Moldable Iron Powder
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From: Tim Wescott on 23 Nov 2009 13:41 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: PeterD on 23 Nov 2009 13:55 On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott <tim(a)seemywebsite.com> wrote: >A long-term back-burner project just got my attention when I found out >that Home Depot sells magnetic paint. > Interesting! What is it called, and is there a web reference?
From: Jim Stewart on 23 Nov 2009 14:07 Tim Wescott 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? Don't know about the power, but I've used these people for sample cores. Fast service and good product. They might be able to find you some powder. https://www.amidoncorp.com/
From: Tim Wescott on 23 Nov 2009 14:35 On Mon, 23 Nov 2009 13:55:37 -0500, PeterD wrote: > On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott <tim(a)seemywebsite.com> > wrote: > >>A long-term back-burner project just got my attention when I found out >>that Home Depot sells magnetic paint. >> >> > Interesting! What is it called, and is there a web reference? Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites should get you there. -- www.wescottdesign.com
From: jeff on 23 Nov 2009 14:52
Hi Tim, There are a lot of iron filled epoxies out there. Two names that come to mind immediately are Moglice and Devcon. I recall Dave Trumper at MIT had a nice mag-lev demo that used a photocell as feedback. -- Jeff Lowe TTim Wescott 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. > |