<p>The melting temperature of a magnet is irrelevant because it loses it's magnetation long before melting.</p>

<p>Have a look at <a href="https://www.supermagnete.de/eng/data_table.php" rel="noreferrer">this site</a> and you'll see that the maximum working temperature of neodymium magnets is approx. 230°C for the <strong>most</strong> heat resistant magnets. <a href="https://www.supermagnete.de/eng/faq/What-temperatures-can-magnets-sustain" rel="noreferrer">This site</a> explains why the magnets get permanently demagnetized by heat.</p>

<p>The only way to embed a magnet into aluminum and keep it intact is to prepare a cavity in the aluminum and insert the magnet later (when the metal cooled down to working temperature). If you want to coat the magnet, either use <a href="https://sciencing.com/galvanize-aluminum-8664634.html" rel="noreferrer">galvanization</a> or a different material.</p>

CC BY-SA 4.0
2019-05-17T08:32:25.460Z
With a close fit and degreased parts, epoxy works very well on the (nickel) plating if you glue the magnet into a recess
Chris H
CC BY-SA 4.0
2019-05-15T07:15:00.337Z
2019-05-15T16:07:15.437Z
2019-05-15T16:07:15.437Z
Elmy
<p>Neodymium magnets are magnetized post forming and plating, or so claims <a href="https://www.kjmagnetics.com/blog.asp?p=how-neodymium-magnets-are-made" rel="nofollow noreferrer">this</a> magnet manufacturer.  If the magnet is permanently demagnetized, you could try to remagnetize it with a coil and high-current capacitor bank.  There may be some interference from current induced in the aluminum, which may be addressable by using a longer current pulse.</p>

<p>First I would try heating the magnet in question to the temperature where aluminum melts, perhaps by pressing a ball of aluminum foil around the magnet and heating it in a cast iron pan.  The foil will monitor the temperature, and touching/moving the magnet during the process will show you the demagnetization properties.</p>

<p>You are casting the aluminum around the magnet.  If the aluminum is thin enough, it may be that the temperature of the magnet never reaches the critical temperature.</p>

<p>Since Aluminum had no grain structure (like wood), it may be best to cut the rod, create a cavity, polish the ends, glue it all together, and then turn and polish the rod on a lathe to remove any discontinuity from the cut.  Carefully cut, polished, glued, and finished, the break in the aluminum rod could be nearly invisible.</p>

CC BY-SA 4.0
2019-05-17T15:41:03.160Z
2019-05-17T15:41:03.160Z
cmm
<p>I want to embed a rare earth magnet inside some aluminum. Think of it like an aluminum rod that has a thin layer of Al at one end, and underneath is the rare earth magnet.</p>

<p>Al melts at 660C. At what temp does neodymium melt at? Is there a magnetic material that has a higher melting point that I can embed in the Al?</p>

<metalworking>
Embedding a neodymium magnet inside a forged/melted aluminum enclosure
jonnyd42
# Embedding a neodymium magnet inside a forged/melted aluminum enclosure

(Asked by: username_0 on 2019-05-15)

I want to embed a rare earth magnet inside some aluminum. Think of it like an aluminum rod that has a thin layer of Al at one end, and underneath is the rare earth magnet.

Al melts at 660C. At what temp does neodymium melt at? Is there a magnetic material that has a higher melting point that I can embed in the Al?

**Tags:** metalworking


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## 2 answers

### Answer by username_1 on 2019-05-15. Score: 8

The melting temperature of a magnet is irrelevant because it loses it's magnetation long before melting.

Have a look at [this site](https://www.supermagnete.de/eng/data_table.php) and you'll see that the maximum working temperature of neodymium magnets is approx. 230°C for the **most** heat resistant magnets. [This site](https://www.supermagnete.de/eng/faq/What-temperatures-can-magnets-sustain) explains why the magnets get permanently demagnetized by heat.

The only way to embed a magnet into aluminum and keep it intact is to prepare a cavity in the aluminum and insert the magnet later (when the metal cooled down to working temperature). If you want to coat the magnet, either use [galvanization](https://sciencing.com/galvanize-aluminum-8664634.html) or a different material.

> **Comments:**
> **username_2**: With a close fit and degreased parts, epoxy works very well on the (nickel) plating if you glue the magnet into a recess  

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### Answer by username_3 on 2019-05-17. Score: 1

Neodymium magnets are magnetized post forming and plating, or so claims [this](https://www.kjmagnetics.com/blog.asp?p=how-neodymium-magnets-are-made) magnet manufacturer. If the magnet is permanently demagnetized, you could try to remagnetize it with a coil and high-current capacitor bank. There may be some interference from current induced in the aluminum, which may be addressable by using a longer current pulse.

First I would try heating the magnet in question to the temperature where aluminum melts, perhaps by pressing a ball of aluminum foil around the magnet and heating it in a cast iron pan. The foil will monitor the temperature, and touching/moving the magnet during the process will show you the demagnetization properties.

You are casting the aluminum around the magnet. If the aluminum is thin enough, it may be that the temperature of the magnet never reaches the critical temperature.

Since Aluminum had no grain structure (like wood), it may be best to cut the rod, create a cavity, polish the ends, glue it all together, and then turn and polish the rod on a lathe to remove any discontinuity from the cut. Carefully cut, polished, glued, and finished, the break in the aluminum rod could be nearly invisible.


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