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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.
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.
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.
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
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