CN107954707A - A kind of preparation method of the magnetic binding material with high heat conduction - Google Patents
A kind of preparation method of the magnetic binding material with high heat conduction Download PDFInfo
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- CN107954707A CN107954707A CN201711330131.6A CN201711330131A CN107954707A CN 107954707 A CN107954707 A CN 107954707A CN 201711330131 A CN201711330131 A CN 201711330131A CN 107954707 A CN107954707 A CN 107954707A
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- 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
- C04B35/2683—Other ferrites containing alkaline earth metals or lead
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract
The invention discloses a kind of preparation method of the magnetic binding material with high heat conduction, belong to field of magnetic material preparation, implement in accordance with the following steps：Hydrogen is broken, wet-milling, drying, calendering formation, sintering and post processing.The preparation method of magnetic binding material disclosed by the invention with high heat conduction, performance compared to the magnetic material prepared using the preparation method in comparative example is more excellent, thermal conductivity at least adds 258W/ (m DEG C), remanent magnetism Br at least adds 685Gs, coercivity H b at least adds 265KA/m, intrinsic coercivity Hcj at least adds 233KA/m, maximum magnetic energy product (BH)maxAt least add 36KJ/m.
Description
Technical field
The present invention relates to field of magnetic material preparation, more particularly to a kind of magnetic binding material with high heat conduction
Preparation method.
Background technology
Magnetic material is the important foundation functional material of electronics industry, be widely used in computer, electronic device, communication,
The daily necessities such as the industrial circle such as automobile and aerospace and household electrical appliance, toy for children, with world economy and science
The fast development of technology, the demand of magnetic material will be unprecedented wide.Existing magnetic material does not have heat conduction function or thermal conductivity
Can be poor, it is impossible to meet the demand of the component of some needs high heat conductions requirement, and there are process conditions it is uncontrollable, be unsuitable for greatly
The problems such as large-scale production.
The content of the invention
The defects of in order to overcome the prior art, the invention discloses a kind of preparation of the magnetic binding material with high heat conduction
Method using process conditions are controllable, preparation process suitable for large-scale production produces, it can be achieved that a kind of have higher lead
The heat conduction magnetism binding material of hot property.
For this purpose, the present invention uses following technical scheme：
The present invention provides a kind of preparation method of the magnetic binding material with high heat conduction, implement in accordance with the following steps：
1) hydrogen is broken：
By the anisotropy strontium ferrum magnetic powder, the thermal conducting agent that mass fraction is 8~15 parts, matter that mass fraction is 80~120 parts
Amount number is 5~10 parts of antioxidants and binding agent that mass fraction is 3~8 parts is placed in the broken machine of hydrogen that to carry out hydrogen broken, obtains hydrogen
Broken material.
2) wet-milling：
The broken material of the hydrogen is transferred in ball mill, and thereto add mass fraction be 1~5 part lubricant and
The dispersant of the broken quality of materials 20%~30% of the hydrogen is accounted for, the mixture is subjected to wet-milling, obtains wet-milled slurry.
The wet-milling is carried out according to following two stages：The pre-grinding stage, during the ball mill wet-milling rotating speed for 10~
20r/min, wet-milling time are 0.5h；In the wet-milling stage, rotating speed is 150~200r/min during the ball mill wet-milling, wet-milling
Time is 1.5~3h.
3) it is dry：
The wet-milled slurry is transferred in steam drying cabinet and is dried, dry maximum temperature is 180 DEG C, drying time
3~8h, obtains drying material.
4) calendering formation：
The drying material fast transfer is pressed into steel die using molding press, obtains moulding material.
