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Application market of amorphous / nanocrystalline soft magnetic materials

Application market of amorphous / nanocrystalline soft magnetic materials

2021-09-01

Amorphous soft magnetic alloy material is a new type of material published in the 1970s. It has attracted great attention because of its advantages such as low core loss, high resistivity, good frequency characteristics, high magnetic induction strength and strong corrosion resistance. It is known as a new green energy-saving material in the 21st century. Its technical features are as follows: the super rapid cooling solidification technology is adopted to form the alloy steel liquid to the thin strip material at one time; Using nanotechnology, nano state (10-20nm) soft magnetic materials between macro and micro are made. The excellent soft magnetic properties of amorphous and nanocrystalline alloys come from their special microstructure. Amorphous alloys have no grains and grain boundaries and are easy to magnetize; The grain size of nanocrystalline alloy is smaller than the length of magnetic exchange, resulting in small average magnetocrystalline anisotropy, and its magnetostriction can be close to zero by adjusting the composition.

Fe-Based amorphous ribbons soft magnetic core materials

In recent years, with the rapid development of information processing and power electronics technology, all kinds of electrical equipment tend to be high-frequency, miniaturized and energy-saving. Amorphous and nanocrystalline alloys have been widely used in the field of electric power. The biggest application of Fe based amorphous alloy is the core of distribution transformer. Since the power frequency iron loss of amorphous alloy is only 1 / 5 ~ 1 / 3 of that of silicon steel, the no-load loss of distribution transformer can be reduced by 60% ~ 70% by using amorphous alloy instead of silicon steel. Therefore, amorphous distribution transformer has a good application prospect as a replacement product. The use of nanocrystalline iron core can not only meet the accuracy requirements, but also the price is lower than that of BoMo alloy. In the field of power electronics, with the maturity of high-frequency inverter technology, the traditional high-power linear power supply began to be replaced by high-frequency switching power supply. In order to improve efficiency and reduce volume, the working frequency of switching power supply is higher and higher, which puts forward higher requirements for soft magnetic materials. The high frequency loss of silicon steel is too large to meet the application requirements. Although ferrite has low high-frequency loss, there are still many problems under high-power conditions. First, the saturated magnetic induction is low, which can not reduce the volume of the transformer; Second, the Curie temperature is low and the thermal stability is poor; Third, the production of large-size iron core has low yield and high cost. At present, nanocrystalline alloy has been widely used in inverter welding power supply, and its application in switching power supply for communication, electric vehicles, electrolytic electroplating and other fields is being actively developed. In the field of electronic information, with the rapid development of computer, network and communication technology, the demand for switching power supply and network interface equipment with small size, light weight, high reliability and low noise is increasing and demanding.

In the electronic anti-theft system, the harmonic anti-theft label using cobalt based amorphous narrow band has been widely used in the library. Recently, the acoustic magnetic anti-theft label using Fe Ni based amorphous strip overcomes the shortcomings of harmonic anti-theft label, such as high false alarm rate and narrow detection area. The application market has been extended to supermarkets. It can be predicted that with the development of open service mode, the application of amorphous alloy strip and wire rod as anti-theft and anti-counterfeiting will increase sharply.

Amorphous Gap Core for Choke Coils

In household products, frequency conversion technology is conducive to saving electric energy and reducing volume and weight. However, the negative effects can not be ignored. If the frequency converter is lack of necessary interference suppression links, a large number of high-order harmonics will be injected into the power grid, reducing the total power factor of the power grid. One of the most effective ways to reduce power grid pollution is to add power factor correction (PFC) link to the frequency converter, in which the key component is the inductive core with low high frequency loss and large saturation magnetic induction. Fe based amorphous alloys have obvious advantages in such applications and will play an important role in the greening of frequency conversion household appliances. At present, the use of amorphous PFC inductors in variable frequency air conditioning has become a focus.

nanocrystalline core

In the leakage protector, the iron core of the zero sequence current transformer in the leakage protector widely used in recent years is made of soft magnetic material, which has a great impact on the sensitivity, reliability, volume and cost of the leakage protector. The transformer made of soft magnetic material is used as the detection component. Its function is to generate enough induced potential in the secondary of the transformer when the primary of the transformer has the weak magnetic field generated by milliampere leakage current or electric shock current, and achieve the purpose of protecting human body and equipment safety through the action of the actuator. The allowable leakage current is related to the sensitivity of leakage protector, in which the iron core plays an important role.


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