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Introduce the "secret" of amorphous strip

Introduce the "secret" of amorphous strip

2021-09-29

What is amorphous strip? There are generally two kinds of materials that people touch in daily life: one is crystalline material and the other is amorphous material. The so-called crystalline material means that the placement of atoms inside the material follows a certain law. On the contrary, if the internal atoms are placed in an irregular state, it is an amorphous material. In general metals, the internal atoms are arranged in an orderly state and are all classified as crystalline materials.


Scientists have discovered that after the metal is melted, the internal atoms are in a lively state. Once the metal begins to cool, the atoms will follow the drop in temperature, and slowly place them up in an orderly manner according to certain crystalline laws to form crystals. If the cooling process is fast, the atoms will be condensed before they can be placed again, resulting in an amorphous alloy. The preparation of the amorphous alloy is precisely a rapid condensation process. The high-temperature molten steel in the molten state is sprayed onto the high-speed rotating cooling roll. The molten steel is rapidly cooled at a rate of one million degrees per second, and the molten steel at 1300°C is reduced to below 200°C in only one thousandth of a second to form an amorphous strip.


The primary characteristics of amorphous crystals


1. Amorphous crystals are composed of ferromagnetic elements (Fe, Ni, Co) and amorphous elements (Si, B, C);


2. The characteristics of amorphous composite crystal: low coercivity, high permeability, low loss, low saturation magnetic induction, high resistivity, high temperature stability, excellent frequency characteristics and adjustable magnetic function;


3. After proper annealing, the iron-based non-wafer (strip) shows a lower specific total loss than the oriented silicon steel sheet (strip).


The use of amorphous strips.


Compared with crystalline alloys, amorphous alloys have undergone significant changes in physical, chemical and mechanical functions.


Taking iron-based amorphous alloys as an example, it has the characteristics of high saturation magnetic induction and low loss. Due to such characteristics, amorphous alloy materials have a broad space for use in many fields such as electronics, aviation, aerospace, machinery, and microelectronics. For example, it is used in the aerospace field to reduce the power and equipment components and add payload. Used in civil power and electronic equipment, it can greatly reduce the size of the power supply, improve efficiency, and enhance anti-interference ability. Miniature cores can be used in many transformers in ISDN. Amorphous strips are used to make sensor tags for anti-theft systems in supermarkets and libraries. The magical effect of amorphous alloys has broad market prospects.


At present, with the development of electronic technology in the direction of high frequency and miniaturization, amorphous and ultra-microcrystalline soft magnetic alloy materials have been made into various magnetic devices to replace silicon steel, ferrite and permalloy, etc., used in the power industry and electronics industry. And in the field of power electronics technology, used as transformers, reactors, filters, transformers, and sensors for current transformers, high-power switching power supplies, inverter power supplies, and program-controlled switch power supplies.

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