CN104051112A - Manganese-based ferrite core material used for transformer - Google Patents

Abstract

The invention discloses a manganese-based ferrite core material used for a transformer. The manganese-based ferrite core material comprises main materials and additives. The main materials comprise, by molar ratio, 57.1 mol to 67 mol of Fe2O3, 15.0 mol to 20 mol of manganese oxide, 10.2 mol to 15 mol of zinc oxide, 1.6 mol to 2 mol of ferrocene, 0.2 mol to 0.3 mol of cobaltous oxide and 0.01 mol to 0.02 mol of rare-earth composite magnetic powder. The additives comprise, by weight ratio of components to the ferrite core material, 60 ppm to 70 ppm of strontium, 30 ppm to 50 ppm of magnesium hydrate and 60 ppm to 100 ppm of zinc oxide. The rare-earth composite magnetic powder added into the manganese-based ferrite core material is high in magnetic energy product, stable in magnetism and simple in preparing method, and the finished product has the advantages of being high in crystal boundary resistivity, low in gas hole ratio and large and even in crystal particle.

Description

A kind of manganese based ferrite core material for transformer

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Technical field

The present invention relates generally to oxidate magnetic material and manufactures field, relates in particular to a kind of manganese based ferrite core material for transformer.

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 in order to make up the defect of prior art, and a kind of manganese based ferrite core material for transformer is provided.

The present invention is achieved by the following technical solutions:

A kind of manganese based ferrite core material for transformer, it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the rare earth compounded magnetic conductive powder of the cobalt oxide of the manganese oxide of the Fe2O3 of 57.1-67 mol, 15.0-20 mol, the zinc oxide of 10.2-15 mol, the ferrocene of 1.6-2mol, 0.2-0.3 mol, 0.01-0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the zinc oxide of the strontium of 60-70ppm, the magnesium hydroxide of 30-50ppm, 60-100ppm;

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

The preparation of premixed liquid:

Described premixed liquid is comprised of the raw material of following weight parts: manganese dioxide 80-90, Arabic gum 3-4,1-Methoxy-2-propyl acetate 2-3, tricalcium silicate 1-2, succinate sodium 2-ethylhexyl 1-2, deionized water 200-300;

By manganese dioxide and tricalcium silicate mixing and ball milling to fineness, be 50-100 μ m, add 1-Methoxy-2-propyl acetate, be uniformly mixed 20-35 minute;

Succinate sodium 2-ethylhexyl is joined in deionized water, after stirring, add Arabic gum, insulated and stirred 3-5 minute at 60-80 ℃;

Each raw material after above-mentioned processing is mixed, and 700-1000 rev/min of dispersed with stirring 10-20 minute, obtains premixed liquid;

The trimethylolpropane that is 1-2:5-7:100 by mass ratio, stearic acid, neodymia mix, at 58-65 ℃, 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 ℃, send into sintering furnace, sintering 4-6 hour at 300-350 ℃, 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 manganese dioxide and the mass ratio of neodymia are 70-80:1.

A preparation method for the manganese based ferrite core material of transformer, 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 ammonium persulfate of 1-2%, and high-speed stirred is mixed, and obtains slurries;

(2) additive is sent into grinding pot, add the polyoxyethylene oleic acid ester of weight of additive 0.5-1%, being ground to fineness is 60-100 μ m;

(3) each raw material after above-mentioned processing is mixed, stir, spraying is dry, is pressed into base, and sintering obtains the described manganese based ferrite core material for transformer.

