CN107162578A - A kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor - Google Patents

A kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor Download PDF

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Publication number
CN107162578A
CN107162578A CN201710348867.XA CN201710348867A CN107162578A CN 107162578 A CN107162578 A CN 107162578A CN 201710348867 A CN201710348867 A CN 201710348867A CN 107162578 A CN107162578 A CN 107162578A
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parts
magnetic shoe
ball
manufacture method
electric motor
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CN201710348867.XA
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CN107162578B (en
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周国胜
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MAANSHAN QIJIN MAGNET CO Ltd
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MAANSHAN QIJIN MAGNET CO Ltd
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    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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Abstract

The invention belongs to the processing technique field of permanent ferrite magnetic tile, specifically related to a kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor, including raw material preparation, first time ball milling mixing, second ball milling mixing, compacting green compact and sinter several steps.The present invention has advantages below compared with prior art：By being dry grinded to raw material and stone mill ball milling twice in the present invention, change crystal microstructure, avoid the agglomeration of particle, increase the density of material, improve the degree of orientation of product, increase electroceramics fiber can improve residual magnetic flux density on this basis, reduce the fraction defective in magnetic shoe preparation process, improve its mechanical performance, at ambient temperature, HCJ reaches more than 380kA/m, the high magnetic characteristics of permanent-magnet ferrite needed for ensure that direct current variable frequency motor, the stability of properties of product is good, meet stability requirement of the maintenance direct current generator to required magnetic shoe.