5) sinter：
The moulding material is placed in sintering furnace and is sintered and cools down, obtains sintering coolant；
The sintering cooling is carried out according to following seven stages：
First stage：Initial temperature is room temperature, constant temperature after being warming up to 280~350 DEG C with the frequency of 3~5 DEG C/min, constant temperature
Time is no less than 0.5h；
Second stage：Constant temperature after being warming up to 700~880 DEG C with the frequency of 6~8 DEG C/min, constant temperature time are no less than 1h；
Phase III：Constant temperature after being warming up to 1150~1250 DEG C with the frequency of 9~12 DEG C/min, constant temperature time are no less than
1h；
Fourth stage：Constant temperature after being warming up to 1400~1500 DEG C with the frequency of 6~8 DEG C/min, constant temperature time are no less than 2h；
5th stage：Constant temperature after being cooled to 1200~1250 DEG C with the frequency of 3~5 DEG C/min, constant temperature time are no less than 2h；
6th stage：Constant temperature after being cooled to 580~630 DEG C with the frequency of 6~8 DEG C/min, constant temperature time are no less than 1h；
7th stage：Less than 60 DEG C are cooled to the frequency of 9~12 DEG C/min.
6) post-process：
By the sintering coolant respectively by eliminating thermal stress, surface volatile matter, water cleaning, heated-air drying processing,
Obtain magnetic binding material.
In preferably technical solution of the invention, the broken material average particle size range of hydrogen is 2.0~2.5 μm.
In preferably technical solution of the invention, the thermal conducting agent is copper powder or carborundum.
In preferably technical solution of the invention, the antioxidant is glycerine.
In preferably technical solution of the invention, the binding agent is nylon resin.
In preferably technical solution of the invention, the lubricant is polydimethylsilane.
In preferably technical solution of the invention, the dispersant is more than 95% methanol or ethanol for mass fraction.
In preferably technical solution of the invention, dispersant is added during the wet-milling into ball mill in three times, three
Secondary addition is equal, is added for the first time before the pre-grinding stage, is added for the second time after the pre-grinding stage, for the third time wet
The mill stage adds after carrying out 1h.
In preferably technical solution of the invention, the average grain diameter of the wet-milled slurry is 1.4~1.6 μm.
In preferably technical solution of the invention, in the drying steps, it is dried according to following two stages：
Dispersant recovery stage：For the wet-milled slurry in steam pressure 0.05MPa~0.08MPa, temperature is 80~120 DEG C
Under the conditions of 1.5~4.5h of freeze-day with constant temperature；
Powder drying stage：Forming agent gasoline is added in by the sieving mixture of the dispersant recovery stage
Solution after mixing, in steam pressure 0.02MPa~0.04MPa, freeze-day with constant temperature 1.5 under the conditions of temperature is 150~180 DEG C~
3.5h。
Beneficial effects of the present invention are：
The preparation method of magnetic binding material provided by the invention with high heat conduction, uses 7 segmentations in sintering process
Heating, insulation and cooling, can produce more excellent performance of magnetic binding material, compared to using in comparative example
The performance for the magnetic material that preparation method prepares is more excellent, and thermal conductivity at least adds 258W/ (m DEG C), and remanent magnetism Br is minimum
685Gs is added, coercivity H b at least adds 265KA/m, and intrinsic coercivity Hcj at least adds 233KA/m, maximum magnetic flux
Energy product (BH)maxAt least add 36KJ/m.
Embodiment
Technical scheme is further illustrated with reference to embodiment.
Embodiment one
The preparation method of magnetic binding material provided in this embodiment with high heat conduction, implements in accordance with the following steps：
1) hydrogen is broken：
By the anisotropy strontium ferrum magnetic powder, the thermal conducting agent copper powder that mass fraction is 8 parts, mass fraction that mass fraction is 80 parts
It is placed in for 5 parts of antioxidant glycerine and binding agent nylon resin nylon 610 that mass fraction is 3 parts in the broken machine of hydrogen and carries out hydrogen
It is broken, obtain the broken material of hydrogen；The broken material average particle size range of hydrogen is 2.0~2.5 μm.
2) wet-milling：
The broken material of the hydrogen is transferred in ball mill, and adds the poly- diformazan of lubricant that mass fraction is 1 part thereto
Silane and the dispersant mass fraction for accounting for the broken quality of materials 20% of the hydrogen are 98% methanol, the mixture are carried out wet
Mill, obtains wet-milled slurry.
The wet-milling is carried out according to following two stages：In the pre-grinding stage, rotating speed is 10r/ during the ball mill wet-milling
Min, wet-milling time are 0.5h；In the wet-milling stage, rotating speed is 150r/min during the ball mill wet-milling, and the wet-milling time is
1.5h；The average grain diameter of the wet-milled slurry is 1.4~1.6 μm.
