Recent content by drcoxfate

Thank you! I think it's bizarre enough. I put reading about Levitron Revolution devices on my schedule.

Thanks, Baluncore. I should probably learn something from what you said. Baluncore, you now mentioned another type of materials. Those aren't foams and their main purpose isn't directed toward crash energy absorption which is the main application of syntactic metallic foams. Energy absorption...

Oh, come on people. No ideas?

Baluncore, shooting dry ice into the melt sounds pretty cool! Still, there is a problem of uniform distribution unless you somehow manage to shoot pieces of dry ice with different forces and do that all really fast as you build new layers by going upward from the very bottom to the surface of...

Berkeman, glad to know that it seems interesting! Thanks for your response. Using inert gas bubbles coming up and down through the iron melt isn't a new thing. It's been used for a long time. But the problem is that the voids are located in some chaotic pattern. I thought that maybe by...

Hi, Baluncore. Thanks for your response! I would like to make a closed cell foam. Anything that has density significantly less than that of steel would work as a fillant of the voids. The price for that material should be reasonable. Sorry. I couldn't get what exactly you mean in the second...

If cobalt is used then the idea is that hollow cobalt spheres wouldn't be allowed just to sink in the melt due to applied magnetic field. (On the other hand, some sinking could be beneficial as in gravity-inflitration method of making metallic foams?) Thank you for your help, Vanadium 50!

Thank you for your response, Vanadium 50! Cobalt does have the highest Curie Temperature (1400K). I know barely anything about cobalt. Isn't cobalt a bit expensive? Molten steel is hot enough to demagnetize it but maybe some ceramic coating would work to allow cobalt hollow objects (like...

Thanks, berkeman! I was a bit confused about shielding and thought that maybe I didn't get something. But now you mentioned the Curie Temperature and made me sure that liquid steel wouldn't magnetically shield anything inside (or it would but only to an extent that we can neglect). I remembered...

Hey, Dave! Thanks! Could you please explain in detail why molten steel would magnetically shield anything that is inside? In production of metallic foams, hollow alumina microspheres are used because of the inherent resistance to high temperatures (molten steel) and high strength. In any other...

Thank you for your response. Could you please point out what exactly is vague?

I was wondering if anyone could suggest a material that would stay in a solid state within molten steel/aluminum at least for several seconds. There are also two things: 1) the material should react to a magnetic field applied from the outside 2) material's density should be less than that of...