CN104844187A - Permanent magnetic ferrite material containing rare earth and preparation method thereof - Google Patents
Permanent magnetic ferrite material containing rare earth and preparation method thereof Download PDFInfo
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- CN104844187A CN104844187A CN201510212070.8A CN201510212070A CN104844187A CN 104844187 A CN104844187 A CN 104844187A CN 201510212070 A CN201510212070 A CN 201510212070A CN 104844187 A CN104844187 A CN 104844187A
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Abstract
The invention discloses a permanent magnetic ferrite material containing rare earth and a preparation method thereof. The material is characterized by being prepared through raw materials of, by weight part, 100 to 140 of iron fine powder, 3 to 5 of barium carbonate, 2 to 3 of anhydrous strontium chloride, 0.6 to 0.9 of lanthanum oxide, 0.3 to 0.6 of boric acids, 0.4 to 0.8 of calcium gluconate, 0.7 to 1.4 of polyving akohol and the appropriate amount of water. By means of the material and the preparation method thereof, the lanthanum oxide is added, so that the sintering temperature is reduced, grains are refined, and the sintering compactness is improved; the added boric acids provide a grain fluxing and refining effect. The permanent magnetic ferrite material is simple in preparation process, rich in material source, low in production cost, good in magnetic performance, wide in application range and worth popularizing.
Description
Technical field
The present invention relates to permanent-magnet ferrite material field, be specifically related to a kind of permanent-magnet ferrite material containing rare earth and preparation method thereof.
Background technology
Permanent-magnet ferrite is also known as hard ferrite, and it is a kind of permanent magnet material that Current production is maximum, the same with other permanent magnet products, only needs outside to provide the energy that once magnetizes just can produce constant magnetic field.Since this material comes out, technology just improves constantly range of product constantly increases, and manufacturing process is constantly improved, and range of application constantly expands, so Social benefit and economic benefit constantly increases.At present, the forming method of anisotropy sintered permanent ferrite mainly can be divided into wet moulding and dry-press process two kinds.In wet moulding, owing to there being the existence of the dispersion medium such as water or ethanol, therefore ferrite particle is easy to rotate, ferrite particle is easy to arrange along easy magnetization axis in magnetic field, this can make shaping ferrite obtain higher orientation degree, and therefore the ferrite of wet moulding can obtain higher magnetic property.But wet moulding needs to be discharged to outside die cavity by dispersion medium in extrusion forming process, and therefore productivity is lower; In addition, the requirement of wet moulding to production unit is higher, and production cost is also higher.In existing dry-press process, dry ferrite powder is directly filled in die cavity, then extrusion forming in magnetic field.Compared with wet moulding, owing to there is no dispersion medium, therefore the friction of ferrite paricles intergranular sharply increases, and there is inevitable adhesion in ferrite particle in drying course, the degree causing ferrite particle to arrange along easy magnetization axis obviously reduces, this can make shaping ferritic orientation degree reduce, and the magnetic property that therefore in prior art, the ferrite of dry-press process obtains is poor.But it is fast that dry-press process has shaping speed, the advantages such as production efficiency is high, and molding device is simple.
Summary of the invention
The object of this invention is to provide a kind of permanent-magnet ferrite material containing rare earth and preparation method thereof.
