CN104078186A - Zinc-base ferrite core material - Google Patents

Abstract

The invention discloses a zinc-base ferrite core material. The zinc-base ferrite core material comprises a main material and an additive, wherein the main material comprises the following ingredients in parts by mole: 60.3-67 mol of Fe2O3 (Ferric Oxide), 15.8-23mol of manganese oxide, 10-14.3 mol of zinc oxide, 2-2.5mol of magnesium oxide, 1.3-2mol of ferric oxide, 0.2-0.4mol of chromic oxide, and 0.01-0.02mol of rare earth composite magnetic powder; according to the weight ratio of the zinc-base ferrite core material, the additive comprises: 80-100ppm of neodymium oxide, 80-90ppm of calcium chloride, and 100-160ppm of aluminum oxide. The rare earth composite magnetic powder added into the zinc-base ferrite core material provided by the invention is high in magnetic energy product, stable in magnetism and simple in preparation method; furthermore, a finished product has the characteristics of high grain boundary resistivity, low gas hole ratio and large and uniform grains.

Description

A kind of Zn base ferrite core material

Technical field

The present invention relates generally to oxidate magnetic material and manufactures field, relates in particular to a kind of Zn base ferrite 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 Al-Ni-Co permanent magnet 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 Zn base ferrite core material is provided.

The present invention is achieved by the following technical solutions:

A kind of Zn base ferrite core material, it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the iron oxide of the zinc oxide of the Fe2O3 of 60.3-67 mol, the manganese oxide of 15.8-23 mol, 10-14.3 mol, the magnesium oxide of 2-2.5mol, 1.3-2mol, the chromium oxide of 0.2-0.4 mol, the rare earth compounded magnetic conductive powder of 0.01-0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the aluminium oxide of the neodymia of 80-100ppm, the calcium chloride of 80-90ppm, 100-160ppm;

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

The preparation of premixed liquid:

Described premixed liquid is made up of the raw material of following weight parts:

Zinc oxide 93-100, pentaerythrite 2-3, polyoxyethylene polyoxy propyl alcohol amidogen ether 0.4-1, hydroxyethylcellulose 1-2, dimethyl glutarate 1-2, deionized water 200-300;

Pentaerythrite is mixed with zinc oxide, and at 60-70 DEG C, ball milling mixing 3-5 minute, adds dimethyl glutarate, after stirring, joins in deionized water, adds the each raw material of residue, and 400-600 rev/min of dispersed with stirring 20-30 minute, obtains premixed liquid;

The trimethylolpropane that is 1-2:5-7:100 by mass ratio, stearic acid, neodymia mix, at 58-65 DEG C, be uniformly mixed 30-40 minute, adding concentration is the acetic acid of 10-20%, 70-100 rev/min of dispersed with stirring 4-6 minute, add ammonium fluoride, be uniformly mixed 20-30 minute, add premixed liquid, 400-500 rev/min of dispersed with stirring 1-2 hour, dry 20-30 minute at 80-100 DEG C, send into sintering furnace, sintering 4-6 hour at 300-350 DEG C, obtains described rare earth compounded magnetic conductive powder;

The mol ratio of described neodymia, acetic acid, ammonium fluoride is 2-3:6-7:1-2;

Described zinc oxide and the mass ratio of neodymia are 90-100:1.

A preparation method for Zn base ferrite 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 grinding pot, and being ground to fineness is 50-70 μ m, adds the water of major ingredient weight 25-30%, the graphite of 1.8-2%, and high-speed stirred is mixed, and obtains slurries;

(2) additive is sent into grinding pot, add the zinc naphthenate of weight of additive 0.8-1%, being ground to fineness is 60-100 μ m;

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

Advantage of the present invention is:

The rare earth compounded magnetic conductive powder magnetic energy product that ferrite magnetic core material of the present invention adds is high, magnetic stability, and preparation method is simple, and it is high that finished product has grain boundary resistance rate, and the porosity is low, mechanical performance is strong, and crystal grain is feature greatly and uniformly.

