water Plasma Spray System sreenuvundela 0 2,123 03-12-2014, 06:26 AM
Last Post: sreenuvundela
  F4 Gun Process Parameters required for Metco 2043 Powder sreenuvundela 1 3,963 01-16-2014, 11:02 PM
Last Post: loriolo
  Thermal spray coating in Process Industries Chakraborty_P 8 7,840 08-29-2012, 02:43 AM
Last Post: ehasan
  Process Gasses Purity Impact towards Plasma Spray Process, equipment or outcome Alexangel1226 8 9,939 06-12-2012, 02:46 PM
Last Post: Eric Tolliver

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd