CN104091670A - Ferric oxide-based rare earth ferromagnetic core material - Google Patents

Abstract

The invention discloses a ferric oxide-based rare earth ferromagnetic core material which comprises main materials and additives, wherein the main materials comprise the following components in molar ratio: 70-76 mol of Fe3O4, 15-20 mol of manganese oxide, 8-12.5 mol of zinc oxide, 0.4-0.6 mol of cobalt and 0.01-0.1 mol of neodymiumm oxide; the additives comprise the following components: 20-30 ppm of magnesium chloride, 40-50 ppm of diamond powder and 700-1,000 ppm of ferric 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 iron oxide based 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 iron oxide based 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 aluminum oxidation iron iron oxide 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 iron oxide based Rare-earth Iron core material is provided.

The present invention is achieved by the following technical solutions:

A kind of iron oxide based 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 70-76 mol, the manganese oxide of 15-20 mol, 8-12.5mol, the cobalt of 0.4-0.6 mol, 0.01-0.1mol neodymia; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the iron oxide based rare earth compounded magnetic conductive powder of the magnesium chloride of 20-30ppm, the bortz powder of 40-50ppm, 700-1000ppm;

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

(1) preparation of iron oxide colloidal sol:

Emulsifier EL-60, stearic acid, iron oxide are mixed, at 70-80 DEG C, be uniformly mixed 10-12 minute;

Dodecyl dimethyl benzyl amine-oxides is joined in 60-80 times of water, add brown sugar, at 60-70 DEG C, be uniformly mixed 4-6 minute;

Above-mentioned each raw material after treatment is mixed to 600-1000 rev/min of dispersed with stirring 30-35 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 iron 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 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 iron oxide and the mass ratio of lanthanum chloride are 40-60:1;

The fineness of described iron oxide is 30-40 μ m;

The mass ratio of described Emulsifier EL-60, stearic acid, iron oxide, dodecyl dimethyl benzyl amine-oxides, brown sugar is 2-3:3-4:70-90:4-6:6-10.

A preparation method for iron oxide based 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 glucose of weight of additive 0.1-0.2%, the calcium propionate 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 iron oxide based Rare-earth Iron core material.

Advantage of the present invention is:

Iron oxide based 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 iron oxide based Rare-earth Iron core material, is characterized in that it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the zinc oxide of the Fe3O4 of 76 mol, the manganese oxide of 20 mol, 12.5mol, the cobalt of 0.4mol, 0.01mol neodymia; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the iron oxide based rare earth compounded magnetic conductive powder of the magnesium chloride of 20-30ppm, the bortz powder of 50ppm, 1000ppm;

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

(1) preparation of iron oxide colloidal sol:

Emulsifier EL-60, stearic acid, iron oxide are mixed, at 80 DEG C, be uniformly mixed 12 minutes;

Dodecyl dimethyl benzyl amine-oxides is joined in 80 times of water, add brown sugar, at 70 DEG C, be uniformly mixed 4 minutes;

Above-mentioned each raw material after treatment is mixed to 1000 revs/min of dispersed with stirring 35 minutes;

(2) polyvinylpyrrolidone is joined in lanthanum chloride solution, at 60 DEG C, be uniformly mixed 20 minutes, add ammonium bicarbonate aqueous solution, insulation 5h, adds above-mentioned iron oxide colloidal sol, is stirred to normal temperature, centrifugal dehydration, 200 DEG C dry 40 minutes, calcine 10 hours at 300 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 iron oxide and the mass ratio of lanthanum chloride are 60:1;

The fineness of described iron oxide is 40 μ m;

The mass ratio of described Emulsifier EL-60, stearic acid, iron oxide, dodecyl dimethyl benzyl amine-oxides, brown sugar is 3:3:70:6:6.

A preparation method for iron oxide based 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 glucose of weight of additive 0.1%, 1% calcium propionate, 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 iron oxide based 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 482mT, and Curie temperature is higher than 240 DEG C, resistivity 6.6 Ω .m.

Claims (2)

1. an iron oxide based 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 70-76 mol, the manganese oxide of 15-20 mol, 8-12.5mol, the cobalt of 0.4-0.6 mol, 0.01-0.1mol neodymia; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the iron oxide based rare earth compounded magnetic conductive powder of the magnesium chloride of 20-30ppm, the bortz powder of 40-50ppm, 700-1000ppm;

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

(1) preparation of iron oxide colloidal sol:

Emulsifier EL-60, stearic acid, iron oxide are mixed, at 70-80 DEG C, be uniformly mixed 10-12 minute;

Dodecyl dimethyl benzyl amine-oxides is joined in 60-80 times of water, add brown sugar, at 60-70 DEG C, be uniformly mixed 4-6 minute;

Above-mentioned each raw material after treatment is mixed to 600-1000 rev/min of dispersed with stirring 30-35 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 iron 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 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 iron oxide and the mass ratio of lanthanum chloride are 40-60:1;

The fineness of described iron oxide is 30-40 μ m;

The mass ratio of described Emulsifier EL-60, stearic acid, iron oxide, dodecyl dimethyl benzyl amine-oxides, brown sugar is 2-3:3-4:70-90:4-6:6-10.

2. a preparation method for iron oxide based 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 glucose of weight of additive 0.1-0.2%, the calcium propionate 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 iron oxide based Rare-earth Iron core material.