Sintered Neodymium Iron Boron Permanent Magnet

Chongqing Great Wall Technology Co., Ltd. is one of the leading manufacturers and suppliers of sintered neodymium iron boron permanent magnet in China, also supports customized service. Welcome to wholesale high quality sintered neodymium iron boron permanent magnet for sale here from our factory.

The most popular kind of rare-earth magnet is a neodymium magnet, also known as NdFeB, NIB, or Neo magnet. Neodymium, iron, and boron are combined to form the Nd2Fe14B tetragonal crystalline structure. Neodymium magnets are the strongest permanent magnet currently on the market. They were separately created in 1982 by General Motors and Sumitomo Special Metals. In many applications in contemporary products that call for powerful permanent magnets, such as motors in cordless tools, hard disk drives, and magnetic fasteners, they have taken the place of other types of magnets.

Neodymium is a ferromagnetic metal (more specifically, it exhibits antiferromagnetic properties), which means that like iron, it can be magnetized to become a magnet. However, because of its extremely low Curie temperature—the temperature above which its ferromagnetism disappears—of 19 K (or 254 °C—it is only magnetic in its pure form).However, neodymium magnets are made from compounds with transition metals like iron that have Curie temperatures much above ambient temperature.

The strength of neodymium magnets is due to several factors. The most significant is the extremely high uniaxial magnetocrystalline anisotropy of the tetragonal Nd2Fe14B crystal structure (HA 7 T - magnetic field strength H in units of A/m versus magnetic moment in Am2). This indicates that a crystal of the substance preferentially magnetizes along a certain crystal axis, whereas magnetization in other directions is exceedingly challenging. The neodymium magnet alloy, like other magnets, is made of microcrystalline grains that are during manufacturing aligned in a strong magnetic field such that their magnetic axes all point in the same direction. The compound has a very high coercivity, or resistance to demagnetization, due to the crystal lattice's resistance to changing its direction of magnetism.

Due to the fact that the neodymium atom has 4 unpaired electrons in its electron structure as compared to (on average) 3 in iron, the neodymium atom can potentially have a significant magnetic dipole moment. The magnetic field of a magnet is produced by unpaired electrons that are aligned so that they spin in the same direction. This results in a strong saturation magnetization (Js 1.6 T or 16 kG) and typically 1.3 teslas for the Nd2Fe14B combination. As a result, this magnetic phase has the capacity to store significant amounts of magnetic energy (BHmax 512 kJ/m3 or 64 MGOe), as the highest energy density is proportional to Js2. By volume, this magnetic energy value is roughly 18 times larger than that of "ordinary" magnets. Samarium cobalt (SmCo) magnets, which were the first kind of rare-earth magnet to be marketed, had a lower level of this characteristic than NdFeB alloys. Neodymium magnets' magnetic characteristics are actually influenced by the alloy's microstructure, manufacturing process, and composition.

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