Molten Metal in a Vacuum

Molten Metal in a Vacuum

[Captioned via Y Translator]
This video is sponsored
by NordVPN. Molten metal in a vacuum
chamber, what happens to it? Will it bubble
and boil like water? Will it hold its heat
for a really long time? We’re going to find out. [Music] For years,
we have done experiments using a vacuum chamber,
and we’ve done experiments using molten metal, and today, for the first time,
we’re going to see what happens if we put molten metal
into a vacuum chamber. Here’s what we’re going to try. We’ve got two cups
of equal amounts of aluminum. We’re going to melt
them both down. One of them will go
inside a vacuum chamber, and one of them will sit
outside the vacuum chamber. Let’s find out what
happens differently. We’ve got these two steel cups,
and we’re going to put these into our furnace,
and melt down the aluminum inside them. They started off
as the same cup. We cut this one in half just
so that we can see inside it better. We just want
to watch what happens inside our vacuum chamber,
and visions going to be a little bit limited. This one’s going to be
outside the vacuum chamber, so we should be able to see
into it just fine anyway. We’ve also got on the lid
of our vacuum chamber, it’s digital thermometer
that goes up to about 1900 degrees Fahrenheit, or just over 1,000
degrees Celsius. What we’re going to do
is tape that switch down, and set it on so that
as we pull out the vacuum and leave it in a vacuum, it is giving us
a constant readout of the temperature of the metal. Hopefully,
that will let us see how fast or slow the metal cools down. [Music] I think we’re going
to call that good. [Music] Thermometer,
which is still attached to this lid, actually only showing a temperature
of about 500 degrees Fahrenheit. A little bit more depending
on the angle I get. I think it’s probably kind
of hard to read aluminum, which is very shiny in places. It might struggle with that. Aluminum isn’t liquid
at 500 Fahrenheit. So that’s probably
not a perfect representation, but it is going to give us
a comparison between the two. Aluminum’s definitely
cooling down. It’s now at that stage
that’s weirdly clay like. I can stab into it
with a little bit of pressure, but it’s definitely not liquid. [Music] Still showing a span
of around 350 to 400 Fahrenheit. Lets see if I get the same result with this one. Yeah, 35 to 410-450,
and this is only been going for maybe five minutes
out of the furnace. Order of operations, I’m going
to tape down the trigger. I’m going to pull out the metal
cup full of molten aluminum, set it on the brick,
throw the lid on, and then turn on the vacuum. [Music] Metal in the chamber. We’re suddenly getting a very
high temperature reading. All right,
we are lowering the pressure in the vacuum chamber. Oh, no, our thermometer
just turned off. [Music] The aluminum is putting off
so much heat, it heated up the electrical tape,
which got loose, and let go of our button. [Music] It’s going to come off
again, I think. I think I even saw a couple
of bubbles coming up out of the aluminum there. Our thermometer
did turn off again. It was reading about
435 when it turned off, but that aluminum
is bubbling, just a little bit. I’ll admit, I did not think
we are going to get any bubbling from our metal. I’ve never seen
molten aluminum bubble the way it’s doing right now,
as it cool down. So, I think this is the vacuum
that’s causing that. The glass has actually
heated up a lot. It’s really hot to the touch. [Music] Oh no, see if it still works. Error. This whole thing is really hot. [Music] Hello– Oh man, that is bright. Okay, the–
Let’s go in the shade. Didn’t think this through. We’re good. Okay. Hello! Are people trying to steal
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out our vacuumed metal. I want to try
and get both of these pieces of aluminum out,
and see what differences I can find. So, let’s see
if we can separate them. [Music] Here we go. [Music] All right. So this is interesting. This is sort
of some pieces of the aluminum that melted,
but I never stirred the aluminum on top of it. So you can just sort of see
the stick formation left. This one seems
to have more pitting and bubbling on the bottom, and again, this is
the one that was in the vacuum chamber,
and this is the one that was not. I think I want to cut both
of these in half, and see if there’s
any difference on the inside. [Music] I would say on the inside,
they look pretty much the same, at least, when you cut them
in half with a hacksaw. So what did we get
out of putting molten metal in the vacuum chamber? The surface definitely
cooled down differently. The one that we put
in the vacuum chamber has a lot more pits,
a lot more strange angles to it, and overall,
just a very different texture. The one that was
in the vacuum chamber, is more of a flat, silvery
aluminum color. Maybe we have a different sort
of aluminum oxide that’s formed, different composition,
different speed that it formed. It’s pretty much the same colors
on what’s on the edge of this one here. This one’s the same color
pretty much all the way across, except for a little bit
of slag here in the corner. And then of course,
what surprised me the most is that while it was
in the vacuum chamber, it seemed to have
bubbles rising up out of it. I was also amazed at how
much heat it put off. The outside of that vacuum
chamber got really hot. We did have, something
of a casualty of war. This is the thermometer that
I was trying to use, and it seems to have
an issue scanning the surface of aluminum. It wasn’t really giving
us an accurate reading. It was only giving us a reading
of about 450 degrees Fahrenheit while the aluminum
was still molten, and aluminum does not melt
that temperature. So unfortunately,
this is not the best way to measure the temperature
of molten aluminum. We’re going to have to look
into that a little bit later. Maybe we can find
a thermocouple that actually goes down
into the aluminum to measure it there. So we may have to revisit
this experiment later on when we have a little bit
more industrial equipment that can handle some
of these temperatures. Also, thanks again
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100 thoughts on “Molten Metal in a Vacuum

