About the magnet in aluminum nickel cobalt (AlNiCo), I think many friends have never heard of, mainly because this kind of magnet in our daily life involves relatively little, contact less natural understanding of little, today this article focuses on the advantages and disadvantages of AlNiCo magnet, AlNiCo magnet classification, application, the shape can it be processed into and its anti-demagnetization ability.
First, it's an alloy of aluminum, nickel, cobalt, iron and other trace metals. With high energy, high induction, high residual flux density, corrosion resistance and high temperature resistance.
Which kinds of permanent magnet are AlNiCo?
It can be mainly divided into casting AlNiCo magnet and sintered AlNiCo magnet two categories. The shape of casting AlNiCo magnet can be diversified and complicated. Mechanical dimensional tolerances of sintered Al Ni Co can be controlled more precisely.
What are the applications of Al-Ni-Co magnets?
Next, let's talk about their application. Cast AlNiCo magnet products are mainly used in automotive parts, instruments, electroacoustic, electrical, teaching and aerospace military fields. Sintered AlNiCo magnet is widely used in electric motors (now gradually replaced) instrumentation, communications, magneto electric switches and various sensors.
What shapes can AlNiCo magnets be machined into?
The production shapes are cylindrical, circular, rectangular, flat, tile, horseshoe shape.
How to process and produce Al Ni Co permanent magnet material in general?
Al-nickel-cobalt permanent magnet material has low mechanical strength, high hardness, easy brittleness and poor machinability. It can only carry out a small amount of grinding or electric discharge machining during processing, and can not use forging and other mechanical processing.
What are the advantages of Al Ni Co permanent magnet?
It has the advantages of high remanence (up to 1.35T) and low temperature coefficient. When the temperature coefficient is -0.02%℃, the highest temperature can reach about 520℃.
What are the disadvantages?
AlNiCo intrinsic coercivity is very low, usually less than 160 kA/m, its demagnetization curve is nonlinear change, and AlNiCo permanent magnet loop and demagnetization curve does not coincide, so in the design and manufacture of device magnetic circuit to pay special attention to its particularity, must be carried out magnetic stability treatment of permanent magnet in advance. According to the characteristics of low coercivity of AlNiCo permanent magnet material, it is strictly prohibited to contact with any ferromagnetic material in the process of use, so as to avoid local irreversible demagnetization or distortion of flux density distribution. In addition, in order to strengthen its demagnetization ability, AlNiCo permanent magnet pole surface is often designed with long column or rod shape.
