High-superposition and high-permeability ferrite material and preparation method thereof

Abstract

The invention belongs to the technical field of ferrite preparation, and discloses a high-superposition and high-permeability ferrite material and a preparation method thereof. The high-superposition and high-permeability ferrite material comprises raw materials, auxiliary additives and an MgCo-Z type hexagonal dopant, the raw materials comprise a mixture of composite carbonyl iron powder, Mn3O4, ZnO and NiO, the content of the composite carbonyl iron powder is 58.8-61.5 mol%, the content of the ZnO is 19.5-21.0 mol%, the content of the NiO is 5.5-6.0 mol%, and the balance is Mn3O4; The auxiliary additives comprise at least four of CaCO3, Nb2O5, Bi2O3, V2O5 and MoO3, on the basis of a traditional ternary formula system, a small amount of NiO is added to form a quaternary formula system, the saturation magnetic flux density and the magnetic conductivity of the material can be improved, the ferrite formed under the synergistic effect of the additives guarantees high Curie temperature and high initial magnetic conductivity, power loss can be greatly reduced, and high saturation magnetic flux density and superposition capability can be maintained.

Description

technical field [0001] The invention belongs to the technical field of ferrite synthesis, in particular to a ferrite material with high superposition and high magnetic permeability and a preparation method thereof. Background technique [0002] In the field of communication, the materials used for the magnetic core of network transformers are generally in the range of magnetic permeability 4000-10000. This type of network transformer mainly plays the role of signal transmission, impedance matching, and electrical isolation. In order to avoid signal transmission errors , It is generally required that the material used in the magnetic core has low harmonic distortion and high magnetic permeability. As the core device of network signal transmission, the magnetic core directly affects the distortion of the transmission signal. Since the network transmission signal contains a large voice signal, this part of the signal contains a large DC component. When using ordinary magnetic p...

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Problems solved by technology

As the core device of network signal transmission, the magnetic core directly affects the distortion of the transmission signal. Since the network transmission signal contains a large voice signal, this part of the signal contains a large DC component. When using ordinary magnetic permeability When the material is 5000 or 10000, the inductance often drops when the magnetic permeability encounters a voice signal with a large DC component. One of the main reasons is that the saturation magnetic flux density of these materials is relatively low, only It is about 420mT, and the Curie temperature of these materials is generally low, and the material with a magnetic permeability of 10,000 is generally only 130°C. In some harsh application environments, the safety margin is insufficient.

[0003] For example, the patent document CN 102693807 A of DMEGC discloses a MnZn power ferrite with ultra-wide temperature, low loss and high magnetic flux density and its preparation method. , 200mT, 25°C power consumption ≤390mW / cm3, 120°C power consumption ≤330mW / cm3, 140°C power consumption ≤400mW / cm3, under 1194A / m, 50Hz conditions, 25°C saturation magnetic Flux density ≥ 540, this material has good wide temperature and low loss performance, but it cannot avoid the phenomenon of harmonic distortion failure and impedance matching error caused by the inductance drop of the magnetic core when the network transformer encounters a DC component

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