36 replies to this topic

[pyroman89]

What is the black stuff you put on at the end?

thank you

[sasman]

The magnalium crud i scrape of is just oxide ? i didnt use a flux because didnt want to contaminate the magnalium with any other chemical..the black stuff is plain carbon ..

[EnigmaticBiker]

thanks i'll treat myself to a bit of mag type car,bike parts off ebay

It does work, producing brighter sparks than Al.
It adds strength to die cast and injection moulded components. Very roughly speaking the tougher, more brittle and more easily it corrodes, the higher the more Mg content. Bike casings are tough to mill though.

Amongst other posts:-
http://www.pyrosocie.......cycle&st=15

A slow rotary file lubed with linseed oil produced enough chips to test out.
Mill with stainless steel or harder heavier media.

If you want some I've probably got some bits lying around the workshop.

[Bonny]

The magnalium crud i scrape of is just oxide ? i didnt use a flux because didnt want to contaminate the magnalium with any other chemical..the black stuff is plain carbon ..

I save the black crud scraped off the top as it usually contains some metal. I have limited supply of Mg, so I try to use all I can. I have successfully used the "crud" in fountains several times. I know actual Magnalium works better, but still get some good sparks using up the waste. Makes fountains a little easier on the resources...

[Wyvern]

I wonder, instead of using gas powered torches etc to melt the metals maybe this could work http://www.richiebur...uk/indheat.html

I may well consider building one of these

[Arthur Brown]

Yes that's how proper vacuum induction furnaces work! They use a carbon crucible with a frangible disc in the base. The atmosphere is purged of air then either evacuated or filled with a suitable gas (argon helium etc.) then the power is turned on. The heating caries on to the required temperature because of the eddy currents in the carbon of the crucible. After the melt is complete the frangible disc is broken by a remote hammer and the melt pours into moulds.

NOTE two things

1/ that reference does not give the critical bit! the RF driver circuit.

2/ molten metal kills it's HOT and any moisture explodes.

Added: I think magnesium is available from plumbing and boat shops as sacrificial anodes for corrosion inhibition, that will be a cheap source or pure Mg!

Edited by Arthur Brown, 13 September 2007 - 02:18 PM.

[FrankRizzo]

Read this thread:

http://www.apcforum....s...nalium&st=0