Amorphous core

In the past thousands of years, all the metals or alloys used by human beings are crystalline materials, whose atoms are arranged orderly in three-dimensional space, forming periodic lattice structure. Amorphous metal or alloy, also known as metallic glass, refers to a kind of material with amorphous (also known as glassy) structure obtained by some form of non-equilibrium process of molten metal or alloy, which is usually obtained by rapid quenching in molten state. Because the atoms of a metal or alloy do not have enough time to arrange and crystallize in order when it solidifies, and the metal or alloy does not undergo nucleation, growth and other crystallization processes, but retains the condensed state of disordered arrangement of liquid atoms at room temperature or low temperature, its atoms no longer grow in order, periodicity and regular arrangement, but in a long-term disordered arrangement state, so it gives a lot of special properties to amorphous materials, such as For example, high strength and hardness, good corrosion resistance, soft magnetism, invar characteristics, Irene characteristics, superconductivity, radiation damage resistance, etc. Therefore, it can be widely used in manufacturing industry, such as manufacturing tools, springs, gears, electrodes, magnetic heads, magnetic separators, sensors, transformers and composite materials. In the literature, the terms "amorphous", "amorphous", "glassy" and "amorphous" are used interchangeably.

Ferromagnetic properties are an important aspect of amorphous alloys. The amorphous gold alloy with ferromagnetism is also called ferromagnetic metal glass or magnetic glass. It has high saturation magnetization, low coercive force, high permeability and large magnetostrictive coefficient. For the convenience of description, the following are all called amorphous alloys. The magnetic loss of amorphous alloy is lower than that of other known crystalline alloy. The resistivity of amorphous alloy is higher than that of similar crystalline alloy, and the temperature coefficient of resistivity is a small negative value, so the eddy current loss of material can be greatly reduced. Ultra thin amorphous alloy strip has excellent high frequency performance. At 1MHz high frequency, the loss of 5.5 μ m thick amorphous alloy core is 2 / 5 of that of high frequency ferrite, only 1 / 3 of that of super permalloy.

For amorphous soft magnetic alloys, they can be divided into two categories: high saturation magnetic induction and high permeability.

According to its main components, it can be divided into: (1) Fe based soft magnetic alloy with high saturation magnetic induction; (2) Fe Ni based amorphous alloy with medium saturation magnetic induction and good soft magnetic properties; (3) cobalt based alloy with excellent soft magnetic properties with saturation magnetostrictive coefficient close to zero.

Iron based amorphous iron core: it has the highest saturation magnetic induction strength (1.45t-1.56t) in almost all amorphous alloy iron cores, and has high permeability, low coercive force, low loss, low exciting current, good temperature stability and aging stability. It is mainly used to replace silicon steel sheet as power frequency distribution transformer and intermediate frequency transformer of various forms and different powers, with working frequency ranging from 50Hz to 10kHz; as reactor core of high-power switching power supply, its working frequency can reach 50KHz.

Fe Ni based amorphous iron core: medium low saturation magnetic induction strength (0.75T), high permeability, low coercive force, wear resistance and corrosion resistance, good stability. It is commonly used to replace permalloy core as zero sequence current transformer core in leakage switch.

Cobalt based amorphous iron core: it has the highest permeability among all amorphous alloy iron cores, medium low saturation magnetic induction strength (0.65t), low coercive force, low loss, excellent wear resistance and corrosion resistance, good temperature stability and aging stability, and impact vibration resistance. It is mainly used to replace permalloy core and ferrite core to make high frequency transformer, filter inductor, magnetic amplifier, pulse transformer, pulse compressor and other applications in high-end fields.