  1. please do an experiment where you see if ice will melt in a vacuum chamber
    I think it would stay clod for a while

  2. Did you set the EMS on the infrared thermometer to the proper emissivity for aluminum? If not that is the reason you didn't get accurate readings on the thermometer.

  3. I'm guessing the color difference is due to the difference in concentration of aluminium oxide. The open air one is interacting constantly with open air while the vacuum chamber one interacts with less oxygen and thus is a more pure aluminium.

  4. What would happen if I were to accidentally put a live round
    of ammunition into the foundry? Example I go to a shooting range to collect
    spent brass to melt down and missed a live round and it went into the foundry.

  5. You should put Dry Ice (frozen CO2) in a sealed container and see if it'll make (Liquid CO2) as it heats, and see what pressures it builds to (if any)… I think you get it.
    Short Version: Make Liquid CO2 from Dry Ice!! 🙂

  6. Hey. I'm a young farmer from Inverness Scotland. I'm wondering if there are any experiments I could do myself with nitrogen sulphate? Would be greatly appreciated. Love the videos BTW

  7. I haven't read through all the comments to see if anyone else suggested this, but this video makes me wonder if you can pump air into molten aluminum to create bubbly metal, like a sponge.

  8. Wait, isnt molten metal in the vacuum chamber the metal purification metod? I mean they do this at the foundry and workspace here ?

  9. Not gonna lie but if you don't have any or very little data on your computer why would a hacker even bother. Unless they just want to look through your camera lens that i duck taped shut.
    I by no means am down talking Nord VPN, but anything make by man can also be broken by another

  10. There will always be a certain amount of dissolved gas contained within the molten aluminum. Placing the molten aluminum in a vacuum chamber and lowering the pressure will cause the entrained gas to attempt to leave the aluminum. The aluminum solidified during this process, which has resulted in the lumpy and uneven surface texture you observed. >Charlie

  11. And straight away the study is flawed as you have them in different sized containers, doing a comparison between the two is invalid

  12. Molten aluminum pours often have porosity in them from trapped hydrogen. Commercial foundries use rotary degassing lances and an inert gas to help the hydrogen escape before pouring. I wonder if that was some of the hydrogen being drawn out.

  13. cpurse itd bubble. youre pulling a vacuum and sucking out the gases from the aluminium. Itd also 'boil' or melt at a lower temperature while in a vacuum

  14. Put liquig galium on the vacume chamber aluminum and compare it to normal alumanum to see if it changed the oxide coating

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