CN104249155B - The flattening method of magnetic metallic powder - Google Patents
The flattening method of magnetic metallic powder Download PDFInfo
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- CN104249155B CN104249155B CN201310260957.5A CN201310260957A CN104249155B CN 104249155 B CN104249155 B CN 104249155B CN 201310260957 A CN201310260957 A CN 201310260957A CN 104249155 B CN104249155 B CN 104249155B
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- 239000000843 powder Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000000498 ball milling Methods 0.000 claims abstract description 51
- 239000004576 sand Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 239000013528 metallic particle Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Powder Metallurgy (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention discloses a kind of flattening method of magnetic metallic powder, the method uses ball mill device that magnetic metallic powder carries out at least two-stage ball milling successively so that it is flattening；And the rotating speed of ball mill device reduces step by step, the size that mill is situated between increases step by step, thus be conducive to improving the flat rate of magnetic metallic powder, empirical tests, the final flat rate of the magnetic metallic powder prepared by the method can reach the ratio of length/thickness between 60～100；And the method efficiency is high, makes ball milling total time shorten.
Description
Technical field
The present invention relates to soft magnetic ferrite preparing technical field, particularly relate to a kind of magnetic metallic powder
Flattening method.
Background technology
Electromagnetic interference (EMI) is that such as the electronic equipment such as computer, mobile phone is in use produced
Unwanted electromagnetic signal or the noise interference to effective electromagnetic signal.Along with various electronic equipments, television network
Becoming increasingly popular of network, programme-controlled exchange, mobile communication apparatus and office automation, electromagnetic interference becomes the most day by day
It is in order to an overall situation of people's worry is polluted, increasingly severe in the impact of military and civilian electronic information field,
To public environment and personal safety and military security, cause the biggest harm safely, and along with many has
Source network develops to miniaturization and high frequency direction, and its hazardness is increasing.Current enforceable electromagnetism is held concurrently
Appearance standard (EMC) the most worldwide performs, some developed countries EMC Design technology,
The aspects such as material technology, components and parts technology begin to research from the seventies, and form a series of standard in addition
Application.
Along with the development of electromagnetism interference technology, increasing electronic equipment begins to use metal powder sheet rubber
It is attached to circuit surface as absorbing material, thus plays suppression conduction electromagnetic noise and the work of electromagnetic radiation noise
With.And its microwave absorbing property is had a great impact by the flat rate of the metal powder filled in metal powder sheet rubber,
Result of study shows that the resonant frequency with the metal alloy sheet of high shape anisotropic property can be greatly improved, its
The width of absworption peak is the most wider.Therefore needed to use suitable technique by gold before preparing metal powder sheet rubber
Belong to powder and carry out flaky process.
Carrying out the commonly used method of flaky process is exactly ball milling.Traditional ball grinding method is: whole ball
During mill, the rotating speed of ball mill is constant, and mill Jie's size is the most constant.
The problem that above-mentioned traditional ball milling method exists is: if the rotating speed of ball mill is very slow, then can cause ball
Consume time oversize, efficiency is the lowest, and for a long time ball milling can introduce impurity, is unfavorable for improving the property of product
Energy；And if the rotating speed of ball mill is too fast, then foil is easily broken into little unqualified.Even if carrying out parameter
After optimization, reach metal powder size length and width at 40um, thickness 1～about 2um, length/thickness ratio exists
It has been the limit of single-stage ball milling between 20～40.
Therefore, it is necessary to existing ball grinding technique is improved, to improve the flat rate of metal powder.
Summary of the invention
It is an object of the invention to provide a kind of flattening method of magnetic metallic powder, to improve high metal powder
Flat rate.
For solving the problems referred to above, the present invention proposes a kind of flattening method of magnetic metallic powder, and the method is adopted
With ball mill device, magnetic metallic powder carried out successively at least two-stage ball milling so that it is flattening；Wherein, described
It is placed with mill in ball mill device to be situated between；The rotating speed of ball mill device reduces step by step, and the size that mill is situated between increases step by step.
In one embodiment of the invention, the progression of ball milling is two-stage.
It is preferred that the step of two-stage ball milling is:
Magnetic metallic powder is carried out first order ball milling, until magnetic metallic powder major part becomes round pie and thickness
Degree stops when 3～5um；Wherein, the rotating speed of ball mill device is the first rotating speed, and the size that mill is situated between is diameter
1～2mm；
Magnetic metallic powder is carried out second level ball milling, until magnetic metallic powder flakiness shape and thin slice crush
Till before；Wherein, the rotating speed of ball mill device is the second rotating speed, and the second rotating speed is less than the first rotating speed, and mill is situated between
Size be diameter 6～10mm.
