Nanocrystalline magnetic cores: the "secret" of amorphous ribbons!

What is amorphous strip? In daily life, people usually come into contact with two kinds of materials: one is crystalline material and the other is amorphous material. The so-called crystalline material refers to the material in which the atomic arrangement inside follows a certain rule. On the contrary, if the internal atomic arrangement is in a disordered state, it is an amorphous material. The general metal, whose internal atomic arrangement is orderly, belongs to the crystalline material.
Scientists have found that after a metal is melted, its internal atoms are in an active state. Once the metal begins to cool, the atoms will slowly arrange themselves in an orderly manner according to certain crystalline laws as the temperature drops, forming crystals. If the cooling process is very fast, the atoms will be condensed before they have time to rearrange themselves, thus forming an amorphous alloy. The preparation of amorphous alloys uses a rapid condensation process. The high-temperature molten steel in a molten state is sprayed onto a high-speed rotating cooling roller. The molten steel cools rapidly at a rate of one million degrees per second, and it takes only one thousandth of a second to reduce the molten steel from 1300°C to below 200°C, forming an amorphous strip.

The main characteristics of amorphous clad crystals
1. Amorphous chrystals are composed of ferromagnetic elements (Fe, Ni, Co) and amorphous elements (Si, B, C);
2. Characteristics of amorphous composites: Low Coercivity, high magnetic permeability, low loss, low saturation magnetic induction, high resistivity, high temperature stability, excellent frequency characteristics and adjustability of magnetic functions;
3. After proper annealing, iron-based non-crystalline sheet (strip) shows lower specific total loss than oriented silicon steel sheet (strip).
Use of Amorphous Ribbon.

Compared with crystalline alloys, amorphous alloys have undergone significant changes in physical, chemical and mechanical functions.
Take the amorphous alloy mainly composed of iron as an example. It has the characteristics of high saturation magnetic induction intensity and low loss. Due to such characteristics, amorphous alloy materials have a wide range of applications in many fields such as electronics, aviation, aerospace, machinery, microelectronics, etc. For example, in the field of aerospace, it can reduce the weight of power supply and equipment and increase the effective load. When used in civil power and electronic equipment, it can greatly reduce the size of the power supply, improve efficiency, and enhance anti-interference ability. Micro-Iron Cores can be widely used in transformers in the Integrated Business Digital Network (ISDN). Amorphous strips are used to make sensor tags for supermarket and library anti-theft systems. The magical effects ofamorphous alloys have broad market prospects.
At present, with the development of electronic technology towards high frequency and miniaturization, amorphous ultra-fine crystal soft magnetic alloy materials have been made into various magnetic devices to replace silicon steel, ferrite and Permalloy, etc., and are used in the electric power industry, electronics industry and power electronics technology. They are used as transformers, reactors, filters, transformers, and sensors for current transformers, high-power switching power supplies, inverter power supplies and programmable switch power supplies.