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4hv.org :: Forums :: General Science and Electronics
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Ferrite core maximum temperature

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Dr. Dark Current
Thu May 15 2008, 03:21PM Print
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
How hot can a ferrite core get before it is damaged/cracks/loses its magnetic properties?




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Backyard Skunkworks
Fri May 16 2008, 12:03AM
Backyard Skunkworks Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
I think around 450C, however most ferrite magnets say not to go above 250C to prevent damage.
By the time the core gets that hot you've got other issues anyway...
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Finn Hammer
Sat May 17 2008, 04:30PM
Finn Hammer Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Dr. Monsterarc wrote ...

How hot can a ferrite core get before it is damaged/cracks/loses its magnetic properties?

Depends on the material.

Effective permeability and saturation flux density changes dictates, that you don`t want to go much higher than 100degC with most ferrites.

For a good read:
Link2

Cheers, Finn Hammer
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Dr. Dark Current
Sat May 17 2008, 05:18PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Finn Hammer wrote ...

Depends on the material.

Effective permeability and saturation flux density changes dictates, that you don`t want to go much higher than 100degC with most ferrites.

For a good read:
Link2

Cheers, Finn Hammer

thanks Finn, that is a drastic drop in permeability above 120C... I didn't know it was that dramatic, after my inverter explodes next time and my core will be too hot, I'll know!



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