developing argon shrouded plasma spray
10-06-2006, 12:51 PM,
#1
developing argon shrouded plasma spray
Hi guys,
I'm new to the forum so please be gentle!!
I have an F4MB plasma spray gun that i now wish to attempt spraying 'argon shrouded'... I plan to make my own argon shroud, but wonder if anyone has ever tried this on an F4MB before. Any info would be great as i realise developing could take some time.

Thanks
Phil (newbee)
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10-07-2006, 07:43 PM,
#2
RE: developing argon shrouded plasma spray
Hi Phil

Welcome to the Surface Engineering Forum.

Been a while since using shrouds and then on Metco 7/9MBs. I believe the shroud was combined with the powder port clamp for means of attachment. I think you will probably have to do the same sort of thing with the F4.

Used nitrogen as shroud gas for most spraying as it was a lot cheaper. Spraying titanium though, is best done with argon.
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10-09-2006, 08:01 AM,
#3
RE: developing argon shrouded plasma spray
Thanks a lot Gordon,
It seems everyone who has ever sprayed using a shroud has made it themselves, although i believe one of sulzers diamond jet guns comes with a nitrogen shroud. As you said, the powder port clamp seems to be where to start...
To get a head start does anyone have answers to the following:

1. if i push argon into the plasma from the powder port clamp, should it go in to the flame before, after or at the same place as the powder?

2. does the angle you put the argon in matter e.g. 90 degrees same as the powder or shallower?

3. are there any books you guys could recommended that have these answers and the answers to all lifes questions!!!

Thanks again,
Phil
Reply
10-09-2006, 01:54 PM,
#4
RE: developing argon shrouded plasma spray
Hi Phil

I think the argon/nitrogen gas entering the shroud should not directly impinge on the plasma or spray stream (parallel to plasma probably best). The ideas being that you supply just enough gas flow to stop air entering the shroud at the exit point. The length of your shroud will also be a factor in providing inert spray conditions. The longer it extends towards your substrate surface the better. Problem is not all substrate geometry and spray distances are the same, so I would think along the lines of making the shroud telescopic so that it is adjustable in length. Also remember these shrouds will tend to get very hot during use.

May be getting to far ahead of myself here as you could be thinking of a simple ring of gas jets, providing an unconfined gas shroud rather than a mechanically confined shroud as above.
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10-12-2006, 08:23 AM,
#5
RE: developing argon shrouded plasma spray
Thanks Gordon,

This has given me quite a bit to think about and toy with... (i was a way off with the design idea in my head!!!!) Could be a long year!!! Forums is great.. nice work

Regards Phil
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