It is preferred that the size of the second rotating speed is the first rotating speed 2/3rds.
It is preferred that described ball mill device is ball mill or sand mill.
It is preferred that described mill is situated between for steel ball or zirconium ball.
It is preferred that the flat rate of described magnetic metallic powder reach the ratio of length/thickness 60～100 it
Between.
Compared with prior art, the flattening method of the magnetic metallic powder that the present invention provides uses ball mill device
Magnetic metallic powder is carried out successively at least two-stage ball milling so that it is flattening；And the rotating speed of ball mill device by
Level reduces, and the size that mill is situated between increases step by step, thus is conducive to improving the flat rate of magnetic metallic powder, warp
Checking, the final flat rate of the magnetic metallic powder prepared by the method can reach length/thickness
Ratio between 60～100；And the method efficiency is high, makes ball milling total time shorten.
Accompanying drawing explanation
The flow chart of the flattening method of the magnetic metallic powder that Fig. 1 provides for one embodiment of the invention；
The flow chart of the flattening method of the magnetic metallic powder that Fig. 2 provides for another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the flattening method of the magnetic metallic powder that the present invention proposes is made
Further describe.According to following explanation and claims, advantages and features of the invention will be apparent from.
It should be noted that, accompanying drawing all uses the form simplified very much and all uses non-ratio accurately, be only used for conveniently,
Aid in illustrating the purpose of the embodiment of the present invention lucidly.
The core concept of the present invention is to provide a kind of flattening method of magnetic metallic powder, and the method uses
Ball mill device carries out at least two-stage ball milling successively to magnetic metallic powder so that it is flattening；Wherein, described ball
It is placed with mill in mill apparatus to be situated between；The rotating speed of ball mill device reduces step by step, and the size that mill is situated between increases step by step, thus
Be conducive to improving the flat rate of magnetic metallic powder, empirical tests, the magnetic gold prepared by the method
The final flat rate belonging to powder can reach the ratio of length/thickness between 60～100；And the method is imitated
Rate is high, makes ball milling total time shorten.
Embodiment 1
Refer to the stream of the flattening method of the magnetic metallic powder that Fig. 1, Fig. 1 provide for one embodiment of the invention
Cheng Tu, as it is shown in figure 1, the flattening method of the magnetic metallic powder of the present embodiment offer uses ball mill device
Magnetic metallic powder is carried out successively two-stage ball milling, specifically includes following steps:
S1, magnetic metallic powder is carried out first order ball milling, until magnetic metallic powder major part becomes round pie
And thickness stops when 3～5um；Wherein, the rotating speed of ball mill device is the first rotating speed, and the size that mill is situated between is straight
Footpath 1～2mm；
S2, magnetic metallic powder is carried out second level ball milling, until magnetic metallic powder flakiness shape and thin slice
Till before Po Sui；Wherein, the rotating speed of ball mill device is the second rotating speed, and the second rotating speed is less than the first rotating speed,
The size that mill is situated between is diameter 6～10mm.Specifically, big I is the first rotating speed 2/3rds of the second rotating speed.
Wherein, ball mill device can be ball mill or sand mill.Mill Jie can be steel ball or zirconium ball.
Wherein, the specific size of the first rotating speed can determine according to the equipment that reality uses.Such as, use is worked as
When model is " Nanjing Univ. Instrument Factory QM-3SP4 " planetary ball mill, the first rotating speed can be 350～400 turns
/ minute, the time of first order ball milling is 5 hours to 8 hours；Second rotating speed can be 200～250 revs/min,
The time of second level ball milling is 5 hours to 8 hours.Certainly, the present invention is not limited thereto, other type
Ball mill or sand mill all within protection scope of the present invention, and the specific size of the first rotating speed,
The time of one-level ball milling, the specific size of the second rotating speed, the time of second level ball milling use also dependent on reality
Equipment concrete decision, only need to ensure first order ball milling complete after magnetic metallic powder major part become round pie and
Thickness 3～5um, second level ball milling complete after magnetic metallic powder flakiness shape and thin slice close on broken but not
Broken.
The present embodiment is by first using undersized mill Jie metallic particles at high speed to magnetic metallic powder
Crush rapidly, make big metallic particles become the little metallic particles of blunt circle, use large scale the most again
Mill be situated between at the low rotational speed little metallic particles is carried out further flaky process；Magnetic the most in such a way
Metal dust processes, and easily prepares greater area of foil and is unlikely to again broken.
