CN103613375A - Efficient iron-strontium mixed permanent magnet and processing process thereof - Google Patents
Efficient iron-strontium mixed permanent magnet and processing process thereof Download PDFInfo
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- CN103613375A CN103613375A CN201310621770.3A CN201310621770A CN103613375A CN 103613375 A CN103613375 A CN 103613375A CN 201310621770 A CN201310621770 A CN 201310621770A CN 103613375 A CN103613375 A CN 103613375A
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Abstract
The invention discloses an efficient iron-strontium mixed permanent magnet and a processing process thereof. The permanent magnet comprises the following components in percentage by weight: 3-5% of MnO2, 2.2-2.8% of Cr2O3, 4-5.5% of Al2O3, 2.5-3.5% of Si02, 0.002-0.012% of CaCO3, 0.1-0.12% of kaolin, 0.2-0.45% of Bi2O3, and the balance of a mixed raw material of Fe2O3 and SrCO3, wherein the molar ratio of Fe<3+> and Sr<2+> in the mixed raw material is 6:1.3, and after the components are subjected to presintering, crushing, secondary ball-milling, compression molding, sintering, grinding and cleaning, a product is obtained. The permanent magnet disclosed by the invention takes Fe2O3 and SrCO3 as a foundation bed, and is rich in source of raw materials, simple in process, and lower in production cost of enterprises; the diameter of crystalline grains of the permanent magnet disclosed by the invention is small, a direct gap of an overall product is small, and the density of products is large, the impact resistance and stability of the overall product are greatly enhanced, and the application range of low-cost permanent magnets is widened.
Description
Technical field
The present invention relates to permanent magnet material field, relate in particular to iron strontium hybrid permanent-magnet and complete processing thereof that a kind of overall performance is high.
Background technology
Magneticsubstance is the basic function material of electron trade.Permanent magnet material, as an important component part of magneticsubstance, plays an important role in industries such as electronic industry, information industry, motorcycle, Power Tools Industries, automotive industrys.Permanent-magnet ferrite material is exactly the functional materials that produces magnetic field.
Its resistivity of permanent-magnet ferrite is high, coercive force is large, can effectively be applied in air gaps magnetic circuit, is particularly suitable for doing the permanent magnet of small generator and electric motor.Permanent-magnet ferrite is not containing precious metal, and starting material source is abundant, and technique is simple, and cost is low, can replace Al-Ni-Co permanent magnet to manufacture magnetic separator, magnetic bearing, loud speaker, microwave device etc.But its maximum magnetic energy product is lower, and temperature stability is poor, quality is more crisp, frangible, and impact resisting vibrating, should not make metrical instrument and other accurate magnetic devices requiring.
summary of the invention
For the problem of above-mentioned existence, the invention provides iron strontium hybrid permanent-magnet and complete processing thereof that a kind of overall performance is high.
In order to achieve the above object, the technical solution used in the present invention is as follows: a kind of efficient iron strontium hybrid permanent-magnet, in described permanent magnet, the weight ratio of each component is: the Mn O of 3%-5%
2, the Cr of 2.2%-2.8%
2o
3, the Al of 4%-5.5%
2o
3, the Si0 of 2.5%-3.5%
2, the CaCO of 0.002%-0.012%
3, the kaolin of 0.1%-0.12%, the Bi of 0.2%-0.45%
2o
3, surplus is Fe
2o
3and SrCO
3mixing raw material, Fe in described mixing raw material
3+with Sr
2+mole example be 6:1.3.
Fe in mixing raw material
3+with Sr
2+mole example be 6:1.3, work as Sr
2+content when more, superfluous Sr
2+can cause growing up of crystal grain, and then cause the global density of product to diminish, remaining magnetic flux ability declines, and Fe
3content when more, the Sr of crystal grain part
2+element is less, causes the space of intergranule to become many, and then causes the quality of integral product more crisp, is unfavorable for the raising of product overall performance.
The complete processing of a kind of efficient iron strontium hybrid permanent-magnet of the present invention, described raw material obtains product, described mixing raw material Fe through pre-burning → pulverizing → secondary ball milling → compression moulding → sintering → grinding with after cleaning
2o
3and SrCO
3need in burn in step, join in reaction system, described auxiliary material joins in reaction system in pulverising step.
In pre-burning process of the present invention, under the protective condition of nitrogen, add mixing raw material Fe
2o
3and SrCO
3, being warmed up to gradually 400-450 ℃, the pressure in pre-burning stove remains on 2-3Mpa, pre-burning 1-2h.
In crushing process of the present invention, mixing raw material and auxiliary material after pre-burning is completed are mixed to join in pulverizer, under the environment of nitrogen protection, process, pulverizing by diameter, be 4um-6um.
