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Sintered NdFeB

Including the permanent magnet remanence (BR), magnetic polarization coercive force (intrinsic coercive force (Hcj) magnetic induction intensity coercivity (HCB), the maximum energy product (BH) max)

Auxiliary magnetic property

Including permanent magnetic material relative reversion permeability (mu REC), temperature coefficient of remanence (alpha (BR), the magnetic polarization intensity correction of coercive force temperature coefficient (alpha (Hcj) and Curie temperature (TC)

Materials classification and grades

Material classification

Sintered neodymium iron boron permanent magnetic material according to the magnetic polarization strength coercivity size is divided into low coercive force N, middle coercivity M, high coercivity H, especially high coercive force SH, super high coercivity UH, high coercive force EH six kinds of products

Grade

Y type products according to the maximum energy product size is divided into several grades

N52 - N35M, N50M - N30H, N48H - N30SH, N45SH - N28UH, N35UH - N28EH, N35EH - N35

Digital brand

Grade example: 048021 (BH) max for 366~398kj/m, Hcj for the 800KA/m sintered neodymium iron boron permanent magnetic material.

Character grade

Sintered neodymium iron boron permanent magnetic material grades main Chenhe two kinds of magnetic properties is composed of three parts. The first part mainly said by a nd the chemical symbol for Nd, iron chemical symbol Fe and boron element chemical symbol B, the second part line in front of the number is material the maximum magnetic energy product (BH) max nominal value (single lambda kj/m). The third part numbers after slash and magnetic polarization coercivity value (KA/m single lambda is a numerically by rounding rounding.

Grade example: NdFeb380/80 (BH) max for the 366~398kj/m, Hcj for the 800KA/MR sintered neodymium iron boron permanent magnet material.

Chemical composition of sintered neodymium iron boron permanent magnetic material

Neodymium iron boron permanent magnet material is permanent magnetic material based on RE2FE14B. The main components are rare earth (RE), iron (FE), boron (B). The rare earth Nd in order to obtain the performance of different parts of the available dysprosium (Dy), praseodymium (PR) and other rare earth metals alternative, iron can also be replaced by other metal parts of cobalt (CO) and aluminium (AL), the boron content is small, but the formation of tetragonal crystal structure of intermetallic compound plays an important role is the compound has high saturation magnetization and high uniaxial anisotropy and high Curie temperature.

Process for producing sintered neodymium iron boron permanent magnetic material

Sintered neodymium iron boron permanent magnetic material using the powder metallurgy process, smelting alloy powder and magnetic field is pressed into a pressing embryo, embryo compression in an inert gas or vacuum sintering to densification, in order to enhance the coercivity of magnets, usually need to aging heat treatment.

Application of sintered neodymium iron boron permanent magnetic material

Sintered NdFeB permanent magnetic material with excellent magnetic properties, widely used in electronics, electrical machinery, medical equipment, toys, packaging, metal machinery, aviation and aerospace field, the more common with permanent magnet motor, a speaker, a magnetic separator, computer disk drives, magnetic resonance imaging instrumentation equipment and other.


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