A kind of preparation method of high performance mnzn soft magnetic ferrite material

Abstract

The invention belongs to the technical field of ferrite, and in particular relates to a preparation method of a high-performance MnZn soft magnetic ferrite material, comprising the following steps: (1) preparing materials; (2) molding: a. pressing the corners in the direction of the mold up and down Design chamfering; b. Design process fillets on the inner and outer corners of the side of the blank; c. Design the shrinkage rate of the mold to be 1.15-1.2mm, and press molding to make the green blank molding density reach 2.8-3.6g / cm 3 ; (3) Place in the open air for 24-72 hours; (4) Sintering: a. Form a negative pressure in the heating section at 500°C; b. Raise the temperature to 950-1050°C, and control the equilibrium oxygen partial pressure at 6.5% by adding nitrogen The following; c. The sintering temperature is 1200-1400° C., the temperature is kept for 2-10 hours, and the MnZn soft magnetic ferrite material is obtained after cooling out of the furnace. The invention can effectively improve the electromagnetic properties of the MnZn soft magnetic ferrite material, and significantly improve the sintering density and mechanical strength of the magnetic core.

Description

technical field [0001] The invention belongs to the technical field of ferrite, and in particular relates to a preparation method of a high-performance MnZn soft ferrite material. Background technique [0002] MnZn soft magnetic power ferrite core is the heart of switching power supply module converter / inverter, widely used in communication, automotive electronics, flat panel display, photovoltaic / wind energy and other fields, and is the realization of small size, high efficiency, energy saving and High-reliability key supporting magnetic functional materials for electronic information. [0003] The urgent need for intelligent integration and plane mounting of electronic power systems has promoted the development of small, lightweight and high-frequency switching power supplies. However, as the operating frequency and temperature increase, the core loss of the conventional soft ferrite material will increase sharply, which will cause the switching power supply to viciously ...

AI Technical Summary

Problems solved by technology

However, as the operating frequency and temperature increase, the core loss of the conventional soft ferrite material will increase sharply, which will cause the switching power supply to viciously heat up or even burn out; if the high temperature Bs of the material is too low, the core will work in a tendency In the near-saturation stage, the inductance drops sharply, the current surges, and the transformer burns out; if the mechanical strength of the magnetic core does not meet the requirements, it will be damaged and cracked when it is subjected to external force during the winding process of the coil or during the power movement / vibration process, resulting in automatic winding. Production line failure or power system failure

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