3) it is dry：
The wet-milled slurry is transferred in steam drying cabinet and is dried, dry maximum temperature is 180 DEG C, drying time
3h, obtains drying material.
4) calendering formation：
The drying material fast transfer is pressed into steel die using molding press, obtains moulding material.
5) sinter：
The moulding material is placed in sintering furnace and is sintered and cools down, obtains sintering coolant；
The sintering cooling is carried out according to following seven stages：
First stage：Initial temperature is room temperature, constant temperature after being warming up to 280 DEG C with the frequency of 3 DEG C/min, constant temperature 0.5h；
Second stage：Constant temperature after being warming up to 700 DEG C with the frequency of 6 DEG C/min, constant temperature 1h；
Phase III：Constant temperature after being warming up to 1150 DEG C with the frequency of 9 DEG C/min, constant temperature 1h；
Fourth stage：Constant temperature after being warming up to 1400 DEG C with the frequency of 6 DEG C/min, constant temperature 2h；
5th stage：Constant temperature after being cooled to 1200 DEG C with the frequency of 3 DEG C/min, constant temperature 2h；
6th stage：Constant temperature after being cooled to 580 DEG C with the frequency of 6 DEG C/min, constant temperature 1h；
7th stage：Less than 60 DEG C are cooled to the frequency of 9 DEG C/min, 58.9 DEG C of observed temperature.
6) post-process：
By the sintering coolant respectively by eliminating thermal stress, surface volatile matter, water cleaning, heated-air drying processing,
Obtain magnetic binding material.The elimination thermal stress uses heat treatment method or ultrasonication, and the surface volatile matter makes
The removal of surface volatile matter is carried out with sand-blasting machine, water cleans the impurity on magnetic material surface capable of washing, and heated-air drying processing is most
High-temperature is 60 DEG C, generally dry 30s.
Embodiment two
The preparation method of magnetic binding material provided in this embodiment with high heat conduction, implements in accordance with the following steps：
1) hydrogen is broken：
By the anisotropy strontium ferrum magnetic powder, the thermal conducting agent carborundum that mass fraction is 12 parts, quality that mass fraction is 100 parts
The binding agent nylon resin nylon66 fiber that number is 8 parts of antioxidant glycerine and mass fraction is 5 parts be placed in the broken machine of hydrogen into
Row hydrogen is broken, obtains the broken material of hydrogen；The broken material average particle size range of hydrogen is 2.0~2.5 μm.
2) wet-milling：
The broken material of the hydrogen is transferred in ball mill, and adds the poly- diformazan of lubricant that mass fraction is 3 parts thereto
Silane and the dispersant mass fraction for accounting for the broken quality of materials 25% of the hydrogen are 98% ethanol, the mixture are carried out wet
Mill, obtains wet-milled slurry；
The wet-milling is carried out according to following two stages：In the pre-grinding stage, rotating speed is 15r/ during the ball mill wet-milling
Min, wet-milling time are 0.5h；In the wet-milling stage, rotating speed is 180r/min during the ball mill wet-milling, and the wet-milling time is 2h；
The average grain diameter of the wet-milled slurry is 1.4~1.6 μm.
Add dispersant during the wet-milling into ball mill in three times, addition is equal three times, for the first time described
Pre-grinding added before the stage, was added for the second time after the pre-grinding stage, was added after carrying out 1h in the wet-milling stage for the third time.
3) it is dry：
The wet-milled slurry is transferred in steam drying cabinet and is dried, dry maximum temperature is 180 DEG C, drying time
5h, obtains drying material；
4) calendering formation：
The drying material fast transfer is pressed into steel die using molding press, obtains moulding material；
5) sinter：
The moulding material is placed in sintering furnace and is sintered and cools down, obtains sintering coolant；
The sintering cooling is carried out according to following seven stages：
First stage：Initial temperature is room temperature, constant temperature after being warming up to 300 DEG C with the frequency of 4 DEG C/min, constant temperature 45min；
Second stage：Constant temperature after being warming up to 780 DEG C with the frequency of 7 DEG C/min, constant temperature 1.5h；
Phase III：Constant temperature after being warming up to 1200 DEG C with the frequency of 10 DEG C/min, constant temperature 1h；
Fourth stage：Constant temperature after being warming up to 1450 DEG C with the frequency of 7 DEG C/min, constant temperature time are no less than 2h；
5th stage：Constant temperature after being cooled to 1200~1250 DEG C with the frequency of 4 DEG C/min, constant temperature time are no less than 2h.
