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  • Loss of Magnetism over heating.

    Discussion in 'The main mechanical design forum' started by azeeco, Sep 11, 2012.

    1. azeeco

      azeeco New Member

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      It is a fact that permanent magnet loose its magnetic properties on heating. I want to weaken the magnet by heating. is it possible? if so will any of you provide me details. do you have any graph that can help.

      Regards
      Aziz Rahman
       
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    3. Jonathan J

      Jonathan J Member

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      It looses it's magnetic strength when heated above its curie temperature. For how much it depends on the magnet material and grade.

      Example:
      NdFeB (steep loss with rising temp)
      Alnico (Little change with temp)

      I have a chart for several materials, but I do not know how to post a pict yet. (Sorry)

      You may be able to find info on the web at magnet manufactured websites:

      http://www.kjmagnetics.com/bhcurves.asp

      If you are unsure of you magnet material, you may have better luck changing the magnetic circut. (ie. changing the flux path by adding a piece of iron, or changing the gap)

      Hope that helps.
       

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