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4hv.org :: Forums :: High Voltage
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Tungsten circular current electrode
Move Thread LAN_403
Signification
Tue Jun 25 2019, 03:01AM Print
Signification Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
 		I am working on various spark gaps. This one is circular. and must be able to handle a capacitor-triggered spark (plasma) circular gap (one electrode). I need some very tough electrodes that can take a LOT of high current repetitive pulses and heat. Stripped 8 and 10 gauge magnet wire can be simply bend into a circle but gets eaten away much too fast (it works great until then).

I was thinking that the rod found down the middle of a spark plug would work (tungsten, beryllium, iridium, etc.), but how do I solve the problem of bending such material into a closed circular loop and attaching a wire lead to it--any ideas?
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Sulaiman
Tue Jun 25 2019, 05:03AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
 		Pure tungsten rods can be purchased via eBay etc.
e.g. Link2 Link2 etc.

I have used similar for sgtc, if using more than a few watts the electrodes will need heatsinking.

Maybe a steel washer could be used as the outer ring ?

Nichrome wire or stainless steel wire may be an option ?
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Signification
Wed Jun 26 2019, 06:00AM
Signification Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
 		Thanks much,
I am going to look into it right away. ...ever heard of circular Tungsten loops?
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klugesmith
Wed Jun 26 2019, 07:02AM
klugesmith Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
 		Aren't tungsten rods for TIG welding generally brittle?

Some ideas that came up on another forum recently, for refractory wire that can be bent into a circle:

- stranded or braided tungsten wire (perhaps made as metal-evaporation filaments?)

- Tungsten-rhenium alloy wire, in standard percentages for thermocouple use, is allegedly more ductile than pure W. Here are some W-Re wire properties and diameters for sale: Link2

- Niobium wire in many diameters is easy to get and easy to work with. That element has about the 6th highest melting point of all. Popular these days in jewelry and chain mail. Check out theringlord.com. Nb wire in many bright anodized colors, but plain is a bit less expensive.
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Signification
Tue Jul 02 2019, 05:25AM
Signification Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
 		Thanks all!!!

@klugesmith:

Is Tungsten brittle? I really don't know, but this may be a bit telling.https://www.youtube.com/watch? v=K_LToWAZoSo
...hard to understand the speech.
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Signification
Tue Jul 02 2019, 05:30AM
Signification Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
Signification wrote ...

Thanks all!!!

@klugesmith:

Is Tungsten brittle? I really don't know, but this may be a bit telling. Link2
...hard to understand the speech.
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Signification
Tue Jul 02 2019, 05:32AM
Signification Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
Signification wrote ...

Thanks all!!!

@klugesmith:

Is Tungsten brittle? I really don't know, but this may be a bit telling. from youtube. Link2
...hard to understand the speech.
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2Spoons
Tue Jul 02 2019, 10:37PM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
 		Its brittle when cold. Heat it red hot to bend it.
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Signification
Thu Jul 11 2019, 07:30AM
Signification Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
 		...finally got it! I used one of those 12mm laser module heatsinks (NOT the kind that uses the screws, but the type that makes full surface contact). I first wrapped the rod with stripped 16AWG Cu wire and hammered it in with a rubber mallet...very tight fit. Looks like 17AWG would be perfect. 18AWG--too small. The heatsink mounting holes were used as wire contacts.
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