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Re: Cryogenic Tempering of Wire

I will second what several other people said. I think this is a case of "people have heard of cryo treating so maybe they will believe that it works for copper wire".

The copper in copper wire is pretty much elemental. There is no "tighter more organized pattern", every metal forms a crystal structure and for copper it's called face centered cubic.

http://www.geo.mtu.edu/museum/Gallery/Copper/crystals.html

There are occasional discontinuities in this structure as well as grain boundaries. Picture the wire as the US and yourself as an electron travelling the wire. If you are walking across the country, a state line to you would be like a grain boundary to an electron. That is to say, in the scale of the crystal structure, grain boundaries are very very far apart. A grain is on the order of a million times bigger than the interatomic distance.

I am talking way past my level now but I really don't think that inductance has any significant relationship to microstructure. Isn't inductance related to the macrostructure of the cable? Anyone care to help here?

Also note that conductivity and material strength are usually inversely related. Small grains=strong material, large grains=good conductivity. The exception is single crystal material which is very strong and has good conductivity, though not significantly better than any form of the same metal.

Just my $0.02, I'm sure there are a few errors too.

cheers
mbs



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  • Re: Cryogenic Tempering of Wire - micah 02/9/0110:07:16 02/9/01 (0)


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