Description

A kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor
Technical field
The invention belongs to the processing technique field of permanent ferrite magnetic tile, and in particular to a kind of high-performance micro direct current generator With the manufacture method of permanent ferrite magnetic tile.
Background technology
Permanent-magnet ferrite is a kind of indispensable basic material of national economy, it have abundant raw materials, it is cheap, Electricity-saving lamp feature, the development speed annual growth of China's permanent-magnet ferrite has reached 15-20%, and yield accounts for world's permanent-magnet ferrite On the 40% of total output, it is widely used in the fields such as automobile, household electrical appliance, motor device, and permanent ferrite magnetic tile is direct current Critical component in motivation, because the operating mode feature of high-performance micro direct current generator is initial resistance square height, of short duration exciting current Greatly, therefore it is required that on the one hand magnet will meet requirement of the motor to permanent magnetism on magnetic property, on the other hand to have in corresponding Coercivity is reported, to ensure in the presence of strong demagnetizing field, how the irreversible demagnetization that magnet did not occurred ensures oxygen magnet permanent magnetism While with high residual magnetic flux density, there is the industry target that high coercivity is magnetic material again, at present production Although Ci Cai producers it is a lot, level is not high, for electric injury anti-high and low-temp poor performance, and demagnetization rate reaches 20%, but rises at present Motivation requires demagnetization rate below 10%, simultaneously because starter condition of work is more severe, humidity is larger, it is desirable to resistance to height The performance of low temperature, therefore, the current technical issues that need to address be make magnetic shoe have higher residual magnetic flux density while, There is high HCJ again, and anti-high and low-temp demagnetization performance is good, it is necessary to further change from raw material proportioning and processing method Enter.
The content of the invention
The purpose of the present invention is that there is provided a kind of high-performance micro direct current generator permanent-magnet ferrite the problem of being directed to existing The manufacture method of magnetic shoe.
The present invention is achieved by the following technical solutions：A kind of high-performance micro permanent ferrite magnetic shoe for DC electric motor Manufacture method, including following process：
（1）Raw material prepares：By weight, 85-88 parts of Fe2O3, 3-4 parts of BaCO3, 4-6 parts of SrSO4, 1-2 parts NiO, 1-2 parts Sc2O3, 0.2-0.8 parts of Y2O3, 0.3-0.7 parts of In2O3, 0.2-0.8 parts of γ-Ga2O3, 0.1-0.5 parts of WO3, 0.1-0.5 parts electricity pottery Porcelain fiber；
The electroceramics fiber is lead lanthanum zirconate titanate piezoelectric ceramic fibers, is tripartite's phase perovskite structure, wherein cylindrical fibre A diameter of 250 μm, tensile strength is 25.28MPa；The length of side of square column fiber type is 300 μm, and tensile strength is 24.35MPa；
（2）Ball mill mixing：Electroceramics fiber, γ-Ga2O3 and Y will be removed in above-mentioned raw materials2O3Outer other raw materials mixing, With strong mixed machine with 400-600 revs/min of rotating speed by rotary blade by raw material mixing 3-3.5 hour, the particle diameter that discharges is less than 40 μm；
（3）Secondary ball milling batch mixing：Raw material after ball milling is added into surplus stock, and adds water and makees dispersant, control material： Ball：The weight ratio of water is 1:13:2 mixing, carry out ball milling, obtain expecting that by granularity be 400-600nm, slurry is dehydrated, expected Moisture control is starched in 30-35%, the pH value for controlling the slurry after dehydration is 7.2-7.4；
（4）Suppress green compact：It is permeability magnetic material 45# steel to suppress core bar and parallels in grinding tool, and remaining part is nonmagnetic steel, compacting pressure Power is 16MPa, and the kinetic potential that magnetizes is 4-5 Wan An circle, while being superimposed the pulsed magnetic field that the degree of orientation is 94-96%, pulsed magnetic field magnetomotive force For 6-7 Wan An circle；
（5）Sintering：Green compact obtained by above-mentioned compacting are put into stove and sintered at a temperature of 1150-1180 DEG C, sintering time is 2- 2.5 hours, fltting speed be 24-28min/ plates, after the completion of be ground to required size, get product.
Specific discussion to the above, the step（3）Middle ball includes a diameter of 12 steel ball 20%, a diameter of 8 steel The steel ball 40% of ball 40%, a diameter of 5.5-6.
It is preferred that, the step（3）PH value control after middle slurry dewatering is 7.2；The step（4）In the kinetic potential that magnetizes be 5 Wan An circles, while being superimposed the pulsed magnetic field that the degree of orientation is 95%, pulsed magnetic field magnetomotive force is 6 Wan An circles.
