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Other magnets

There are also aluminum nickel cobalt sintered magnets and iron chromium cobalt sintered magnets on the market.

Al Ni Co sintered magnetite

(1) Metal magnet with a long history, with relatively high Br

*Aluminum magnet is a kind of metal magnet, which is mainly made of aluminum, nickel, cobalt and iron, and is made of casting or sintering.

*Br is high, and most materials exceed 10000 (G).

(2) Resistance to temperature changes

*The temperature coefficient of Br is the smallest, -0.02%/° C, which is a magnet with small reversible temperature change.

*The temperature coefficient of Hcj is almost zero, close to 600 ° C. It is a magnet that can be used for high temperature.

(3) Easily demagnetized due to external magnetic field or mechanical shock

*Due to the small value of Hcj, it is easy to demagnetize under the external reverse magnetic field (reverse magnetic field), so care should be taken.

• Hcj is easy to reduce due to mechanical shock, so be careful of mechanical vibration and shock.

(4) Limited shape

*Since the value of Hcj is small, the height size of the magnetization direction must be increased.

*Depending on the shape, molds and dies have limitations, but dimensional accuracy is achieved by polishing to a higher level.