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Characteristics and uses of amorphous magnetic materials
The emergence and application of amorphous magnetic materials are mainly based on saving energy and improving the efficiency of equipment or components. Amorphous magnetic materials are mainly used in two aspects: one is for electronic component devices, and the other is power supply equipment. . People use instruments and equipment, always hope that it has high efficiency and low loss. In the current era of energy crisis in the world, it will be of great significance. The structural characteristics of amorphous materials make amorphous materials have some excellent properties and uses:
(1) Since amorphous alloys do not have a crystalline structure, there are no problems with grain boundaries, dislocations, interplane slippage, grain defects, and local inhomogeneity of twin crystals. At the same time, due to the irregular and dense structure of the atoms The accumulation and coordination number are high, which is bound to be high strength, hard hardness, and good corrosion resistance in terms of mechanical properties (because the grain boundary and chemical unevenness are the main locations that suffer the first erosion).
(2) Due to the irregular arrangement of atoms in space, there is no inherent symmetry of the crystal system. The amorphous state is more uniform, tougher, and isotropic than the crystalline material. The magnetic anisotropy constant K is small, and the magnetic properties are soft. good. Due to the high sensitivity of the magnetic field in all directions, it can be used to construct a high-sensitivity magnetic field meter or a magnetic flux sensor. Has now developed a stress magnetic effect type high-sensitivity stress sensor, a magnetostrictive effect type mechanical sensor.
(3) Since the amorphous alloy is doped with glassy elements, the resistivity p is high, and the eddy current loss is less. Compared with the crystalline alloy, the frequency of use can be increased under the same conditions. This feature can be effectively used Developed a fast response sensor that is difficult to achieve with magnetic crystals.
(4) Curie temperature Tc (about 300-400℃) is higher than ferrite, but not as good as metal materials. When the Curie temperature is reached, the composition can be determined at will. Therefore, it is expected that the magnetic properties can be used to develop and develop a rapid response temperature sensor.
In summary, the characteristics of amorphous alloy magnetic materials are: high strength, hard hardness, good ductility, high resistivity, low coercivity, high permeability, low loss, corrosion resistance, radiation resistance, etc. Advantages, especially amorphous alloys such as Fe80B20, Fe5Co70Si15B10, etc., which have the rare advantage of extremely hard "hard" mechanical properties and surprisingly "soft" magnetic properties. Compared with the excellent features, it has also been widely used in real life.
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