I have questions on two things. The first is any quench time? Do I
even bother to quench? With casting gold, silver, and platinum I
always have. I don't believe a foundry can quench a bronze
casting. Should I?
Bronze is a funny animal, if you quench it after casting, it will be
in an annealed state, if you let it air coll it will still be in an
annealed state. This may be a quirk of the 90/10 bronze I alloy
myself, Bovin says something similar.
The second is a remelting old sprus. Again is the spru button
remelted with new added? Many times with gold and silver I'll
remelt several times without adding new. I have so far been mixing
about 50/50 new and old.
Well you can, but it’s not as nice as a “fresh batch of cookie
The cast that did not turn out was very brittle and the pieces
broke when bent.
Melt temperature for both is 1900f.
Could you outline your melting procedure for me please e.g melting
in an open crucible… etc. etc.
My procedure for alloying 90/10 bronze to make a bronze ingot or a
casting. *Note: I use the same procedure whether I use a large
furnace or a micro furnace, I use open crucible only at school. I use
propane, as the fuel, and I like to use Delft clay.
Fill the empty crucible with flux, then empty it out.
Put in my measured quantity of tin
Cover with granulated copper
Put in come more flux
Turn on the furnace
Check periodically for the bronze to melt
When melted stir with a green stick to remove impurities
a) For a small melt: When pouring into the mould keep a torch on
the liquid metal, until it has all entered the mould, and if there
is any surplus, into your ready surplus mould.
b) For a larger melt: A torch isn’t necessary as the heat from the
volume of the molten bronze alleviates the need for the use of a hand
For remelting bronze, the procedure is pretty much the same, but
it’s very important to make sure you don’t overheat your bronze, or
boil it, otherwise you will burn off tin as vapour.
With the bronze I'm mixing myself I should be able to save a bit
of money, but it's not too expensive anyway. I'll let everyone know
the result of mixing your own. You can buy a pound of bronze for
about $12.00. That's about.05 cents a pennyweight. The white bronze
has a good looking color.
Personally I don’t like zinc for health reasons, and when I use
solder I now wear a fume mask, as I appear to be sensitive to zinc
But let me know how you go.
Regards Charles A.