is a ferromagnetic core made of ferromagnetic amorphous alloy. In the past thousands of years, the metals or alloys used by human beings are materials with crystalline structure, and their atoms are arranged in an orderly manner in three-dimensional space to form a periodic lattice structure. Amorphous metal or alloy, also called metallic glass, refers to a material with an amorphous (also known as glass) structure obtained from molten metal or alloy through some form of non-equilibrium process, usually by melting The state is obtained by rapid quenching. Because the atoms of the metal or alloy have no time to arrange and crystallize in an orderly manner when the metal or alloy is solidified, the metal or alloy does not go through the crystallization process such as nucleation and growth, but retains a condensed state of liquid atoms in a disordered arrangement at room temperature or low temperature, and its atoms no longer grow orderly , Periodic and regular arrangement, but in a state of long-range disordered arrangement, which endows amorphous materials with many special properties, such as high strength and hardness, good corrosion resistance, soft magnetism, Invar characteristics, Alinwa properties, superconductivity, resistance to radiation damage, etc. Therefore, it can be widely used in the manufacturing industry, such as for the manufacture of knives, springs, gears, electrodes, magnetic heads, magnetic separators, sensors, transformers and composite materials. In the literature, the terms 'amorphous', 'amorphous', 'glassy' and 'amorphous' etc. are used interchangeably.
Ferromagnetic properties are one of the most attractive aspects of amorphous alloys. Amorphous gold alloy with ferromagnetism is also called ferromagnetic metallic glass or magnetic glass (Glassy Alloy), which has high saturation magnetization, low coercivity, high permeability and large magnetostriction coefficient. For the convenience of description, they are referred to as amorphous alloys below. Amorphous alloys have lower magnetic losses than other known crystalline alloys. 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 the material can be greatly reduced. Ultra-thin amorphous alloy ribbon, its high frequency performance is excellent, at 1MHz high frequency, the loss of 5.5μm thick amorphous alloy iron core is 2/5 of high frequency ferrite, only 1 of super permalloy /3.
For amorphous soft magnetic alloys, according to the application of magnetic properties, they can be divided into two categories: high saturation magnetic induction intensity and high permeability amorphous soft magnetic alloys. According to its main components, it can be divided into: (1) Fe-based soft magnetic alloys with high saturation magnetic induction; (2) Fe-Ni-based amorphous alloys with medium saturation magnetic induction and good soft magnetic properties; (3) A cobalt-based alloy with excellent soft magnetic properties with a saturation magnetostriction coefficient close to zero.
Iron-based amorphous iron core: It has high saturation magnetic induction (1.45T～1.56T) in almost all amorphous alloy iron cores, and has high magnetic permeability, low coercive force, low loss, low excitation current and good temperature stability and aging stability. Mainly used to replace silicon steel sheets, as various forms and different power frequency distribution transformers, intermediate frequency transformers, the working frequency is from 50Hz to 10KHz; as a high-power switching power supply reactor core, the use frequency can reach 50KHz.
Iron-nickel-based amorphous iron core: medium to low saturation magnetic induction (0.75T), high magnetic permeability, low coercive force, wear-resistant and corrosion-resistant, and good stability. It is often used to replace the Permalloy iron core as the zero-sequence current transformer core
in the leakage switch.
Cobalt-based amorphous iron core: It has high magnetic permeability among all amorphous alloy iron cores, and has a medium to low saturation magnetic induction (0.65T), low coercive force, low loss, and excellent wear resistance And corrosion resistance, good temperature stability and aging stability, shock and vibration resistance. It is mainly used to replace permalloy iron core and ferrite iron core to make high-frequency transformer, filter inductor, magnetic amplifier, pulse transformer, pulse compressor and other applications in high-end fields.