Embodiment

Embodiment 1

A kind of Zn base ferrite core material, it is characterized in that it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the iron oxide of the zinc oxide of the Fe2O3 of 60.3-67 mol, the manganese oxide of 15.8-23 mol, 10-14.3 mol, the magnesium oxide of 2-2.5mol, 1.3-2mol, the chromium oxide of 0.2-0.4 mol, the rare earth compounded magnetic conductive powder of 0.01-0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the aluminium oxide of the neodymia of 80-100ppm, the calcium chloride of 80-90ppm, 100-160ppm;

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

The preparation of premixed liquid:

Described premixed liquid is made up of the raw material of following weight parts:

Zinc oxide 100, pentaerythrite 3, polyoxyethylene polyoxy propyl alcohol amidogen ether 0.4, hydroxyethylcellulose 2, dimethyl glutarate 1, deionized water 300;

Pentaerythrite is mixed with zinc oxide, and at 70 DEG C, ball milling mixes 5 minutes, adds dimethyl glutarate, after stirring, joins in deionized water, adds the each raw material of residue, and 600 revs/min of dispersed with stirring 20 minutes, obtain premixed liquid;

The trimethylolpropane that is 2:7:100 by mass ratio, stearic acid, neodymia mix, at 65 DEG C, be uniformly mixed 40 minutes, adding concentration is 20% acetic acid, 100 revs/min of dispersed with stirring 4 minutes, add ammonium fluoride, be uniformly mixed 20 minutes, add premixed liquid, 500 revs/min of dispersed with stirring 2 hours, at 100 DEG C, be dried 30 minutes, send into sintering furnace, sintering 6 hours, obtains described rare earth compounded magnetic conductive powder at 350 DEG C;

The mol ratio of described neodymia, acetic acid, ammonium fluoride is 3:7:2;

Described zinc oxide and the mass ratio of neodymia are 100:1.

A preparation method for Zn base ferrite core material, comprises the following steps:

(1) above-mentioned major ingredient is sent into blending tank, 3000 revs/min are stirred mixed 4 hours, send into grinding pot, and being ground to fineness is 50 μ m, adds the water of major ingredient weight 30%, 1.8% graphite, and high-speed stirred is mixed, and obtains slurries;

(2) additive is sent into grinding pot, add the zinc naphthenate of weight of additive 0.8%, being ground to fineness is 100 μ m;

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

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

The initial permeability of magnetic core of the present invention is greater than 2700 μ i;

Maximum magnetic flux core loss (100Kc, 200mT) unit: KW/m ³: 439 (100 ± 2 DEG C);

Curie temperature is higher than 240 DEG C.

Claims (2)

1. a Zn base ferrite core material, it is characterized in that it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the iron oxide of the zinc oxide of the Fe2O3 of 60.3-67 mol, the manganese oxide of 15.8-23 mol, 10-14.3 mol, the magnesium oxide of 2-2.5mol, 1.3-2mol, the chromium oxide of 0.2-0.4 mol, the rare earth compounded magnetic conductive powder of 0.01-0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the aluminium oxide of the neodymia of 80-100ppm, the calcium chloride of 80-90ppm, 100-160ppm;

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

The preparation of premixed liquid:

Described premixed liquid is made up of the raw material of following weight parts:

Zinc oxide 93-100, pentaerythrite 2-3, polyoxyethylene polyoxy propyl alcohol amidogen ether 0.4-1, hydroxyethylcellulose 1-2, dimethyl glutarate 1-2, deionized water 200-300;

Pentaerythrite is mixed with zinc oxide, and at 60-70 DEG C, ball milling mixing 3-5 minute, adds dimethyl glutarate, after stirring, joins in deionized water, adds the each raw material of residue, and 400-600 rev/min of dispersed with stirring 20-30 minute, obtains premixed liquid;

The trimethylolpropane that is 1-2:5-7:100 by mass ratio, stearic acid, neodymia mix, at 58-65 DEG C, be uniformly mixed 30-40 minute, adding concentration is the acetic acid of 10-20%, 70-100 rev/min of dispersed with stirring 4-6 minute, add ammonium fluoride, be uniformly mixed 20-30 minute, add premixed liquid, 400-500 rev/min of dispersed with stirring 1-2 hour, dry 20-30 minute at 80-100 DEG C, send into sintering furnace, sintering 4-6 hour at 300-350 DEG C, obtains described rare earth compounded magnetic conductive powder;

The mol ratio of described neodymia, acetic acid, ammonium fluoride is 2-3:6-7:1-2;

Described zinc oxide and the mass ratio of neodymia are 90-100:1.

2. a preparation method for Zn base ferrite 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 grinding pot, and being ground to fineness is 50-70 μ m, adds the water of major ingredient weight 25-30%, the graphite of 1.8-2%, and high-speed stirred is mixed, and obtains slurries;

(2) additive is sent into grinding pot, add the zinc naphthenate of weight of additive 0.8-1%, being ground to fineness is 60-100 μ m;

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