In addition to conventional magnets, there are also magnets of special composition used in some special occasions and equipment, such as FeCoW alloy, CoFeNi alloy, SmFeN magnet and so on.
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SmFeN magnet is an anisotropic magnet that is mixed and granulated by SmFeN magnetic powder and engineering plastic PA12, then injected and molded in an oriented magnetic field. SmFeN material does not contain metallic Co and other heavy rare earth elements, and its cost performance is better than NdFeB magnets. Its oxidation resistance and corrosion resistance are better than NdFeB, which is 2 to 3 times that of similar NdFeB materials. Products are mainly used in sensors, motors, etc.
CoFeNi alloy is an anisotropic semi-hard magnetic material with very high residual magnetic induction and stable coercivity. The machining performance is good, and it can be drawn into various specifications of wire, and good organization anisotropy is obtained during the drawing process. Products are mainly used in iron reed relays, magnetic valves, hysteresis motors and other fields.
FeCoW alloy is an isotropic permanent magnet material with special magnetic properties and good machining performance. The hardness of the material is very high. The products are mainly used in the field of hysteresis series products.
The injected samarium cobalt magnet is an anisotropic magnet that is mixed and granulated by SmCo magnetic powder and engineering plastic PA12, and then injected and molded in an oriented magnetic field. The injected samarium cobalt magnet has better magnetic properties and temperature stability, and the temperature resistance and irreversible loss of magnetic flux are better than the injected neodymium iron boron magnet. Products are mainly used in motors, sensors, etc.