CN102982947B - One contains Bi2O3The manufacture method of ferromagnetic core - Google Patents

Abstract

The invention discloses one and contain Bi₂O₃The manufacture method of ferromagnetic core, comprise the following steps: calculate by weight reduced iron powder 68-72, brown iron oxide 14-16, MnO2-3, ZnO2.5-4, modified oxidized iron powder 4-6, Bi₂O₃3-5、SnO₂1-3、CaCO₃1.5-2.5、Al₂O₃4-6, CuO1.5-2.5 prepare burden, then successively by pre-burning, ball milling, secondary ball milling, moulding and a sintering and get final product; Core formulation of the present invention is reasonable, and preparation method is simple, and the magnetic core saturation induction density making is higher, loss is lower, and heatproof is higher, and the present invention is simultaneously by adding modified oxidized iron powder composition, can be used as the bridge combination between different material, use feed distribution is better, and density is high, grain boundary resistance rate is high, the porosity is low, crystal grain is large and even, there will not be crackle when sintering, dense structure, be out of shape little, rational modification composition of raw materials, in sintering process, deformation extent is small; Can machined, can line cutting, cutting, grinding etc.

Description

One contains Bi2O3The manufacture method of ferromagnetic core

Technical field

The invention belongs to PM technique, be specifically related to one and contain Bi₂O₃The manufacture method of ferromagnetic core.

Background technology

The saturation induction density of magnetic powder core is generally about 9000-11000 Gauss, and in the alternating electric field of 100-2000 hertz, iron loss is very large. Sendust core saturation induction density is generally about 5000-9000 Gauss, and iron loss is also lower, but its material mechanical strength is too low; Ferritic saturation induction density is about 2700-4200 Gauss, and iron loss situation is quite good, but saturation induction density is too low, and should not cut.

Summary of the invention

In order to alleviate shortcomings and deficiencies of the prior art, the object of the present invention is to provide one to contain Bi₂O₃The manufacture method of ferromagnetic core.

The present invention adopts following technical scheme to achieve these goals:

Contain Bi₂O₃The manufacture method of ferromagnetic core, comprise the following steps:

(1) proportioning of raw material is calculating by weight, reduced iron powder 68-72, brown iron oxide 14-16, MnO2-3, ZnO2.5-4, modified oxidized iron powder 4-6, Bi₂O₃3-5、SnO₂1-3、CaCO₃1.5-2.5、Al₂O₃4-6, CuO1.5-2.5, described modified oxidized iron powder is prepared by the following method:

A, trees ashes are soaked after 2-3 hour with the sodium hydroxide solution of 15-18%;

B, use 15-18% hydrochloric acid solution soak 2-3 hour;

C, with deionized water washing 3-5 time, to trees ashes be neutrality, oven dry;

D, be ground to 0.8-1.0 μ m powder, obtain modification trees ashes;

E, in brown iron oxide, add and be equivalent to the modification trees ashes obtained above of its weight 3-5%, the nano silicon of 2-3%, be fully mixed to get;

(2) pre-burning: by remove outside modified oxidized iron powder raw material add water and carry out ball milling 2-3 hour one time with dispersant, then spraying is dry, carries out pre-burning, calcined temperature is 913-935 DEG C, the pre-burning time is 1-2 hour;

(3) secondary ball milling: by a ball milling material, add water and dispersant to carry out secondary ball milling 2-2.5 hour, spraying is dried, makes 230-250 order pellet;

(4) moulding: secondary ball abrasive material is mixed with modified oxidized iron powder, 11000-14000 rev/min, high speed dispersion 1-2 hour, then adds binding agent, hydraulic pressure to make base;

(5) sintering: put the moulded blank after above-mentioned moulding into sintering furnace, in the blanket of nitrogen of 0.05-0.1% oxygen volume content, be first warming up to 630-650 DEG C with 150-200 DEG C/h of speed, insulation 2-3 hour; In the blanket of nitrogen of 0.5-1% oxygen volume content, while being warming up to 700-800 DEG C with 120-150 DEG C/h of speed, insulation 0.5-0.8 hour; In the blanket of nitrogen of 3-5% oxygen volume content, then be warming up to 1300-1350 DEG C with 100-120 DEG C/h of speed, the sintered heat insulating time is 3-4 hour; After sintering in the blanket of nitrogen of 0.05-0.08% oxygen volume content with after the cooling of 50-70 DEG C/h of speed and get final product.

Beneficial effect of the present invention:

Core formulation of the present invention is reasonable, and preparation method is simple, and the magnetic core saturation induction density making is higher, loss is lower, and heatproof is higher, and the present invention is simultaneously by adding modified oxidized iron powder composition, can be used as the bridge combination between different material, use feed distribution is better, and density is high, grain boundary resistance rate is high, the porosity is low, crystal grain is large and even, there will not be crackle when sintering, dense structure, be out of shape little, rational modification composition of raw materials, in sintering process, deformation extent is small; Can machined, can line cutting, cutting, grinding etc.