6th stage：Constant temperature after being cooled to 580~630 DEG C with the frequency of 7 DEG C/min, constant temperature time are no less than 1h；
7th stage：Less than 60 DEG C are cooled to the frequency of 10 DEG C/min, observed temperature is 57.6 DEG C；
6) post-process：
By the sintering coolant respectively by eliminating thermal stress, surface volatile matter, water cleaning, heated-air drying processing,
Obtain magnetic binding material.
Embodiment three
The preparation method of magnetic binding material provided in this embodiment with high heat conduction, implements in accordance with the following steps：
1) hydrogen is broken：
By the anisotropy strontium ferrum magnetic powder, the thermal conducting agent copper powder that mass fraction is 15 parts, mass parts that mass fraction is 120 parts
The binding agent nylon resin nylon 6 that number is 10 parts of antioxidant ethylene glycol and mass fraction is 8 parts, which is placed in the broken machine of hydrogen, to carry out
Hydrogen is broken, obtains the broken material of hydrogen；
2) wet-milling：
The broken material of the hydrogen is transferred in ball mill, and adds the lubricant poly- two that mass fraction is 1~5 part thereto
Monosilane and the dispersant methanol (mass fraction 98%) for accounting for the broken quality of materials 30% of the hydrogen, the mixture are carried out wet
Mill, obtains wet-milled slurry；
The wet-milling is carried out according to following two stages：In the pre-grinding stage, rotating speed is 20r/ during the ball mill wet-milling
Min, wet-milling time are 0.5h；In the wet-milling stage, rotating speed is 200r/min during the ball mill wet-milling, and the wet-milling time is 3h；
3) it is dry：
The wet-milled slurry is transferred in steam drying cabinet and is dried, obtains drying material；
In the drying steps, it is dried according to following two stages：
Dispersant recovery stage：For the wet-milled slurry in steam pressure 0.05MPa, temperature is freeze-day with constant temperature under the conditions of 80 DEG C
1.5h；
Powder drying stage：Forming agent gasoline is added in by the sieving mixture of the dispersant recovery stage
After mixing, in steam pressure 0.02MPa, temperature is freeze-day with constant temperature 1.5h under the conditions of 150 to solution.
4) calendering formation：
The drying material fast transfer is pressed into steel die using molding press, obtains moulding material；
5) sinter：
The moulding material is placed in sintering furnace and is sintered and cools down, obtains sintering coolant；
The sintering cooling is carried out according to following seven stages：
First stage：Initial temperature is room temperature, constant temperature after being warming up to 350 DEG C with the frequency of 5 DEG C/min, constant temperature 0.5h；
Second stage：Constant temperature after being warming up to 880 DEG C with the frequency of 8 DEG C/min, constant temperature 1h；
Phase III：Constant temperature after being warming up to 1250 DEG C with the frequency of 12 DEG C/min, constant temperature 1h；
Fourth stage：Constant temperature after being warming up to 1500 DEG C with the frequency of 8 DEG C/min, constant temperature 2h；
5th stage：Constant temperature after being cooled to 1250 DEG C with the frequency of 5 DEG C/min, constant temperature 2h；
6th stage：Constant temperature after being cooled to 630 DEG C with the frequency of 8 DEG C/min, constant temperature 1h；
7th stage：Less than 60 DEG C are cooled to the frequency of 12 DEG C/min, 58.6 DEG C of observed temperature；
6) post-process：
By the sintering coolant respectively by eliminating thermal stress, surface volatile matter, water cleaning, heated-air drying processing,
Obtain magnetic binding material.
