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Introduction of Neodymium magnets (NdFeB)

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introduction, classification, history, application, physical property of neodymium magnets

Brief introduction of Neodymium magnets (NdFeb) 

Ndfeb magnetic material, as the latest result of the development of rare earth permanent magnet materials, because of their excellent magnetic, known as "magnetic king". Its BHmax value 5-12 times of the ferrite magnets, 3-10 times of alnico magnets; Its coercive force equivalent to five to ten times of the same the size of ferrite magnets, 5-15 times of alnico magnets, its high magnetic potential, can suck up the equivalent of a weight of 640 times its own weight. 

Ndfeb magnetic material is an alloy of neodymium and iron oxide, etc, also called magnetic steel. As the main raw material of iron ndfeb magnet is very cheap, the reserves of rare earth neodymium is 10 to 16 times more than samarium, so the price also relatively much lower than samarium cobalt magnet.

Ndfeb has a very high magnetic energy and coercive force, high energy density at the same time.To make the advantages of ndfeb permanent magnet material in modern industry and the wide application of electronic technology can help the instruments and meters, electronic motor, magnetization equipments,the magnetic separation equipment minimized, lightweighted, thin. The advantage of ndfeb is cost-effective, good mechanical properties; Deficiency in NdFeB is low point Curie temperature, poor temperature characteristic poor, at high temperatures using magnetic loss is bigger, the highest working temperature is low. General is 80 degrees Celsius, after special processing of the magnet, the highest working temperature can reach 200 degrees Celsius.And Ndfeb material contains a lot of neodymium and iron, easy to rust.  it is easy to be pulverization corrosion, must adjust its chemical composition and take surface coating treatment methods to improve, to reach the requirements of practical application.Surface chemical passivation is currently one of the very good solution.   Click there to buy neodymium magnets Click there to buy neo magnets

 

History of Neodymium magnets

Ndfeb magnet is made of neodymium, iron, boron (Nd2Fe14B) with structure like a tetragonal crystal form. In 1982, Masato Sagawa from Sumitomo Special Metals found that neodymium magnets. The magnet magnetic energy  (BHmax) is greater than the samarium cobalt magnet, at that time viewd as the largest magnetic energy product all over the world. Later, Sumitomo Special Metals won success of powder metallurgy method (powder metallurgy process), General Motors also developed  successful rotary spray melting method (melt - spinning process), leading to wide manufacturing and  application of ndfeb magnets.  this is today's strongest permanent magnet magnetic magnet, which is the most commonly used rare earth magnets , is widely used in electronic products, such as hard drives, mobile phones, headsets, and with a battery-powered tools and so on.     Click there to buy neodymium magnets

 

Classification of Neodymium magnets

Ndfeb magnet can be divided into bonded ndfeb and sintered ndfeb. Bonded NdFeB is, in fact, injection molding, and sintering is by vacuum heating forming! Ndfeb magnet has the strongest so far for magnetic force of permanent magnet. Generally, Grade of NdFeB Material marks N35 - N52; Various shapes according to the specific requirements processing: round, square, hole-punching, magnetic tile, magnetic bar, convex type, trapezoid; Despite these advantages, but the surface is easy to rust, so usually need to do some protective surface treatment: nickel plating, zinc, gold plated, coated with epoxy resin, etc. Ndfeb magnet applicable environmental temperature is 200 degrees or so, is mainly used in electronics, electrical appliances, packaging, electrical, toys, leather, auto machinery, etc.     Click there to buy neodymium magnets

 

Application of Neodymium magnets

Ndfeb magnet application scope is as follows:
Acoustic field: the speaker, receiver, microphone, alarm, stage audio, car audio, etc.
Electronic appliances: vacuum circuit breaker and permanent magnetic actuator magnetic hold relay, electricity meter, water meter, meter sound device, dry reed pipe, sensors, etc.
Motor areas: VCM, CDDVD cd-rom, generators, electric motor, servo motor, micro motor, motor, vibration motor, etc.
Machinery and equipment, magnetic separation, magnetic separator, magnetic crane, magnetic machinery, etc.
Health care: nuclear magnetic resonance instrument, medical equipment, magnetic therapy health care products, magnetizing economizer, etc.
Other industries: magnetization paraffin, pipeline cleaner, magnetic clamping, automatic mahjong machine, magnetic locks, door magnetic, magnetic stationery, magnetic, magnetic, magnetic toys, tools, leather bags,etc.    
  Click there to buy neodymium magnets

 

Typical physical Properties

Parameter  Unit  Standard Data
Curie Temperature(Tc) 
°C
310-380
Maximum Operating Temperature(Tw)
°C
80-220
Hardness
Hv
620
Electrical Resistivity(r) 
W cm
1.8x10-2.0x10
Density(D) 
g/cm
7.50-7.65
Recoil Permeability(m rec)   
1.05
Magnetization Field Strength(Hs) 
Koe
≥30
KA/m
≥2400
 Bending Strength
Mpa
295-345
Temp.Coefficient of Br(aBr
%/°C
-0.11~-0.12
 Temp.Coefficient of Hcj(aHcj)
%/°C
-0.5~-0.
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