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# Re: [FEMM] alnico5 versus ceramic5 ?

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- Subject: Re: [FEMM] alnico5 versus ceramic5 ?
- From: "Antonio F.R. Carabio" <ingacarabio@fibertel.com.ar>
- Date: Mon, 26 Jan 2004 11:28:18 -0300
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- References: <000801c3e39c$a47043d0$6500a8c0@bengt> <6.0.0.22.0.20040126130551.02626818@staff-mailin.lboro.ac.uk>
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Information about ceramic magnets at http://www.bunting-magnetics.com/magnets/ceramic.cfm Best regards Ing. Antonio F.R. CARABIO ingacarabio@fibertel.com.ar Jaramillo 1610. 6° B (1429) BUENOS AIRES 4703-3242 ----- Mensaje original ----- De: Keith Gregory Para: FEMM mailing list Enviado: lunes, 26 de enero de 2004 10:16 Asunto: Re: [FEMM] alnico5 versus ceramic5 ? Bengt, Alnico 5 and Ceramic 5 are entirely different materials. Alnico is an aluminium-nickel-cobalt alloy (one of the earliest real permanent magnet materials) and doesn't have a particularly big coercive force (I think alnico5 in Femm has Hc of about 50,000A/m), will operate at up to about 1.2 Tesla and is electrically conductive. Ceramic 5 is a hard ferrite made from stuff like Barium and Strontium (I will admit I don't know exactly) and has a coercive force about four times that of alnico; it will operate only up to about 0.4T but is non-conductive. You will get a dramatic difference between the two materials in most applications. Keith. At 23:40 25/01/2004, you wrote: Hello. I wanna start with the fact that I realy like this program. I have had a lot of use for it when simulating magnetic structures for a ribbon speaker (tweeter). I have used the "Alnico5" too work as a ferritmagnet when I didn't find one in the library (didn't look at the bottom). Now I have found it and I was very surprised that the magnetic force increased when I replased the alnico5 with the "ceramic5". I'm using version3.3 build 30/3-03 Best regards. Dahlberg _______________________________________________ FEMM mailing list FEMM@list.foster-miller.net http://femm.foster-miller.net/mailman/listinfo/femm _______________________________________________ FEMM mailing list FEMM@list.foster-miller.net http://femm.foster-miller.net/mailman/listinfo/femm

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  - [FEMM] alnico5 versus ceramic5 ?
    - From: "Bengt Dahlberg" <d.bengt@bredband.net>
  - Re: [FEMM] alnico5 versus ceramic5 ?
    - From: Keith Gregory <K.Gregory@lboro.ac.uk>

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