Experiments which successfully added tin to copper by using cassiterite in a
crucible have been made in France, and I believe (but am not sure) by
Charles. I will try later to find time to put the references on arch-metals.
Noel Gale.
----- Original Message -----
From: Richard Furrer <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, April 24, 2000 6:40 PM
Subject: Re: Adding cassiterite to molten Cu
> Hello,
> Is the understanding that this is a closed system or an open one. Could
results
> be varied by placing in a closed crucible?
> Richard Furrer
>
> [log in to unmask] wrote:
>
> > The subject of producing bronze (10% Sn) by adding cassiterite to molten
Cu
> > has again arisen. I have maintained for some time now that calculations
based
> > upon the thermodynamics (primarily the Ellingham diagram) indicate that
no
> > more than about one or two per cent Sn will end up in the solidified
alloy.
> > This is because the kinetics of reducing SnO ( SnO to Sn by the Cu) are
close
> > to those for oxidizing Cu to CuO and simultaneously reducing CuO to Cu
by the
> > Sn. The net result is to produce about one to two per cent Sn.
> >
> > I have been told that there are results from some experiments indicating
that
> > these calculations are deceiving and that a normal bronze (that is, 10%
Sn in
> > 90% Cu) can be obtained (solely by adding cassiterite to molten Cu).
Does
> > anyone know of such experiments?
> > R. Maddin
>
>
>
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