Our other sites:

How are samarium cobalt (SmCo)
magnets manufactured?

Shop for Magnets

Samarium cobalt SmCo internal threaded female pot magnet Samarium cobalt magnets are made from an alloy of samarium and cobalt. To create SmCo magnets, manufacturers usually follow these steps:
Strip casting samarium cobalt magnet

Step 1 – Strip casting

First, the two materials are ground up and melted in a large oven at 14426.7°C (26000°F). When they are cool, the metals are all mixed together to create small chips.

Wonkee Donkee says "Strip casting is the name given to heating up a group of different metals until they are molten and then cooling them down together into a solid"
Ball milling making magnet powder

Step 2 – Milling

The small chips of metal compound are ground down to a fine powder and mixed together thoroughly in a ball mill.

Moulds for different shaped magnets

Step 3 – Moulding

The powder is then weighed and pressed into the moulds, which can be any shape of magnet.

Pressing machine

Step 4 – Pressing

The moulds are placed into a pressing machine which places a total of 21000psi of pressure onto them.

Wonkee Donkee says "Psi stands for the amount of pressure there is per square inch inside the machine"
Time

Step 5 – Sintering

The shaped metal is then placed into an electric oven, which heats the metal compound gradually from 250°C (482°F) to 900°C (1652°F).

Extremely hot thermometer The magnets can take from 20 to 36 hours to be heated depending on the quality of the end magnet. A top quality magnet will take a lot longer in the oven than a low quality one, as a slower temperature rise will produce a greater magnetic force.

For more information on sintering, see the Magnets glossary

Electrical discharge machine

Step 6 – Machining

After the magnets have been removed from the oven and left to cool, they are ground down to the correct size. A diamond-coated machine takes off millimetres of metal until the required size is achieved.

Flowing water They need to be machined with a constant flow of water due to the heat created in the machining process.
Samarium cobalt SmCo internal threaded female pot magnet

Step 7 – Coating

The magnets are then coated to prevent them from oxidising.

For more information on the types of plating and coatings, see the page: What are magnets coated with?

Magnetising

Step 8 – Magnetising

Finally, the alloy is magnetised. A magnetising machine envelops the magnet in a high strength magnetic field by sending 2400 volts of electrical current through it to create a permanent samarium cobalt magnet.

Call Now Button