CN104124023A - Lithium-based rare earth ferromagnetic core material - Google Patents
Lithium-based rare earth ferromagnetic core material Download PDFInfo
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- CN104124023A CN104124023A CN201410287810.XA CN201410287810A CN104124023A CN 104124023 A CN104124023 A CN 104124023A CN 201410287810 A CN201410287810 A CN 201410287810A CN 104124023 A CN104124023 A CN 104124023A
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Abstract
The invention discloses a lithium-based rare earth ferromagnetic core material which comprises a main material and an additive. The main material comprises, by male ratio, Fe2O3 60.3-70mols, manganese oxide 27-30mols, zinc oxide 10.2-15mols and calcium sulfate 0.1-0.2mol. The additive comprises, by weight ratio accounting for a ferromagnetic core material, zinc borate 30-40ppm, strontium 10-20ppm and lithium-based rare earth composite magnetic conducting powder 800-1000ppm. In the lithium-based rare earth ferromagnetic core material, the rare earth composite magnetic conducting powder containing the ferromagnetic core material is high in magnetic energy product, stable in magnetism and capable of obviously improving the mechanical performance of the ferromagnetic core material and reducing the gas hole ratio.
Description
Technical field
The present invention relates generally to oxidate magnetic material and manufactures field, relates in particular to a kind of lithium base Rare-earth Iron 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 in order to make up the defect of prior art, and a kind of lithium base Rare-earth Iron core material is provided.
The present invention is achieved by the following technical solutions:
A lithium base Rare-earth Iron core material, it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the calcium sulfate of the manganese oxide of the Fe2O3 of 60.3-70 mol, 27-30 mol, the zinc oxide of 10.2-15 mol, 0.1-0.2 mol; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the lithium base rare earth compounded magnetic conductive powder of the Firebrake ZB of 30-40ppm, the strontium of 10-20ppm, 800-1000ppm;
The preparation of described lithium base rare earth compounded magnetic conductive powder comprises the following steps:
(1) preparation of lithium colloidal sol:
Hectorite is mixed with shitosan, grind evenly, join in deionized water, after stirring, add HPMA, at 60-80 ℃, be uniformly mixed 10-20 minute, obtain described lithium colloidal sol;
(2) polyvinylpyrrolidone is joined in lanthanum chloride solution, at 60-80 ℃, be uniformly mixed 10-20 minute, add ammonium bicarbonate aqueous solution, insulation 3-5h, adds above-mentioned lithium colloidal sol, is stirred to normal temperature, centrifugal dehydration, 200 ℃ of dry 30-40 minute of 100-, calcine 3-5 hour at 200-300 ℃, obtain described rare earth compounded magnetic conductive powder;
The concentration of described lanthanum chloride solution is 0.8-2mol/L; The concentration of ammonium bicarbonate aqueous solution is that 20-30%, consumption are the 30-40% of lanthanum chloride solution weight;
Described polyvinylpyrrolidone and the mol ratio of lanthanum chloride are 1-2:1;
Described hectorite and the mass ratio of lanthanum chloride are 60-100:1;
The mass ratio of described hectorite, shitosan, deionized water, HPMA is 100:6-10:500-600:5-8.
A preparation method for lithium base Rare-earth Iron 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 rotary furnace pre-burning, control 400 ℃ of temperature 300-, the pre-burning time is 2-4 hour, sends into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, being ground to fineness is 40-100 μ m;
(2) additive is sent into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, be wherein added with and be equivalent to the polyvinylpyrrolidone of weight of additive 0.4-1%, the polyvinyl alcohol of 0.3-1%, being ground to fineness is 20-30 μ m;
(3) each raw material after above-mentioned processing is mixed, spraying is dry, is pressed into base, and sintering, obtains described lithium base Rare-earth Iron core material.
Advantage of the present invention is:
Lithium base rare earth compounded magnetic conductive powder good weatherability, magnetic energy product that ferromagnetic core material of the present invention adds are high, and magnetic stability can obviously improve the mechanical performance of ferromagnetic core material, reduces the porosity.
Embodiment
Embodiment 1
A lithium base Rare-earth Iron core material, is characterized in that it comprises major ingredient and additive, and described major ingredient comprises according to mol ratio: the Fe2O3 of 60.3 mol, the manganese oxide of 30 mol, the calcium sulfate of the zinc oxide of 10.2mol, 0.1mol; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the lithium base rare earth compounded magnetic conductive powder of the Firebrake ZB of 40ppm, the strontium of 20ppm, 1000ppm;
The preparation of described lithium base rare earth compounded magnetic conductive powder comprises the following steps:
(1) preparation of lithium colloidal sol:
Hectorite is mixed with shitosan, grind evenly, join in deionized water, after stirring, add HPMA, at 80 ℃, be uniformly mixed 20 minutes, obtain described lithium colloidal sol;
(2) polyvinylpyrrolidone is joined in lanthanum chloride solution, at 80 ℃, be uniformly mixed 20 minutes, add ammonium bicarbonate aqueous solution, insulation 5h, adds above-mentioned lithium colloidal sol, is stirred to normal temperature, centrifugal dehydration, 200 ℃ dry 30 minutes, calcine 5 hours at 300 ℃, obtain described rare earth compounded magnetic conductive powder;
The concentration of described lanthanum chloride solution is 0.8mol/L; The concentration of ammonium bicarbonate aqueous solution is 30%, consumption is 40% of lanthanum chloride solution weight;
Described polyvinylpyrrolidone and the mol ratio of lanthanum chloride are 2:1;
Described hectorite and the mass ratio of lanthanum chloride are 100:1;
The mass ratio of described hectorite, shitosan, deionized water, HPMA is 100:10:600:5.