Empirical tests, the flat rate of the magnetic metallic powder that the present embodiment finally prepares reaches the ratio of length/thickness
Value is between 60～90.
Embodiment 2
Refer to the flattening method of the magnetic metallic powder that Fig. 2, Fig. 2 provide for another embodiment of the present invention
Flow chart, as in figure 2 it is shown, the flattening method of the magnetic metallic powder of the present embodiment offer uses ball milling dress
Put and magnetic metallic powder carried out successively three grades of ball millings, specifically include following steps:
S1, magnetic metallic powder is carried out first order ball milling, until magnetic metallic powder major part becomes round pie
And thickness stops when 3～5um；Wherein, the rotating speed of ball mill device is the first rotating speed (being set to V1), and mill is situated between
Size be diameter 1～2mm；
S2, magnetic metallic powder is carried out second level ball milling；Wherein, the rotating speed of ball mill device is the second rotating speed
(being set to V2), the second rotating speed V2 is less than the first rotating speed V1, and the size that mill is situated between is diameter 4～5mm；
S3, magnetic metallic powder is carried out third level ball milling, until magnetic metallic powder flakiness shape and thin slice
Till before Po Sui；Wherein, the rotating speed of ball mill device is the 3rd rotating speed (being set to V3), and the 3rd rotating speed V3 is little
In the second rotating speed V2, the size that mill is situated between is diameter 6～10mm.
Specifically, the 3rd rotating speed V3, the second rotating speed V2, the relation of the first rotating speed V1 can be:
V2=2/3V1；
V3=2/4V1。
Wherein, ball mill device can be ball mill or sand mill.Mill Jie can be steel ball or zirconium ball.
Wherein, the specific size of the first rotating speed can determine according to the equipment that reality uses.Such as, use is worked as
When model is " Nanjing Univ. Instrument Factory QM-3SP4 " planetary ball mill, the first rotating speed can be 350～400 turns
/ minute, the time of first order ball milling is 5 hours to 8 hours；Second rotating speed can be 200～250 revs/min,
The time of second level ball milling is 5 hours to 8 hours；3rd rotating speed can be 175～200 revs/min, the third level
The time of ball milling is 5 hours to 8 hours；.Certainly, the present invention is not limited thereto, other type of ball milling
Machine or sand mill are all within protection scope of the present invention, and the specific size of the first rotating speed, first order ball
Mill time, the specific size of the second rotating speed, the time of second level ball milling, the specific size of the 3rd rotating speed,
The equipment concrete decision that the time of third level ball milling uses also dependent on reality, only need to ensure that first order ball milling is complete
After one-tenth, magnetic metallic powder major part becomes round pie and thickness 3～5um, and after third level ball milling completes, magnetic is golden
Belong to powder flakiness shape and thin slice closes on and crushes but unbroken.
Compared with Example 1, the present embodiment is by increasing one-level ball milling further so that the final magnetic prepared
The flat rate of property metal dust is higher, reaches the ratio of length/thickness between 70～100, and whole ball
The time of mill is shorter.
Above example, only for the explanation present invention, can not be interpreted as limiting the invention.And it is
Obtaining more excellent effect, the present invention can also arrange more ball milling progression, it is assumed that be provided with n level ball milling
(n is integer, and n > 1), the rotation speed relation of ball millings the most at different levels is:
Vi=2/(i+1)V1
Wherein, i represents i-stage ball milling, 1 < i≤n；V1 represents the rotating speed of first order ball milling；Vi represents i-th
The rotating speed of level ball milling.
In sum, a kind of flattening method that the invention provides magnetic metallic powder uses ball mill device pair
Magnetic metallic powder carries out at least two-stage ball milling successively so that it is flattening；And the rotating speed of ball mill device is step by step
Reducing, the size that mill is situated between increases step by step, thus is conducive to improving the flat rate of magnetic metallic powder, experience
Card, the final flat rate of the magnetic metallic powder prepared by the method can reach length/thickness
Ratio is between 60～100；And the method efficiency is high, makes ball milling total time shorten.
