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In Reply to: Re: Cryogenic treatment posted by heatha on March 21, 2000 at 13:52:33:
Relax Molecularlly is the opposite of what happens when
you cryogenicly temper something.What happens is that they bring it to as close to negitive 300
as they can by lowering the temp very slowly over a period of days,
then they reverse the process and bring it back to room temp over
a period of days.What this does, if you remember in your highschool physics...
When matter gets cold it's molecules bunch up closer together.
When they get hot they get excited and spread out. When you bring
something to such a low temp, especially a metal, it aligns the
molecules in a very tight stright order, and on a near perfect
north/south compaired to the build of the material. When the material
is brough back up to room temp, it retains that straight north south
alignment making it smoother and stronger on the molecular level.The insulation would be completely uneffected. Just about everything
but tubes could be processed in this way...tubes excluded because they
are a vaccume and that would be a bad thing to subject to temp extremes.Hope that helps clear some of this up.
TLR
I too heard some story about annealing the residual stresses, by relieving the residual strains. Somehow since the atoms are compacted the historical stress-strain relationship is lost. That’s what was reported anyway. I thought the only advantage was possibly cold welding of dislocations which probably minimizes their singularities. Some have maintained that the dislocations are eliminated but that seems extremely improbable. Voids are much more likely to exist than rearrangement of all the atoms required to fix the atomic lattice while the thermal kinetic energy is being tapped.
I wonder if there is any risk or negative effect of treating things more than once. I've heard from an outside source that you should only do it once, but why that may be true is unknown.Contrary to what you said, I've also heard about vacuum tubes of all sizes being treated, which I assume would have to be done at a slow temperature change rates. One would think it could extend tube life as well.
The few shops I've called to have some work done told
me they couldn't put a vaccume into the deep freeze.
Maybe a special setup is needed for it.TLR
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