CN104387047A - Clay-based ferrite magnetic core material for transformers - Google Patents

Abstract

The invention discloses a clay-based ferrite magnetic core material for transformers. The clay-based ferrite magnetic core material comprises main materials and additives, and the main materials comprise 60-65.3mol of Fe2O3, 15.7-25mol of manganese oxide, 13.0-15mol of zinc oxide, 2-3.1mol of silica, 0.1-0.2mol of calcium chloride, 0.01-0.02mol of neodymium oxide and 0.01-0.02mol of rare earth compounded magnetic conductive powder; and the additives comprise 30-40ppm of cobalt oxide, 40-50ppm of strontium and 60-100ppm of barium oxide. The rare earth compounded magnetic conductive powder added in the clay-based ferrite magnetic core material has a high magnetic energy product and stable magnetism, and the clay-based ferrite magnetic core material has the characteristics of simple preparation method, high crystal boundary resistivity, low porosity, and large and uniform crystal grains.

Description

A kind of clay-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 clay-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 basic material, as the fields such as common-mode filter, saturation inductance, 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 electrical equipment and high efficiency requirement, existing magnetic core is difficult to meet above-mentioned requirements;

Its magnetic energy product of the permanent magnet 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 factor 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 electric motor, actuating motor, sensor, 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 property, alloy density is low, is conducive to the lightness of magnetics, slimming, small-sized and subminiaturization.

Summary of the invention

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

The present invention is achieved by the following technical solutions:

For a clay-based ferrite core material for transformer, it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the Fe of 60-65.3 mol ₂o ₃, the manganese oxide of 15.7-25 mol, the zinc oxide of 13.0-15 mol, the silicon-dioxide of 2-3.1mol, the calcium chloride of 0.1-0.2mol, the Neodymium trioxide of 0.01-0.02 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 barium oxide of the cobalt oxide of 30-40ppm, the strontium of 40-50ppm, 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 made up of the raw material of following weight parts:

Clay 65-70, aluminum stearate 2-3, Sodium Silicofluoride 1-2, aminopropyl triethoxysilane 0.6-1, N hydroxymethyl acrylamide 1-2, deionized water 180-220;

Joined by N hydroxymethyl acrylamide in deionized water, add Sodium Silicofluoride after stirring, be uniformly mixed 1-2 minute, add after clay being worn into fine powder, add each raw material of residue, raised temperature is 60-70 DEG C, is uniformly mixed 30-40 minute, obtains premixed liquid;

Be the TriMethylolPropane(TMP) of 1-2:5-7:100, stearic acid, Neodymium trioxide 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 Neutral 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 oven, sinter 4-6 hour at 300-350 DEG C, obtain described rare earth compounded magnetic conductive powder;

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

Described clay and the mass ratio of Neodymium trioxide are 70-90:1.

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

(1) each raw material in above-mentioned major ingredient except rare earth compounded magnetic conductive powder is sent into mixing tank, 2500-3000 rev/min is stirred mixed 2-3 hour, send into rotary kiln pre-burning, pre-burning 2-3 hour at 350-400 DEG C, send into grinding pot, add rare earth compounded magnetic conductive powder, being ground to fineness is 60-80 μm;

(2) additive is sent into grinding pot, add the tetrabutyl titanate of weight of additive 0.1-0.2%, the Span-80 of 0.02-0.1%, being ground to fineness is 50-70 μm;

(3) by each raw material mixing after above-mentioned process, add the water of compound weight 20-30%, the hydrolytic polymaleic anhydride of 1-2%, at 60-70 DEG C, be uniformly mixed 20-30 minute;

(4) spraying dry, is pressed into base, sintering, obtains the described clay-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 void content is low, mechanical property is strong, and crystal grain is uniform feature greatly.

