All sorts of commonly used permanent magnet materials explain _ ndfeb strong magnet manufacturers
Commonly used permanent magnet materials: & ensp;
With wide hysteresis loop, high coercive force, high remanence, once magnetization can keep constant magnetic materials.
Also known as hard magnetic materials.
Practical, permanent magnet magnetization after working in the depth of magnetic saturation and the second quadrant demagnetization part of the hysteresis loop.
The commonly used permanent magnet materials are divided into aluminum nickel and cobalt permanent magnet alloy, iron chromium cobalt permanent magnetic alloys, permanent magnet ferrite, rare earth permanent magnet materials and composite permanent magnetic materials.
1) aluminum nickel and cobalt permanent magnetic alloys.
Iron, nickel, aluminum as the main component, also contains the elements such as copper, cobalt, titanium.
High remanence and low temperature coefficient, magnetic stability.
Cent two kinds of alloy casting and powder sintering alloy.
30 ~ 60 s application is more, now more coil system used in the instrumentation industry in instrument, meter, micro motors, relays, etc.
(2) iron chromium cobalt permanent magnetic alloys.
With iron, chromium, cobalt element as the main ingredient, also containing molybdenum and a small amount of titanium, silicon.
The processing performance is good, can be cold thermoplastic deformation, magnetic similar to aluminum nickel and cobalt permanent magnet alloy, and can through plastic deformation and heat treatment can improve the magnetic.
Used in the manufacture of all kinds of small cross section, complex shape of small magnet components.
(3) permanent magnetic ferrite.
Mainly include barium ferrite, strontium ferrite, and its high resistivity, coercive force is big, can be effectively applied in the air gap magnetic circuit, especially suitable for small generator and permanent magnet motor.
Permanent magnetic ferrite do not contain precious metals such as nickel, cobalt, rich source of raw materials, simple process, low cost, can replace aluminum nickel and cobalt permanent magnet system of magnetic separator, magnetic bearing, speakers, microwave devices, etc.
But the maximum magnetic energy product is low, temperature stability, quality of a material is brittle, fragile, don't impact resistance vibration, unfavorable for measuring instrument and precision requirements of the magnetic device.
(4) rare earth permanent magnet materials.
Cobalt mainly rare earth permanent magnet materials and ndfeb permanent magnet materials.
The former is a rare earth element cerium, praseodymium, lanthanum, neodymium and cobalt formation of intermetallic compounds, such as the magnetic energy product can be up to 150 times that of carbon steel, aluminum nickel and cobalt permanent magnet 3 ~ 5 times & ensp;
8 ~ 10 times, permanent magnet ferrite, low temperature coefficient, stable magnetic, coercive force of up to 800000 / m.
It is mainly used for low speed torque motor, start the motor, sensors, magnetic system of magnetic bearing, etc.
Ndfeb permanent magnet material is the third generation of rare earth permanent magnet materials, the remanent magnetism, high coercive force and the maximum magnetic energy product than the former, non-friable, has good mechanical properties, alloy density is low, is advantageous to the magnetic components of light-duty, thin, small and microminiaturization.
But the magnetic temperature coefficient is higher, limits its application.
(5) composite permanent magnetic materials by permanent magnetic material and powder compounded plastic material as a binder.
Due to its certain percentage of binder content, so the magnetic than corresponding no binder magnetic materials significantly reduced.
In addition to the metal composite permanent magnetic materials, other composite permanent magnetic materials due to the binder and the limit of the heat resistance, temperature is low, generally does not exceed 150 ℃ & ensp;
But composite permanent magnetic materials high dimensional accuracy, good mechanical performance, magnet performance uniformity is good, the parts easy to radial orientation and multi-polar magnet magnetization.
Mainly used in the manufacture of instruments and meters, communication equipment, rotating machinery, such as magnetic therapy equipment and sporting goods.