In order to realize object of the present invention, the present invention is by following scheme implementation:
A kind of permanent-magnet ferrite material containing rare earth and preparation method thereof, is made up of the raw material of following weight part: Iron concentrate 100-140, barium carbonate 3-5, anhydrous strontium chloride 2-3, lanthanum trioxide 0.6-0.9, boric acid 0.3-0.6, calglucon 0.4-0.8, polyvinyl alcohol 0.7-1.4, water are appropriate;
A kind of permanent-magnet ferrite material containing rare earth of the present invention and preparation method thereof, be made up of following concrete steps:
(1) Iron concentrate and barium carbonate are weighed and be placed on stirrer and stir, then be placed in ball mill ball milling 3-5h, rotating speed is 70r/min, and pellet water ratio is 1: 14: 1.5;
(2) delivered in kiln by the material oven dry dehvery pump mixed after above-mentioned ball milling and carry out pre-burning, sintering temperature is 1150-1350 ° of C, soaking time 3 hours;
(3) above-mentioned Preburning material is added in jaw crusher carries out fragmentation, size controlling is at below 30mm, get 30-40% Preburning material and except polyvinyl alcohol, calglucon all the other remaining compositions be added in ball mill and carry out secondary ball milling, the median size of particle controls at 1.5-1.8 μm, again remaining Preburning material is also carried out secondary ball milling, two portions material and calglucon, at 1.9-2.1 μm, finally mix and mix by size controlling;
(4) powder after step (3) fine grinding is added clear water washing several times, be added in drying kiln after washing and fool into dry powder, then is sent in kiln and carry out anneal, temperature controls at 800-1000 ° of C, and be incubated 0.5-1 hour, moisture control is below 6%;
(5) powder of step (4) and polyvinyl alcohol are mixed evenly, and it is dry-pressing formed to be placed in magnetic field, magnetic field size is 8000Oe, forming pressure is 5-10MPa, sinter shaping ferrite, sintering temperature is 1200-1300 ° of C, can obtain after sintering 1-2h.
Advantage of the present invention is: the Iron concentrate that the present invention adopts local abundant iron sand resource to prepare is as raw materials, reduce production cost, powder is first roughly ground and fine grinding process, the powder particles of preparation is evenly distributed, crystal grain destroys little, wash the cohesiveness removed between magnetic with clear water after mill, ensure pattern and the magnetic property of the magnetic in subsequent handling, anneal operation eliminates the lattice imperfection produced in fine grinding process, magnetic particle capability is made to reach maximum value, the lanthanum trioxide added reduces sintering temperature, and refinement crystal grain, improve the compactness of sintering, the boric acid added has the effect of fluxing with crystal grain thinning, permanent-magnet ferrite preparation technology of the present invention is simple, abundant raw material source, production cost is low, there is good magnetic behavior, have wide range of applications, be worthy to be popularized.
Embodiment
Below by specific examples, the present invention is described in detail.
A kind of permanent-magnet ferrite material containing rare earth and preparation method thereof, is made up of the raw material of following weight part (kilogram): Iron concentrate 130, barium carbonate 4, anhydrous strontium chloride 3, lanthanum trioxide 0.7, boric acid 0.5, calglucon 0.7, polyvinyl alcohol 1.2, water are appropriate;
A kind of permanent-magnet ferrite material containing rare earth of the present invention and preparation method thereof, be made up of following concrete steps:
(1) Iron concentrate and barium carbonate are weighed and be placed on stirrer and stir, then be placed in ball mill ball milling 4h, rotating speed is 70r/min, and pellet water ratio is 1: 14: 1.5;
(2) delivered in kiln by the material oven dry dehvery pump mixed after above-mentioned ball milling and carry out pre-burning, sintering temperature is 1250 ° of C, soaking time 3 hours;
(3) above-mentioned Preburning material is added in jaw crusher carries out fragmentation, size controlling is at below 30mm, get 30% Preburning material and except polyvinyl alcohol, calglucon all the other remaining compositions be added in ball mill and carry out secondary ball milling, the median size of particle controls at 1.7 μm, again remaining Preburning material is also carried out secondary ball milling, two portions material and calglucon, at 1.9 μm, finally mix and mix by size controlling;
(4) powder after step (3) fine grinding is added clear water washing several times, be added in drying kiln after washing and fool into dry powder, then sent in kiln and carry out anneal, temperature controls at 900 ° of C, and be incubated 0.5 hour, moisture control is below 6%;
(5) powder of step (4) and polyvinyl alcohol are mixed evenly, and it is dry-pressing formed to be placed in magnetic field, magnetic field size is 8000Oe, and forming pressure is 7MPa, sinters shaping ferrite, and sintering temperature is 1260 ° of C, can obtain after sintering 2h.
Carry out test to the permanent-magnet ferrite magnetic behavior in embodiment to obtain:
Remanent magnetism Br >=500mT;
Coercivity H b >=310kA/m;
HCJ Hcj >=410kA/m;
Maximum magnetic energy product (BH) max>=35kJ/m
3.