In secondary ball milling process of the present invention, by ball mill, process, the treatment time is 7-11h, under the environment of nitrogen protection, process, the powder of ball mill by diameter, be 0.7-0.9um.
In the process of compression moulding of the present invention, by cold isostatic press, by product compression moulding in module, in the process of compacting, around just magneticstrength is 700-800kA/m, and the density of the product after compression moulding is 3.5-3.8g/cm
3.
In the process of sintering of the present invention, product after compression moulding is joined and in sintering oven, carries out sintering, sintering temperature is 1000-1100 ℃, sintering time is 4.5h-6h, then under the condition of 600 ℃-650 ℃, carry out one-level tempering respectively, tempering time is 3-4h, under the condition of 250 ℃-320 ℃, carries out second annealing, and tempering time is 1h.
In grinding of the present invention and cleaning process, adopt self-acting grinding machine and belt-type Ultrasonic Cleaners to operate, its surface roughness Ra is 2.5-5um, and the roughness on surface is lower, represent that in product, the gap of intergranule is less, the product overall performance of producing is high.
In sintering process of the present invention, need to control the size of crystal grain, the size of crystal grain remains on 0.8-1.2um, and the size of crystal grain is less, and the temperature stability of the product of making is high, and its shock-resistance and stability improve a lot.
The present invention is with Fe
2o
3and SrCO
3for the bedding of permanent magnet, adopt Mn O
2, Cr
2o
3, Al
2o
3, Si0
2, CaCO
3with kaolin be auxiliary material, starting material sources is abundant, technique is simple, the production cost of enterprise is low, the maximum magnetic energy product of the product of producing reaches 45.8-52.8KJ/m
3residual flux reaches 0.5-0.54T, magnetic strength coercive force has reached 390-420KA/m, exceeded the performance perameter of similar permanent-magnet ferrite on the market, the diameter of crystal grain of the present invention is less simultaneously, and the direct space of integral product is less, and the density of product is large, shock-resistance and the stability of its integral product are also greatly improved, and have improved the range of application of low-cost permanent magnet.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
embodiment 1:an efficient iron strontium hybrid permanent-magnet, in described permanent magnet, the weight ratio of each component is: 3% Mn O
2, 2.2% Cr
2o
3, 4% Al
2o
3, 2.5% Si0
2, 0.002% CaCO
3, 0.1% kaolin, 0.2% Bi
2o
3, surplus is Fe
2o
3and SrCO
3mixing raw material, Fe in described mixing raw material
3+with Sr
2+mole example be 6:1.3.
The complete processing of a kind of efficient iron strontium hybrid permanent-magnet of the present invention, described raw material obtains product, described mixing raw material Fe through pre-burning → pulverizing → secondary ball milling → compression moulding → sintering → grinding with after cleaning
2o
3and SrCO
3need in burn in step, join in reaction system, described auxiliary material joins in reaction system in pulverising step.
1), in pre-burning process, under the protective condition of nitrogen, add mixing raw material Fe
2o
3and SrCO
3, being warmed up to gradually 400 ℃, the pressure in pre-burning stove remains on 2Mpa, pre-burning 1h.
2), in crushing process, mixing raw material and auxiliary material after pre-burning is completed are mixed to join in pulverizer, under the environment of nitrogen protection, process, pulverizing by diameter, be 6um.
3) in secondary ball milling process, by ball mill, process, the treatment time is 7h, under the environment of nitrogen protection, process, the powder of ball mill by diameter, be 0.9um.
4) in the process of compression moulding, by cold isostatic press, by product compression moulding in module, in the process of compacting, around just magneticstrength is 70kA/m, and the density of the product after compression moulding is 3.5g/cm
3.
5) in the process of sintering, product after compression moulding is joined and in sintering oven, carries out sintering, sintering temperature is 1000 ℃, sintering time is 4.5h, then under the condition of 600 ℃, carries out respectively one-level tempering, and tempering time is 3h, under the condition of 250 ℃, carry out second annealing, tempering time is 1h, needs to control the size of crystal grain in sintering process of the present invention, and the size of crystal grain remains on 1.2um.
6) in grinding and cleaning process, adopt self-acting grinding machine and belt-type Ultrasonic Cleaners to operate, its surface roughness Ra is 5um.
The maximum magnetic energy product of the product of producing reaches 45.8KJ/m3, and residual flux reaches 0.5T, and magnetic strength coercive force has reached 390KA/m.
embodiment 2:an efficient iron strontium hybrid permanent-magnet, in described permanent magnet, the weight ratio of each component is: 5% MnO
2, 2.8% Cr
2o
3, 5.5% Al
2o
3, 3.5% Si0
2, 0.012% CaCO
3, 0.12% kaolin, 0.45% Bi
2o
3, surplus is Fe
2o
3and SrCO
3mixing raw material, Fe in described mixing raw material
3+with Sr
2+mole example be 6:1.3.
