Ferrite material, small high-current laminated chip broadband magnetic bead and its preparation method

Abstract

The invention discloses a ferrite material, small large-current laminated-chip wideband magnetic beads, and a preparation method thereof. The ferrite main materials comprise: 49-55mol% of Fe2O3, 25-35mol% of ZnO, 4-8mol% of CuO, 8-15mol% of NiO, 0.1-0.6mol% of Co3O4, 1-3mol% of Bi2O3, and 0.5-1.5mol% of Nb2O5. The magnetic bead preparation method comprises the steps of ferrite slurry preparation, material band dry preparation, cutting, ferrite material sheet punching, ferrite material sheet printing, ferrite material sheet lamination, cutting and forming, and the like. With the ferrite material, magnetic saturation degree is improved, and direct current resistance is reduced, such that larger current can be withstood. According to the magnetic bead preparation method, production period is shortened, and production efficiency is improved. The volume of the magnetic beads is small. The magnetic beads have good electromagnetic interference inhibition capacity from 100MHz to higher than 1GHz.

Description

technical field [0001] The invention belongs to the technical field of inductance, and in particular relates to a ferrite material, a small-sized high-current lamination-type broadband magnetic bead and a preparation method thereof. Background technique [0002] Magnetic beads are electronic components used to suppress high-frequency noise and spike interference on signal lines and power lines, and to absorb static pulses. With the development of high-speed digital circuits, the clock frequency is getting higher and higher, and it is required to expand the frequency range of electromagnetic interference to a wide frequency band, up to 1GHz or more. The pulse shape of the high-speed digital signal is steeper, so that the fundamental frequency increases. Therefore, chip ferrite beads that are required to be loaded into high-speed digital circuits must meet the following requirements: keep low impedance |Z| in the frequency band below 100MHz, so as not to cause distortion of t...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of the existing ferrite material made of magnetic beads with small frequency range and low current resistance, and provide a ferrite material

[0006] Another object of the present invention is to provide a manufacturing method of a small-scale high-current laminated broadband magnetic bead, which overcomes the shortcomings of long production cycle and low efficiency in the manufacture of laminated broadband magnetic beads in the prior art

[0007] Another object of the present invention is to provide a small high-current laminated chip broadband magnetic bead, which overcomes the shortcomings of the magnetic bead in the prior art, such as small frequency range and low current resistance

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