Magnetic materials have a wide range of applications in modern life and science and technology. The development of new magnetic materials and their applications is an important aspect of modern high technology. New magnetic materials are constantly emerging. Next, I will introduce you to amorphous magnetic cores:
Characteristics and uses of amorphous magnetic material
The emergence and application of amorphous magnetic materials are mainly based on saving energy and improving the efficacy of equipment or components. Amorphous magnetic materials are mainly used in two aspects: one is for electronic component devices, and the other is for power equipment . When people use instruments and equipment, they always hope that it has high efficiency and less loss. In the current era of world energy crisis, 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 grain boundaries, dislocations, interplane slip, and grain defects. And the problem of local inhomogeneity of the contractile structure, and due to the random close packing of atoms and high coordination number of the constituent atoms, it is bound to have high mechanical properties, high hardness, and good corrosion resistance (due to grain boundaries and Chemical inhomogeneities are the main locations that suffer first erosion).
(2) Due to the irregular spatial arrangement of atoms, there is no inherent symmetry problem in the crystal system. Amorphous materials are more uniform and tougher than crystalline materials, and are isotropic, with a small magnetic anisotropy constant K and soft magnetic properties. it is good. Due to the high sensitivity of the anisotropic magnetic field, it can be used to form a high-sensitivity magnetic field meter or magnetic flux sensor. Stress magnetic effect type high-sensitivity stress sensors and magnetostrictive effect type mechanical sensors have been developed successively.
(3) Since the amorphous alloy is doped with glassy elements, the resistivity p is high, and the eddy current loss is small. Compared with the crystalline alloy, under the same conditions, the frequency of use can be increased. Effective use of this characteristic can A fast-response sensor that is difficult to achieve with magnetic crystals has been developed.
(4) Curie temperature Tc (about 300-400 ° C) is higher than that of ferrite, but not comparable to metal materials. When the Curie temperature is reached, its composition can be arbitrarily determined. Therefore, it is expected to develop a fast response temperature sensor by utilizing the magnetic properties. 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 and Fe5Co70Si15B10, they have the rare advantage that the mechanical properties are particularly hard and 'hard', and the magnetic properties are surprisingly 'soft'. Compared with the excellent characteristics, it also has a wide range of applications in real life.