symboom
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How to make Aluminum foam
So i read that magnesium carbonate or calcium carbonate can be used to make aluminum foam because they act as blowing agents tge molten aluminum is
pored onto nagnesium carbonate and tge magnesium carbonate decomposes forming magnesium oxide and aluminum foam and carbon dioxide
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VSEPR_VOID
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Do you have a link to a source? What keeps all the carbon dioxide from bubbling to the surface and escaping?
Within cells interlinked
Within cells interlinked
Within cells interlinked
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symboom
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I think it keeps it from escaping is a pressure device so the co2 is forced into the aluminum i seen a video on how they make that foam
I would think that dry ice co2 would do the same although that would also be dangerous
I would have to be some sort of glass microsphere
Or something solid that can be disolved out
https://www.google.com/url?sa=t&source=web&rct=j&...
[Edited on 13-5-2018 by symboom]
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Foeskes
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I wonder what's the solubility of co2 in aluminium. Apparently Aluminium foam is prepared by dissolving a lot of gasses in Aluminium and allowing it
to come out of solution whist cooling.
Of just constantly bubbling it.
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MrHomeScientist
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Low, I would think. Metal casters use CO2 to degas aluminum before casting, to eliminate voids in the final metal piece. Hydrogen is highly
soluble in molten Al, so that should be better for foam making.
[Edited on 5-14-2018 by MrHomeScientist]
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Σldritch
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Quote: Originally posted by Foeskes  | I wonder what's the solubility of co2 in aluminium. Apparently Aluminium foam is prepared by dissolving a lot of gasses in Aluminium and allowing it
to come out of solution whist cooling.
Of just constantly bubbling it. |
Would'nt it just react with the Aluminium to form Carbon Monoxide? It may form Carbon too but that is not favored by Le Chatlier's principle.
As for the hydrogen, should it not be more soluble in Aluminium at lower temperatures? Unless you change the pressure i do not think it would work
very well as a foaming agent but at that point it starts to get very hard for the amateur. I think gas generator or dissolvable filler is the way to
go.
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Bert
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Thread Split
14-5-2018 at 13:53 |
Bert
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Titanium hydride as a blowing agent?
Attachment: Aluminum_Foam.pdf (340kB)
This file has been downloaded 312 times
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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