Embodiment

Embodiment 1

For a clay-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 65.3 mol ₂o ₃, the manganese oxide of 15.7 mol, the zinc oxide of 13.0 mol, the silicon-dioxide of 3.1mol, the calcium chloride of 0.2mol, the Neodymium trioxide of 0.02 mol, the rare earth compounded magnetic conductive powder of 0.02 mol; Additive comprises according to the mass ratio range accounting for described ferrite core material: the barium oxide of the cobalt oxide of 40ppm, the strontium 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 made up of the raw material of following weight parts:

Clay 70, aluminum stearate 3, Sodium Silicofluoride 2, aminopropyl triethoxysilane 0.6, N hydroxymethyl acrylamide 1, deionized water 220;

Joined by N hydroxymethyl acrylamide in deionized water, add Sodium Silicofluoride after stirring, be uniformly mixed 1 minute, add after clay being worn into fine powder, add each raw material of residue, raised temperature is 70 DEG C, is uniformly mixed 30 minutes, obtains premixed liquid;

Be the TriMethylolPropane(TMP) of 2:7:100, stearic acid, Neodymium trioxide mixing by mass ratio, be uniformly mixed 30-40 minute at 65 DEG C, add the acetic acid that concentration is 20%, 100 revs/min of dispersed with stirring 4 minutes, add Neutral ammonium fluoride, be uniformly mixed 20 minutes, add premixed liquid, 500 revs/min of dispersed with stirring 1-2 hour, drying 30 minutes at 100 DEG C, send into sintering oven, sinter 6 hours at 350 DEG C, obtain described rare earth compounded magnetic conductive powder;

The mol ratio of described Neodymium trioxide, acetic acid, Neutral ammonium fluoride is 3:6:1;

Described clay and the mass ratio of Neodymium trioxide are 90:1.

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

(1) each raw material in above-mentioned major ingredient except rare earth compounded magnetic conductive powder is sent into mixing tank, 3000 revs/min are stirred mixed 3 hours, send into rotary kiln pre-burning, pre-burning 2 hours at 400 DEG C, send into grinding pot, add rare earth compounded magnetic conductive powder, being ground to fineness is 80 μm;

(2) additive is sent into grinding pot, add the tetrabutyl titanate of weight of additive 0.2%, the Span-80 of 0.02%, being ground to fineness is 70 μm;

(3) by each raw material mixing after above-mentioned process, add the water of compound weight 30%, the hydrolytic polymaleic anhydride of 2%, at 70 DEG C, be uniformly mixed 30 minutes;

(4) spraying dry, is pressed into base, sintering, obtains the described clay-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: 374 (100 ± 2 DEG C);

Curie temperature is higher than 240 DEG C.

Claims (2)

1., for a clay-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 60-65.3 mol ₂o ₃, the manganese oxide of 15.7-25 mol, the zinc oxide of 13.0-15 mol, the silicon-dioxide of 2-3.1mol, the calcium chloride of 0.1-0.2mol, the Neodymium trioxide of 0.01-0.02 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 barium oxide of the cobalt oxide of 30-40ppm, the strontium of 40-50ppm, 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 made up of the raw material of following weight parts:

Clay 65-70, aluminum stearate 2-3, Sodium Silicofluoride 1-2, aminopropyl triethoxysilane 0.6-1, N hydroxymethyl acrylamide 1-2, deionized water 180-220;

Joined by N hydroxymethyl acrylamide in deionized water, add Sodium Silicofluoride after stirring, be uniformly mixed 1-2 minute, add after clay being worn into fine powder, add each raw material of residue, raised temperature is 60-70 DEG C, is uniformly mixed 30-40 minute, obtains premixed liquid;

Be the TriMethylolPropane(TMP) of 1-2:5-7:100, stearic acid, Neodymium trioxide 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 Neutral 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 oven, sinter 4-6 hour at 300-350 DEG C, obtain described rare earth compounded magnetic conductive powder;

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

Described clay and the mass ratio of Neodymium trioxide are 70-90:1.

2., as claimed in claim 1 for a preparation method for the clay-based ferrite core material of transformer, it is characterized in that comprising the following steps:

(1) each raw material in above-mentioned major ingredient except rare earth compounded magnetic conductive powder is sent into mixing tank, 2500-3000 rev/min is stirred mixed 2-3 hour, send into rotary kiln pre-burning, pre-burning 2-3 hour at 350-400 DEG C, send into grinding pot, add rare earth compounded magnetic conductive powder, being ground to fineness is 60-80 μm;

(2) additive is sent into grinding pot, add the tetrabutyl titanate of weight of additive 0.1-0.2%, the Span-80 of 0.02-0.1%, being ground to fineness is 50-70 μm;

(3) by each raw material mixing after above-mentioned process, add the water of compound weight 20-30%, the hydrolytic polymaleic anhydride of 1-2%, at 60-70 DEG C, be uniformly mixed 20-30 minute;

(4) spraying dry, is pressed into base, sintering, obtains the described clay-based ferrite core material for transformer.