Claims (2)
1. permanent-magnet ferrite material containing rare earth and preparation method thereof, it is characterized in that, be made up of the raw material of following weight part: Iron concentrate 100-140, barium carbonate 3-5, anhydrous strontium chloride 2-3, lanthanum trioxide 0.6-0.9, boric acid 0.3-0.6, calglucon 0.4-0.8, polyvinyl alcohol 0.7-1.4, water are appropriate.
2. a kind of permanent-magnet ferrite material containing rare earth and preparation method thereof according to claim 1, is characterized in that, be made up of following concrete steps:
(1) Iron concentrate and barium carbonate are weighed and be placed on stirrer and stir, then be placed in ball mill ball milling 3-5h, rotating speed is 70r/min, and pellet water ratio is 1: 14: 1.5;
(2) deliver in kiln with dehvery pump after being dried by the material mixed after above-mentioned ball milling and carry out pre-burning, sintering temperature is 1150-1350 ° of C, soaking time 3 hours;
(3) above-mentioned Preburning material is added in jaw crusher carries out fragmentation, size controlling is at below 30mm, get 30-40% Preburning material and except polyvinyl alcohol, calglucon all the other remaining compositions be added in ball mill and carry out secondary ball milling, the median size of particle controls at 1.5-1.8 μm, again remaining Preburning material is also carried out secondary ball milling, two portions material and calglucon, at 1.9-2.1 μm, finally mix and mix by size controlling;
(4) powder after step (3) fine grinding is added clear water washing several times, be added in drying kiln after washing and fool into dry powder, then is sent in kiln and carry out anneal, temperature controls at 800-1000 ° of C, and be incubated 0.5-1 hour, moisture control is below 6%;
(5) powder of step (4) and polyvinyl alcohol are mixed evenly, and it is dry-pressing formed to be placed in magnetic field, magnetic field size is 8000Oe, forming pressure is 5-10MPa, sinter shaping ferrite, sintering temperature is 1200-1300 ° of C, can obtain after sintering 1-2h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105174929A (en) * | 2015-09-15 | 2015-12-23 | 重庆通赛机电有限公司 | Permanent magnetic ferrite for automobile motor and manufacturing method of permanent magnetic ferrite |
| CN107651711A (en) * | 2017-09-27 | 2018-02-02 | 安徽中磁高科有限公司 | A kind of high-performance permanent magnetic ferrite material and its production method |
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| CN101202138A (en) * | 2007-09-30 | 2008-06-18 | 常州迪迩磁性材料有限公司 | Permanent ferrite magnetic tile and preparation method thereof |
| CN101894648A (en) * | 2010-07-02 | 2010-11-24 | 北矿磁材科技股份有限公司 | Bonded ferrite magnetic powder, preparation method thereof and bonded permanent magnet |
| CN102815934A (en) * | 2012-08-13 | 2012-12-12 | 镇江金港磁性元件有限公司(中外合资） | High performance calcium lanthanum ferrite permanent magnet material and preparation method thereof |
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2015
- 2015-04-29 CN CN201510212070.8A patent/CN104844187A/en active Pending
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| US5132255A (en) * | 1988-01-20 | 1992-07-21 | Takeda Chemical Industries, Ltd. | Plastic compositions of inorganic powders and sintered bodies of the same |
| CN101202138A (en) * | 2007-09-30 | 2008-06-18 | 常州迪迩磁性材料有限公司 | Permanent ferrite magnetic tile and preparation method thereof |
| CN101894648A (en) * | 2010-07-02 | 2010-11-24 | 北矿磁材科技股份有限公司 | Bonded ferrite magnetic powder, preparation method thereof and bonded permanent magnet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105174929A (en) * | 2015-09-15 | 2015-12-23 | 重庆通赛机电有限公司 | Permanent magnetic ferrite for automobile motor and manufacturing method of permanent magnetic ferrite |
| CN107651711A (en) * | 2017-09-27 | 2018-02-02 | 安徽中磁高科有限公司 | A kind of high-performance permanent magnetic ferrite material and its production method |
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