CN104319052A - Silicon-based ferrite magnetic core material for transformer - Google Patents

Abstract

The invention discloses a silicon-based ferrite magnetic core material for a transformer. The silicon-based ferrite magnetic core material comprises main ingredients and additives, wherein the main ingredients comprise 61.2-65 moles of Fe2O3, 13.4-18 moles of manganese oxide, 10.4-17 moles of zinc oxide, 1-1.8 moles of molybdenum oxide, 1.2-2 moles of aluminum hydroxide, 0.2-0.4 moles of hafnium oxide and 0.01-0.02 moles of rare earth composite magnetic-conducting powder; the additives comprise 50-60 parts per million of zinc phosphate and 60-70 parts per million of tungsten boride based on the weight ratio of each additive to the ferrite magnetic core material. The rare earth composite magnetic-conducting powder added to the ferrite magnetic core material disclosed by the invention is high in magnetic energy product and stable in magnetism, a preparation method is simple, and a finished product has the characteristics of high grain boundary resistivity, low porosity and large and uniform crystal grain sizes.

Description

A kind of silica-based ferrite core material for transformer

Technical field

The present invention relates generally to oxidate magnetic material and manufactures field, particularly relates to a kind of silica-based ferrite core material for transformer.

Background technology

Along with the communication technology and the digitized development of electronic product; new requirement is proposed to soft magnetic ferrite and element; high-performance high 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.Present telecommunications industry needs FERRITE CORE to have low core loss and high magnetic permeability, and to meet the microminiaturization of present electric equipment and high efficiency requirement, existing magnetic core is difficult to meet above-mentioned requirements;

Its magnetic energy product of the permanent magnetic material that rare earth obtains 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, and coercive force is up to 800 kilo-amperes/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, and have good mechanical performance, alloy density is low, is conducive to the lightness of magnetic element, slimming, small-sized and subminaturization.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of silica-based ferrite core material for transformer.

The present invention is achieved by the following technical solutions:

For a silica-based ferrite core material for transformer, it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the Fe of 61.2-65 mol ₂o ₃, the manganese oxide of 13.4-18 mol, the zinc oxide of 10.4-17 mol, the molybdenum oxide of 1-1.8mol, the aluminium hydroxide of 1.2-2mol, the hafnium 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 mass ratio range accounting for described ferrite core material: the trbasic zinc phosphate of 50-60ppm, boronation two tungsten of 60-70ppm;

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:

Silicon powder 100-106, HPMA 3-5, dodecyl sodium sulfate 0.6-1, polyurethanes 2-3, ammonium molybdate 1-2, deionized water 300-400;

Mixed with ammonium molybdate by silicon powder, add polyurethanes, insulated and stirred 10-15 minute at 60-80 DEG C, join in deionized water after ball milling is even, add each raw material of residue, 700-900 rev/min of dispersed with stirring 14-20 minute, obtains premixed liquid;

Be the trimethylolpropane of 1-2:5-7:100, stearic acid, neodymia mixing by mass ratio, be uniformly mixed 30-40 minute at 58-65 DEG C, add the acetic acid that concentration is 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, sinter 4-6 hour at 300-350 DEG C, obtain 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 silicon powder and the mass ratio of neodymia are 90-100:1.

For a preparation method for the silica-based ferrite core material of transformer, comprise 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, being ground to fineness is 50-70 μm, add the water of major ingredient weight 25-30%, the alum powder of 1.2-2%, 1-2% sodium alginate, high-speed stirred mixes, and obtains slurries;

(2) additive is sent into grinding pot, add the polyvinyl alcohol of weight of additive 0.5-1%, being ground to fineness is 60-100 μm;

(3) by each raw material mixing after above-mentioned process, stir, spraying dry, is pressed into base, sintering, obtains the described silica-based ferrite core material for transformer.

Advantage of the present invention is:

The rare earth compounded magnetic conductive powder magnetic energy product that ferrite 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 uniform feature greatly.

