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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