Moldable Iron Powder
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From: Joseph Gwinn on 2 Dec 2009 18:19 In article <M4zRm.70258$mn3.20394(a)en-nntp-03.dc1.easynews.com>, "Wild_Bill" <wb_wildbill(a)XSPAMyahoo.com> wrote: > I dunno about the ability to meet your requirements, but there are iron > powders available for various uses, from toys (Etch-A-Sketch), to industrial > uses.. electromagnetic clutches/brakes for machines. > These examples are moderately coarse powders. > > Very fine iron/steel particles are a byproduct of etching/cleaning or > pickling steel products in manufacturing. The steel parts are pickled in > various acids, and the particles which are suspended in the liquids are then > filtered to remove the particles from the acids. The result is a > mud/clay-like material that is used to manufacture other products, including > iron composition cores for certain magnetic properties. > > I don't have any sources to recommend. The finest iron powders are called "carbonyl iron" (http://en.wikipedia.org/wiki/Carbonyl_iron). Googling for carbonyl iron brought up this supplier: <http://www.chemicalstore.com/navigation/detail.asp?id=IRON100>. Joe Gwinn > WB > ......... > metalworking projects > www.kwagmire.com/metal_proj.html > > > "Tim Wescott" <tim(a)seemywebsite.com> wrote in message > news:hbmdnfVvIcn3SpfWnZ2dnUVZ_hj_fwAA(a)web-ster.com... > >A long-term back-burner project just got my attention when I found out > > that Home Depot sells magnetic paint. > > > > The project is a levitating globe thingie, designed as a control systems > > trainer that lets the student program the control rules in C and see how > > different control strategies lead to different sorts of system > > performance. > > > > The paint got me thinking -- if they can make latex paint with iron > > powder in it, can I buy some sort of plastic resin with iron powder in it > > and make my own custom magnetics on the cheap? > > > > So: does anyone know of an iron-powder/epoxy (or whatever) mix out there > > that you can buy, or an iron powder material that you can mix with your > > own resin to mold soft magnetic materials out of? > > > > I'm looking to build some cores, and maybe have some made at a low volume > > if the prototypes work. I do _not_ need super high permeability -- the > > air gap in this is so big that according to the FEA program I'm using > > there's not much difference between core material with a relative > > permeability in the hundreds vs. iron (with relative permeability in the > > thousands). > > > > Thanks. > > > > -- > > www.wescottdesign.com
From: steamer on 2 Dec 2009 20:00 --Hey speaking of doing stuff with metal powders have you seen Bathsheba's process description yet? http://www.bathsheba.com/sculpt/process/ -- "Steamboat Ed" Haas : Currently broke and Hacking the Trailing Edge! : looking for a job... www.nmpproducts.com ---Decks a-wash in a sea of words---
From: axolotl on 3 Dec 2009 18:41 Wild_Bill wrote: > I dunno about the ability to meet your requirements, but there are iron > powders available for various uses, from toys (Etch-A-Sketch), to > industrial uses.. electromagnetic clutches/brakes for machines. > These examples are moderately coarse powders. > > Very fine iron/steel particles are a byproduct of etching/cleaning or > pickling steel products in manufacturing. The steel parts are pickled in > various acids, and the particles which are suspended in the liquids are > then filtered to remove the particles from the acids. The result is a > mud/clay-like material that is used to manufacture other products, > including iron composition cores for certain magnetic properties. > > I don't have any sources to recommend. > Many years ago, the ferrite factory for which I worked used oxide from the steel mills as a raw material. I was told there were mountains of the stuff in West Virginia. To be usable for magnetics, the oxide would have to be fired in a cycle that included high temperatures and witchcraft. Kevin Gallimore
From: Martin H. Eastburn on 3 Dec 2009 23:06 Zone refine. Melted in a magnetic field and the field is moved slowly towards an end - moving impurities with it. Expensive refining but quality product. Similar to that of a semiconductor process. Likely from the ferrite business. Martin axolotl wrote: > Wild_Bill wrote: >> I dunno about the ability to meet your requirements, but there are >> iron powders available for various uses, from toys (Etch-A-Sketch), to >> industrial uses.. electromagnetic clutches/brakes for machines. >> These examples are moderately coarse powders. >> >> Very fine iron/steel particles are a byproduct of etching/cleaning or >> pickling steel products in manufacturing. The steel parts are pickled >> in various acids, and the particles which are suspended in the liquids >> are then filtered to remove the particles from the acids. The result >> is a mud/clay-like material that is used to manufacture other >> products, including iron composition cores for certain magnetic >> properties. >> >> I don't have any sources to recommend. >> > > > Many years ago, the ferrite factory for which I worked used oxide from > the steel mills as a raw material. I was told there were mountains of > the stuff in West Virginia. > To be usable for magnetics, the oxide would have to be fired in a cycle > that included high temperatures and witchcraft. > > Kevin Gallimore
From: amark on 4 Dec 2009 05:04
On Nov 24, 5:41 am, Tim Wescott <t...(a)seemywebsite.com> wrote: > A long-term back-burner project just got my attention when I found out > that Home Depot sells magnetic paint. > > The project is a levitating globe thingie, designed as a control systems > trainer that lets the student program the control rules in C and see how > different control strategies lead to different sorts of system > performance. > > The paint got me thinking -- if they can make latex paint with iron > powder in it, can I buy some sort of plastic resin with iron powder in it > and make my own custom magnetics on the cheap? > > So: does anyone know of an iron-powder/epoxy (or whatever) mix out there > that you can buy, or an iron powder material that you can mix with your > own resin to mold soft magnetic materials out of? > > I'm looking to build some cores, and maybe have some made at a low volume > if the prototypes work. I do _not_ need super high permeability -- the > air gap in this is so big that according to the FEA program I'm using > there's not much difference between core material with a relative > permeability in the hundreds vs. iron (with relative permeability in the > thousands). > > Thanks. > > --www.wescottdesign.com and a further reply - iron powders are used in spray-metal applications but at a price |