Obviously, those skilled in the art can carry out various change and modification without deviating from the present invention to invention
Spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. the flattening method of a magnetic metallic powder, it is characterised in that the method uses ball mill device pair
Magnetic metallic powder carries out two-stage ball milling successively so that it is flattening；Wherein, it is placed with in described ball mill device
Mill is situated between；The rotating speed of ball mill device reduces step by step, and the size that mill is situated between increases step by step；
The progression of ball milling is two-stage；
The step of two-stage ball milling is:
Magnetic metallic powder is carried out first order ball milling, until magnetic metallic powder major part becomes round pie and thickness
Degree stops when 3～5um；Wherein, the rotating speed of ball mill device is the first rotating speed, and the size that mill is situated between is diameter
1～2mm；
Magnetic metallic powder is carried out second level ball milling, until magnetic metallic powder flakiness shape and thin slice crush
Till before；Wherein, the rotating speed of ball mill device is the second rotating speed, and the second rotating speed is less than the first rotating speed, and mill is situated between
Size be diameter 6～10mm.
2. the flattening method of magnetic metallic powder as claimed in claim 1, it is characterised in that second turn
Size is the first rotating speed 2/3rds of speed.
3. the flattening method of the magnetic metallic powder as described in any one of claim 1 to 2, its feature exists
In, described ball mill device is ball mill or sand mill.
4. the flattening method of the magnetic metallic powder as described in any one of claim 1 to 2, its feature exists
In, described mill is situated between for steel ball or zirconium ball.
5. the flattening method of the magnetic metallic powder as described in any one of claim 1 to 2, its feature exists
In, the flat rate of described magnetic metallic powder reaches the ratio of length/thickness between 60～100.
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| CN104646677B (en) * | 2015-01-05 | 2017-08-01 | 中国科学院物理研究所 | A kind of preparation method of magnetic powder |
| CN105838117B (en) * | 2016-04-27 | 2018-03-16 | 戴雨兰 | One kind is without ground magnetic flitter and its preparation method and application |
| CN105834439B (en) * | 2016-06-12 | 2017-12-12 | 横店集团东磁股份有限公司 | A kind of preparation method of flat soft-magnetic alloy powder |
| CN110517723B (en) * | 2019-08-30 | 2022-04-01 | 山东中瑞电子股份有限公司 | Preparation method of high-permeability GHz-band absorbing material |
| CN111482595A (en) * | 2020-05-22 | 2020-08-04 | 苏州安洁新材料有限公司 | Preparation method of flat high-frequency wave-absorbing magnetic powder |
| CN119910186B (en) * | 2025-04-01 | 2025-06-20 | 合肥中隐新材料有限公司 | Wave absorber suitable for 5G base station shielding material and preparation method thereof |
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|---|---|---|---|---|
| CN1688661A (en) * | 2001-09-06 | 2005-10-26 | 东洋铝株式会社 | Aluminum flake pigment, coating composition containing it, ink composition and film obtained therefrom |
| CN102002266A (en) * | 2010-10-28 | 2011-04-06 | 长沙族兴金属颜料有限公司 | Preparation method of silver dollar-shaped aluminum pigment |
| CN102601375A (en) * | 2012-03-29 | 2012-07-25 | 浙江南欧金属粉有限公司 | Flaky metal powder production process |
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| JPH09118904A (en) * | 1995-10-20 | 1997-05-06 | Toho Titanium Co Ltd | Manufacture of titanium powder |
| JP4449077B2 (en) * | 2003-08-05 | 2010-04-14 | 三菱マテリアル株式会社 | Fe-Ni-Mo-based flat metal soft magnetic powder and magnetic composite material including the soft magnetic powder |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1688661A (en) * | 2001-09-06 | 2005-10-26 | 东洋铝株式会社 | Aluminum flake pigment, coating composition containing it, ink composition and film obtained therefrom |
| CN102002266A (en) * | 2010-10-28 | 2011-04-06 | 长沙族兴金属颜料有限公司 | Preparation method of silver dollar-shaped aluminum pigment |
| CN102601375A (en) * | 2012-03-29 | 2012-07-25 | 浙江南欧金属粉有限公司 | Flaky metal powder production process |
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Effective date of registration: 20200811 Address after: No. 359, Jinou Road, Jianghai District, Jiangmen City, Guangdong Province:282 Nanshan Road, Jianghai District, Jiangmen City; 126 Gaoxin West Road, Jianghai District, Jiangmen City) No. 359, Jinou Road, Jianghai District, Jiangmen City, Guangdong Province (place of business: No. 282, Nanshan Road, Jianghai District, Jiangmen City; No. 126, Gaoxin West Road, Jianghai District, Jiangmen City) Patentee after: Jiangmen Jiangyi magnetic material Co.,Ltd. Address before: 430223 science and Technology University, East Lake Development Zone, Hubei, Wuhan Patentee before: JIANGFEN MAGNETIC MATERIAL (WUHAN) TECHNOLOGY RESEARCH AND DEVELOPMENT Co.,Ltd. |