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Iron-based amorphous alloy: The main elements are iron, silicon, boron, carbon, phosphorus, etc. They are characterized by strong magnetism (saturated magnetic induction intensity up to 1.4-1.7T), soft magnetic properties better than silicon steel sheet, low price, most suitable for replacing silicon steel sheet, as the iron core of low-frequency transformers (generally below 10 kHz ), such as distribution transformers, intermediate frequency transformers, high-power inductors, reactors, etc.
Iron-nickel-based amorphous alloys: mainly composed of iron, nickel, silicon, boron, phosphorus, etc., their magnetic properties are relatively weak (saturation magnetic induction intensity is about 1T or less), the price is relatively high, but the permeability is relatively high, and can replace silicon steel sheets Or Permalloy, used as the core of high-demand medium and low frequency transformers, such as leakage switch transformers.
Cobalt-based amorphous alloy: It is composed of cobalt, silicon, boron, etc. Sometimes other elements are added in order to obtain some special properties. Because of the cobalt content, they are very expensive and have weak magnetic properties (saturation magnetic induction is generally below 1T). However, the permeability is extremely high, and it is generally used in transformers and inductors in demanding military power supplies to replace permalloy and ferrite.
Iron-based nanocrystalline alloys (ultramicrocrystalline alloys): They are composed of iron, silicon, boron and a small amount of copper, molybdenum, niobium, etc., among which copper and niobium are essential elements for obtaining a nanocrystalline structure. They are first made into amorphous strips, and then appropriately annealed to form a mixed structure of microcrystalline and amorphous. Although this material is cheap, it has excellent magnetic properties and is almost comparable to cobalt-based amorphous alloys. It is an ideal material for industrial and civilian medium and high frequency transformers, transformers, and inductors. It is also a replacement product for permalloy and ferrite. .
Advantages of amorphous alloys
high strength and toughness: significantly higher than traditional steel materials, can be used as composite reinforcement materials, such as fishing rods. Abroad, bulk amorphous alloys have been used in golf ball heads and miniature gears. Amorphous alloy wire may be used in structural parts for strengthening. In addition, amorphous alloys have excellent wear resistance, coupled with their magnetic properties, it is possible to manufacture various magnetic heads.
Excellent magnetic properties: Compared with traditional metal magnetic materials, amorphous alloys have disorderly arrangement of atoms, no crystal anisotropy, and high resistivity, so they have high permeability and low loss, and are excellent soft magnetic materials. Materials, instead of silicon steel, permalloy and ferrite 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. For details, please see the application of amorphous alloys.
Flexible processing technology: Compared with other magnetic materials, amorphous alloys have a wide range of chemical composition, and even the same material can easily obtain the required magnetic properties through different subsequent processing. 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 traditional thin steel plates as an example, from steelmaking, casting, ingot blooming, blooming, annealing, hot rolling, annealing, pickling, finishing, shearing to finished thin plates, several technological links and dozens of procedures are required. Due to the many links and complicated processes, traditional steel companies are big energy-consuming and polluting companies, and are known as "water tigers" and "electric tigers". The manufacturing of amorphous alloys is directly sprayed after steelmaking, and the finished thin ribbon is manufactured in one step. The process is greatly simplified, a lot of precious energy is saved, and there is no emission of pollutants, which is very beneficial to environmental protection.
It is precisely because the amorphous alloy manufacturing process is energy-saving, and at the same time, its excellent magnetic properties can reduce the loss during the use of the transformer, so it is called the green material and the material of the 21st century.
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