Amorphous magnetic rings are magnetic components processed with amorphous materials. According to the different materials used, the amorphous strips can be divided into iron-based amorphous, cobalt-based amorphous and so on. According to the shape of the material, it can be divided into tape magnetic ring and powder magnetic ring. The saturated magnetic density of amorphous magnetic rings is much higher than that of ordinary ferrite and powder cores. However, with the increase of frequency, the permeability decreases rapidly. It is generally used in the frequency bands of tens to hundreds of K.
Amorphous alloys, or metallic glasses, are a new type of materials that came out in the 1970s. They are formed into thin strips with a thickness of 30 microns by quenching technology. The obtained solid alloys (strips) are different from the regular arrangement of atoms in cold-rolled silicon steel. It is this kind of alloy whose atoms are located in. The irregular arrangement of amorphous alloys makes them have narrow B-H circuit, high magnetic conductivity and low loss. At the same time, the irregular arrangement of amorphous alloys atoms limits the free passage of electrons, resulting in a resistivity 2-3 times higher than that of crystal alloys, which is also conducive to reducing eddy current losses. The no-load loss of transformer core made of amorphous alloy is reduced by about 75% compared with the traditional transformer using silicon steel sheet, which makes the amorphous alloy transformer have remarkable energy saving and environmental protection effect. When the amorphous alloy transformer core is used in oil-immersed transformer, it can obviously reduce a variety of harmful gases. Therefore, more and more manufacturers use amorphous alloys as raw materials for transformer cores.
fe-based amorphous alloys
Typical performance:
Saturation magnetic induction strength Bs 1.56T hardness Hv > 960
Curie temperature Tc 410 degree C density D 7.18g/cm 3
CRYSTALLIZATION TEMPERATURE Tx 550 DEGREE C RESISTIVITY R 130Wm-cm
Saturated magnetostrictive coefficient LS 27'10-6 thermal expansion coefficient Dl/l
Maximum permeability > 2x104 > 20'104 > 25'104
Saturated magnetic induction 1.5 T 1.5 T 1.5 T
Residual magnetic induction < 0.5 T 0.5-1.0 T 1.2 T
Coercive force < 4A/m < 2.4 A/m < 4A/m
Loss (50Hz, 1.4T) < 0.2W/kg < 0.13W/kg < 0.3W/kg
Loss (400Hz, 1.2T) < 1.8W/kg < 1.25W/kg < 2 W/kg
Loss (8kHz, 1.0T) < 80W/kg < 60W/kg < 100W/kg
The change rate of iron loss (-55 C-125) is < 15% < 15% < 15%.
Change rate of iron loss (120 degree C'200 hours) < 15% < 15% < 15% < 15%.
Note: The above data are the best magnetic properties of amorphous strip after heat treatment, but they do not represent the final properties of iron core. When the strip is made into iron core, it is normal that some performance changes occur due to specific conditions.
Saturation inductance (T) 1.56 2.03
Coercive force (A/m) < 4 < 30
Maximum permeability (Gs/Os) 45*104 4*104
Iron loss (W/kg) 50 Hz, 1.3 T < 0.250 Hz, 1.7 T = 1.2
Excitation power (VA/kg) 50 Hz, 1.3 T < 0.550 Hz, 1.7 T < 0.83
Lamination coefficient > 0.800.95
Magnetostriction (>'10-6) 27-
Resistivity (>mW-cm) 130 45
Specific gravity (g/cm3) 7.18 7.65
Crystallization temperature (?) 550-
Curie temperature 415 746
Tensile Strength (Mpa) 1500 343
Vickers hardness (HV) 900 181
Thickness (micron) 30 300
Examples of products
Nanocrystalline alloy
Iron-based nanocrystalline alloys are amorphous materials formed by rapid solidification of alloys consisting mainly of iron and adding a small amount of Nb, Cu, Si and B. After heat treatment, the amorphous materials can obtain microcrystals with a diameter of 10?20 nm, which are dispersed on the amorphous matrix and are called microcrystalline and ultrafine. Crystalline or nanocrystalline materials. Nanocrystalline materials have excellent comprehensive magnetic properties: high saturation magnetic induction (1.2T), high initial permeability (8*104), low Hc (0.32A/M), low high frequency loss under high magnetic induction (P 0.5T/20KHz=30W/kg), high resistivity (80_/cm), higher than permalloy alloy (50-60_/cm). High Br (0.9) or low Br (1000G) can be obtained by longitudinal or transverse magnetic field treatment. S). It is widely used in high-power switching power supply, inverter power supply, magnetic amplifier, high-frequency transformer, high-frequency converter, high-frequency choke coil core, current transformer core, leakage protection switch, common-mode current. Inductive core.
Applications:
It can replace silicon steel, permalloy and ferrite as main transformer, control transformer, filter inductor, energy storage inductor, reactor, magnetic amplifier, saturated reactor core, common mode inductor and differential mode inductor core of EMC filter, ISDN Micro-Isolator of high and medium power (20KHz? 100KHz) switching power supply. The transformer core is also widely used in various types of transformer cores with different accuracy.
Performance characteristics:
High saturation magnetic induction strength, high permeability, low coercivity, low loss and good stability, wear resistance, corrosion resistance, at the same time, with a low price, all soft metal magnetic materials have the best performance-price ratio.
Typical performance:
Saturated magnetic induction intensity Bs
1.25 T
Saturated magnetostrictive coefficient
2 x 10-6
Curie temperature Tc
560 degree C
Density D
7.2 g/cm 3
Crystallization temperature Tx
510 degree C
resistivity
130mW-cm
Hardness Hv
880 kg/mm2