Comparative example：The preparation method of magnetic binding material provided in this embodiment with high heat conduction, according to as follows
Step is implemented：
1) hydrogen is broken：
By the anisotropy strontium ferrum magnetic powder, the thermal conducting agent copper powder that mass fraction is 8 parts, mass fraction that mass fraction is 80 parts
It is placed in for 5 parts of antioxidant glycerine and binding agent nylon resin nylon 610 that mass fraction is 3 parts in the broken machine of hydrogen and carries out hydrogen
It is broken, obtain the broken material of hydrogen；The broken material average particle size range of hydrogen is 2.0~2.5 μm.
2) wet-milling：
The broken material of the hydrogen is transferred in ball mill, and adds the poly- diformazan of lubricant that mass fraction is 1 part thereto
Silane and the dispersant mass fraction for accounting for the broken quality of materials 20% of the hydrogen are 98% methanol, the mixture are carried out wet
Mill, obtains wet-milled slurry.
3) it is dry：
The wet-milled slurry is transferred in steam drying cabinet and is dried, dry maximum temperature is 180 DEG C, drying time
3h, obtains drying material.
4) calendering formation：
The drying material fast transfer is pressed into steel die using molding press, obtains moulding material.
5) sinter：
The moulding material is placed in sintering furnace and is sintered, sintering initial temperature is room temperature, with the frequency of 10 DEG C/min
Constant temperature after rate is warming up to 1400 DEG C, constant temperature 5h, obtains agglomerated material.
6) post-process：
By the agglomerated material respectively by eliminating thermal stress, surface volatile matter, water cleaning, heated-air drying processing, obtain
Magnetic binding material.
Conducting magnetic material made from Example one to three and comparative example is tested for the property respectively, test event
Thermal conductivity including these materials, remanent magnetism Br, coercivity H b, intrinsic coercivity Hcj and maximum magnetic energy product (BH)max.Specific examination
Test result such as following table：
Thermal conductivity tests out its thermal conductivity factor, then calculates according to test national standard GB/T 10294-2008 in upper table
Go out, remanent magnetism Br, coercivity H b, intrinsic coercivity Hcj and maximum magnetic energy product (BH)maxTest method use GB/T
3217-2013 is tested.
As can be seen from the table, the heat conduction magnetism binding material prepared using the preparation method in the present invention is relatively used
The performance for the magnetic material that preparation method in comparative example prepares is more excellent, and thermal conductivity at least adds 258W/ (m
DEG C), remanent magnetism Br at least adds 685Gs, and coercivity H b at least adds 265KA/m, and intrinsic coercivity Hcj is at least added
233KA/m, maximum magnetic energy product (BH)maxAt least add 36KJ/m.
The present invention is described with reference to the preferred embodiments, and those skilled in the art know, is not departing from the present invention's
In the case of spirit and scope, various changes or equivalence replacement can be carried out to these features and embodiment.The present invention is from this
The limitation of specific embodiment disclosed in place, other embodiments fallen into claims hereof belong to protection of the present invention
Scope.
Claims (10)
1. a kind of preparation method of the magnetic binding material with high heat conduction, it is characterised in that implement in accordance with the following steps：
1) hydrogen is broken：
By the anisotropy strontium ferrum magnetic powder, the thermal conducting agent that mass fraction is 8~15 parts, mass parts that mass fraction is 80~120 parts
Number is placed in the broken machine of hydrogen that to carry out hydrogen broken for 5~10 parts of antioxidants and binding agent that mass fraction is 3~8 parts, obtains the broken material of hydrogen
Material；
2) wet-milling：
The broken material of the hydrogen is transferred in ball mill, and thereto add mass fraction for 1~5 part lubricant and account for institute
The dispersant of the broken quality of materials 20%~30% of hydrogen is stated, the mixture is subjected to wet-milling, obtains wet-milled slurry；
The wet-milling is carried out according to following two stages：In the pre-grinding stage, rotating speed is 10~20r/ during the ball mill wet-milling
Min, wet-milling time are 0.5h；In the wet-milling stage, rotating speed is 150~200r/min during the ball mill wet-milling, the wet-milling time
For 1.5~3h；
3) it is dry：
The wet-milled slurry is transferred in steam drying cabinet and is dried, dry maximum temperature is 180 DEG C, drying time 3~