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 manganese based ferrite core material for transformer, it is characterized in that it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the rare earth compounded magnetic conductive powder of the cobalt oxide of the Fe2O3 of 57.1 mol, the manganese oxide of 15.0mol, the zinc oxide of 10.2mol, the ferrocene of 1.6mol, 0.3 mol, 0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the zinc oxide of the strontium of 70ppm, the magnesium hydroxide of 50ppm, 100ppm;

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

The preparation of premixed liquid:

Described premixed liquid is comprised of the raw material of following weight parts: manganese dioxide 90, Arabic gum 4,1-Methoxy-2-propyl acetate 2, tricalcium silicate 1, succinate sodium 2-ethylhexyl 1, deionized water 300;

By manganese dioxide and tricalcium silicate mixing and ball milling to fineness, be 100 μ m, add 1-Methoxy-2-propyl acetate, be uniformly mixed 35 minutes;

Succinate sodium 2-ethylhexyl is joined in deionized water, after stirring, add Arabic gum, at 80 ℃, insulated and stirred is 3 minutes;

Each raw material after above-mentioned processing is mixed, and 1000 revs/min of dispersed with stirring 20 minutes, obtain premixed liquid;

The trimethylolpropane that is 1:5:100 by mass ratio, stearic acid, neodymia mix, at 65 ℃, 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 30 minutes, add premixed liquid, 500 revs/min of dispersed with stirring 1 hour, at 100 ℃, be dried 30 minutes, send into sintering furnace, sintering is 4 hours at 350 ℃, obtains described rare earth compounded magnetic conductive powder;

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

Described manganese dioxide and the mass ratio of neodymia are 80:1.

A preparation method for the manganese based ferrite core material of transformer, 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 70 μ m, adds the water of major ingredient weight 30%, 2% ammonium persulfate, and high-speed stirred is mixed, and obtains slurries;

(2) additive is sent into grinding pot, add the polyoxyethylene oleic acid ester of weight of additive 0.5%, being ground to fineness is 100 μ m;

(3) each raw material after above-mentioned processing is mixed, stir, spraying is dry, is pressed into base, and sintering obtains the described manganese based ferrite core material for transformer.

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: 404 (100 ± 2 ℃);

Curie temperature is higher than 240 ℃.

Claims (2)

1. the manganese based ferrite core material for transformer, it is characterized in that it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the rare earth compounded magnetic conductive powder of the cobalt oxide of the manganese oxide of the Fe2O3 of 57.1-67 mol, 15.0-20 mol, the zinc oxide of 10.2-15 mol, the ferrocene of 1.6-2mol, 0.2-0.3 mol, 0.01-0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the zinc oxide of the strontium of 60-70ppm, the magnesium hydroxide of 30-50ppm, 60-100ppm;

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

The preparation of premixed liquid:

Described premixed liquid is comprised of the raw material of following weight parts: manganese dioxide 80-90, Arabic gum 3-4,1-Methoxy-2-propyl acetate 2-3, tricalcium silicate 1-2, succinate sodium 2-ethylhexyl 1-2, deionized water 200-300;

By manganese dioxide and tricalcium silicate mixing and ball milling to fineness, be 50-100 μ m, add 1-Methoxy-2-propyl acetate, be uniformly mixed 20-35 minute;

Succinate sodium 2-ethylhexyl is joined in deionized water, after stirring, add Arabic gum, insulated and stirred 3-5 minute at 60-80 ℃;

Each raw material after above-mentioned processing is mixed, and 700-1000 rev/min of dispersed with stirring 10-20 minute, obtains premixed liquid;

The trimethylolpropane that is 1-2:5-7:100 by mass ratio, stearic acid, neodymia mix, at 58-65 ℃, 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 ℃, send into sintering furnace, sintering 4-6 hour at 300-350 ℃, 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 manganese dioxide and the mass ratio of neodymia are 70-80:1.

2. a preparation method for the manganese based ferrite core material for transformer 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 ammonium persulfate of 1-2%, and high-speed stirred is mixed, and obtains slurries;

(2) additive is sent into grinding pot, add the polyoxyethylene oleic acid ester of weight of additive 0.5-1%, being ground to fineness is 60-100 μ m;

(3) each raw material after above-mentioned processing is mixed, stir, spraying is dry, is pressed into base, and sintering obtains the described manganese based ferrite core material for transformer.