CN104091674A - Rare earth ferromagnetic core material - Google Patents

Abstract

The invention discloses a rare earth ferromagnetic core material which comprises a main material and an additive, wherein the main material comprises the following components according to the molar ratio: 60-70.5 mol of Fe3O4, 20-30.5 mol of Fe2O3, 12.5-20 mol of manganese oxide, 6.3-10 mol of zinc oxide and 2.3-24 mol of chromium, 0.1-0.2 mol of zinc and 0.01-0.03 mol of cyanuric acid zinc; the additive comprises the following components according to the weight ratio occupied in the ferromagnetic core material: 10-20 ppm of calcium chloride, 30-40 ppm of aluminum oxide, 20-40 ppm of titanium tetrachloride and 800-1000 ppm of rare earth composite magnetic conductive powder. The rare earth ferromagnetic core material has the advantages that the rare earth composite magnetic conductive powder added into the ferromagnetic core material has high magnetic energy product and stable magnetism, the mechanical property of the ferromagnetic core material can be obviously improved, and the porosity can be reduced.

Description

A kind of Rare-earth Iron core material

Technical field

The present invention relates generally to oxidate magnetic material and manufactures field, relates in particular to a kind of Rare-earth Iron core material.

Background technology

Along with the communication technology and the digitized development of electronic product; soft magnetic ferrite and element have been proposed to new requirement; high-performance high magnetic permeability magnetic core is widely used in each type telecommunications and information stock, as the fields such as common-mode filter, pulsactor, current transformer, earth leakage protective device, insulating transformer, signal and pulse transformer are widely applied.Telecommunications industry needs FERRITE CORE to have low core loss and high magnetic permeability now, and to meet microminiaturization and the high efficiency requirement of present electric equipment, existing magnetic core is difficult to meet above-mentioned requirements;

Its magnetic energy product of the permanent magnetic material that rare earth makes can reach 150 times of carbon steel, 3～5 times of aluminium zinc zinc permanent magnetic material, 8～10 times of permanent-magnet ferrite, and temperature coefficient is low, magnetic stability, coercive force is up to 800 kilo-ampere/rice.Be mainly used in the magnetic system of low speed torque motor, actuating motor, transducer, magnetic bearing etc.Nd-Fe-Bo permanent magnet material is third generation rare earth permanent-magnetic material, and its remanent magnetism, coercive force and maximum magnetic energy product are higher than the former, non-friable, has good mechanical performance, and alloy density is low, is conducive to lightness, slimming, the small-sized and subminaturization of magnetic element.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, and a kind of Rare-earth Iron core material is provided.

The present invention is achieved by the following technical solutions:

A kind of Rare-earth Iron core material, it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the zinc of the manganese oxide of mol Fe2O3, the 12.5-20mol of Fe3O4, the 20-30.5 of 60-70.5 mol, the zinc oxide of 6.3-10mol, 0.1-0.2 mol, 0.01-0.03mol cyanuric acid zinc; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the rare earth compounded magnetic conductive powder of the calcium chloride of 10-20ppm, the aluminium oxide of 30-40ppm, 20-40ppm titanium tetrachloride, 800-1000ppm;

The preparation of described rare earth compounded magnetic conductive powder comprises the following steps:

(1) preparation of ferrous solution:

Ferric trichloride is joined in 5-10 times of water, after fully dissolving, add polyacrylamide, shitosan, 100-200 rev/min of dispersed with stirring 10-14 minute, obtains ferrous solution;

(2) polyvinylpyrrolidone is joined in lanthanum chloride solution, at 60-80 DEG C, be uniformly mixed 10-20 minute, add ammonium bicarbonate aqueous solution, insulation 3-5h, adds above-mentioned ferrous solution, is stirred to normal temperature, centrifugal dehydration, 200 DEG C of dry 30-40 minute of 100-, calcine 6-10 hour at 300-500 DEG C, obtain described rare earth compounded magnetic conductive powder.

The concentration of described lanthanum chloride solution is 0.8-2mol/L; The concentration of ammonium bicarbonate aqueous solution is that 20-30%, consumption are the 30-40% of lanthanum chloride solution weight;

Described polyvinylpyrrolidone and the mol ratio of lanthanum chloride are 1-2:1;

Described ferric trichloride and the mass ratio of lanthanum chloride are 50-100:2-3;

The mass ratio of described ferric trichloride and polyacrylamide, shitosan is 60-70:1-2:1.

A preparation method for Rare-earth Iron core material, comprises the following steps:

(1) above-mentioned major ingredient is sent into blending tank, 2500-3000 rev/min is stirred mixed 2-4 hour, sends into rotary furnace pre-burning, control 400 DEG C of temperature 300-, the pre-burning time is 2-4 hour, sends into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, being ground to fineness is 40-100 μ m;

(2) additive is sent into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, be wherein added with and be equivalent to weight of additive 0.8 locust bean gum, being ground to fineness is 40-50 μ m;

(3) above-mentioned each raw material after treatment is mixed, spraying is dry, is pressed into base, and sintering, obtains described Rare-earth Iron core material.

Advantage of the present invention is:

Rare earth compounded magnetic conductive powder good weatherability, magnetic energy product that ferromagnetic core material of the present invention adds are high, and magnetic stability can obviously improve the mechanical performance of ferromagnetic core material, reduces the porosity.

