Sintered NdFeB Magnets in Solar Energy Industry

As a solar energy industry that is energy-saving and environmentally friendly, sintered NdFeB magnets have been widely used in information technology, automotive, nuclear magnetic resonance, wind power and electric motors. It is expected that the compound growth rate will be around 20% in the next 3-5 years. Due to China’s obvious resources, cost and market advantages, the world’s NdFeB industry is shifting to China. In 2005, China’s NdFeB production has accounted for more than 70% of global production.

Sintered NdFeB Magnets in Solar Energy Industry

Sintered NdFeB Magnets in Solar Energy Industry

Sintered NdFeB term definition:

Main magnetic properties:

Residual magnetism (Br) including permanent magnet material, magnetic polarization coercivity (inner coercivity) (Hcj) magnetic induction coercivity (Hcb), maximum magnetic energy product ((BH)max)

Auxiliary magnetic properties:

Including permanent magnet material relative recovery permeability (μrec), remanence temperature coefficient (α (Br)), magnetic polarization coercivity temperature coefficient (α (Hcj)), Curie temperature (Tc)

Classification grade

Material classification:

Sintered NdFeB magnets are classified into low coercivity N, medium coercive force M, high coercive force H, ultra high coercive force SH, ultra high coercivity UH, extremely high correction according to the coercive force of magnetic polarization. Tenacious EH six products

Brand:

Each product is divided into several grades according to the maximum magnetic energy product size.

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

Number brand:

Example of grade: 048021 denotes sintered NdFeB permanent magnet material with (BH)max of 366~398kj/m and Hcj of 800KA/m.

Character grade:

The grade of sintered NdFeB magnet consists of three main magnetic characteristics: the first part is the main name, which consists of the chemical symbol ND of the element, the chemical symbol FE of the iron element and the chemical symbol B of the boron element. The second part The number before the line is the nominal value of the maximum magnetic energy product (BH)max of the material (in kj/m), the third part is the number after the oblique line, and the coercive force value of the magnetic polarization (unit is KA/m) One tenth of the value is rounded off.

Example of grade: NdFeb380/80 indicates a sintered NdFeB permanent magnet material with a (BH)max of 366~398kj/m and a Hcj of 800KA/MR.

chemical composition

The sintered NdFeB magnet is a permanent magnet material based on the intermetallic compound RE2FE14B. The main components are rare earth (RE), iron (FE), and boron (B). Among them, rare earth ND can be replaced by other rare earth metals such as Dy and Pr, in order to obtain different properties. Iron can also be replaced by other metal parts such as cobalt (Co) and aluminum (Al), and the content of boron is small, but However, it plays an important role in forming a tetragonal crystal structure intermetallic compound, which is a compound having high saturation magnetization, high uniaxial anisotropy and high Curie temperature.

Manufacturing process

The sintered NdFeB magnet is a powder metallurgy process. The smelted alloy is made into a powder and pressed into a preform in a magnetic field. The compact is sintered in an inert gas or vacuum to achieve densification. In order to increase the coercive force of the magnet, usually An aging heat treatment is required.

Material application

Sintered NdFeB magnet materials have excellent magnetic properties and are widely used in electronics, electric machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. Commonly used permanent magnet motors, speakers, magnetic separators, computers Disk drive, magnetic resonance imaging equipment, etc.

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