I don't have any good ideas yet, but I am also interested in home made
I'm looking for an inexpensive kiln specially made for small samples
(metals, ceramics, what not). The ideal kiln would:
1. small: the size of a toaster, sample crucible no bigger than a few
2. Accurate temperature reading
3. computer controlled temperature ramp up, hold, and ramp down
4. inert atmosphere, or low pressure
I'd design it myself but I'd rather not reinvent the wheel.
these gizmos look interesting:
this looks nice... when working with reactive materials like Al and you
don't want any oxide you need a good atmosphere. It is "easy" to build
an appropriate vacuum chamber by yourself. A rotary pump going down to
1e-2 torr is fine if you continuously purge the chamber with inert gas.
just make sure that your inert gas supply is several magnitudes higher
than the leaks in the system :-)
If you need even lower O2 partial pressures, add a gas purifier
cartridge to the supply line to remove last traces oxygen from the
before heating and final pressure adjustment perform at least three
cycles pumping the chamber down and venting again with inert gas.
add a good PID controller with a DC power supply to heat the crucibles
and everything should suit your needs.
I heated titanium alloys for several hours to 1200 K in such a
controlled atmosphere at 0.1 torr and it worked perfectly. No signs of
oxidation. Just using the gas from the bottle at atmospheric pressure
was not good enough.
check the ellingham diagram for your requirements:
don't forget that kinetics are also a big issue. You may never get to
thermodynamic stability for Al in a homemade system. But the it is
sufficient if the oxidation is so slow that it dosn't matter.
They actually use two different alloys. One for the walls and one for the
lids and bottom. The walls are 3004 alloy which is a manganese addition.
And the lids are 5182 which is a magnesium addition.
About seven miles.
The critical alloying element for 2024 is copper, not magnesium or
There must be some available resources for you on alloy compositions.
Unless you like mising molten metlas to see what comes out.
steve mew wrote:
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