CN104064312A - Carbon-based ferrite magnetic core material for transformer - Google Patents
Carbon-based ferrite magnetic core material for transformer Download PDFInfo
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- CN104064312A CN104064312A CN201410285251.9A CN201410285251A CN104064312A CN 104064312 A CN104064312 A CN 104064312A CN 201410285251 A CN201410285251 A CN 201410285251A CN 104064312 A CN104064312 A CN 104064312A
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Abstract
The invention discloses a carbon-based ferrite magnetic core material for a transformer. The material comprises major ingredients and additives, wherein the major ingredients comprise 58 to 65.4 moles of Fe2O3, 16.3 to 21 moles of manganese oxide, 9.4 to 13 moles of zinc oxide, 1.2 to 2 moles of chromium oxide, 0.1 to 0.2 mole of ferrous disulfide, 0.6 to 1 mole of calcium oxide and 0.01 to 0.02 mole of rare earth composite magnetic-conducting powder according to a molar ratio; the additives comprise 100 to 200 parts per million of aluminum oxide, 60 to 100 parts per million of tin oxide and 50 to 70 parts per million of aluminum silicate based on the weight of the ferrite magnetic core material. The rare earth composite magnetic-conducting powder added to the ferrite magnetic core material has a magnetic energy product and stable 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
Technical field
The present invention relates generally to oxidate magnetic material and manufactures field, relates in particular to a kind of carbon back ferrite magnetic 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 carbon back ferrite magnetic core material for transformer is provided.
The present invention is achieved by the following technical solutions:
A kind of carbon back ferrite magnetic 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 calcium oxide of the manganese oxide of the Fe2O3 of 58-65.4 mol, 16.3-21 mol, the zinc oxide of 9.4-13 mol, the ferrous disulfide of the chromium oxide of 1.2-2mol, 0.1-0.2mol, 0.6-1 mol, 0.01-0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the alumina silicate of the aluminium oxide of 100-200ppm, the tin oxide of 60-100ppm, 50-70ppm;
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:
Nano-carbon powder 50-60, absolute ethyl alcohol 100-150, trimethylolpropane 2-3, calgon 2-3, deionized water 100-200;
Calgon is joined in deionized water, stir;
Nano-carbon powder is joined in absolute ethyl alcohol, after stirring, add trimethylolpropane, insulated and stirred 10-20 minute at 55-60 ℃;
Each raw material after above-mentioned processing is mixed, and 1000-1200 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 nano-carbon powder and the mass ratio of neodymia are 90-100:1.
A preparation method for the carbon back ferrite magnetic core material of transformer, comprises the following steps:
(1) each raw material except rare earth compounded magnetic conductive powder in above-mentioned major ingredient is sent into blending tank, 2500-3000 rev/min is stirred mixed 2-3 hour, send into rotary furnace pre-burning, pre-burning 2-3 hour at 350-400 ℃, send into grinding pot, add rare earth compounded magnetic conductive powder, being ground to fineness is 60-80 μ m;
(2) additive is sent into grinding pot, add the calcium acetylacetonate of weight of additive 0.1-0.2%, the polyethylene glycol of 0.8-1%, being ground to fineness is 50-70 μ m;
(3) each raw material after above-mentioned processing is mixed, add the water of compound weight 20-30%, the ammonium persulfate of 1-2%, at 60-70 ℃, be uniformly mixed 20-30 minute;
(4) spraying is dry, is pressed into base, and sintering obtains the described carbon back ferrite magnetic 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 carbon back ferrite magnetic 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 calcium oxide of the Fe2O3 of 65.4 mol, the manganese oxide of 16.3mol, the zinc oxide of 9.4 mol, the ferrous disulfide of the chromium oxide of 1.2mol, 0.2mol, 0.6 mol, 0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the alumina silicate of the aluminium oxide of 200ppm, the tin oxide of 100ppm, 70ppm;
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:
Nano-carbon powder 60, absolute ethyl alcohol 150, trimethylolpropane 3, calgon 3, deionized water 200;
Calgon is joined in deionized water, stir;
Nano-carbon powder is joined in absolute ethyl alcohol, after stirring, add trimethylolpropane, insulated and stirred 10-20 minute at 60 ℃;
Each raw material after above-mentioned processing is mixed, and 1200 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 ℃, be uniformly mixed 40 minutes, adding concentration is 20% acetic acid, 100 revs/min of dispersed with stirring 6 minutes, add ammonium fluoride, be uniformly mixed 30 minutes, add premixed liquid, 500 revs/min of dispersed with stirring 2 hours, at 100 ℃, be dried 30 minutes, send into sintering furnace, sintering is 6 hours at 350 ℃, obtains described rare earth compounded magnetic conductive powder;
The mol ratio of described neodymia, acetic acid, ammonium fluoride is 2:7:2;
Described nano-carbon powder and the mass ratio of neodymia are 100:1.
