1. NdFeB Production Process
NdFeB magnets can be divided into two types: bonded NdFeB and sintered NdFeB. Bonding is actually injection molding, while sintering is vacuumed and heated at high temperatures. The core technology of the NdFeB magnet industry is mainly reflected in the manufacturing process, which is embodied in the uniformity, consistency, processing quality, and coating quality of its products. NdFeB magnets have many different preparation processes with different metal elements added, such as powder metallurgy, melt quenching, Pr(Nd)-Fe-Cu-B hot pressing/hot rolling, reduction diffusion method
a. Mixing ingredients:
Raw materials such as NdFeB are put into the crucible.
b. Melting:
The raw material is melted in a vacuum furnace to form a uniform alloy (ingot).
c. Pulverize:
In the case of passing nitrogen, the alloy is pulverized to a fine powder of several microns by equipment such as a "jet pulverizer".
d. Forming in a magnetic field:
Put the micro powder into a mold with a magnetic field for stamping, so that the magnetization direction of the microparticle crystal becomes consistent.
e. Sintering:
There are many voids between the formed particles, so heating at a temperature lower than the melting point makes it a dense block, that is, a "sintered body". After this process, the volume will be reduced to half of the original.
f. Make it magnetic:
An external magnetic field is applied to the non-magnetic magnet material. After this process, the magnet material can become a permanent magnet
2. Where is NdFeB Used?
Nowadays, it is no exaggeration to say that our lives are supported by NdFeB magnets. From speakers to air conditioners, from refrigerators to electric cars, there must be magnets on the motors that convert electric current into power. It can be said that magnets give us modern Comfortable life.
Its main application areas are as follows:
a. Electroacoustic field: speakers, receivers, microphones, alarms, stage audio, car audio, etc.
b. Electronic appliances: permanent magnet mechanism vacuum circuit breakers, magnetic latching relays, watt-hour meters, water meters, sound counters, reed switches, sensors, etc.
c. Motor field: VCM, CDDVD-ROM, generator, motor, servo motor, micro motor, motor, vibration motor, etc.
d. Mechanical equipment: magnetic separation, magnetic separator, magnetic crane, magnetic machinery, etc.
e. Medical care: nuclear magnetic resonance apparatus, medical equipment, magnetic therapy health care products, magnetized fuel saver, etc.
f. Other industries: magnetized wax inhibitor, pipe descaler, magnetic fixture, automatic mahjong machine, magnetic locks, door and window magnets, stationery magnets, luggage magnets, leather magnets, toy magnets, tool magnets, craft gift packaging, etc.