I have cast like that.
14ct gold to silver, no problem. 14 gold is a lower melting
temperature. 95% success
18ct gold to silver don't work good. 18ct has a higher melting
point. Fine silver works ok
Copper to silver or gold, bad. Forms a solution of gunk
Silver to copper, good-ish
18ct, 14ct, copper, to titanium, good
Now to the esoteric.
Silver to 18ct purple gold, very bad. forms a grey alloy, eats the
purple gold to death I was MOST disappointed, but with the aluminium
component, I suppose I should have known. Still, I am thinking if one
took Palladium foil, wrapped it around the purple gold and then cast,
it might work.
Silver around wood, it can be done. I used Red Ivory wood. It was
not neat and I cast the mould at room temperature. I only heated the
flask to 70C to get the wax out.. The wood burnt, but not too bad.
Silver around beach glass, (bottle glass) no problem. Just cool down
slowly. I cast at 700C so the glass is soft when the silver hits
it.10% loss of pieces due to cracking. The ones that survive sell
Silver to wafer silicone. Bad, complete disaster.Dang, I loved the
chrome look of silicone.
Silver to zugelite, not successful, but I think I now know how it
can be done. The problem was the the silver contracted and broke
apart. The stone was unburnt. The mold was heated to 200C but was
cast at room temperature.
And lastly, I made a split crucible and I melted copper and silver
in each side simultaneously and then spin cast it. Unfortunately, I
did not get a swirl of copper and silver in the mould as I had hoped
for. Instead, I got a good grade solder. Well, I tried. I think this
is how it might be done on a spin caster. The copper sprue has to be
short. The silver sprue has to be long. That way the copper arrives
first and semi freezes as the silver arrives......I think?
I got the purple gold and wood castings still so if anyone wants a
picture of them, no problem.
Cheers, Hans Meevis