CN104775014A - Heat treatment method of amorphous/microcrystalline iron-base magnetic cores - Google Patents

Abstract

The invention relates to a heat treatment method of amorphous/microcrystalline iron-base magnetic cores, which comprises the following steps: (1) sequentially putting prepared magnetic cores into a vacuum heat treatment furnace, wherein the initial value in the closed state is -0.1 MPa; (2) heat treatment time and temperature: dividing the step into 4 stages, adopting a uniform-speed heating process for each heating stage, and keeping the temperature after each heating stage is finished; and (3) after finishing keeping the temperature, discharging, and quickly cooling to normal temperature within 120 minutes in an air cooling mode, thereby obtaining the qualified amorphous/microcrystalline iron-base magnetic cores. By adopting the heat treatment method, the obtained magnetic core has the advantages of excellent corrosion resistance, excellent magnetic stability, high saturation induction density, high initial magnetoconductivity, high temperature stability and high anti-interference performance.

Description

A kind of amorphous/crystallite iron-based magnetic core heat treating method

Technical field

The invention belongs to field of electromechanical technology, particularly a kind of amorphous/crystallite iron-based magnetic core heat treating method.

Background technology

Amorphous/crystallite iron-based magnetic core can be applicable to mutual inductor, reactor, inducer, power switch power source, inverter, magnetic amplifier, high-frequency transformer, high-frequency converter, high-frequency chocke iron core, earth leakage circuit-breaker, common mode inductance etc.; these are all indispensable elements in power system, electronic system; and magnetic core is very crucial part, what magnetic core adopted usually is banded iron-base nanometer crystal alloy material.But due to the difference of thermal treatment process, adopt the thermal treatment scrap rate of iron-base nanometer crystal alloy material produce magnetic core at present always between 30 ~ 40 ‰, cause production cost higher, also affect the performance of power system, electronic system simultaneously.

Summary of the invention

The object of this invention is to provide a kind of method that can improve amorphous/crystallite iron-based magnetic core thermal treatment qualification rate.

A kind of amorphous/crystallite iron-based magnetic core heat treating method, its concrete steps are:

(1), by the magnetic core that coiling is good put into vacuum heat treatment furnace according to the order of sequence, initial value is-0.1MPa in the closed state;

(2), heat treatment time and temperature:

First stage: temperature is at the uniform velocity warming up to 260 DEG C from room temperature, 30 minutes used times, then temperature is remained on 260 DEG C, be incubated 60 minutes;

Subordinate phase: temperature is at the uniform velocity warming up to 380 DEG C from 260 DEG C, 30 minutes used times, then remains on 380 DEG C by temperature, is incubated 60 minutes;

Phase III: temperature is at the uniform velocity warming up to 490 DEG C from 380 DEG C, 30 minutes used times, then temperature is remained on 490 DEG C, be incubated 60 minutes;

Fourth stage: temperature is at the uniform velocity warming up to 560 DEG C from 490 DEG C, 90 minutes used times, then remains on 560 DEG C by temperature, is incubated 150 minutes;

(3) magnetic core insulation end is come out of the stove, and adopts air-cooled quick cooling 120 minutes to normal temperature, obtains qualified amorphous/crystallite iron-based magnetic core.

Adopt heat treating method of the present invention, the solidity to corrosion of obtained magnetic core and magnetic stability are very good, have high saturated magnetic induction and high initial magnetic permeability, also have remarkable temperature stability and immunity from interference.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of illustrated heat treating method.