The complete processing of a kind of efficient iron strontium hybrid permanent-magnet of the present invention, described raw material obtains product, described mixing raw material Fe through pre-burning → pulverizing → secondary ball milling → compression moulding → sintering → grinding with after cleaning
2o
3and SrCO
3need in burn in step, join in reaction system, described auxiliary material joins in reaction system in pulverising step.
1), in pre-burning process, under the protective condition of nitrogen, add mixing raw material Fe
2o
3and SrCO
3, being warmed up to gradually 450 ℃, the pressure in pre-burning stove remains on 3Mpa, pre-burning 2h.
2), in crushing process, mixing raw material and auxiliary material after pre-burning is completed are mixed to join in pulverizer, under the environment of nitrogen protection, process, pulverizing by diameter, be 4um.
3) in secondary ball milling process, by ball mill, process, the treatment time is 11h, under the environment of nitrogen protection, process, the powder of ball mill by diameter, be 0.7um.
4) in the process of compression moulding, by cold isostatic press, by product compression moulding in module, in the process of compacting, around just magneticstrength is 800kA/m, and the density of the product after compression moulding is 3.8g/cm
3.
5) in the process of sintering, product after compression moulding is joined and in sintering oven, carries out sintering, sintering temperature is 1100 ℃, sintering time is 6h, then under the condition of 650 ℃, carries out respectively one-level tempering, and tempering time is 4h, under the condition of 320 ℃, carry out second annealing, tempering time is 1h, needs to control the size of crystal grain in sintering process of the present invention, and the size of crystal grain remains on 0.8um.
6) in grinding and cleaning process, adopt self-acting grinding machine and belt-type Ultrasonic Cleaners to operate, its surface roughness Ra is 2.5um.
The maximum magnetic energy product of the product of producing reaches 52.8KJ/m3, and residual flux reaches 0.54T, and magnetic strength coercive force has reached 420KA/m.
embodiment 3:an efficient iron strontium hybrid permanent-magnet, in described permanent magnet, the weight ratio of each component is: 4% MnO
2, 2.5% Cr
2o
3, 5% Al
2o
3, 3% Si0
2, 0.01% CaCO
3, 0.11% kaolin, 0.3% Bi
2o
3, surplus is Fe
2o
3and SrCO
3mixing raw material, Fe in described mixing raw material
3+with Sr
2+mole example be 6:1.3.
The complete processing of a kind of efficient iron strontium hybrid permanent-magnet of the present invention, described raw material obtains product, described mixing raw material Fe through pre-burning → pulverizing → secondary ball milling → compression moulding → sintering → grinding with after cleaning
2o
3and SrCO
3need in burn in step, join in reaction system, described auxiliary material joins in reaction system in pulverising step.
1), in pre-burning process, under the protective condition of nitrogen, add mixing raw material Fe
2o
3and SrCO
3, being warmed up to gradually 450 ℃, the pressure in pre-burning stove remains on 2.5Mpa, pre-burning 1.5h.
2), in crushing process, mixing raw material and auxiliary material after pre-burning is completed are mixed to join in pulverizer, under the environment of nitrogen protection, process, pulverizing by diameter, be 5um.
3) in secondary ball milling process, by ball mill, process, the treatment time is 10h, under the environment of nitrogen protection, process, the powder of ball mill by diameter, be 0.8um.
4) in the process of compression moulding, by cold isostatic press, by product compression moulding in module, in the process of compacting, around just magneticstrength is 750kA/m, and the density of the product after compression moulding is 3.7g/cm
3.
5) in the process of sintering, product after compression moulding is joined and in sintering oven, carries out sintering, sintering temperature is 1050 ℃, sintering time is 5h, then under the condition of 600 ℃, carries out respectively one-level tempering, and tempering time is 3h, under the condition of 320 ℃, carry out second annealing, tempering time is 1h, needs to control the size of crystal grain in sintering process of the present invention, and the size of crystal grain remains on 1.0um.
6) in grinding and cleaning process, adopt self-acting grinding machine and belt-type Ultrasonic Cleaners to operate, its surface roughness Ra is 4um.