The present invention has advantages below compared with prior art：By being dry grinded to raw material and stone mill ball twice in the present invention Mill, changes crystal microstructure, it is to avoid the agglomeration of particle, increases the density of material, the degree of orientation of product is improved, in this base The fraction defective in residual magnetic flux density, reduction magnetic shoe preparation process, green density can be improved by increasing electroceramics fiber on plinth More than 3.5g/cm3, the density after magnetic shoe sintering reaches more than 5.2g/cm3, improves its mechanical performance, at ambient temperature, interior Report coercivity and reach more than 380kA/m, the high magnetic characteristics of permanent-magnet ferrite, properties of product needed for ensure that direct current variable frequency motor Stability it is good, meet stability requirement of the maintenance direct current generator to required magnetic shoe.
Embodiment
Embodiment 1
A kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor, including following process：
（1）Raw material prepares：By weight, 86 parts of Fe2O3, 3 parts of BaCO3, 5 parts of SrSO4, 2 parts of NiO, 1 part of Sc2O3, 0.6 part Y2O3, 0.5 part of In2O3, 0.5 part of γ-Ga2O3, 0.4 part of WO3, 0.3 part of electroceramics fiber；
The electroceramics fiber is lead lanthanum zirconate titanate piezoelectric ceramic fibers, is tripartite's phase perovskite structure, wherein cylindrical fibre A diameter of 250 μm, tensile strength is 25.28MPa；The length of side of square column fiber type is 300 μm, and tensile strength is 24.35MPa；
（2）Ball mill mixing：Electroceramics fiber, γ-Ga2O3 and Y will be removed in above-mentioned raw materials2O3Outer other raw materials mixing, Raw material is mixed 3 hours by rotary blade for 600 revs/min with rotating speed with strong mixed machine, discharging particle diameter is less than 40 μm；
（3）Secondary ball milling batch mixing：Raw material after ball milling is added into surplus stock, and adds water and makees dispersant, control material： Ball：The weight ratio of water is 1:13:2 mixing, carry out ball milling, obtain expecting that by granularity be 400-600nm, slurry is dehydrated, expected Moisture control is starched 32%, the pH value for controlling the slurry after dehydration is 7.2；
Wherein, ball milling ball includes the steel ball of a diameter of 12 steel ball 20%, a diameter of 8 steel ball 40%, a diameter of 5.5-6 40%；
（4）Suppress green compact：It is permeability magnetic material 45# steel to suppress core bar and parallels in grinding tool, and remaining part is nonmagnetic steel, compacting pressure Power is 16MPa, and the kinetic potential that magnetizes is 5 Wan An circles, while being superimposed the pulsed magnetic field that the degree of orientation is 95%, pulsed magnetic field magnetomotive force is 60,000 Ampere-turn；
（5）Sintering：Green compact obtained by above-mentioned compacting are put into stove and sintered at a temperature of 1150 DEG C, sintering time is 2 hours, is pushed away Enter speed for 28min/ plates, after the completion of be ground to required size, get product；
（6）Performance detection：Residual magnetic flux density Br reaches that 436Mt, coercivity H b reach 316kA8m, HCJ Hcj Reach 386kA/m, maximum magnetic energy（BH）Max reaches the density after 34.2kJ/m3, green density 3.62g/cm3, magnetic shoe sintering 5.24g/cm3 is reached, it is 3.7% to prepare fraction defective.
Embodiment 2
A kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor, including following process：
（1）Raw material prepares：By weight, 88 parts of Fe2O3, 3 parts of BaCO3, 6 parts of SrSO4, 1 part of NiO, 1 part of Sc2O3, 0.2 part Y2O3, 0.7 part of In2O3, 0.2 part of γ-Ga2O3, 0.5 part of WO3, 0.1 part of electroceramics fiber；
The electroceramics fiber is lead lanthanum zirconate titanate piezoelectric ceramic fibers, is tripartite's phase perovskite structure, wherein cylindrical fibre A diameter of 250 μm, tensile strength is 25.28MPa；The length of side of square column fiber type is 300 μm, and tensile strength is 24.35MPa；
（2）Ball mill mixing：Electroceramics fiber, γ-Ga2O3 and Y will be removed in above-mentioned raw materials2O3Outer other raw materials mixing, With strong mixed machine with 500 revs/min of rotating speed by rotary blade by raw material mixing 3-3.5 hour, the particle diameter that discharges is less than 40 μm；
（3）Secondary ball milling batch mixing：Raw material after ball milling is added into surplus stock, and adds water and makees dispersant, control material： Ball：The weight ratio of water is 1:13:2 mixing, carry out ball milling, obtain expecting that by granularity be 400-600nm, slurry is dehydrated, expected Moisture control is starched in 30-35%, the pH value for controlling the slurry after dehydration is 7.3；
Wherein, ball milling ball includes the steel ball of a diameter of 12 steel ball 20%, a diameter of 8 steel ball 40%, a diameter of 5.5-6 40%；
（4）Suppress green compact：It is permeability magnetic material 45# steel to suppress core bar and parallels in grinding tool, and remaining part is nonmagnetic steel, compacting pressure Power is 16MPa, and the kinetic potential that magnetizes is 4.5 Wan An circles, while being superimposed the pulsed magnetic field that the degree of orientation is 94-96%, pulsed magnetic field magnetomotive force For 6.5 Wan An circles；
