Production method of ultrahigh magnetic permeability of iron-based nanocrystalline magnetic powder core

Abstract

The invention belongs to the technical field of alloy soft magnetic powder cores and particularly relates to a production method of an ultrahigh magnetic permeability of iron-based nanocrystalline magnetic powder core. The production method comprises step 1, performing mechanical crushing treatment on an iron-based nanocrystalline thin belt so as to obtain iron-based nanocrystalline powder; step 2, screening and matching the iron-based nanocrystalline powder and mixing into mixed powder which is formed by coarse powder and fine powder; step 3, performing passivation, coupling and insulation coating treatment on the mixed powder in turn through a passivation agent, a coupling agent, an insulating agent and a binding agent and performing compression forming; step 4, performing annealing treatment and spraying insulation treatment on the formed magnetic powder core in turn. According to the production method of the ultrahigh magnetic permeability of iron-based nanocrystalline magnetic powder core, the coarse powder and fine powder mixing and coupling treatment is adopted and accordingly the problem of the compression forming of large particle nanocrystalline powder can be effectively solved and the ultrahigh magnetic permeability of iron-based nanocrystalline magnetic powder core can be produced, wherein the magnetic permeability can reach more than 200.

Description

technical field [0001] The invention belongs to the technical field of alloy soft magnetic powder cores, and in particular relates to a preparation method of an iron-based nanocrystalline magnetic powder core with ultrahigh magnetic permeability. Background technique [0002] With the development of the electronics industry, a large number of applications of various switching power supplies require a magnetic powder core with high magnetic permeability, low loss, and good AC-DC superposition performance at a frequency of 10kHz-200kHz to make an inductor core, which is generally made of sendust aluminum alloy. The iron core is also called alloy magnetic powder core, and its relative magnetic permeability does not exceed 200 at the highest. For example, the Chinese invention patent application CN 101090019 A "Manufacturing method of high magnetic permeability FeSiAl magnetic powder core" discloses a magnetic permeability of 150 The manufacturing method of FeSiAl magnetic powde...

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Problems solved by technology

[0006] However, this method has the following defects: 1. The magnetic permeability of the obtained nanocrystalline magnetic powder core is still low, which cannot meet the requirements of the motor; The gap is large, it is difficult to press and form

[0008] In summary, there are no reports on nanocrystalline magnetic powder cores with a magnetic permeability of more than 200 and their preparation methods in the prior art; there are no reports in the prior art that can effectively solve the problem of large-particle nanocrystalline powder compression molding