The maximum magnetic energy product of the product of producing reaches 48.9KJ/m3, and residual flux has reached 0.52T, and magnetic strength coercive force has reached 405KA/m.
embodiment 4:the permanent magnet making in embodiment 1-3 and conventional on the market permanent magnet are under equal conditions carried out to performance comparison test, and result is as shown in the table:
There is upper table to find out, the maximum magnetic energy product of the permanent magnet of producing in embodiment of the present invention 1-3, the coercitive technical parameter of residual flux and magnetic strength is all greater than the ferrite permanent-magnet materials of buying on the market, improved the range of application of ferrite permanent-magnet materials, simultaneously convenient also due to commercially available ferrite permanent-magnet ability in tensile strength, shock resistance and the stability of product are enhanced, and have improved the range of application of low-cost permanent magnet.
It should be noted that, above-mentioned is only preferred embodiment of the present invention, is not used for limiting protection scope of the present invention, and the equivalents of having done on the basis of above-described embodiment all belongs to protection scope of the present invention.
Claims (9)
1. an efficient iron strontium hybrid permanent-magnet, is characterized in that, in described permanent magnet, the weight ratio of each component is: the MnO of 3%-5%
2, the Cr of 2.2%-2.8%
2o
3, the Al of 4%-5.5%
2o
3, the Si0 of 2.5%-3.5%
2, the CaCO of 0.002%-0.012%
3, the kaolin of 0.1%-0.12%, the Bi of 0.2%-0.45%
2o
3, surplus is Fe
2o
3and SrCO
3mixing raw material, Fe in described mixing raw material
3+with Sr
2+mole example be 6:1.3.
2. a complete processing for efficient iron strontium hybrid permanent-magnet, is characterized in that, described raw material obtains product, described mixing raw material Fe through pre-burning → pulverizing → secondary ball milling → compression moulding → sintering → grinding with after cleaning
2o
3and SrCO
3need in burn in step, join in reaction system, described auxiliary material joins in reaction system in pulverising step.
3. the complete processing of efficient iron strontium hybrid permanent-magnet according to claim 2, is characterized in that, in described pre-burning process, under the protective condition of nitrogen, adds mixing raw material Fe
2o
3and SrCO
3, being warmed up to gradually 400-450 ℃, the pressure in pre-burning stove remains on 2-3Mpa, pre-burning 1-2h.
4. the complete processing of efficient iron strontium hybrid permanent-magnet according to claim 2; it is characterized in that; in described crushing process; mixing raw material and auxiliary material after pre-burning is completed are mixed to join in pulverizer; under the environment of nitrogen protection, process, pulverizing by diameter, be 4um-6um.
5. the complete processing of efficient iron strontium hybrid permanent-magnet according to claim 2, is characterized in that, in described secondary ball milling process; by ball mill, process; treatment time is 7-11h, under the environment of nitrogen protection, process, the powder of ball mill by diameter, be 0.7-0.9um.
6. the complete processing of efficient iron strontium hybrid permanent-magnet according to claim 2, it is characterized in that, in the process of described compression moulding, by cold isostatic press by product compression moulding in module, in the process of compacting, around just magneticstrength is 700-800kA/m, and the density of the product after compression moulding is 3.5-3.8g/cm
3.
7. the complete processing of efficient iron strontium hybrid permanent-magnet according to claim 2, it is characterized in that, in the process of described sintering, product after compression moulding is joined in sintering oven and carries out sintering, and sintering temperature is 1000-1100 ℃, and sintering time is 4.5h-6h, then under the condition of 600 ℃-650 ℃, carry out one-level tempering respectively, tempering time is 3-4h, under the condition of 250 ℃-320 ℃, carries out second annealing, and tempering time is 1h.
8. the complete processing of efficient iron strontium hybrid permanent-magnet according to claim 2, is characterized in that, in described grinding and cleaning process, adopts self-acting grinding machine and belt-type Ultrasonic Cleaners to operate, and its surface roughness Ra is 2.5-5um.
9. the complete processing of efficient iron strontium hybrid permanent-magnet according to claim 7, needs to control the size of crystal grain in described sintering process, the size of crystal grain remains on 0.8-1.2um.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285758A (en) * | 2017-06-20 | 2017-10-24 | 合肥博之泰电子科技有限公司 | A kind of alloy magnetic material and its preparation technology |
| CN112500148A (en) * | 2020-11-27 | 2021-03-16 | 天长市中德电子有限公司 | Preparation method of high-coercivity strontium ferrite magnetic material |
-
2013
- 2013-11-30 CN CN201310621770.3A patent/CN103613375A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285758A (en) * | 2017-06-20 | 2017-10-24 | 合肥博之泰电子科技有限公司 | A kind of alloy magnetic material and its preparation technology |
| CN112500148A (en) * | 2020-11-27 | 2021-03-16 | 天长市中德电子有限公司 | Preparation method of high-coercivity strontium ferrite magnetic material |
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Application publication date: 20140305 |