Views:45 Author:Site Editor Publish Time: 2020-08-19 Origin:Site
Neodymium magnets are neodymium iron boron magnets, and their chemical formula is NdFeB, which is an artificial permanent magnet. This kind of magnet is a permanent magnet with magnetism second only to absolute zero degree holmium magnet, and it is also the most commonly used rare earth magnet. neodymium permanent magnet are widely used in electronic products. So far, this is the strongest magnetic material, so it is called the king of magnets.
Its BHmax value is 5-12 times that of ferrite magnets and 3-10 times that of alnico magnets; its coercivity The force is equivalent to 5-10 times that of ferrite magnets, and 5-15 times that of Alnico magnets. Its potential magnetic properties are extremely high, and it can absorb heavy objects about 640 times its own weight. Incredible Grade N42 Magnetic Energy, stronger than N40, N38, N35, and a whopping 10x Stronger than the strongest ceramic magnet. The highest grade of neodymium magnet currently available is neodymium magnets n52. Any letter following the grade refers to the temperature rating of the magnet. If there are no letters following the grade, then the magnet is standard temperature neodymium.
Since the main raw material iron of neodymium iron boron magnets is very cheap, the reserve of rare earth neodymium is 10-16 times more than that of samarium, so its price is much lower than that of samarium cobalt magnets.
The mechanical properties of neodymium iron boron magnets are better than samarium cobalt magnets and alnico magnets, and it is easier to cut, drill and process complex shapes.
The disadvantage of neodymium iron boron magnets is its poor temperature performance, large magnetic loss when used at high temperatures, and low maximum operating temperature. Generally, it is about 80 degrees Celsius, and the maximum working temperature of magnets with special treatment can reach 200 degrees Celsius.
Because the material contains a lot of neodymium and iron, it is easy to rust and it is also a major weakness. So neodymium iron boron magnets must be surface coated. It can be electroplated with nickel (Ni), zinc (Zn), gold (Au), chromium (Cr), epoxy resin (Epoxy), etc.
NdFeB magnets are currently widely used in aerospace, electronics, electromechanical, instrumentation, medical and other fields. And the use of non-technical fields is becoming more and more extensive, such as adsorption magnets, toys, jewelry and so on.