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Iron-based nanocrystalline alloy

by:Transmart     2020-05-17
Composition: iron is given priority to, add a small amount of Nb, Cu, Si, B elements made of alloy, the rapid solidification technology to form a - Amorphous materials. A diameter of 10 - after the heat treatment 20 nm microcrystalline, scattered in the amorphous matrix, known as microcrystalline, nanocrystalline materials. Performance: has excellent comprehensive magnetic, high saturation magnetic induction, high initial magnetic permeability, low Hc, high magnetic induction low loss at high frequency, resistivity than mo alloy high slope. The longitudinal or transverse magnetic field treatment, Br in either high or low Br value can be obtained. Is the best comprehensive properties of materials on the market at present. Application: widely used in high-power switching power supply, inverter power supply, magnetic amplifier, high-frequency transformer, high frequency transformer, high frequency reactor core, current transformer core, leakage protection switch, common-mode inductor core. In recent years, the emergence of iron-based nanocrystalline alloy added a good common-mode inductor core material. Iron-based nanocrystalline alloy manufacturing process is: first made thickness about 20 - rapid solidification technology 30 microns thin amorphous alloy belt, winding into the iron core after further processing after forming nanocrystals. Compared with ferrite nanocrystalline alloy has some unique advantages: high saturation magnetic induction intensity: iron-based nanocrystalline alloy 1 Bs. 2 t, ferrite is more than twice. As a common-mode inductor core, an important principle is the core cannot be magnetized to saturation, otherwise the inductance sharply lower. In practical application, there are a number of occasions the interference intensity is bigger, High power frequency conversion motor, for example) , if by ordinary as common-mode inductor, ferrite core is saturated, can't guarantee big strength under the interference of noise suppression effect. Due to the high saturation magnetic induction intensity of nanocrystalline alloy, its resistance to saturation characteristic is obviously better than the ferrite, makes nanocrystalline alloy, very suitable for the occasion of sustain strong interference current. High initial permeability: the initial permeability of the nanocrystalline alloy can reach 100000, far higher than that of ferrite, thus made the common-mode inductance of nanocrystalline alloy under the low magnetic field with large impedance and insertion loss and has good inhibition to the weak interference. For this tiny leakage current of common mode filter is especially weak interference. In certain situations, Such as medical equipment) And device based on capacitance ( If the body) Caused by leakage current, easy to form the common mode interference, and the device itself is very strict. The use of high permeability nanocrystalline alloy common-mode inductor may be the best choice. In addition, the high permeability of nanocrystalline alloy coil number of turns can be reduced, to reduce the parasitic capacitance distribution parameters, such as, will thus caused by distributed parameter on the insertion loss spectrum of formant frequency increase. At the same time, high permeability of nanocrystalline core making common-mode inductor has higher inductance and resistance value, or the equivalent inductance under the premise of reduce the volume of core. Excellent temperature stability: iron-based nanocrystalline alloy above the Curie temperature is as high as 570 oc. In the case of with large temperature fluctuations, the properties of nanocrystalline alloy significantly lower rate of ferrite, with excellent stability, and the change of performance is close to linear. Generally, in - nanocrystalline alloy 50oC- - - - - - - - - - - - - - - - - - - Within the temperature range of 130 oc, main magnetic rate within 10%. Curie temperature of ferrite, by contrast, generally under 250 oc, magnetic can sometimes change rate above 100%, and is nonlinear, is not easy to compensation. The temperature stability of the nanocrystalline alloy in combination with the characteristic of the low loss characteristics, the designers to the device provides a loose condition. And figure 3 the temperature of saturated magnetic induction intensity for different material properties. Frequency characteristics of the flexible: through different manufacturing processes, nanocrystalline core can obtain different frequency characteristics, with the appropriate coil number of turns can get different impedance characteristics, can satisfy the demands of different wave band filter, and the impedance values compared with ferrite. It should be noted that any filter cannot be expected to use a core material can achieve the whole frequency range of noise suppression, but should be according to the requirements of the filter filter band to choose different iron core material, size and number of turns. Compared with ferrite nanocrystalline alloy can be more flexibly by adjusting the process to get the required frequency characteristic. Iron-based nanocrystalline alloy since the late 1980 s, the development has been in switching power supply transformer, transformer, and other fields has been widely applied. Because of the nanocrystalline alloy of high permeability, high saturation magnetic induction, the advantages of the flexible adjustable frequency characteristic, in the areas of common mode interference filter is becoming more and more attention. Foreign existing could supply large quantities of iron-based nanocrystalline alloy common-mode inductor core. With the gradually deepening understanding of nanocrystalline alloy, they are making common-mode inductor can be estimated in the domestic application prospects will be more and more broad.
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