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Both silicon steel and permalloy soft magnetic materials are crystalline materials. The atoms are regularly arranged in three-dimensional space to form a periodic lattice structure. There are grains, grain boundaries, dislocations, interstitial atoms, magnetocrystalline anisotropy, etc. Defects are unfavorable to soft magnetic properties.From the perspective of magnetic physics, the irregular arrangement of atoms, the absence of periodicity and the amorphous structure of grain boundaries are ideal for obtaining excellent soft magnetic properties. Amorphous metals and alloys are a new material field that came out in the 1970s.Its preparation technology is completely different from the traditional method, but adopts the super rapid solidification technology with a cooling rate of about 1 million degrees per second. From the molten steel to the finished strip, it is formed at a time, which is better than the general cold-rolled metal strip manufacturing process. Many intermediate processes are reduced, and this new process is called a revolution to traditional metallurgical processes.Due to the super-rapid solidification, the atoms cannot be ordered and crystallized when the alloy is solidified. The obtained solid alloy has a long-range disordered structure without the crystal grains and grain boundaries of the crystalline alloy. It is called an amorphous alloy and is called a metallurgical material.
A revolution in learning.This amorphous alloy has many unique properties, such as excellent magnetic properties, corrosion resistance, wear resistance, high strength, hardness and toughness, high electrical resistivity and electromechanical coupling properties. Because of its excellent performance and simple process, it has become the focus of research and development in materials science at home and abroad since the 1980s. The United States, Japan, and Germany already have complete production scales, and a large number of amorphous alloy products have gradually replaced silicon steel, permalloy and ferrite into the market.
Since the 1970s, China has started the research and development of amorphous alloys. After the completion of major scientific and technological projects during the "Sixth Five-Year Plan", "Seventh Five-Year Plan" and "Eighth Five-Year Plan" periods, a total of 134 scientific research results have been obtained and the National Invention Award There are 2 items, 16 items have been won, and there are nearly a hundred alloy varieties.
The Central Iron and Steel Research Institute currently has four amorphous alloy strip production lines and one amorphous alloy component iron core production line. Production of various shaped iron-based, iron-nickel-based, cobalt-based and nanocrystalline strips and iron cores, suitable for iron core components of inverter power supplies, switching power supplies, power transformers, leakage protectors, and inductors, with an annual output value of nearly 2000 Ten thousand yuan. During the "Ninth Five-Year Plan", a thousand-ton iron-based amorphous production line is being established, and it has entered the ranks of the international advanced level.
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