A preparation method for lithium base Rare-earth Iron 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 rotary furnace pre-burning, control 400 ℃ of temperature, and the pre-burning time is 4 hours, sends into grinding pot, adopts the alcohol water blend that abrasive media is 20%, and being ground to fineness is 100 μ m;
(2) additive is sent into grinding pot, adopt the alcohol water blend that abrasive media is 20%, be wherein added with and be equivalent to the polyvinylpyrrolidone of weight of additive 0.4-1%, 0.3% polyvinyl alcohol, being ground to fineness is 20 μ m;
(3) each raw material after above-mentioned processing is mixed, spraying is dry, is pressed into base, and sintering, obtains described lithium base Rare-earth Iron core material.
Through detection, the basic mechanical design feature index that the product of above-described embodiment 1 gained reaches:
The saturation induction density of magnetic core of the present invention can reach 15000 Gausses, and saturation flux rate density is 473mT, and Curie temperature is higher than 240 ℃, resistivity 6.3 Ω .m.
Claims (2)
1. a lithium base Rare-earth Iron core material, it is characterized in that it comprises major ingredient and additive, described major ingredient comprises according to mol ratio: the calcium sulfate of the manganese oxide of the Fe2O3 of 60.3-70 mol, 27-30 mol, the zinc oxide of 10.2-15 mol, 0.1-0.2 mol; Additive comprises according to the weight ratio meter that accounts for described ferromagnetic core material: the lithium base rare earth compounded magnetic conductive powder of the Firebrake ZB of 30-40ppm, the strontium of 10-20ppm, 800-1000ppm;
The preparation of described lithium base rare earth compounded magnetic conductive powder comprises the following steps:
(1) preparation of lithium colloidal sol:
Hectorite is mixed with shitosan, grind evenly, join in deionized water, after stirring, add HPMA, at 60-80 ℃, be uniformly mixed 10-20 minute, obtain described lithium colloidal sol;
(2) polyvinylpyrrolidone is joined in lanthanum chloride solution, at 60-80 ℃, be uniformly mixed 10-20 minute, add ammonium bicarbonate aqueous solution, insulation 3-5h, adds above-mentioned lithium colloidal sol, is stirred to normal temperature, centrifugal dehydration, 200 ℃ of dry 30-40 minute of 100-, calcine 3-5 hour at 200-300 ℃, obtain described rare earth compounded magnetic conductive powder;
The concentration of described lanthanum chloride solution is 0.8-2mol/L; The concentration of ammonium bicarbonate aqueous solution is that 20-30%, consumption are the 30-40% of lanthanum chloride solution weight;
Described polyvinylpyrrolidone and the mol ratio of lanthanum chloride are 1-2:1;
Described hectorite and the mass ratio of lanthanum chloride are 60-100:1;
The mass ratio of described hectorite, shitosan, deionized water, HPMA is 100:6-10:500-600:5-8.
2. a preparation method for lithium base Rare-earth Iron 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 rotary furnace pre-burning, control 400 ℃ of temperature 300-, the pre-burning time is 2-4 hour, sends into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, being ground to fineness is 40-100 μ m;
(2) additive is sent into grinding pot, adopt the alcohol water blend that abrasive media is 15-20%, be wherein added with and be equivalent to the polyvinylpyrrolidone of weight of additive 0.4-1%, the polyvinyl alcohol of 0.3-1%, being ground to fineness is 20-30 μ m;
(3) each raw material after above-mentioned processing is mixed, spraying is dry, is pressed into base, and sintering, obtains described lithium base Rare-earth Iron core material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106876081A (en) * | 2016-12-30 | 2017-06-20 | 铜陵瑞博电子科技有限公司 | A kind of switching mode power supply transformer organic nano core material of doping elemental lithium and preparation method thereof |
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| CN103771845A (en) * | 2012-10-18 | 2014-05-07 | Tdk株式会社 | Ferrite sintered body |
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2014
- 2014-06-25 CN CN201410287810.XA patent/CN104124023A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09183621A (en) * | 1995-12-28 | 1997-07-15 | Fuji Elelctrochem Co Ltd | Oxide magnetic material and oxide magnetic body |
| 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 |
| CN101038807A (en) * | 2006-02-08 | 2007-09-19 | Tdk株式会社 | Ferrite material |
| CN103771845A (en) * | 2012-10-18 | 2014-05-07 | Tdk株式会社 | Ferrite sintered body |
| 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 |
| CN103382107A (en) * | 2013-06-26 | 2013-11-06 | 蚌埠市高华电子有限公司 | Magnetic core material with high magnetic permeability and preparation method thereof |
| CN103396109A (en) * | 2013-06-26 | 2013-11-20 | 蚌埠市高华电子有限公司 | High-frequency low-loss soft magnetic ferrite core material and its preparation method |
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| 韩志全，廖 杨，冯 涛: "氧化物法低温烧结 Li 系铁氧体的固相反应、致密化过程及微波性能", 《磁性材料及器件》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106876081A (en) * | 2016-12-30 | 2017-06-20 | 铜陵瑞博电子科技有限公司 | A kind of switching mode power supply transformer organic nano core material of doping elemental lithium and preparation method thereof |
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Application publication date: 20141029 |