Neodymjärnborat

Neodymjärnborat, also known as NdFeB, is a type of permanent magnet made from an alloy of neodymium, iron, and boron. It is the most powerful type of permanent magnet commercially available. The exact composition and manufacturing process can vary, but a common stoichiometry is Nd2Fe14B. These magnets are characterized by their high coercivity, remanence, and maximum energy product, making them suitable for applications requiring strong magnetic fields in a compact size.

The production of neodymjärnborat magnets typically involves powder metallurgy. The raw materials are melted together, cast into ingots, and then ground into a fine powder. This powder is pressed into a mold and sintered at high temperatures. Subsequent steps include machining and magnetization. The manufacturing process is complex and requires careful control of the composition and microstructure to achieve optimal magnetic properties.

Due to their exceptional magnetic strength, neodymjärnborat magnets are widely used in various industries. Common applications include electric motors in electric vehicles and consumer electronics, hard disk drives, magnetic resonance imaging (MRI) machines, wind turbines, and loudspeakers. Their high performance comes with certain limitations, such as a tendency to corrode, which often necessitates protective coatings. They also lose some of their magnetic strength at elevated temperatures.