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Author: Subject: Metal Shot Heating Bath
Funkerman23
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[*] posted on 15-2-2016 at 20:33


Quote: Originally posted by subsecret  
How about copper turnings/filings? They're a little expensive, though.

Take solid copper wire, and cut it into segments The smaller the better.

http://www.ebay.com/itm/PURE-COPPER-FILINGS-6-LB-BULK-BOX-GR...
SOnner or later I need to find the formulas that's convert weight to approximate volume... This isn't the first time I've wondered about it but too many irons, not enough fire.

EDIT: JJay was right and I feel dumb.. Well better to be dumb for a moment and learn then carry on being an idiot. Thanks!

[Edited on 16-2-2016 by Funkerman23]




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JJay
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[*] posted on 15-2-2016 at 21:41


Quote: Originally posted by Funkerman23  
Quote: Originally posted by subsecret  
How about copper turnings/filings? They're a little expensive, though.

Take solid copper wire, and cut it into segments The smaller the better.

http://www.ebay.com/itm/PURE-COPPER-FILINGS-6-LB-BULK-BOX-GR...
SOnner or later I need to find the formulas that's convert weight to approximate volume... This isn't the first time I've wondered about it but too many irons, not enough fire.


Huh? You use the specific gravity (density) of the material, which is specified in something like grams per cubic centimeter. You can also account for empty space by multiplying by (100% - empty space %). This is elementary school math.

[Edited on 16-2-2016 by JJay]
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gsd
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[*] posted on 16-2-2016 at 02:58


I am surprised that nobody has come up with "Woods Metal Heating alloy".

I came across it while searching for a patent on NaBH4 (US 2898184).

Wood's metal, also known as Lipowitz's alloy or by the commercial names Cerrobend, Bendalloy, Pewtalloy and MCP 158, is a eutectic, fusible alloy with a melting point of approximately 70 °C (158 °F). It is a eutectic alloy of 50% bismuth, 26.7% lead, 13.3% tin, and 10% cadmium by weight. The alloy is named for Barnabas Wood.

Given that this is a cocktail of "shunned" metals, I wonder will anybody here be inclined to "assemble" it.

https://en.wikipedia.org/wiki/Wood%27s_metal

gsd
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XeonTheMGPony
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[*] posted on 16-2-2016 at 03:35


I like my liver and kidneys too much to be bothered going any where near Cadnium in elimental form or its oxides.
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careysub
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[*] posted on 16-2-2016 at 04:11


Quote: Originally posted by Funkerman23  

...
SOnner or later I need to find the formulas that's convert weight to approximate volume... This isn't the first time I've wondered about it but too many irons, not enough fire.

EDIT: JJay was right and I feel dumb.. Well better to be dumb for a moment and learn then carry on being an idiot. Thanks!

[Edited on 16-2-2016 by Funkerman23]


You could read this very thread where I do these calculations, giving both the input data and the result.

[Edited on 16-2-2016 by careysub]
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[*] posted on 16-2-2016 at 04:43


Quote: Originally posted by JJay  
$10 per pound for copper is just outrageous.


Over the last year the metal market price for copper has fluctuated between $2 and $3 a pound. This is a bulk market price.

If you buy copper (or any metal) in small quantities as a consumer that has been processed in some manner (like powdering, or shotting) you would normally expect to pay a few times the metal market price, or close to $10 a pound (at that price you can get shipping included). The cheapest source I know of for pure copper is Rotometals at $9/lb. This is a reasonable price for the pure metal.

Copper pennies, if you can acquire them at face value, are $1.46/lb, but aren't pure copper, they are an alloy that is 95% copper. But this is an historical anomaly and resulted in a special regulation being issued by the Treasury making melting bulk pennies down illegal to prevent them from being swept out of the circulating currency.
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careysub
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[*] posted on 16-2-2016 at 05:00


Quote: Originally posted by gsd  
I am surprised that nobody has come up with "Woods Metal Heating alloy".


On this very thread I discuss Rose's metal, which has an mp of 98 C (vs 70 C for Wood's metal).

Two problems with Wood's metal:

1. Cadmium is a toxic, volatile metal. Cadmium's vapor pressure reaches 0.1% atm Pressure at 380C, it reaches 1% at 470 C.

2. Wood's metal costs $340/L (same as the much safer cadmium-free Rose's metal).

The 28C lower melting point for Wood's metal is not worth the toxic cadmium fumes.

For comparison (repeating the computations I made up-thread for convenience) the other metal baths discussed cost:
Aluminum pellets (from eBay seller handi-ramp510 ): $23/L
Lab Armor beads: $100/L
Copper powder: $178/L
Aluminum pellet and copper powder: $85/L
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[*] posted on 19-2-2016 at 21:01


What about cutting up fine steel wool? It would rust and wouldn't be compatible with magnetic stirring, but if you cut it finely enough, it would provide great heat transfer. Use 0000 grade.



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[*] posted on 20-2-2016 at 00:06


They also sell copper scrubbing pads... they aren't as fine but I think they would work well too. That could get expensive, though.
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