Aluminium+copper alloy vacuum outgassing

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Using aluminium 2007 alloy for an oil diffusion vacuum pump part raises concerns about potential outgassing due to its copper and lead content. The presence of an oxide layer and moisture on the aluminium surface may necessitate a careful bake-out process and possibly surface treatment to minimize outgassing. While 2007 is easier to machine, comparisons with 6061 or 6082 alloys suggest that the choice may impact performance, particularly in terms of thermal stability. The main body of the pump will be stainless steel, which may mitigate some issues related to dimensional changes. Overall, careful consideration of material properties and processing techniques is essential to ensure optimal vacuum performance.
Alberto Spain
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Can I use aluminium 2007 for high vacuum projects it since contains copper?
Hello.

I need to make a part for a oil difussion vacuum pump and I want to use aluminium 2007 allow. This allow contains around 4% of copper and 1,5% of lead. I don´t know if those metals can outgass during the vacuum process. That vacuum pump is supposed to reach around 5 x 10 -6 mbar or 5 x 10 -4 Pa

Thank you

best regards
 
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That aluminium surface will have an oxide layer, plus some diffused moisture...

You may have to tackle like a thermionic valve and slowly bake-out, then 'getter'...

IIRC, you may even need to use an electron beam or cold-discharge to 'scrub' surface. Perhaps research how space-telescope frames etc are 'cleaned up' to prevent out-gassing tainting the sensors...
 
A diffusion pump is (basically) an oil boiler. I would be more worried about the managing the headache of large dimension changes (with temperature) that will occur with aluminum - Those will last forever (or until something breaks). Heating/Cooling a diffusion pump is a noisy affair (even with much more thermally stable materials). All off-gassing stops eventually (explained this to my wife last weekend - the dog vomited in her new car...)
 
Thanks for your answers. I hacve to use aluminium. I don´t have the skills nor the equipment to machine stainless steel.

But since I´m going to use aluminium, is htere any problem using 2007 instead 6061 or 6082. I went for the 2007 because it is easy to machine.

And about the changing in dimensions, the aluminium is only for the "jets", the main body will be stainless steel
 
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