Soft magnetic alloy are in weak magnetic field with high permeability and low coercive force of alloys.This kind of alloy are widely used in radio electronics, precision instruments and meters, remote control and automatic control system, the combination is mainly used for energy conversion and information processing, the two aspects of is an important material in the national economy. Soft magnetic alloy outer magnetic field under the action of easy magnetization, basic disappear after removal of magnetic field of magnetic induction intensity and magnetic alloys. The hysteresis loop area is small and narrow, coercive force generally below 800 a/m, high resistivity, eddy current loss is small, high permeability, high saturation magnetic induction.Are generally processed into sheets and strip.Melt was prepared.Mainly used for electrical appliances, telecommunications industry in various core components (such as transformer core, relay iron core, choke coil, etc.).Commonly used soft magnetic alloy has a low carbon electrical steel, eminem iron, silicon steel sheet, soft magnetic alloy, iron, cobalt soft magnetic alloy, nickel iron iron silicon soft magnetic alloy, etc.
Physical properties of Under the action of outside magnetic field easily after magnetization, except to the magnetic field of magnetic induction intensity (magnetic induction) and basic disappearance of magnetic alloy.Hysteresis loop area is small and narrow, coercive force (Hc) average less than 10 Oe (see precision alloy).In the late 19th century made of low carbon steel motor and transformer core.1900 magnetic higher silicon steel sheet quickly replaced the low-carbon steel, used in the manufacture of electric power industry products.In 1917 the Ni - Fe alloy to adapt to the current needs of the telephone system.Then the Fe - Co alloy with different magnetic properties (1929), Fe - Si - Al alloy (1936) and Fe - Al alloy (1950) to meet the special purpose.In 1953 China began production of hot rolled silicon steel sheet.The late '50 s and began to study Ni - Fe and soft magnetic alloy such as Fe, Co, 60 s gradually began to produce some of the major soft magnetic alloy.In the 70 s production of cold rolled silicon steel belt. The magnetic properties of soft magnetic alloy mainly is: a. coercive force (Hc) and low hysteresis losses (Wh);B. resistivity (rho) is higher, low eddy current loss (We);C. the initial permeability (mu 0) and the maximum high permeability (microns);Some alloy within the scope of the low magnetic field permeability (B/H) maintain a constant;D. high saturation magnetic susceptibility (Bs);E. some alloy hysteresis loop is rectangle, rectangle than the remanence/maximum magnetic induction (Br/Bm) high.The magnetic state of structure and components of the alloy are closely related.Metal impurities such as carbon, sulfur, nitrogen and oxygen for magnetic particularly harmful, because they make the lattice distortion, magnetization, carbon and nitrogen can also cause magnetic aging phenomenon.Soft magnetic alloy general requirements finished product grain size is large, in order to reduce Hc and Wh values.General ferromagnetic metal magnetic vary with different crystallographic axis direction, such as iron < 100 > direction is easy to be magnetized, < 111 > direction of magnetization difficult.So can control grain orientation in a specific direction can get better magnetic materials.Iron of low resistivity (rho), add some alloy elements can improve the rho value, and the effect of silicon and aluminum.Add any alloying elements in iron (except cobalt), low saturation magnetic induction Bs can make it.
The main kinds of Can be divided into low carbon electrical steel and eminem iron, silicon steel sheet, nickel iron soft magnetic alloy, iron, cobalt soft magnetic alloy, iron, silicon aluminum soft magnetic alloy, etc., in terms of electric power industry, mainly used in high magnetic field with high magnetic induction and low core loss of the alloy.In the electronic industry, mainly used in low or medium under magnetic field with high permeability and low coercivity of the alloy.Under high frequency must adopt the thin strip or higher resistivity of the alloy.Commonly used sheet or strip. Commonly used symbols and USES Soft magnetic iron nickel alloy Brand: 1 j46 1 j50 j54 1 j76 j77 1 j79 j80 1 j85 1 j86 j34 1 j51 j52 1 j65 j66 1 j67 j83 1 j403 Execution standard: GBn198-88 USES: most used in weak magnetic or secondary magnetic field work of small transformer, pulse transformer, relays, transformers, magnetic amplifier, electromagnetic clutch, the reactor core and magnetic shielding.
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