Ceramic Magnets and their durability in temperature fluctuations

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Discussion Overview

The discussion revolves around the durability of ceramic (ferrite) magnets in environments with extreme temperature fluctuations, specifically focusing on the effects of transitioning between -40° C and +20° C over extended periods. The inquiry seeks to understand the mechanisms behind potential strength loss in these magnets under such conditions.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant notes that while permanent magnets generally become stronger at extremely low temperatures, the repeated cycling from -40° C to +20° C might lead to a gradual decrease in strength over time.
  • Another participant inquires about the specific type of ceramic, confirming it is ferrite.
  • A later reply suggests that the coercive field of some ferrites may significantly decrease at low temperatures, potentially making the magnet more susceptible to demagnetization from weak external fields.

Areas of Agreement / Disagreement

Participants express varying viewpoints on the effects of temperature fluctuations on ferrite magnets, with no consensus reached on the overall impact of these conditions on magnet strength.

Contextual Notes

The discussion highlights the need for further clarification on the specific properties of the ferrite material in question and the potential influence of external magnetic fields during temperature changes.

bluerayz
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I work in the Aggregate industry and we use ceramic magnets to pull ferrous materials out of the feed of Aggregate materials passing by on a conveyor belt.
So i have a basic knowledge about how they work, but my technical knowledge about magents is extremely lacking.

Wondering if anyone would have any theories as to why a ceramic permanent magnet would lose its strength working in a place with extremely cold temparatures? I.E. -40° C.
I know that permanent magnets become stronger when they are put in extremely cold temps, but I'm wondering if going from -40 to +20 every 24 hours for months in a row might gradually decrease the strength over time??

Any thoughts would be helpful. Thanx in advance.
 
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What kind of ceramic? Is it a ferrite?
 
It is Ferrite.
 
The values of the coercive field of some ferrites may decrease significantly at low temperature. This will make the magnet more sensitive to weak external fields, which may demagnetize it or reduce its magnetization.
 

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