An introduction to the details of sintered ndfeb ndfeb manufacturer
Sintered ndfeb magnets as a sunrise industry of energy conservation and environmental protection, has been widely used in information technology, automobile, nuclear magnetic resonance (NMR), wind power and motor, and other fields, in the next 3 -
5 years of compound growth rate of around 20%.
Because China has the obvious advantage of resources, cost and market, the world of ndfeb industry is transferring to China, in 2005 China's ndfeb production has accounted for more than 70% of global production.
Sintered ndfeb term definition: the main magnetic: including the remanent magnetism of permanent magnet (
, the intensity of magnetic pole coercive force (
Intrinsic coercive force)
Magnetic induction intensity of coercive force (
, the maximum magnetic energy product (
Auxiliary magnetic: including the relative return permeability of the permanent magnet (
, remanent magnetization (temperature coefficient
And magnetic pole strength coercive force (temperature coefficient
, Curie temperature (
Classification of material classification: according to the magnetic pole strength of sintered ndfeb magnet coercive force size is divided into low coercive force N, moderate coercive force M, H high coercive force, high coercive force SH, high coercive force, UH, high coercive force EH six products brand: each type of product according to the maximum magnetic energy product size divided several brand N35 -
N52 N35M -
N45SH N28UH -
N35EH digital brand: brand sample: 048021 (
Max is 366 ~ 398 kj/m, Hcj to 800 ka/m of sintered ndfeb permanent magnet materials.
Grades by the main characters of the brand: sintered ndfeb magnet ChenHe two magnetic properties of three parts, the first part is given priority to, according to the chemical symbol ND of neodymium, iron chemical symbol of FE and boron element, chemical symbol B, the second part is the line in front of the Numbers, the biggest magnetic energy product material (
The nominal value (Max
The unit is kj/m)
, after the third part is the slash, digital, magnetic pole strength coercive force value (
The unit is KA/m)
One over ten of the value USES the nearest integer.
Brand example: NdFeb380/80 (
Max is 366 ~ 398 kj/m, Hcj to 800 ka/MR sintered ndfeb permanent magnet materials.
Chemical composition of sintered ndfeb magnet is based on intermetallic compounds RE2FE14B permanent magnetic material.
Main ingredients for rare earth (
, iron (
, boron (
The rare earth ND for different performance available parts of dysprosium (
, praseodymium (
Other rare earth metals replace, iron can also be cobalt (
, aluminum (
And other metal parts to replace, the content of boron is small, but to form a square crystal structure between the metal compounds play an important role, yes compounds with high saturation magnetization, high uniaxial anisotropy and high Curie temperature.
Manufacturing process of sintered ndfeb magnet is powder metallurgy process, smelting metal powder and in the field of medium voltage after pressing, pressing in inert gas or vacuum sintering densification, in order to improve the magnet coercive force, usually need to be aging heat treatment.
Material application of sintered ndfeb magnet material have excellent magnetic, widely used in electronics, electricity, machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields, is one of the more common permanent magnet motor, speaker, magnetic separator, computer disk drives, magnetic resonance imaging equipment instrument, etc.