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RE: Anyone used an induction heater to re-activate the getter?

Posted by pictureguy (A) on February 25, 2021 at 16:18:07

In Reply to: RE: Anyone used an induction heater to re-activate the getter? posted by AmadeusMozart on February 25, 2021 at 15:05:28:

How good a vacuum could you achieve and how did you measure it?
What kind of pump? 'Mechinical' only, either piston or rotary vane will probably not get you a good enough vacuum for metalization of a mirror.
I coated LOTS of Silicon wafers. Front AND back. Frontside coatings are or Were a 6000 series Aluminum alloy. That would be Silicon at a maximum %age to prevent precipitation and other bad stuff when doing the sinter / alloy step near the end of hte process.
Backside coatings were either a proprietary layering ending with Silver or simplly Gold.
Some metals dont stick well to others and surface preparation is critical. Some films will 'shrink' or 'stretch' after depostion resulting in FILM STRESS measured by the bow of the product. Such films will be either Tensile or Compressive....In extreme cases stuff will simply 'peel' off. Control of depostion parameters helps. Temperature? Rate of deposit? Ultimate thickness? And a bunch of other stuff.

I'll skip the gorey details, but the 2 main techniques of applying such a film are either Sputter or Evaportiaon. Sputter is done in an Inert 'backfill' atmosphere, usually Argon. But Still and all? Depostion presssures in teh 5-range are necessary.
Too much is never enough

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