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4hv.org :: Forums :: Chemistry
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Inert metals? / PVD process

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Daedronus
Mon Sept 10 2012, 03:47PM Print
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		Hey

What metals are inert in a normal atmosphere? And I mean really inert (not just passivated by oxide layers).
Including high temperature up to the melting point.

I think beside gold silver also fits.

The idea is I'm looking for the cheapest way to vacuum plate (sputter or evaporation) and I don't want to use diffusion or turbo pumps or inert gases, as I don't have any of them.
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Dri0m
Mon Sept 10 2012, 05:12PM
Dri0m Registered Member #4497 Joined: Thu Apr 19 2012, 12:53PM
Location: Behind you
Posts: 62
 		Link2
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Daedronus
Mon Sept 10 2012, 07:57PM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		Yes, I have seen that list.

I think some of then do react with the "air" at certain temperatures, don't they?

If I am to evaporate them in vacuum (crappy vacuum, still too much of oxygen, from copper for example I got lots of black power, I assume 2CuO and a little bit of of red 2Cu2O?)
they have to be completely inert to O2, CO2, etc.

I'm trying to metalize stuff without a diffusion or turbo pump or argon bottles.
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2Spoons
Mon Sept 10 2012, 10:49PM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
 		How about putting in a piece of sacrificial metal to absorb the excess air before attempting metalization? Something like magnesium ribbon, that could be electrically heated to activate it.
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...
Wed Sept 12 2012, 04:07AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		Just FYI silver definitely tarnishes when you heat it (IIRC it is not the O2 that does it, but rather one of the trace gasses in air), platinum might work, IIRC it does form an oxide however the oxide has a higher boiling point than the Pt so it just evaporates away. You could try aluminum and a getter system (I have heard that you can use the aluminum you are melting as a getter, as long as your chamber is small enough).

I used an aluminum evaporator tool at UCSB which was just a large bell jar with a diffusion pump connected to the bottom, no argon purge needed. I also used a gold sputtering tool which just had a rotary vane mechanical pump (no argon either, it had a port that was supposed to have argon plumbed to it, but I don't think we had it connected).

If you don't want to use gold don't bother looking up the price of palladium or the other more exotic metals wink
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Daedronus
Wed Sept 12 2012, 09:26AM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		I was going to try aluminum as a getter, but then I realized I don't actually have aluminum, only alloys of aluminum.

Silver would have been nice if it worked, it's a lot cheaper then god.

Palladium is also cheap (relatively) but it does react with oxygen above 350 degrees.

I guess I can live with using gold, I don't really need any significant thickness, just to get non metallic materials conductive.

Link2
This is how it looks with copper, no metal is deposited at all, just oxide?

PS: I think the damn think leaks like crazy, I need a pressure gauge.....


Another idea would be to use something that will get a oxide that is actually a conductor and has good adhesion, like indium? maybe?
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Bored Chemist
Wed Sept 12 2012, 07:20PM
Bored Chemist Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
 		Do you know that finely powdered metals are generally black?
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Daedronus
Wed Sept 12 2012, 07:34PM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		No, I didn't, but I'm still convinced that is just oxide.

I have ordered some pure gold and tungsten boats, I'll try again with that and see what I get.
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IntraWinding
Fri Sept 14 2012, 01:01PM
IntraWinding Registered Member #2261 Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
 		I think you should work on getting a better vacuum instead.
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Daedronus
Fri Sept 14 2012, 03:06PM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		I am, I plan to make a semi decent vacuum chamber around this item:
Link2

But I'll probably have to wait for 2 or 3 more paychecks...

I still need a ISO63(?) reducer to KF50, KF50->16, KF16 clamps rings, KF16 bellows that will go the the vacuum pump, etc...

My current vacuum pump is a Welch 8905A and it should be good, it looked new when I got it.
It's rated for 2*10^-3 torr (2 microns?).
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