Field's metal: I have an idea

I was going to use a small ceramic crucible in which to melt my tin, bismuth
and indium--then I learned that the resulting alloy (Field's metal) "wets"
ceramic--meaning the ingot would be cemented to the ceramic once it cooled.
I think I'm just going to use a Teflon-coated frying pan instead. Teflon is
pretty stable and non-reactive up to 500 degrees, and once the indium melts
at 313 degrees, it should start to dissolve the tin and bismuth, so I
wouldn't have to approach the melting points of those metals.
Any thoughts on this?
Reply to
Ernie Sty
Loading thread data ...
Ernie - the aluminum self heating pots available at department stores work with 63/37 (tin/lead) solder. The temperature is slightly low and the regulation is a bit too broad. The unit I measured showed around 40 degf hi/lo diference at max temperature. This was after 1/2 hour stabalizing.
Hul
Ernie Sty wrote:
Reply to
dbr
"Ernie Sty" wrote: (clip) Any thoughts on this? ^^^^^^^^^^^^^^ Why not just remelt it in the same crucible when you're ready to use it?
Reply to
Leo Lichtman
Because most, if not all metals, will expand a great deal before they go liquid. Pop! goes the crucible!
Cheers Trevor Jones
Reply to
Trevor Jones
But the reverse must be true also.. When the melt cools the first time, wouldn't it pull away from the walls of the crucible, or at least create cracks in the solidifing melt? (Disclaimer, the only metal I've melted in a pot is Lead...)
Reply to
James Lerch
You're both probably right. However since Field's metal melts at 144 F, I'm not sure it would expand all that much?
Regardless, I'm going to use a Teflon-coated saucepan on the stovetop for this project. What's the worst that could happen?
Reply to
Ernie Sty
That there'll be a scratch in the Teflon and your alloy will:- a) be contaminated. b) run out all over the stove top through the hole it dissolved.
You did ask :-)
Mark Rand RTFM
Reply to
Mark Rand
Worse yet: c) wife comes home during your experiment and finds you doing metalworking, again, with the appliances.
Dave
P.S. A dishwasher, while a fine parts washer, is not perceived as such by roughly half of the population. Strange but true.
Reply to
Dave Hinz
He could contaminate his wurst the next time he cooks it in that pan....
Reply to
Jim Stewart
Serves him right if he is dumb enough to put his pecker in a skillet.
j
Reply to
jusme
And you did answer! Fortunately, the new saucepan I bought for this purpose ($2.99) was unscratched and if the metals expanded at all it wasn't anything noticeable.
In other words, it worked!!
Reply to
Ernie Sty
No, actually she doesn't seem to mind. I picked a good one that way...
LOL Point well made. :-)
Reply to
Ernie Sty

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.