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Reply by DannyB

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Posted on Is it safe to drill out a rare earth magnet?

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DannyB

46 posts in 2023 days


#1 posted 608 days ago

@EEngineer

Actually, magnets don’t begin to permanently lose their magnetism until they hit at least the curie temperature.
The curie temperature is actually the point at which all magnetism is lost but it can still be remagnetized (IE irreversible but recoverable). Somewhere above that, you get permanent losses.

See http://www.magmamagnets.com/permanent-magnet-stability and such.

However, between the max operating temperature, and the curie temperature, you get irreversible but recoverable losses. That is, if you cool it back to room temperature, it will have lost some magnetism, but it could be remagnetized back to normal.

The max operating temperature of neodymium magnets depends on the grade (and it’s a curve rather than a single point), but even for the highest grade of neodymium magnets, the max op temp is only ~130 celsius. My heat gun can easily produce that temp.


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