29 replies to this topic

[PyroNitrate]

I know its easier to buy, just wan't to know how to do it, tried putting it in a blender, no good

[Stuart]

Apparently someone (nobody on the forum) put some Al foil in a ball mill for 6 weeks and it came out like dust.

[phildunford]

I tried putting some Tiranti 200 mesh in my ball and milling for 4 hours...

No change whatsoever!!

[Stuart]

Well, there is a slight diffrence between 4 hours and 6 weeks

Edited by Stuart, 07 October 2003 - 03:27 PM.

[PanMaster]

It is true, but you need to use steel media and of course a barrel designed for grinding metal (one with vanes or lifting strips). I have seens Al foil get compressed and it seems to gradually disintergrate into smaller pieces, but it seems it will take 6 weeks. Also a milling rpm of up to 120 will speed it up.

[willd]

does anybody know how its done commercially

[Stuart]

Its ground methinks

[phildunford]

Various ways I believe, depending on the type of ally you need (dark pryo, atomised, flake...)

They used to produce it in a stamp mill and I think there is still some that is produced that way. Atomised is produced (i think) by spraying the molton metal in an inert atmosphere. - all a bit complex to do at home!

[Pyromaster2003]

thought spherical Al was produced by spraying molting AL through a very fine mesh?

[Richard H]

thought spherical Al was produced by spraying molting AL through a very fine mesh?

Nope. That would be fairly useless and a very poor way to do it if you think about it. Spraying the molten aluminium through an inert gas however is the way it is done in industry. The molten metal cools very quickly to form sphere shaped particles which are then collected.

[PanMaster]

how do they make pyro aluminium? Do they crush it in a giant ball mill with steel balls that weigh half a tonne each or something?

[Richard H]

Probably in a large stamp mill. The best dark pyro powders get a coating of carbon instead of oxide IIRC.

[Mortartube]

This is probably something similar to the atomised aluminium process with an inert gas as opposed to compressed air.

http://www.metal-spr...nz/arc/arc.html


Keith

[Mortartube]

I also found this

http://www.vami.ru/p...oshki_pudri.htm

[PanMaster]

I read that pigment paints made in Anglesey are <10 microns on average