Finding really dense metals

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Subject Author Date
Finding really dense metals Tim Shoppa 04-23-2008
Posted by Tim Shoppa on April 23, 2008, 1:13 pm
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On Apr 23, 12:05=A0pm, Spehro Pefhany
> On Wed, 23 Apr 2008 08:23:23 -0700 (PDT), the renowned Tim Shoppa
>
>
>
>
>
> >> Tungsten has a *really* high melting point (6192?=B0F), and uranium is =
pretty
> >> high as well (2070=B0F). =A0In anything, you'd need a chunk large enoug=
h to
> >> machine down to size.
>
> >Again, I was hoping to get some random scrap that could go into a can
> >or bucket pretty densely.
>
> >>=A0What's your price range on this project?
>
> >Don't want to pay too much more than lead, but I'll pay a little more.
> >Lead scrap sold for fishing weights at the junkyard seems to be $2 a
> >pound, and I'd pay more for denser metals than lead, so max price I'd
> >like to pay for 20 pounds of denser stuff would be circa very low
> >hundreds of $.
>
> >Like I said, I am looking for scrap, not machining down from billet!
> >With scrap I could contemplate trying to pack it all into a little
> >pint-size can, without having to melt it down or do too much cutting.
>
> >Tim.
>
> Maybe some junk tungsten carbide bits cast into a Pb matrix?
>
> 15.6 g/cm^3 for tunsten carbide
> 11.3 g/cm^3 for lead

Ahah, that starts to sound like a good possibility!

Where could I find 15 or 20 pounds worth of junk tungsten carbide bits
for cheap?

Tim.

Posted by Ned Simmons on April 23, 2008, 5:20 pm
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On Wed, 23 Apr 2008 10:13:07 -0700 (PDT), Tim Shoppa

>
>Where could I find 15 or 20 pounds worth of junk tungsten carbide bits
>for cheap?

I don't think you will. I was offered $11/lb for tungsten carbide
scrap last week. I'd expect tungsten metal scrap would sell for at
least twice that.

(This week I've been designing a heat treat fixture that'll be made of
tungsten.)

--
Ned Simmons

Posted by Jim Wilkins on April 23, 2008, 9:25 pm
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> Where could I find 15 or 20 pounds worth of junk tungsten carbide bits
> for cheap?
> Tim

I see you are also looking for large ceramic insulators. What are you
making?

Posted by Don Foreman on April 23, 2008, 2:27 pm
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On Wed, 23 Apr 2008 12:05:58 -0400, Spehro Pefhany

>On Wed, 23 Apr 2008 08:23:23 -0700 (PDT), the renowned Tim Shoppa
>
>>> Tungsten has a *really* high melting point (6192?°F), and uranium is pretty
>>> high as well (2070°F).  In anything, you'd need a chunk large enough to
>>> machine down to size.
>>
>>Again, I was hoping to get some random scrap that could go into a can
>>or bucket pretty densely.
>>
>>> What's your price range on this project?
>>
>>Don't want to pay too much more than lead, but I'll pay a little more.
>>Lead scrap sold for fishing weights at the junkyard seems to be $2 a
>>pound, and I'd pay more for denser metals than lead, so max price I'd
>>like to pay for 20 pounds of denser stuff would be circa very low
>>hundreds of $.
>>
>>Like I said, I am looking for scrap, not machining down from billet!
>>With scrap I could contemplate trying to pack it all into a little
>>pint-size can, without having to melt it down or do too much cutting.
>>
>>Tim.
>
>Maybe some junk tungsten carbide bits cast into a Pb matrix?
>
>15.6 g/cm^3 for tunsten carbide
>11.3 g/cm^3 for lead

>Spehro Pefhany

Clever!

Posted by Pete Snell on April 23, 2008, 4:32 pm
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Spehro Pefhany wrote:

>
> Maybe some junk tungsten carbide bits cast into a Pb matrix?
>
> 15.6 g/cm^3 for tunsten carbide
> 11.3 g/cm^3 for lead

Throw in a few Tungsten TIG electrodes for the small spaces. Pure
tungsten electrodes have fallen from favour, so you might find some cheap.

Pete

--
Pete Snell
Department of Physics
Royal Military College
Snell-p@rmc.ca
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