fus
FUSING LOW MELTING TEMPERATURE
METAL WITH HIGH MELTING TEMPERATURE METAL
WILL MELT BOTH METALS AT MUCH LOWER TEMPERATURES
80% TIN-(232C) 20% GOLD-(1063C) MELTING
TEMPERATURE 280C, CALLED
EUTECTIC COMPOSITION
When low melting metal is used to
fuse high melting metal the melting point of the combined metals
will lower, providing the volume of low melting metal exceeds the high melting
metal by various margins.
The pictures below show a dor'e fusion metal placed on a stainless steel plate
and heated to just
above the melting temperature of the collection metal, and tilted just enough to
allow the lower melting
metal to flow to one side, leaving the dross/loaded metal behind. The flow goes
left to right.
The melt above shows the left side of the melt very crusty and the right side flows with ease.
The right side flow, flows with ease caring less high temperature melting melting metals.
The left side is loaded with higher melting
temperature as the slag or dross is much denser in
metals other than the collecting metal.
A high temperature flux fusion
with bismuth and ore was poured into a iron mold resulted in the
button above, without oxygen present as molten glass flux kept the oxidation to
a minimum.
Inverting the color will highlight the metals collected by the bismuth.
The metal mass is the results of reheating
the button and allowing oxygen to be present to add to
the oxidation surface.
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The wrinkles on the surface is egg shell like and not just a oxidized surface.
The edge and bottom is a mixture of blue, purple, and gold.
The close up of the skin when gold is predominate is egg shell like.
The above picture is a low temperature dry fusion,
and high temperature no flux
fusion to see the reaction to both temperature ranges.
The quick freezing shell of the
surface indicates a higher temperature metal present . The close up top left
shows the thickness of the shell. The lower left, is the flow with a finger nail
looking sheet of metal that went solid first, part of the shell, and stays on
top. The very black at the top rim is a metal that reacts in a wet glassy manor,
it seams to bond to the stainless steel surface of the spatula, under the main
melt.
The shell created a dome and when
the main body of the melt was under minded the shell
edge of 10 microns is seen, in color and inverted color.
REF;
Thomas Thomson MD FRSE, Elements of
Chemistry, wrote in 1810,
when bismuth at a higher ratio
is melted with platinum, a blue to purple color will be the case when exposed to
air. Gold will appear as dulled bronze, brass, or golden.
Bismuth when pure will leave a rainbow
color, blue, golden, gray, when exposed to
air, however, when fused with noble metals, the surface can be extra dark blue, purple,
golden with a thick skin like surface and leave denser metal dross behind when
elevated.