Iron-based amorphous alloy: the main elements are iron, silicon, boron, carbon, phosphorus, etc. They are characterized by strong magnetism (saturation magnetic induction can reach 1.4-1.7T), soft magnetic properties are better than silicon steel sheets, and the price is cheap. They are most suitable for replacing silicon steel sheets as iron cores for medium and low frequency transformers (generally below 10 kHz. ), such as distribution transformers, intermediate frequency transformers, high-power inductors, reactors, etc. Iron-nickel-based amorphous alloy: mainly composed of iron, nickel, silicon, boron, phosphorus, etc., their magnetism is relatively weak (the saturation magnetic induction is about 1T or less), the price is more expensive, but the magnetic permeability is relatively high, and can replace silicon steel sheet Or permalloy, used as high-demand medium and low-frequency transformer cores, such as leakage switch transformers. Cobalt-based amorphous alloy: It is composed of cobalt, silicon, boron, etc. Sometimes other elements are added to obtain some special properties. Due to the cobalt content, they are very expensive and have weak magnetism (the saturation magnetic induction is generally below 1T). However, the magnetic permeability is extremely high, and it is generally used in transformers and inductors in military power supplies with strict requirements, replacing permalloy and ferrite. Iron-based nanocrystalline alloys (ultramicrocrystalline alloys): They are composed of iron, silicon, boron, and a small amount of copper, molybdenum, and niobium, among which copper and niobium are essential elements for obtaining nanocrystalline structures. They are first made into amorphous strips and then properly annealed to form a mixed structure of microcrystalline and amorphous. Although this material is cheap, its magnetic properties are excellent, almost comparable to that of cobalt-based amorphous alloys. It is an ideal material for industrial and civil high-frequency transformers, transformers, and inductors, and it is also a replacement product for Permalloy and ferrite. . Advantages of amorphous alloys High strength and toughness: significantly higher than traditional steel materials, and can be used as composite reinforcement materials, such as fishing rods. Foreign countries have applied bulk amorphous alloys to golf racket heads and micro-gears. Amorphous alloy wires may be used in structural parts for strengthening. In addition, amorphous alloys have excellent wear resistance, and together with their magnetic properties, various magnetic heads can be manufactured. Excellent magnetism: Compared with traditional metal magnetic materials, due to the disordered arrangement of amorphous alloy atoms, there is no crystal anisotropy, and the resistivity is high, so it has high magnetic permeability and low loss, and is an excellent soft magnetic material. Materials, instead of silicon steel, permalloy and ferrite, etc. as transformer cores, transformers, sensors, etc., can greatly improve transformer efficiency, reduce volume, reduce weight, and reduce energy consumption. The magnetic properties of amorphous alloys are actually the most important application field of amorphous alloys so far. It can be seen from the figure that the amorphous nanocrystalline soft magnetic alloy has an ideal combination of high saturation magnetic induction and high magnetic permeability. Please see Applications of Amorphous Alloys for details. Flexible treatment process: Compared with other magnetic materials, amorphous alloys have a wide chemical composition range, and even the same material can easily obtain the required magnetic properties through different subsequent treatments. Therefore, the magnetic properties of amorphous alloys are very flexible, and there is a lot of choice, which provides convenience for the selection of power electronic components. Simple manufacturing process, energy saving and environmental protection. Taking the traditional thin steel plate as an example, several technological links and dozens of processes are required from steelmaking, casting, ingot billeting, preliminary rolling, annealing, hot rolling, annealing, pickling, finishing rolling, shearing to finished thin plate. Due to many links and complex processes, traditional iron and steel enterprises are large energy-consuming and polluting households, known as 'water tigers' and 'electric tigers'. The manufacture of amorphous alloys is directly sprayed after steelmaking, and only one step is required to produce thin strips. The process is greatly simplified, saving a lot of precious energy, and there is no pollutant emission, which is very beneficial to environmental protection. It is precisely because the manufacturing process of amorphous alloys saves energy, and at the same time, its excellent magnetic properties reduce the loss of transformers during use, so they are called green materials and materials of the 21st century.