8h, obtains drying material；
4) calendering formation：
The drying material fast transfer is pressed into steel die using molding press, obtains moulding material；
5) sintering cooling：
The moulding material is placed in sintering furnace and is sintered and cools down, obtains sintering coolant；
The sintering cooling is carried out according to following seven stages：
First stage：Initial temperature is room temperature, constant temperature after being warming up to 280~350 DEG C with the frequency of 3~5 DEG C/min, constant temperature time
No less than 0.5h；
Second stage：Constant temperature after being warming up to 700~880 DEG C with the frequency of 6~8 DEG C/min, constant temperature time are no less than 1h；
Phase III：Constant temperature after being warming up to 1150~1250 DEG C with the frequency of 9~12 DEG C/min, constant temperature time are no less than 1h；
Fourth stage：Constant temperature after being warming up to 1400~1500 DEG C with the frequency of 6~8 DEG C/min, constant temperature time are no less than 2h；
5th stage：Constant temperature after being cooled to 1200~1250 DEG C with the frequency of 3~5 DEG C/min, constant temperature time are no less than 2h；
6th stage：Constant temperature after being cooled to 580~630 DEG C with the frequency of 6~8 DEG C/min, constant temperature time are no less than 1h；
7th stage：Less than 60 DEG C are cooled to the frequency of 9~12 DEG C/min；
6) post-process：
By the sintering coolant respectively by eliminating thermal stress, surface volatile matter, water cleaning, heated-air drying processing, obtain
Magnetic binding material.
2. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
The broken material average particle size range of hydrogen is 2.0~2.5 μm.
3. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
The thermal conducting agent is copper powder or carborundum.
4. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
The antioxidant is glycerine.
5. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
The binding agent is nylon resin.
6. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
The lubricant is polydimethylsilane.
7. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
The dispersant is more than 95% methanol or ethanol for mass fraction.
8. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that the wet-milling
Add dispersant in journey into ball mill in three times, addition is equal three times, is added for the first time before the pre-grinding stage, second
It is secondary to be added after the pre-grinding stage, added after carrying out 1h in the wet-milling stage for the third time.
9. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
The average grain diameter of the wet-milled slurry is 1.4~1.6 μm.
10. the preparation method of the magnetic binding material of high heat conduction according to claim 1, it is characterised in that：
In the drying steps, it is dried according to following two stages：
Dispersant recovery stage：For the wet-milled slurry in steam pressure 0.05MPa~0.08MPa, temperature is 80~120 DEG C of conditions
1.5~4.5h of lower freeze-day with constant temperature；
Powder drying stage：Forming agent gasoline solution is added in by the sieving mixture of the dispersant recovery stage
After mixing, in steam pressure 0.02MPa~0.04MPa, freeze-day with constant temperature 1.5 under the conditions of temperature is 150~180 DEG C~
3.5h。
Priority Applications (1)
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| CN1956109A (en) * | 2005-10-25 | 2007-05-02 | 四川大学 | Binding samarium-iron-nitrogen, neodymium-iron-nitrogen, ferrite permanent-magnet powder compound permanent-magnet material and its preparation method |
| CN103265277A (en) * | 2013-06-14 | 2013-08-28 | 南通飞来福磁铁有限公司 | Preparation method of permanent magnetic ferrite |
| CN104194325A (en) * | 2014-09-17 | 2014-12-10 | 中山大学 | Preparing method of heat-conductive and injection-molded magnetic composite |
| CN107385304A (en) * | 2017-07-29 | 2017-11-24 | 赣州伟嘉合金有限责任公司 | A kind of hard alloy and its manufacture method |
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| JP2927987B2 (en) * | 1991-05-20 | 1999-07-28 | 住友特殊金属株式会社 | Manufacturing method of permanent magnet powder |
| CN1664964A (en) * | 2005-03-17 | 2005-09-07 | 华南理工大学 | Process for clinkering anisotropic permanent ferrite through polymer bonding and modeling |
| CN1956109A (en) * | 2005-10-25 | 2007-05-02 | 四川大学 | Binding samarium-iron-nitrogen, neodymium-iron-nitrogen, ferrite permanent-magnet powder compound permanent-magnet material and its preparation method |
| CN103265277A (en) * | 2013-06-14 | 2013-08-28 | 南通飞来福磁铁有限公司 | Preparation method of permanent magnetic ferrite |
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