Embodiment

Iron-base nanometer crystal alloy is main by ferro element, add a small amount of Nb, Cu, a kind of amorphous material that alloy that Si, B element are formed is formed through fast solidification technology, this amorphous material after heat treatment Dispersed precipitate, on amorphous matrix, is called as crystallite or nanocrystalline material.Nanocrystalline material has excellent comprehensive magnetic energy, its high saturated magnetic strength, high initial magnetoconductivity, resistivity are all good than permalloy, through vertical or horizontal magnetic field treatment, high Br (0.9) or low Br value (1000Gs) can be obtained, be over-all properties best material in the market, there is better solidity to corrosion and magnetic stability.Amorphous and nanocrystalline strip itself are through and fast cool down, such band will produce stress because of Imbalance in weight, and amorphous and nanocrystalline magnetic property counter stress are highstrung, so the magnetic performance of the stress raising material of material internal will be eliminated through Overheating Treatment.But because the difference of thermal treatment process, current magnetic core is always maintained between 30 ~ 40 ‰ at the scrap rate of heat treatment step, and scrap rate is higher, causes production cost high.Therefore manufacturing enterprise has carried out test of many times for this difficult problem, develop a kind of heat treating method that can improve magnetic core mass and stability.

A kind of amorphous/crystallite iron-based magnetic core heat treating method, its concrete steps are:

(1), by the magnetic core that coiling is good put into vacuum heat treatment furnace according to the order of sequence, initial value is-0.1MPa in the closed state;

(2), heat treatment time and temperature:

First stage: temperature is at the uniform velocity warming up to 260 DEG C from room temperature, 30 minutes used times, then temperature is remained on 260 DEG C, be incubated 60 minutes;

Subordinate phase: temperature is at the uniform velocity warming up to 380 DEG C from 260 DEG C, 30 minutes used times, then remains on 380 DEG C by temperature, is incubated 60 minutes;

Phase III: temperature is at the uniform velocity warming up to 490 DEG C from 380 DEG C, 30 minutes used times, then temperature is remained on 490 DEG C, be incubated 60 minutes;

Fourth stage: temperature is at the uniform velocity warming up to 560 DEG C from 490 DEG C, 90 minutes used times, then remains on 560 DEG C by temperature, is incubated 150 minutes;

(3) be incubated end to come out of the stove, adopt air-cooled quick cooling 120 minutes to normal temperature; Obtain qualified amorphous/crystallite iron-based magnetic core.

Fig. 1 is the schematic diagram of magnetic core thermal treatment process of the present invention.

Adopt heat treating method of the present invention and prior heat treatment method to obtain magnetic core technical indicator to be compared as follows:

Can be found out by upper table contrast, adopting the condemnation factor of heat treating method obtained magnetic core of the present invention to reduce to by 40 ‰ is 1 ~ 2 ‰, and condemnation factor reduces greatly, reduces production cost.Initial permeability and saturation magnetic induction are also greatly improved simultaneously.Adopt the stability of the core material after heat treating method thermal treatment of the present invention and interference free performance very good, therefore, also substantially increase integral product quality.

Heat treating method of the present invention is applicable to the iron core of mutual inductor, reactor, inducer, power switch power source, inverter, magnetic amplifier, high-frequency transformer, high-frequency converter, high-frequency chocke, earth leakage circuit-breaker, common mode inductance etc.

Claims (1)

1. amorphous/crystallite iron-based magnetic core heat treating method, is characterized in that: the concrete steps of described magnetic core heat treating method are:

(1), by the magnetic core that coiling is good put into vacuum heat treatment furnace according to the order of sequence, initial value is-0.1MPa in the closed state;

(2), heat treatment time and temperature:

First stage: temperature is at the uniform velocity warming up to 260 DEG C from room temperature, 30 minutes used times, then temperature is remained on 260 DEG C, be incubated 60 minutes;

Subordinate phase: temperature is at the uniform velocity warming up to 380 DEG C from 260 DEG C, 30 minutes used times, then remains on 380 DEG C by temperature, is incubated 60 minutes;

Phase III: temperature is at the uniform velocity warming up to 490 DEG C from 380 DEG C, 30 minutes used times, then temperature is remained on 490 DEG C, be incubated 60 minutes;

Fourth stage: temperature is at the uniform velocity warming up to 560 DEG C from 490 DEG C, 90 minutes used times, then remains on 560 DEG C by temperature, is incubated 150 minutes;

(3) magnetic core insulation end is come out of the stove, and adopts air-cooled quick cooling 120 minutes to normal temperature; Obtain qualified amorphous/crystallite iron-based magnetic core.