A preparation method for the carbon back ferrite magnetic core material of transformer, comprises the following steps:
(1) each raw material except rare earth compounded magnetic conductive powder in above-mentioned major ingredient is sent into blending tank, 3000 revs/min are stirred mixed 3 hours, send into rotary furnace pre-burning, at 400 ℃, pre-burning is 2 hours, send into grinding pot, add rare earth compounded magnetic conductive powder, being ground to fineness is 80 μ m;
(2) additive is sent into grinding pot, add the calcium acetylacetonate of weight of additive 0.2%, 0.8% polyethylene glycol, being ground to fineness is 70 μ m;
(3) each raw material after above-mentioned processing is mixed, add the water of compound weight 30%, 1% ammonium persulfate, at 70 ℃, be uniformly mixed 30 minutes;
(4) spraying is dry, is pressed into base, and sintering obtains the described carbon back ferrite magnetic 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: 391 (100 ± 2 ℃);
Curie temperature is higher than 240 ℃.
Claims (2)
1. the carbon back ferrite magnetic 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 calcium oxide of the manganese oxide of the Fe2O3 of 58-65.4 mol, 16.3-21 mol, the zinc oxide of 9.4-13 mol, the ferrous disulfide of the chromium oxide of 1.2-2mol, 0.1-0.2mol, 0.6-1 mol, 0.01-0.02 mol; Additive comprises according to the weight ratio meter that accounts for described ferrite magnetic core material: the alumina silicate of the aluminium oxide of 100-200ppm, the tin oxide of 60-100ppm, 50-70ppm;
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:
Nano-carbon powder 50-60, absolute ethyl alcohol 100-150, trimethylolpropane 2-3, calgon 2-3, deionized water 100-200;
Calgon is joined in deionized water, stir;
Nano-carbon powder is joined in absolute ethyl alcohol, after stirring, add trimethylolpropane, insulated and stirred 10-20 minute at 55-60 ℃;
Each raw material after above-mentioned processing is mixed, and 1000-1200 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 nano-carbon powder and the mass ratio of neodymia are 90-100:1.
2. a preparation method for the carbon back ferrite magnetic core material for transformer as claimed in claim 1, is characterized in that comprising the following steps:
(1) each raw material except rare earth compounded magnetic conductive powder in above-mentioned major ingredient is sent into blending tank, 2500-3000 rev/min is stirred mixed 2-3 hour, send into rotary furnace pre-burning, pre-burning 2-3 hour at 350-400 ℃, send into grinding pot, add rare earth compounded magnetic conductive powder, being ground to fineness is 60-80 μ m;
(2) additive is sent into grinding pot, add the calcium acetylacetonate of weight of additive 0.1-0.2%, the polyethylene glycol of 0.8-1%, being ground to fineness is 50-70 μ m;
(3) each raw material after above-mentioned processing is mixed, add the water of compound weight 20-30%, the ammonium persulfate of 1-2%, at 60-70 ℃, be uniformly mixed 20-30 minute;
(4) spraying is dry, is pressed into base, and sintering obtains the described carbon back ferrite magnetic core material for transformer.
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| CN201410285251.9A CN104064312A (en) | 2014-06-24 | 2014-06-24 | Carbon-based ferrite magnetic core material for transformer |
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| CN201410285251.9A CN104064312A (en) | 2014-06-24 | 2014-06-24 | Carbon-based ferrite magnetic core material for transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205941A (en) * | 2016-08-17 | 2016-12-07 | 安徽德信电气有限公司 | A kind of heat shock resistance core material |
Citations (5)
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|---|---|---|---|---|
| CN1455938A (en) * | 2000-12-15 | 2003-11-12 | 住友特殊金属株式会社 | Permanent magnet and method for preparation thereof |
| JP2009012999A (en) * | 2007-07-03 | 2009-01-22 | Jfe Ferrite Corp | Mn-Zn-Co-BASED FERRITE |
| CN102795850A (en) * | 2012-09-13 | 2012-11-28 | 重庆材料研究院 | Wide-temperature ultralow-loss manganese zinc power ferrite magnetic core |
| CN102976741A (en) * | 2012-11-23 | 2013-03-20 | 天长市昭田磁电科技有限公司 | Preparation method of manganese zinc MnZn soft magnetic ferrite material containing modified nanocarbon |
| CN103496963A (en) * | 2013-09-06 | 2014-01-08 | 江门安磁电子有限公司 | Ni-free MnZn ferrite magnetic core with double characteristics and manufacture method |
-
2014
- 2014-06-24 CN CN201410285251.9A patent/CN104064312A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455938A (en) * | 2000-12-15 | 2003-11-12 | 住友特殊金属株式会社 | Permanent magnet and method for preparation thereof |
| JP2009012999A (en) * | 2007-07-03 | 2009-01-22 | Jfe Ferrite Corp | Mn-Zn-Co-BASED FERRITE |
| CN102795850A (en) * | 2012-09-13 | 2012-11-28 | 重庆材料研究院 | Wide-temperature ultralow-loss manganese zinc power ferrite magnetic core |
| CN102976741A (en) * | 2012-11-23 | 2013-03-20 | 天长市昭田磁电科技有限公司 | Preparation method of manganese zinc MnZn soft magnetic ferrite material containing modified nanocarbon |
| CN103496963A (en) * | 2013-09-06 | 2014-01-08 | 江门安磁电子有限公司 | Ni-free MnZn ferrite magnetic core with double characteristics and manufacture method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205941A (en) * | 2016-08-17 | 2016-12-07 | 安徽德信电气有限公司 | A kind of heat shock resistance core material |
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