（5）Sintering：Green compact obtained by above-mentioned compacting are put into stove and sintered at a temperature of 1150-1180 DEG C, sintering time is 2.5 Hour, fltting speed be 28min/ plates, after the completion of be ground to required size, get product；
（6）Performance detection：Residual magnetic flux density Br reaches that 435Mt, coercivity H b reach 315kA8m, HCJ Hcj Reach 382kA/m, maximum magnetic energy（BH）Max reaches the density after 33.5kJ/m3, green density 3.62g/cm3, magnetic shoe sintering 5.24g/cm3 is reached, it is 2.8% to prepare fraction defective.
Embodiment 3
A kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor, including following process：
（1）Raw material prepares：By weight, 85 parts of Fe2O3, 4 parts of BaCO3, 5 parts of SrSO4, 1 part of NiO, 2 parts of Sc2O3, 0.3 part Y2O3, 0.7 part of In2O3, 0.2 part of γ-Ga2O3, 0.5 part of WO3, 0.5 part of electroceramics fiber；
The electroceramics fiber is lead lanthanum zirconate titanate piezoelectric ceramic fibers, is tripartite's phase perovskite structure, wherein cylindrical fibre A diameter of 250 μm, tensile strength is 25.28MPa；The length of side of square column fiber type is 300 μm, and tensile strength is 24.35MPa；
（2）Ball mill mixing：Electroceramics fiber, γ-Ga2O3 and Y will be removed in above-mentioned raw materials2O3Outer other raw materials mixing, Raw material is mixed 3.5 hours by rotary blade for 600 revs/min with rotating speed with strong mixed machine, discharging particle diameter is less than 40 μm；
（3）Secondary ball milling batch mixing：Raw material after ball milling is added into surplus stock, and adds water and makees dispersant, control material： Ball：The weight ratio of water is 1:13:2 mixing, carry out ball milling, obtain expecting that by granularity be 400-600nm, slurry is dehydrated, expected Moisture control is starched in 30-35%, the pH value for controlling the slurry after dehydration is 7.4；
Wherein, ball milling ball includes the steel ball of a diameter of 12 steel ball 20%, a diameter of 8 steel ball 40%, a diameter of 5.5-6 40%；
（4）Suppress green compact：It is permeability magnetic material 45# steel to suppress core bar and parallels in grinding tool, and remaining part is nonmagnetic steel, compacting pressure Power is 16MPa, and the kinetic potential that magnetizes is 4 Wan An circles, while being superimposed the pulsed magnetic field that the degree of orientation is 94-96%, pulsed magnetic field magnetomotive force is 7 Wan An circles；
（5）Sintering：Green compact obtained by above-mentioned compacting are put into stove and sintered at a temperature of 1180 DEG C, sintering time is that 2-2.5 is small When, fltting speed be 25min/ plates, after the completion of be ground to required size, get product；
（6）Performance detection：Residual magnetic flux density Br reaches that 437Mt, coercivity H b reach 313kA8m, HCJ Hcj Reach 384kA/m, maximum magnetic energy（BH）Max reaches the density after 32.7kJ/m3, green density 3.61g/cm3, magnetic shoe sintering 5.23g/cm3 is reached, it is 3.3% to prepare fraction defective.
Control group 1
To saving step in embodiment 1（2）, all raw materials are directly pressed into step（3）Middle method ball milling, remaining step is identical, property Can detection：Residual magnetic flux density Br reaches that 425Mt, coercivity H b reach that 298kA8m, HCJ Hcj reach 342kA/ M, maximum magnetic energy（BH）Max reaches that the density after 31.2kJ/m3, green density 3.16g/cm3, magnetic shoe sintering reaches 4.78g/ Cm3, it is 18.2% to prepare fraction defective；
Reduced compared to combination property in embodiment 1, prepare fraction defective raising, be not suitable for processing in the present invention.
Control group 2
The Fe of quality such as replace with to electroceramics fiber in embodiment 12O3, remaining step is identical, performance detection：Residual magnetic induction Intensity Br reaches that 415Mt, coercivity H b reach that 302kA8m, HCJ Hcj reach 354kA/m, maximum magnetic energy（BH） Max reaches that the density after 30.3kJ/m3, green density 3.43g/cm3, magnetic shoe sintering reaches 5.07g/cm3, and preparing fraction defective is 12.5%；
Compared with Example 1, residual magnetic flux density receives considerable influence, accordingly, the reduction of product quality stability, comprehensive Impaired performance.
Control group 3
It is pure tripartite's phase perovskite structure to electroceramics fiber in embodiment 1, remaining step is identical, performance detection：Residual magnetic induction Intensity Br is answered to reach that 428Mt, coercivity H b reach that 304kA8m, HCJ Hcj reach 337kA/m, maximum magnetic energy （BH）Max reaches that the density after 32.4kJ/m3, green density 3.47g/cm3, magnetic shoe sintering reaches 5.02g/cm3, prepares bad Rate is 8.6%.
Control group 4
It is Tetragonal perovskite structure to electroceramics fiber in embodiment 1, remaining step is identical, performance detection：Residual magnetic induction Intensity Br reaches that 422Mt, coercivity H b reach that 316kA8m, HCJ Hcj reach 342kA/m, maximum magnetic energy（BH） Max reaches that the density after 32.9kJ/m3, green density 3.51g/cm3, magnetic shoe sintering reaches 5.02g/cm3, and preparing fraction defective is 7.4%
Selection in control group 3 and control group 4 to electroceramics fiber, has increasing to influence, it is impossible to meet direct current on HCJ Requirement of the motor to magnet.

