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Bert
Super Administrator
Posts: 2821
Registered: 12-3-2004
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Mood: " I think we are all going to die. I think that love is an illusion. We are flawed, my darling".
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As a teen, I used several rolls of the USA 5 cent pieces- "Nickels". They are made of a 75:25 Cu:Ni alloy, since 1946. Non sparking and very slow to
wear away with mill charges of Potassium nitrate, charcoal & Sulfur-
They worked quite well, and you can always rinse them off and take them back to the bank for a full refund in "folding money" if you get some better
media later!
Or just keep them, they're worth more as metal than the face value lately. US is considering replacing the material with stainless steel soon, or just
doing away with one and five cent coins. Isn't inflation grand?
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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greenlight
National Hazard
Posts: 753
Registered: 3-11-2014
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Mood: Energetic
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Coins? I never thought of using them.
Coins here have the same composition; 75:25 Cu/Ni alloy.
I might throw some in with my lead sinkers next time and see how they go.
Be good, otherwise be good at it 
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ecos
Hazard to Others
Posts: 464
Registered: 6-3-2014
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Mood: Learning !
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Thanks all ,
I plan to grind Aluminium to fine powder. maybe chlorate in the future.
I tried to order the 400 series but it the shipping would cost me a lot since I am located in Europe , shipping = $135 !
I found some balls made of lead and others from SS but none from ceramic !
would the lead be better or the SS balls ? i have difference sizes 15 mm and 12 mm diameters.
I was searching for 20 mm diameter but it would take time in the order
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Bert
Super Administrator
Posts: 2821
Registered: 12-3-2004
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Mood: " I think we are all going to die. I think that love is an illusion. We are flawed, my darling".
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One man's opinion (And I have lived over 40 years doing this).
If you wish to grind Aluminum, SS is first choice, ceramic second, do not use Lead.
If you wish to grind chlorates or perchlorates, or Sr/Ba nitrates, or just about any other organic/inorganic chemical for colored stars, use ceramic.
HARD Lead alloys, such as water quenched 92Pb:6Sb:2Sn or brass will work for black powder- DO NOT use brass or a Copper alloy with ammonium nitrate or
ammonium perchlorate, Cu catalyzes decomposition.
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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hissingnoise
International Hazard
Posts: 3940
Registered: 26-12-2002
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Mood: Pulverulescent!
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| Quote: | | If you wish to grind Aluminum, SS is first choice, ceramic second, do not use Lead. |
I have ground thin, aluminium foil using AH lead Bert, and it worked out fine (pardon?)?
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Bert
Super Administrator
Posts: 2821
Registered: 12-3-2004
Member Is Offline
Mood: " I think we are all going to die. I think that love is an illusion. We are flawed, my darling".
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Aluminum foil gets work hardened during ball milling, the comminution has much to do with work hardening/embrittlement. Yes, Lead media may work- But
substantial Lead will end up in your milled powder. Maybe acceptable for your process, maybe not for some others.
Lead, and most of the commonly available quench hardening Lead alloys such as wheel weight metal, Linotype & etc. work SOFTEN. That is, as you're
smacking that Aluminum with your lead chunks, the Aluminum grows HARDER. And the Lead surface grows SOFTER. Call me a perfectionist, but this seems
like something to avoid?
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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