Jarvis,
I have that book somewhere.? I will look for it again.? But the fix for me is to warm up the coils a little then turn them up to high and melt the aluminum onto them.? I have tried it many ways and that is what keeps the aluminum from falling off the coils.
Drew
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On Wed, Oct 5, 2011 at 12:00 PM, Jarvis Krumbein
<kpjarvis2003@...> wrote:
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Drew, in a previous reply I suggested that you get a copy of "Proceedures in Experimental Physics" (attached).? That advice still applies.? If you can't find a copy, I can copy the appropriate pages and e-mail them to you.? I think that your filament wetting problem could be solved .
?
Jarvis Krumbein
Sent: Wednesday, October 5, 2011 6:18 AM
Subject: Re: [VacuumX] Evaporating aluminum from tungsten (or tantalum)
?
Well, the problems I was having were all thermodynamic in nature.? My little 500 BTU per hour water chiller simply could not take out the 6000 BTU's / hr that the diff pumps were putting into the water loop.? When I switched back to flowing 75 deg F tap water at about a gallon per minute once thru the diff pump water jackets and dump to the ground the problems went away.? I am now dedicating the little chiller to the vapor traps so they are running at like 55 deg F.? I can now run the diff pumps for the 3 hrs it takes to get the chamber down to aluminizing vacuum levels. ? ??
I am noticing that if I heat the tungsten coils slowly that the aluminum candy canes fall off the coils much more often.? When I heat the coils fast the aluminum canes melt in about 5 seconds and
wick onto the tungsten as they should.? Not sure how to fix this.? For now, I will heat the coils fast and pay the price of some tungsten oxide getting driven off the coils before the aluminum.?
Drew in sunny Florida
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