Claims (4)

1. a kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor, it is characterised in that including following work Sequence：
（1）Raw material prepares：By weight, 85-88 parts of Fe2O3, 3-4 parts of BaCO3, 4-6 parts of SrSO4, 1-2 parts NiO, 1-2 parts Sc2O3, 0.2-0.8 parts of Y2O3, 0.3-0.7 parts of In2O3, 0.2-0.8 parts of γ-Ga2O3, 0.1-0.5 parts of WO3, 0.1-0.5 parts electricity pottery Porcelain fiber；
The electroceramics fiber is lead lanthanum zirconate titanate piezoelectric ceramic fibers, is tripartite's phase perovskite structure, wherein cylindrical fibre A diameter of 250 μm, tensile strength is 25.28MPa；The length of side of square column fiber type is 300 μm, and tensile strength is 24.35MPa；
（2）Ball mill mixing：Electroceramics fiber, γ-Ga2O3 and Y will be removed in above-mentioned raw materials2O3Outer other raw materials mixing, is used By force mixed machine with 400-600 revs/min of rotating speed by rotary blade by raw material mixing 3-3.5 hour, the particle diameter that discharges is less than 40 μm；
（3）Secondary ball milling batch mixing：Raw material after ball milling is added into surplus stock, and adds water and makees dispersant, control material： Ball：The weight ratio of water is 1:13:2 mixing, carry out ball milling, obtain expecting that by granularity be 400-600nm, slurry is dehydrated, expected Moisture control is starched in 30-35%, the pH value for controlling the slurry after dehydration is 7.2-7.4；
（4）Suppress green compact：It is permeability magnetic material 45# steel to suppress core bar and parallels in grinding tool, and remaining part is nonmagnetic steel, compacting pressure Power is 16MPa, and the kinetic potential that magnetizes is 4-5 Wan An circle, while being superimposed the pulsed magnetic field that the degree of orientation is 94-96%, pulsed magnetic field magnetomotive force For 6-7 Wan An circle；
（5）Sintering：Green compact obtained by above-mentioned compacting are put into stove and sintered at a temperature of 1150-1180 DEG C, sintering time is 2- 2.5 hours, fltting speed be 24-28min/ plates, after the completion of be ground to required size, get product.
2. a kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor as claimed in claim 1, its feature It is, the step（3）Middle ball includes a diameter of 12 steel ball 20%, a diameter of 8 steel ball 40%, a diameter of 5.5-6 steel ball 40%。
3. a kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor as claimed in claim 1, its feature It is, the step（3）PH value control after middle slurry dewatering is 7.2.
4. a kind of manufacture method of high-performance micro permanent ferrite magnetic shoe for DC electric motor as claimed in claim 1, its feature It is, the step（4）In magnetize kinetic potential for 5 Wan An circles, while being superimposed the pulsed magnetic field that the degree of orientation is 95%, pulsed magnetic field magnetic Kinetic potential is 6 Wan An circles.
CN201710348867.XA 2017-05-17 2017-05-17 Method for manufacturing permanent magnetic ferrite magnetic shoe for high-performance miniature direct current motor Expired - Fee Related CN107162578B (en)

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CN110372362A (en) * 2019-07-15 2019-10-25 横店集团东磁股份有限公司 A kind of preparation method and permanent-magnet ferrite material of permanent-magnet ferrite material

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JPS6189606A (en) * 1984-10-09 1986-05-07 Ricoh Co Ltd Metal oxide magnetic substance and magnetic film
CN101022052A (en) * 2006-11-21 2007-08-22 陈赟 Permanent magnet oxysome magnetic shoe and producing method thereof
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110372362A (en) * 2019-07-15 2019-10-25 横店集团东磁股份有限公司 A kind of preparation method and permanent-magnet ferrite material of permanent-magnet ferrite material

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