Titanium walls

It may be difficult to separate "theory" from "application," but let''s see if this helps facilitate the discussion.
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Roberto Ferrari
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Titanium walls

Post by Roberto Ferrari » Tue Oct 09, 2018 4:08 pm

Following recent suggestion by Richard to open a discussion about the potential usefulness of titanium as the walls of the fusor chamber, here is some idea.
The cost of a full titanium chamber was mentioned as prohibitive.
A more economic alternative would be to deposit titanium onto the SS walls.
The principle of the titanium sublimation pump could be used to deposit a titanium film. 50 microns could be enough to interact with deuterons.
The setup would require a titanium filament, feed with many amps in order to start sublimation.
Having not easy way to measure the deposit, some experiments are mandatory. May be a square inch of SS exposed to the vapours under controlled parameters and then measuring it by metallographic microscopy. Surely there is some literature about Ti vacuum deposits.

ian_krase
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Re: Titanium walls

Post by ian_krase » Thu Oct 11, 2018 2:58 am

Sputtering Ti is also possible.

You could research Quartz Crystal deposition monitors. The detuning of a Crystal oscillator measures the mass per area.

You could also possibly measure mass loss of your Ti source with sensitive analytical balance.

John Futter
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Re: Titanium walls

Post by John Futter » Thu Oct 11, 2018 6:10 am

I do sputtering all the time
both Ti and Al are very difficult due to oxidation you need vacuums in the 10^minus 8 or better to stop these oxidizing.
all can be done with a cryo pump but I have not seen this sort of system in use on this forum.

You can evaporate both of these and get reasonable results due to a much larger /quicker deposition of the required film. So for the Joe average vacuum expert like on this site I would persue evap via ebeam or standard tungsten boat /basket

Roberto Ferrari
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Re: Titanium walls

Post by Roberto Ferrari » Fri Oct 12, 2018 11:50 am

Ian, John thank you for your comments.
Yes, will require some additional equipment but someone will be able to do.

Jerry Biehler
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Re: Titanium walls

Post by Jerry Biehler » Sat Oct 13, 2018 6:02 am

Just look at a titanium sorption pump. Basically filaments with Ti on them and the Ti evaporates on the walls and the active gasses bind with the fresh Ti and are removed from the atmosphere. So just buy some replacement filaments for these.

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