What material is good for magnetism?
Nickel iron alloy. The content of nickel is 30% ~ 90%, which is also called permalloy. The magnetic properties of the alloy can be controlled by alloying element ratio and proper process, and soft magnetic materials such as high permeability, constant permeability and torque are obtained. Because of its high plasticity and sensitive to force, it can be used as a pulse transformer material, an inductance iron core and a functional magnetic material.
Si Al alloy. Silicon is added to the two yuan iron aluminum alloy. Its hardness, saturation magnetic induction intensity, permeability and resistivity are higher. The disadvantage is that magnetic properties are sensitive to composition fluctuations, brittleness and poor processability. Mainly used in audio and video heads.
Fe Al alloy. Containing 6% ~ 16%, with excellent soft magnetic properties, permeability and high resistivity, high hardness, good wear resistance, but brittle, mainly used in the manufacture of small transformer, magnetic amplifier, relay core and magnetic head, ultrasonic transducer etc..
Fe Si alloy. Silicon content of 0.5% ~ 4.8%, usually made of thin plate, commonly known as silicon steel sheet. After adding silicon into pure iron, the magnetic properties of the magnetic material can be eliminated with the use of time. With the increase of silicon content, the thermal conductivity decrease, brittleness increases, the saturation magnetization decreased, but the resistivity and high magnetic permeability, decrease the coercivity and the eddy current loss, which can be applied to the communication field, the core manufacturing motor, transformer, relay, transformer etc..
Pure iron and low carbon steel. The carbon content of less than 0.04%, including magnetic iron, electrolytic iron and iron. Its characteristic is high saturation magnetization, low price, good processing performance; but its low resistivity, under alternating magnetic field eddy current loss, only suitable for static use, such as the manufacture of electromagnetic core and pole, the relay and the loudspeaker magnetic conductor, magnetic shield etc..