Detailed description of the invention

Embodiment 1: contain Bi₂O₃The manufacture method of ferromagnetic core, comprise the following steps:

(1) for by weight, (jin) calculates the proportioning of raw material, reduced iron powder 70, brown iron oxide 15, MnO2.5, ZnO3.3, modified oxidized iron powder 5, Bi₂O₃4、SnO₂2、CaCO₃2、Al₂O₃5, CuO2, described modified oxidized iron powder is prepared by the following method:

A, trees ashes are soaked after 2-3 hour with the sodium hydroxide solution of 15-18%;

B, use 15-18% hydrochloric acid solution soak 2-3 hour;

C, with deionized water washing 3-5 time, to trees ashes be neutrality, oven dry;

D, be ground to 0.8-1.0 μ m powder, obtain modification trees ashes;

E, in brown iron oxide, add and be equivalent to the modification trees ashes obtained above of its weight 3-5%, the nano silicon of 2-3%, be fully mixed to get;

(2) pre-burning: by remove outside modified oxidized iron powder raw material add water and carry out ball milling 2-3 hour one time with dispersant, then spraying is dry, carries out pre-burning, calcined temperature is 925 DEG C, the pre-burning time is 1.5 hours;

(3) secondary ball milling: by a ball milling material, add water and dispersant to carry out secondary ball milling 2-2.5 hour, spraying is dried, makes 240 order pellets;

(4) moulding: secondary ball abrasive material is mixed with modified oxidized iron powder, and 12500 revs/min, high speed dispersion 1-2 hour, then adds binding agent, hydraulic pressure to make base;

(5) sintering: put the moulded blank after above-mentioned moulding into sintering furnace, in the blanket of nitrogen of 0.05-0.1% oxygen volume content, be first warming up to 640 DEG C with 180 DEG C/h of speed, insulation 2-3 hour; In the blanket of nitrogen of 0.5-1% oxygen volume content, while being warming up to 750 DEG C with 135 DEG C/h of speed, insulation 0.5-0.8 hour; In the blanket of nitrogen of 3-5% oxygen volume content, then be warming up to 1330 DEG C with 110 DEG C/h of speed, the sintered heat insulating time is 3-4 hour; After sintering in the blanket of nitrogen of 0.05-0.08% oxygen volume content with after the cooling of 60 DEG C/h of speed and get final product.

The saturation induction density of the magnetic core making by above-described embodiment is in 13300-14500 Gauss; The non-oriented silicon steel sheet that is 0.5 millimeter with thickness in the situation that of 400 hertz is compared, and reduces iron loss 80%, and low temperature type magnetic core can reach 570 DEG C; High temperature type magnetic core can reach 810 DEG C; In the time of 10KHz, initial permeability reaches 6500-8300; Utilize magnetic core of the present invention to use in the alternating electric field of 200-1200 hertz, compare with ferrite, volume can be contracted to 25-37%.

Claims (1)

1. contain a manufacture method for the ferromagnetic core of Bi2O3, it is characterized in that comprising the following steps:

(1) proportioning of raw material is calculating by weight, reduced iron powder 68-72, brown iron oxide 14-16, MnO2-3, ZnO2.5-4, modified oxidized iron powder 4-6, Bi₂O₃3-5、SnO₂1-3、CaCO₃1.5-2.5、Al₂O₃4-6, CuO1.5-2.5, described modified oxidized iron powder is prepared by the following method:

A, trees ashes are soaked after 2-3 hour with the sodium hydroxide solution of 15-18%;

B, use 15-18% hydrochloric acid solution soak 2-3 hour;

C, with deionized water washing 3-5 time, to trees ashes be neutrality, oven dry;

D, be ground to 0.8-1.0 μ m powder, obtain modification trees ashes;

E, in brown iron oxide, add and be equivalent to the modification trees ashes obtained above of its weight 3-5%, the nano silicon of 2-3%, be fully mixed to get;

(2) pre-burning: add water and carry out ball milling 2-3 hour a time with dispersant removing raw material outside modified oxidized iron powder, then spraying is dry, carries out pre-burning, and calcined temperature is 913-935 DEG C, and the pre-burning time is 1-2 hour; (3) secondary ball milling: by a ball milling material, add water and dispersant to carry out secondary ball milling 2-2.5 hour, spraying is dried, makes 230-250 order pellet;

(4) moulding: secondary ball abrasive material is mixed with modified oxidized iron powder, 1100-1400 rev/min, high speed dispersion 1-2 hour, then adds binding agent, hydraulic pressure to make base;

(5) sintering: put the moulded blank after above-mentioned moulding into sintering furnace, in the blanket of nitrogen of 0.05-0.1% oxygen volume content, be first warming up to 630-650 DEG C with 150-200 DEG C/h of speed, insulation 2-3 hour; In the blanket of nitrogen of 0.5-1% oxygen volume content, while being warming up to 700-800 DEG C with 120-150 DEG C/h of speed, insulation 0.5-0.8 hour; In the blanket of nitrogen of 3-5% oxygen volume content, then be warming up to 1300-1350 DEG C with 100-120 DEG C/h of speed, the sintered heat insulating time is 3-4 hour; After sintering in the blanket of nitrogen of 0.05-0.08% oxygen volume content with after the cooling of 50-70 DEG C/h of speed and get final product.