Embodiment

Embodiment 1

A kind of Rare-earth Iron core material, it is characterized in that it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the manganese oxide of the Fe3O4 of 70.5 mol, 20 mol Fe2O3,20mol, the zinc oxide of 10mol, the zinc of 0.2 mol, 0.03mol cyanuric acid zinc; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the rare earth compounded magnetic conductive powder of the calcium chloride of 20ppm, the aluminium oxide of 40ppm, 40ppm titanium tetrachloride, 1000ppm;

The preparation of described rare earth compounded magnetic conductive powder comprises the following steps:

(1) preparation of ferrous solution:

Ferric trichloride is joined in 10 times of water, after fully dissolving, add polyacrylamide, shitosan, 100-200 rev/min of dispersed with stirring 14 minutes, obtains ferrous solution;

(2) polyvinylpyrrolidone is joined in lanthanum chloride solution, at 80 DEG C, be uniformly mixed 20 minutes, add ammonium bicarbonate aqueous solution, insulation 5h, adds above-mentioned ferrous solution, is stirred to normal temperature, centrifugal dehydration, 200 DEG C dry 40 minutes, calcine 10 hours at 500 DEG C, obtain described rare earth compounded magnetic conductive powder.

The concentration of described lanthanum chloride solution is 0.8mol/L; The concentration of ammonium bicarbonate aqueous solution is 30%, consumption is 30% of lanthanum chloride solution weight;

Described polyvinylpyrrolidone and the mol ratio of lanthanum chloride are 2:1;

Described ferric trichloride and the mass ratio of lanthanum chloride are 100:3;

The mass ratio of described ferric trichloride and polyacrylamide, shitosan is 70:2:1.

A preparation method for Rare-earth Iron core material, comprises the following steps:

(1) above-mentioned major ingredient is sent into blending tank, 3000 revs/min are stirred mixed 2 hours, send into rotary furnace pre-burning, control 400 DEG C of temperature, and the pre-burning time is 4 hours, sends into grinding pot, adopts the alcohol water blend that abrasive media is 20%, and being ground to fineness is 100 μ m;

(2) additive is sent into grinding pot, adopt the alcohol water blend that abrasive media is 20%, be wherein added with and be equivalent to weight of additive 0.7% locust bean gum, being ground to fineness is 50 μ m;

(3) above-mentioned each raw material after treatment is mixed, spraying is dry, is pressed into base, and sintering, obtains described Rare-earth Iron core material.

Through detection, the basic mechanical design feature index that the product of above-described embodiment 1 gained reaches:

The saturation induction density of magnetic core of the present invention can reach 15000 Gausses, and saturation flux rate density is 474mT, and Curie temperature is higher than 240 DEG C, resistivity 6.3 Ω .m.

Claims (2)

1. a Rare-earth Iron core material, it is characterized in that it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the zinc of the manganese oxide of mol Fe2O3, the 12.5-20mol of Fe3O4, the 20-30.5 of 60-70.5 mol, the zinc oxide of 6.3-10mol, 0.1-0.2 mol, 0.01-0.03mol cyanuric acid zinc; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the rare earth compounded magnetic conductive powder of the calcium chloride of 10-20ppm, the aluminium oxide of 30-40ppm, 20-40ppm titanium tetrachloride, 800-1000ppm;

The preparation of described rare earth compounded magnetic conductive powder comprises the following steps:

(1) preparation of ferrous solution:

Ferric trichloride is joined in 5-10 times of water, after fully dissolving, add polyacrylamide, shitosan, 100-200 rev/min of dispersed with stirring 10-14 minute, obtains ferrous solution;

(2) polyvinylpyrrolidone is joined in lanthanum chloride solution, at 60-80 DEG C, be uniformly mixed 10-20 minute, add ammonium bicarbonate aqueous solution, insulation 3-5h, adds above-mentioned ferrous solution, is stirred to normal temperature, centrifugal dehydration, 200 DEG C of dry 30-40 minute of 100-, calcine 6-10 hour at 300-500 DEG C, obtain described rare earth compounded magnetic conductive powder;

The concentration of described lanthanum chloride solution is 0.8-2mol/L; The concentration of ammonium bicarbonate aqueous solution is that 20-30%, consumption are the 30-40% of lanthanum chloride solution weight;

Described polyvinylpyrrolidone and the mol ratio of lanthanum chloride are 1-2:1;

Described ferric trichloride and the mass ratio of lanthanum chloride are 50-100:2-3;

The mass ratio of described ferric trichloride and polyacrylamide, shitosan is 60-70:1-2:1.

2. a preparation method for Rare-earth Iron core material as claimed in claim 1, is characterized in that comprising the following steps:

(1) above-mentioned major ingredient is sent into blending tank, 2500-3000 rev/min is stirred mixed 2-4 hour, sends into rotary furnace pre-burning, control 400 DEG C of temperature 300-, the pre-burning time is 2-4 hour, sends into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, being ground to fineness is 60-100 μ m;

(2) additive is sent into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, be wherein added with the locust bean gum that is equivalent to weight of additive 0.7-1%, being ground to fineness is 40-50 μ m;

(3) above-mentioned each raw material after treatment is mixed, spraying is dry, is pressed into base, and sintering, obtains described Rare-earth Iron core material.