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Casting in a kiln


#1

Some thoughts off the top of my head. Seems to me you could pour
the investment into any container. The container is needed to
contain the investment until it solidifies. If the investment is
thick enough, once it solidifies, the container will be meaningless.
The investment will support itself.

When I first started vacuum casting I used steel cans from the
kitchen for flasks. When vacuum casting the lower ring of the can
must not melt so aluminum was out.

Your description leaves me to believe you plan on putting the metal
into the mold and place it in the oven. The oven will be heated as
rapidly as possible. Once the metal is melted you will turn off the
oven and let the metal solidify and cool down. The cool down time
could be lengthy.

You will find that if you are casting any metal that has copper in
you will get a coat of firescale the will be almost impossible to
remove. Firescale will be forming on the metal as long as it is
over about 1000 degrees.

Sounds like an interesting process, Don’t give up and don’t let
naysayers discourage you. Lee Epperson


#2

Lee, I guess I might be classified as a naysayer in this case. I
agree with your comments that it just might work but I don’t know
why it should be done that way…I can’t think of an advantage. I
can think of some potential problems. One big one is at anything
over 1350 deg, investment begins to break down. In fact, I let a
load get up to around 1450 once and as I put one of the flasks into
the flask bed of the centrifigal machine, I noticed it had started
turning to dust! Lord only knows what would result if you took it up
to metal melting temp!?

Another is heating metal in a kiln which has no oxygen control means
lotttsss of potential for heavy firescale. You pointed out the temp
aspect but did not comment on the lack of any 02 control. I’m sure I
can think of some others as well.

Just doesn’t sound like a good way to go to me.

Cheers from Don at The Charles Belle Studio in SOFL where simple
elegance IS fine jewelry! @coralnut2