[Libre-silicon-devel] Announcement - Mumble session on Sunday 2021-08-29 @ 18:00 UTC

David Lanzendörfer leviathan at libresilicon.com
Wed Sep 1 22:23:55 CEST 2021

The idea was to use a normal melting furnace, then put a quartz glass bottle 
into the crucibel, so that the silicon is isolated from the carbon and then 
heat the whole thing up to a 1000 degrees Celsius, you can also just build an
earth oven furnace, if you just wanted to melt metal, there's some nice 
instructables from "Primitive Living" on YouTube, on how to melt iron with a
furnace made out of dirt :-)


On Wednesday, September 1, 2021 9:19:46 PM WEST lkcl wrote:
> On September 1, 2021 8:06:44 PM UTC, "David Lanzendörfer" 
<leviathan at libresilicon.com> wrote:
> >We also talked about the possibility to hack a foundry for melting
> >aluminum cans into a simplistic tube furnace, to which I'm tending
> >more and more, as the time without a furnace passes.
> look up Julia Longtin's 3D aluminium casting talk.  she uses 2nd hand
> stainless steel toothbrush cups as crucibles, which, containing carbon, are
> great for attracting aluminium oxide.
> a 2nd hand 2500 watt microwave oven works great.  bear in mind she blew up 3
> of them (they were 2nd hand)
> the use of an industrial / catering microwave turns out to be drastically
> cheaper than a propane furnace to run, and one hell of a lot quicker (hours
> rather than days)
> julia's talk explains that you need to cut the aluminium into small pieces
> and start with a clean seed piece, then drop the crap aluminium pieces in
> one after the other, into the melted blob.
> if you chuck all the oxidised pieces in and expect them to melt on their own
> nothing happens.
> the alu oxide sticks to the stainless steel and eventually you have to chuck
> it out. but that's ok, they are cheap.  i mean, toothbrush cup. duh.
> l.

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