CN104091669A - Zinc oxide-based rare earth ferromagnetic core material - Google Patents

Abstract

The invention discloses a zinc oxide-based rare earth ferromagnetic core material which comprises main materials and additives, wherein the main materials comprise the following components in molar ratio: 68-75.5 mol of Fe3O4, 14-25.5 mol of manganese oxide, 6.5-10 mol of zinc oxide, 0.01-0.02 mol of boron trifluoride and 0.01-0.03 mol of tungsten boride; the additives comprise the following components: 40-60 ppm of sodium molybdate, 10-20 ppm of beryllium oxide, 10-20 ppm of zinc naphthenate and 800-1,000 ppm of zinc oxide-based rare earth composite magnetic powder, counted by the weight percentage accounting for the weight percentage of the ferromagnetic core material. The rare earth composite magnetic powder is added in the ferromagnetic core material disclosed by the invention is high in magnetic energy product and stable in magnetism; by using the rare earth composite magnetic powder, mechanical properties of the ferromagnetic core material can be remarkably improved and the porosity is reduced.

Description

A kind of Zinc oxide-base 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 Zinc oxide-base 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 Zinc oxide-base Rare-earth Iron core material is provided.

The present invention is achieved by the following technical solutions:

A kind of Zinc oxide-base Rare-earth Iron core material, it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the zinc oxide of the Fe3O4 of 68-75.5 mol, the manganese oxide of 14-25.5mol, 6.5-10 mol, the boron trifluoride of 0.01-0.02 mol, 0.01-0.03mol boronation two tungsten; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the zinc naphthenate of the sodium molybdate of 40-60ppm, the beryllium oxide of 10-20ppm, 10-20ppm, the zinc oxide rare earth compounded magnetic conductive powder of 800-1000ppm;

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

(1) preparation of zinc oxide colloidal sol:

Propolis, tertiary carbonic acid glycidyl ester are mixed, at 30-40 DEG C, be uniformly mixed 2-4 minute, add oleic acid, diethylenetriamines, water, 100-200 rev/min of dispersed with stirring 5-10 minute, it is to add after 40-60 μ m that zinc oxide is ground to fineness, 300-500 rev/min of dispersed with stirring 10-13 minute;

(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 zinc oxide colloidal sol, is stirred to normal temperature, centrifugal dehydration, 200 DEG C of dry 30-40 minute of 100-, calcine 6-10 hour at 600-800 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 zinc oxide and the mass ratio of lanthanum chloride are 60-70:1;

The mass ratio of described propolis, tertiary carbonic acid glycidyl ester, zinc oxide, oleic acid, diethylenetriamines, water is 4-6:2-3:100:2-3:1-2:400-500.

A preparation method for Zinc oxide-base 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 the HEDP of weight of additive 0.7-1%, the shitosan of 1-2%, 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 Zinc oxide-base Rare-earth Iron core material.

Advantage of the present invention is:

Zinc oxide 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 Zinc oxide-base 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 oxide of the Fe3O4 of 75.5 mol, the manganese oxide of 25.5mol, 6.5 mol, the boron trifluoride of 0.02 mol, 0.03mol boronation two tungsten; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the zinc naphthenate of the sodium molybdate of 60ppm, the beryllium oxide of 20ppm, 20ppm, the zinc oxide rare earth compounded magnetic conductive powder of 1000ppm;

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

(1) preparation of zinc oxide colloidal sol:

Propolis, tertiary carbonic acid glycidyl ester are mixed, at 40 DEG C, be uniformly mixed 4 minutes, add oleic acid, diethylenetriamines, water, 200 revs/min of dispersed with stirring 10 minutes, it is to add after 60 μ m that zinc oxide is ground to fineness, 500 revs/min of dispersed with stirring 13 minutes;

(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 zinc oxide colloidal sol, is stirred to normal temperature, centrifugal dehydration, 200 DEG C dry 40 minutes, calcine 10 hours at 700 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 40% of lanthanum chloride solution weight;

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

Described zinc oxide and the mass ratio of lanthanum chloride are 70:1;

The mass ratio of described propolis, tertiary carbonic acid glycidyl ester, zinc oxide, oleic acid, diethylenetriamines, water is 4:2:100:2:1:400.

A preparation method for Zinc oxide-base 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 the HEDP of weight of additive 0.7%, 1% shitosan, 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 Zinc oxide-base 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 468mT, and Curie temperature is higher than 240 DEG C, resistivity 6.4 Ω .m.

Claims (2)

1. a Zinc oxide-base 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 oxide of the Fe3O4 of 68-75.5 mol, the manganese oxide of 14-25.5mol, 6.5-10 mol, the boron trifluoride of 0.01-0.02 mol, 0.01-0.03mol boronation two tungsten; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the zinc naphthenate of the sodium molybdate of 40-60ppm, the beryllium oxide of 10-20ppm, 10-20ppm, the zinc oxide rare earth compounded magnetic conductive powder of 800-1000ppm;

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

(1) preparation of zinc oxide colloidal sol:

Propolis, tertiary carbonic acid glycidyl ester are mixed, at 30-40 DEG C, be uniformly mixed 2-4 minute, add oleic acid, diethylenetriamines, water, 100-200 rev/min of dispersed with stirring 5-10 minute, it is to add after 40-60 μ m that zinc oxide is ground to fineness, 300-500 rev/min of dispersed with stirring 10-13 minute;

(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 zinc oxide colloidal sol, is stirred to normal temperature, centrifugal dehydration, 200 DEG C of dry 30-40 minute of 100-, calcine 6-10 hour at 600-800 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 zinc oxide and the mass ratio of lanthanum chloride are 60-70:1;

The mass ratio of described propolis, tertiary carbonic acid glycidyl ester, zinc oxide, oleic acid, diethylenetriamines, water is 4-6:2-3:100:2-3:1-2:400-500.

2. a preparation method for Zinc oxide-base 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 and be equivalent to the HEDP of weight of additive 0.7-1%, the shitosan of 1-2%, 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 Zinc oxide-base Rare-earth Iron core material.