Posted 12 January 2004 - 09:30 AM
Posted 12 January 2004 - 06:32 PM
Posted 12 January 2004 - 08:38 PM
I wonder if pure Mg would work, or would it be too reactive?
Posted 12 January 2004 - 08:39 PM
Posted 12 January 2004 - 10:03 PM
OTOH, aren't power too housings sometimes made from Mg or MgAl? If it was pure Mg, it's clearly just a matter of alloying it with some Al. I suppose If the housing was a MgAl alloy it would not be a brittle one and you'd have to do some alloying yourself. I'll definately take a look next time I'm shopping at the tip.
Edited by Phoenix, 12 January 2004 - 10:03 PM.
Posted 13 January 2004 - 10:54 PM
not tried them myself but this companay do a .3kg one for ?15.
Go to their on-line shop and search for magnesium. - can't deep link 'cos it's a database.
Should think any decent sized ships chandlers would do these...
Posted 15 January 2004 - 07:02 AM
It depends on the alloy. The 50:50 alloy is quite hard and brittle and can be broken up with a hammer or even a mortar and pestle (better to use an iron one if you have one, say an iron pot and bar). It is easy to break up 50:50 MgAl into -60 mesh is just a few minutes, a ball mill with ball bearings will do lots to -200 mesh in only an hour or so.
Is MgAl soft? I couldnt imagin it being harder than Al as the Al and Mg atoms are similar sizes
Posted 19 January 2004 - 11:30 AM
Iron oxide and Al friction sensitive? i thought they were pretty hard to set off, unless you are thinking of the same mix as i am which involves some sort of burning mix along with iron oxide and al, which crackles (although not as impressivly as proper lead/magnalium microstars)
Leadoxide or bismuthoxide are surely the safest. But they are friction sesitive in the same way like Fe(III)O and Al are.
Please enlighten me
p.s. I'll grab that (Fe2O3/Al crackle) formula and post it as soon as the internet works again at home and i've got my formulas to hand.
Posted 19 January 2004 - 02:53 PM
Red iron aliminium composition
Al (fine flake) 45%
Red iron oxide 55
Minium 80% (does he mean minimum maby?)
Please note these compositions, esecially the red thermit, are a little sensitive to friction.
I have tried making the Red iron aliminium composition using talcum iron(III)oxide and atomised Al. This was really hard to ignite just like flash made from Atomised Al !
When using 25micron Al flake the friction sensitivity hightens for sure but how much I don?t know. You have probably nothing to fear...
Posted 19 January 2004 - 03:55 PM
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