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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Overcoating metals
Praseodymium is surprisingly cheap for so strange an element ($200 or
so the kilo), and has an attractive greeny-blue patina; so casting decorative beads from it doesn't seem too absurdly ridiculous an idea (though it may emerge that the overlap between chemistry geeks and wearers of beaded jewellery is empty). It's a bit reactive, however; melting under argon doesn't seem _that_ impossible, but I don't think it would be at all safe to wear praseodymium next to the skin. Is there any standard way of getting a really durable transparent overcoating by basically physical means (IE mechanical rather than chemical adhesion)? I suppose whatever process is used to embed objects in lucite for commemorative plaques might work, but then you've got a lucite bead with a weird green-metal blob in the middle, rather than an apparently-metal bead. Tom (clearly doesn't know what he's letting himself in for) |
#2
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Thomas Womack wrote:
Praseodymium is surprisingly cheap for so strange an element ($200 or so the kilo), and has an attractive greeny-blue patina; so casting decorative beads from it doesn't seem too absurdly ridiculous an idea (though it may emerge that the overlap between chemistry geeks and wearers of beaded jewellery is empty). It's a bit reactive, however; melting under argon doesn't seem _that_ impossible, but I don't think it would be at all safe to wear praseodymium next to the skin. Is there any standard way of getting a really durable transparent overcoating by basically physical means (IE mechanical rather than chemical adhesion)? I suppose whatever process is used to embed Probably the easiest way is dipping in some sort of epoxy resin. However, to even approach 'really durable', you're looking at probably a millimeter of epoxy. If MP is low, you could pour it into a glass sphere - but then you wouldn't likely get a patina. |
#3
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"Thomas Womack" wrote in message
... Is there any standard way of getting a really durable transparent overcoating by basically physical means (IE mechanical rather than chemical adhesion)? I have no idea if this would work, but perhaps you could try clear powdercoating. - Michael |
#4
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Dipping in thinned shellac works for brass shrug
- - Rex B Thomas Womack wrote: Praseodymium is surprisingly cheap for so strange an element ($200 or so the kilo), and has an attractive greeny-blue patina; so casting decorative beads from it doesn't seem too absurdly ridiculous an idea (though it may emerge that the overlap between chemistry geeks and wearers of beaded jewellery is empty). It's a bit reactive, however; melting under argon doesn't seem _that_ impossible, but I don't think it would be at all safe to wear praseodymium next to the skin. Is there any standard way of getting a really durable transparent overcoating by basically physical means (IE mechanical rather than chemical adhesion)? I suppose whatever process is used to embed objects in lucite for commemorative plaques might work, but then you've got a lucite bead with a weird green-metal blob in the middle, rather than an apparently-metal bead. Tom (clearly doesn't know what he's letting himself in for) |
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