Today Xiaobian mainly take you to understand the classification of soft magnetic materials, partners in need to hurry to understand it.

　　1. Silicon steel

　　Silicon steel is an alloy. The fe-silicon alloy formed by adding a small amount of silicon (generally less than 4.5%) to pure iron is called silicon steel. This kind of iron core has.. High saturation magnetic induction value is 20000 gauss; They are widely used in the power electronics industry, such as power transformers, distribution transformers, current transformers and other iron cores, because of their good magnetoelectric performance, easy mass production, cheap price and small mechanical stress. Soft magnetic material is the output and use of large materials. It is also a large amount of magnetic material used in power transformers. Especially in low frequency, high power.. Is applicable. Commonly used are cold-rolled silicon steel sheet DG3, cold-rolled unoriented electrical steel strip DW, cold-rolled oriented electrical steel strip DQ, suitable for all kinds of electronic systems, domestic electrical appliances in low power and low frequency transformer and choke, reactor, inductor core, this kind of alloy toughness is good, can be blanking, cutting and other processing, iron core has laminated and winding. However, the loss increases sharply under high frequency, and the general use frequency is not more than 400Hz. From the application point of view, the choice of silicon steel to consider two factors: magnetism and cost. For small motor, reactor and relay, optional pure iron or low silicon steel sheet; For large motor, high silicon hot rolled silicon steel sheet, single orientation or non-orientation cold rolled silicon steel sheet can be selected; Single orientation cold rolled silicon steel sheet is often used for transformers. When used at the power frequency, the thickness of the commonly used strip is 0.2~0.35 mm; When used at 400Hz, the thickness of 0.1mm is usually selected as appropriate. The thinner the thickness, the higher the price.

　　2. Permoly

　　Permo alloy is often referred to as an iron - nickel alloy with a nickel content in the range of 30-90%. It is a soft magnetic alloy widely used. Magnetic properties can be effectively controlled by appropriate processes, such as initial permeability of over 100,000, large permeability of over 1 million, coercivity as low as 2 parts per thousand ost.

　　Or close to zero rectangular coefficient, Permo alloy with face-centered cubic crystal structure has good plasticity, can be processed into 1 micron ultra-thin strip and a variety of uses. Commonly used alloys are 1J50, 1J79, 1J85 and so on. The saturation magnetic induction strength of 1J50 is slightly lower than that of silicon steel, but the permeability is dozens of times higher than that of silicon steel, and the iron loss is also 2~3 times lower than that of silicon steel. Make a higher frequency (400~8000Hz) transformer, no load current is small, suitable for making a small type of higher frequency transformer below 100 watts. 1J79 has good comprehensive performance, suitable for high frequency low voltage transformer, leakage protection switch core, common mode inductor core and current transformer core. The initial permeability of 1J85 can reach more than 100,000, suitable for low frequency or high frequency input/output transformers for weak signals, common mode inductors and high precision current transformers.

　　3. Amorphous alloy (Amorphous alloys)

　　Silicon steel and Permoly soft magnetic materials are crystalline materials, atoms do regular arrangement in three-dimensional space, forming periodic lattice structure, there are grains, grain boundaries, dislocation, gap atoms, magnetic anisotropy and other defects, adverse to soft magnetic properties. From the perspective of magnetic physics, the amorphous structure with irregular arrangement of atoms, no periodicity and grain boundary is ideal for obtaining excellent soft magnetic properties. Amorphous metals and alloys is a new material field that was developed in the 1970s. Its preparation technology is completely different from the traditional method, but uses the cooling rate of about one million degrees per second of super rapid solidification technology, from the liquid steel to the finished product of thin strip molding, compared with the ordinary cold rolling metal strip manufacturing process to reduce many intermediate processes, this new process is called a revolution to the traditional metallurgical process. Due to super quenching solidification, alloy solidification atoms have no time to order arrangement crystallization, the solid alloy is a long-range unordered structure, there is no crystal alloy grains, grain boundaries exist, called amorphous alloy, known as a revolution in metallurgical materials science. This amorphous alloy has many unique properties, such as excellent magnetism, corrosion resistance, wear resistance, high strength, hardness and toughness, high resistivity and electromechanical coupling properties. Because of its excellent performance and simple process, it has been the focus of the research and development of materials science at home and abroad since the 1980s. At present, the United States, Japan, Germany has... Production scale, and a large number of amorphous alloy products gradually replaced silicon steel and permoly and ferrite poured into the market. Common types of amorphous alloys are: iron - based, iron - nickel - based, cobalt - based amorphous alloys and iron - based nanocrystalline alloys.