Rare earth magnets are used almost everywhere in our daily life. Rare earth magnets are used extensively, especially in household appliances.
Rare earth magnets are permanent magnets. So, are these permanent magnets different from other magnets?
Rare Earth Magnets From Past to Present
Rare-earth magnets, which are permanent magnets, were developed by men at the United States Air Force Materials Laboratory. During their research, they discovered that an alloy has very high magnetic anisotropy. They called this alloy, which is hard to find, a rare earth magnet.
Magnets were actually as abundant and comfortable as Iron or Gold. However, the main source of rare earth magnets was located in China. Today, still the highest quality rare earth magnets come from China.
After the magnet’s raw material reaches the manufacturer, it is pulverized. Then other necessary materials are mixed with this powder. The content, class and magnetic properties of the magnet, which will appear according to the properties of the raw materials and other materials used, differ.
The powder obtained mixture is pressed according to the desired form and then aligned using a large electromagnet. After the alignment process, sintering is performed. Then the obtained material is cut to the desired dimensions and shape. After cutting, a coating is performed to protect the magnet. The magnet obtained by this coating is protected from corrosion.
In the production of rare earth magnets, different powders and materials are used than the production of other magnets. Therefore, the quality and strength of these magnets are different. BHMax is used to measure the magnetic fields of magnets. For example; ceramic magnets have 3.5 BHMax, while rare earth magnets have 40 BHMax.
Another factor affecting the quality of magnets is temperature. As the temperature increases, the magnetism of the magnets will decrease. Ceramic magnets are resistant up to 460 degrees, while rare earth magnets have a resistance up to 750 degrees.
Rare earth magnets are resistant to corrosion. The most preferred rare earth magnet is the Neodymium magnet. But Neodymium magnets are also extremely fragile. In addition, the production of Neodymium magnet is extremely difficult.
If you have difficulty deciding in what form, which size and which coating you need a rare earth magnet, we recommend that you seek advice from a manufacturing company.