[BC] Silver soldering BRASS

[seaberg1 at sbcglobal.net]

Professor Al Loy had some students put the mix in a centrifuge but they 
short-cut the mixing process and wound up with an undetermined mix.  Thus 
the melting point variation.  This also brings up another question....how 
long does the ore spin in a centrifuge to separate Uranium from the ore. 
The movie (Can't remember the title.) suggests it is a rather lengthly 
process.....but they do things differently in the movies.

Bob Seaberg -- W3MDM

----- Original Message ----- 
From: "Gary Peterson" <kzerocx at rap.midco.net>
To: <broadcast at radiolists.net>
Sent: Friday, October 19, 2007 8:17 AM
Subject: [BC] Silver soldering BRASS


>" Copper melts at lower temp. than brass, thus the theory that you
> can't braze copper. ( though I've done it )
> -- 
> Cowboy "
>
> I guess I disagree with this one statement, above.  Every alloy, I am 
> aware
> of, melts at a lower temperature than that  of the highest-melting
> constituent, pure element.  IIRC, this is because the atoms of different
> elements cannot be packed, in a crystalline structure, as densely as ones
> that are of all the same size.
>
> Pure copper (Cu) melts at 1981 degrees F.  Pure zinc (Zn) melts at 786
> degrees F.  A brass alloy comprised of 85% Cu and 15% Zn has a listed
> melting point of 1652-1724 degrees F.  I'm not certain why this specific
> composition has a range, rather than a specific melting point.  I'm quite
> certain that the higher the ratio of zinc to copper, the lower the M.P. of
> the resulting brass alloy.
>
> (I always thought the ideal name for a professor of metallurgy would be Al
> Loy)
>
> Gary, K(zero)CX
> Rapid City, SD
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