Difference between revisions of "Upgrade/RFFoil/WoodsMetal"
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Wood's contains cadmium and lead, and therefore is poisonous. However, there are a variety of alloys with similar low melting point. Not all of these are poisonous, for instance Field's metal. The latter is a lot more expensive, but that's probably not a problem since we don't need a whole lot of it. | Wood's contains cadmium and lead, and therefore is poisonous. However, there are a variety of alloys with similar low melting point. Not all of these are poisonous, for instance Field's metal. The latter is a lot more expensive, but that's probably not a problem since we don't need a whole lot of it. | ||
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| + | A few things that I found so far: | ||
| + | * non-toxic are field's metal (62 C) and cerrolow 136 *58 C) | ||
| + | * cerrosafe (74 C) is said to be specifically suitable for machining: this is probably because on solidification is first shrinks a little and then slowly expands again. after 1 our it has almost exactly the same size as in the molten state | ||
| + | * cerrobend (basically Wood's metal) expands on solidification by about a factor 1.006 | ||
| + | * solid field's metal has a thermal expansion coefficient that is very close to Aluminum (22 x 10^-6) | ||
== Where to buy == | == Where to buy == | ||
Revision as of 12:21, 23 September 2014
Wood's metal is an allay with a low melting point, about 60 degrees C. A lot of information on Woods metal can just be found on WikiPedia:
http://en.wikipedia.org/wiki/Wood%27s_metal
Wood's contains cadmium and lead, and therefore is poisonous. However, there are a variety of alloys with similar low melting point. Not all of these are poisonous, for instance Field's metal. The latter is a lot more expensive, but that's probably not a problem since we don't need a whole lot of it.
A few things that I found so far:
- non-toxic are field's metal (62 C) and cerrolow 136 *58 C)
- cerrosafe (74 C) is said to be specifically suitable for machining: this is probably because on solidification is first shrinks a little and then slowly expands again. after 1 our it has almost exactly the same size as in the molten state
- cerrobend (basically Wood's metal) expands on solidification by about a factor 1.006
- solid field's metal has a thermal expansion coefficient that is very close to Aluminum (22 x 10^-6)
Where to buy
Wood's metal is sometimes sold under the name 'Cerrobend'. Mari form VDL pointed us to these companies:
- http://www.hitechalloys.com/hitechalloys_002.htm
- http://www.boltonmetalproducts.com/Specifications.html
- http://www.lowdenlimited.co.uk/
For Field's metal I found this company:
http://www.rotometals.com/SearchResults.asp?Search=fields+metal