Aluminum nickel and cobalt permanent magnet materials

Aluminum nickel and cobalt permanent magnetic material is a kind of aluminum, nickel and cobalt alloys, high temperature resistance, corrosion resistance, magnetic tile it is a big advantage. Aluminum nickel and cobalt is mainly used in motors, sensors, medical instruments, hand tools, loudspeakers and all kinds of instrument.

Aluminum nickel and cobalt (AlNiCo) is the earliest developed a kind of permanent magnetic material, is made from aluminum, nickel, cobalt, iron and other trace metal elements of an alloy. Aluminum nickel and cobalt permanent magnet material is developed in the 1930 s. At that time, its magnetic can best, small temperature coefficient, and therefore most frequently, the most widely used in the permanent magnet motor. Since the 60 s, the ferrite permanent magnet and the field of rare earth permanent magnet, aluminum nickel drill permanent magnet application in the motor be replaced gradually, aluminum nickel and cobalt by proportion is on the decline.

According to different production process can be divided into Sintered AlNiCo, Sintered AlNiCo) and casting aluminum nickel and cobalt (Cast AlNiCo). The product shape are round and square. Casting process can be processed into different size and shape; Compared with casting process, the sintering products is limited to small size, its production of blank size tolerance is better than blank casting products, magnetic is slightly less than the casting products, but it is better machinability. In the permanent magnetic material, casting aluminum nickel and cobalt permanent magnet has the lowest temperature coefficient is reversible, working temperature can be as high as 600 degrees Celsius above. Alnico permanent magnet products are widely used in all kinds of instruments and meters and other application fields.

Aluminum nickel and cobalt is a magnet has the advantage of high remanence (up to 1.35 T), low temperature coefficient. Temperature coefficient is 0.02% / ℃, and the highest temperature can reach 520 ℃ or so. Defect is coercive force is very low (usually less than 160 ka/m), nonlinear demagnetization curve. So although alnico magnets are easy to be magnetized, also easy to demagnetization.