CN103578680A

CN103578680A - Soft-magnetic inductive iron core material

Info

Publication number: CN103578680A
Application number: CN201310516570.1A
Authority: CN
Inventors: 任静儿
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-10-28
Filing date: 2013-10-28
Publication date: 2014-02-12

Abstract

The invention relates to a soft-magnetic inductive iron core material which comprises the following materials in percentage by weight: 8.5% of silicon, 4.37% of aluminum, 0.012% of boron, iron in balance amount and inevitable impurities. By adopting the technical scheme, the obtained soft-magnetic inductive iron core material has the advantages that not only is the magnetic loss reduced, but also the temperature coefficient is reduced.

Description

A kind of soft magnetism inductor core material

Technical field

The invention belongs to field of magnetic material, specifically refer to that a kind of material for inductor core forms.

Background technology

Now soft magnetism inductor core is mainly used in the aspects such as iron core of stablizing inductor core, low noise filter and pulse transformer that transducer uses in Switching Power Supply.Mainly with soft magnet silicon aluminium alloy powder core, produce soft magnetism inductor core now, its be mainly because higher resistivity and in low-intensity magnetic field, there is higher magnetic permeability, magnetic loss is low and energy storage capability is high, becomes the main material in soft magnetism field.

In the soft magnet silicon aluminium alloy now using, be substantially adopt silicon that percentage by weight is 8～12%, 4～7% aluminium, all the other are the alloy of iron.The pure iron soft magnetic core powder of the more former use of this alloy material is greatly improved aspect magnetic loss, but still can not meet the needs of some aspect.

Summary of the invention

The object of the invention is existing soft magnet silicon aluminium alloy to propose to improve technical scheme, by the technical program, can, in the situation that guaranteeing its original performance, reduce magnetic loss.

The present invention is achieved by the following technical solutions:

An inductor core material, its composition includes by weight percentage, 8.5% silicon, 4.37% aluminium, 0.012% boron, all the other are iron and inevitable impurity.

The invention has the beneficial effects as follows:

By the technical program, resulting soft magnetism inductor core material, not only aspect magnetic loss, decrease, and its temperature coefficient also reduces to some extent.

Embodiment

Describe by the following examples technical scheme of the present invention in detail.

This material is few with the difference of existing soft magnet silicon aluminium alloy in refining process, and its main production technology is:

In the Efco-Northrup furnace first Armco iron, silicon metal, fine aluminium being dropped in proportion, smelt, until material, all after fusing, drop into 0.012% boron, boron drops in borax mode, needs to breed after 30 minutes to cast after reaching smelting temperature; Need to be cooling fast under isothermal after being cast into ingot, cooling rate is not less than 30 ℃/min.

With mechanical means, alloy cast ingot coarse crushing is become to 25 millimeters of following material pieces, these material pieces are inserted after being incubated about 2 hours in the general reduction furnace with hydrogen shield atmosphere and under the temperature conditions of 1200 ℃ of left and right cooling, still use isothermal cooling fast herein, cooling rate is not less than 30 ℃/min; With jaw crusher, further these material pieces are broken into the material piece that is less than 5 millimeters again; with vibratory milling, be ground into the alloy powder below 100 orders again; this alloy powder is inserted and in the general reduction furnace with hydrogen shield atmosphere, under the temperature conditions of 900 ℃ of left and right, be incubated 1 hour and carry out stress annealing processing, afterwards screening.

According to 100～200 orders, accounting for 20%, 200～300 orders accounts for following total of 25%, 350 orders and accounts for 55% quality and allocate than the granularity of alloy powder, with potassium bichromate solution, carry out Passivation Treatment afterwards, surface at alloy powder forms coating film, with kaolin, insulate.

Bonding agent adopts the existing conventional material using, and the absolute ethyl alcohol and the ethyl acetate that the quality such as are about to mix, and then in stirring, slowly pours the commercially available magnetic bonding agent with the quality such as absolute ethyl alcohol into, to three completely mutually dissolving obtain glue, again 2.4% the glue that is equivalent to alloy powder quality is added in alloy powder, by mixer, be fully uniformly mixed, after granulation is dried, be sieved into and be less than 40 object powder, add again zinc stearate and make release agent, add in mould the pressure at 1000～1200MPa compressing alloy powder, vacuum in 1.5 handkerchief left and right, be incubated 15 minutes in the protective atmosphere heat-treatment furnace of 450 ℃ of left and right after, at this temperature, pressure, be that 1000～1200MPa carries out secondary compacting, vacuum after compacting about 1.5 handkerchiefs, in the protective atmosphere heat-treatment furnace of 600 ℃ of left and right, be incubated the heat treatment of removing compacting stress about 40 minutes, finally with the surface that modified form epoxy resin paint is coated in powder core, obtain soft magnetism inductor core.

Claims

1. a soft magnetism inductor core material, is characterized in that: its composition includes by weight percentage, 8.5% silicon, 4.37% aluminium, 0.012% boron, and all the other are iron and inevitable impurity.