Will ferromagnetic dust retain magnetism in molten aluminum?

AI Thread Summary
The discussion centers on whether ferromagnetic dust can retain magnetism when molten aluminum is poured over it in a silicone mold. The Curie temperatures for magnetite and iron are noted, with magnetite at 858 °C and iron at 1043 °C, while aluminum melts at approximately 660 °C. Concerns are raised about the potential burning of aluminum in magnetite and the behavior of ferromagnetic powder in liquid metal. Participants also express curiosity about the feasibility of using homemade magnetite powder versus industrial steel powder for this process. The overall inquiry revolves around creating aluminum details that retain a permanent magnetic field.
Nick23
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Curie temperature for magnetite is 858 C, for iron 1043 C. Duralumin melting point is about 630 C. Does this mean that if I take a small silicone mold, place a magnet underneath it, add ferromagnetic powder to the mold and then pour molten aluminum in, I will get the aluminum detail with permanent magnetic field ?

P.S. Aluminum will probably burn in magnetite, but what about pure iron ?
 
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Silicone?

The powder could stick to the ground.
Where do you get magnetized iron powder from?
 
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Silicone? The powder could stick to the ground. Where do you get magnetized iron powder from?

They use silicone molds for metal casting, some of the powder might stick, but I'm curios if it will spread over liquid metal as it does in ferromagnetic fluids. I only had home-made magnetite powder so far, made with file, hammer and a DIY ball-mill. I was thinking that industrial waste steel powder will do the trick if placed next to a magnet in the glass container.
 
Nick23 said:
Curie temperature for magnetite is 858 C, for iron 1043 C. Duralumin melting point is about 630 C. Does this mean that if I take a small silicone mold, place a magnet underneath it, add ferromagnetic powder to the mold and then pour molten aluminum in, I will get the aluminum detail with permanent magnetic field ?

P.S. Aluminum will probably burn in magnetite, but what about pure iron ?
The Curie temp for iron is 1043 °K, or about 770 °C; for magnetite it's 858 °K (585 °C)

https://en.wikipedia.org/wiki/Curie_temperature

The M.P. for aluminum is 660 °C. You've got to pay attention to the correct temperature scale here.
 
Are you trying to create an aluminum sculpture of a magnetic field?
 

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