Introduction to the salient features of AlNiCo magnets

1. The temperature coefficient is small, the remaining reversible temperature coefficient αbr is only about -0.02%/° c, and the reversible temperature coefficient of coercive force is about + 0.015%/° c.

2. It has excellent corrosion resistance, the Curie temperature is 860 ° c, and the suitable temperature is 550 ° c. The magnetic properties of Al-Co vary little with temperature. At present, it is still widely used in permanent magnet devices such as instruments and motors that require high temperature stability, especially in spacecraft and weaponry such as torpedoes, missiles, and aircraft. The residual magnetic flux density of this kind of teaching materials is relatively high, and the maximum temperature can reach 1.35 t, but because of their low intrinsic coercive force, usually less than 160 ka/m, its demagnetization curve analysis is a nonlinear development change, And the return line of AlNiCo permanent magnet does not coincide with the demagnetization curve, so special attention should be paid to its particularity when designing and manufacturing the magnetic circuit system of electronic devices, and the permanent magnet must be stabilized in advance.

3. According to the characteristics of low coercive force of aluminum, nickel and cobalt permanent magnet materials, contact with any ferromagnetic materials is strictly prohibited, so as not to cause local irreversible demagnetization or distortion of magnetic flux density distribution. In addition, in order to improve its ability to resist demagnetization, the pole faces of AlNiCo permanent magnets are usually designed in a columnar or strip shape. In addition, magnetic steel permanent magnet materials have low mechanical strength, high hardness, high brittleness, and poor processability, so they cannot be designed as structural parts, and can only be processed by a small amount of grinding or EDM, and cannot be used for machining such as forging