Embodiment

Embodiment 1

For a silica-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 Fe of 61.2mol ₂o ₃, the manganese oxide of 13.4 mol, the zinc oxide of 10.4 mol, the molybdenum oxide of 1.8mol, the aluminium hydroxide of 1.2mol, the hafnium oxide of 0.4 mol, the rare earth compounded magnetic conductive powder of 0.01 mol; Additive comprises according to the mass ratio range accounting for described ferrite core material: the trbasic zinc phosphate of 60ppm, boronation two tungsten of 70ppm;

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:

Silicon powder 106, HPMA 5, dodecyl sodium sulfate 0.6, polyurethanes 3, ammonium molybdate 1, deionized water 400;

Silicon powder is mixed with ammonium molybdate, ball milling evenly after add polyurethanes, at 80 DEG C, insulated and stirred 15 minutes, joins in deionized water, adds each raw material of residue, and 900 revs/min of dispersed with stirring 20 minutes, obtain premixed liquid;

Be the trimethylolpropane of 2:7:100, stearic acid, neodymia mixing by mass ratio, be uniformly mixed 40 minutes at 65 DEG C, add the acetic acid that concentration is 20%, 100 revs/min of dispersed with stirring 6 minutes, add ammonium fluoride, be uniformly mixed 30 minutes, add premixed liquid, 400 revs/min of dispersed with stirring 1 hour, drying 30 minutes at 100 DEG C, send into sintering furnace, sinter 4 hours at 350 DEG C, obtain described rare earth compounded magnetic conductive powder;

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

Described silicon powder and the mass ratio of neodymia are 100:1.

For a preparation method for the silica-based ferrite core material of transformer, comprise the following steps:

(1) above-mentioned major ingredient is sent into blending tank, 3000 revs/min are stirred mixed 4 hours, and send into grinding pot, being ground to fineness is 70 μm, add the water of major ingredient weight 30%, 1.2% alum powder, 2% sodium alginate, high-speed stirred mixes, and obtains slurries;

(2) additive is sent into grinding pot, add the polyvinyl alcohol of weight of additive 0.5%, being ground to fineness is 100 μm;

(3) by each raw material mixing after above-mentioned process, stir, spraying dry, is pressed into base, sintering, obtains the described silica-based ferrite core material for transformer.

Through detecting, 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: 408 (100 ± 2 DEG C);

Curie temperature is higher than 240 DEG C.

Claims (2)

1., for a silica-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 Fe of 61.2-65 mol ₂o ₃, the manganese oxide of 13.4-18 mol, the zinc oxide of 10.4-17 mol, the molybdenum oxide of 1-1.8mol, the aluminium hydroxide of 1.2-2mol, the hafnium 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 mass ratio range accounting for described ferrite core material: the trbasic zinc phosphate of 50-60ppm, boronation two tungsten of 60-70ppm;

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:

Silicon powder 100-106, HPMA 3-5, dodecyl sodium sulfate 0.6-1, polyurethanes 2-3, ammonium molybdate 1-2, deionized water 300-400;

Mixed with ammonium molybdate by silicon powder, add polyurethanes, insulated and stirred 10-15 minute at 60-80 DEG C, join in deionized water after ball milling is even, add each raw material of residue, 700-900 rev/min of dispersed with stirring 14-20 minute, obtains premixed liquid;

Be the trimethylolpropane of 1-2:5-7:100, stearic acid, neodymia mixing by mass ratio, be uniformly mixed 30-40 minute at 58-65 DEG C, add the acetic acid that concentration is 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, sinter 4-6 hour at 300-350 DEG C, obtain 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 silicon powder and the mass ratio of neodymia are 90-100:1.

2., as claimed in claim 1 for a preparation method for the silica-based ferrite core material of transformer, it 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, being ground to fineness is 50-70 μm, add the water of major ingredient weight 25-30%, the alum powder of 1.2-2%, 1-2% sodium alginate, high-speed stirred mixes, and obtains slurries;

(2) additive is sent into grinding pot, add the polyvinyl alcohol of weight of additive 0.5-1%, being ground to fineness is 60-100 μm;

(3) by each raw material mixing after above-mentioned process, stir, spraying dry, is pressed into base, sintering, obtains the described silica-based ferrite core material for transformer.