CN107081429B - A kind of electric field-assisted ball grinding method - Google Patents
A kind of electric field-assisted ball grinding method Download PDFInfo
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- CN107081429B CN107081429B CN201710330729.9A CN201710330729A CN107081429B CN 107081429 B CN107081429 B CN 107081429B CN 201710330729 A CN201710330729 A CN 201710330729A CN 107081429 B CN107081429 B CN 107081429B
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- ball
- ball grinder
- voltage
- electric field
- grinder
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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Abstract
The present invention discloses a kind of electric field-assisted ball grinding method, includes the following steps, 1) electrode bar is sealingly mounted at ball grinder cover board middle part, and the ball grinder and electrode bar are connect with the two poles of the earth of high voltage power supply respectively；2) it is put into abrading-ball and powder to be processed in ball grinder, installs the cover board of ball grinder；3) ball grinder is fixedly mounted on the shake table of adherent ball-milling device, closed ball grinder is evacuated to lower than 1 × 10 by vacuum pump‑7Pa；4) high-voltage DC power supply or high-voltage ac power are connected, power parameter is adjusted, makes to form high-voltage dc or high-voltage alternating electric field in ball grinder body, while starting motor and driving exciting block, abrading-ball is set to do adherent movement in ball grinder, to realize electric field-assisted ball milling.The present invention forms strong electrical field inside ball grinder, so that sample powder obtains additional polarizing energy, promotes the formation of microdefect and promote the migration of charged defects, the mechanical energy generated with the adherent ball milling of abrading-ball is effectively combined, the chemical reaction between powder is accelerated, grinding efficiency is substantially increased.
Description
Technical field
The invention belongs to powder processing technology fields, and in particular to a kind of electric field-assisted ball grinding method.
Background technique
The method that high-energy ball milling prepares alloy powder is current superfine powder preparation and the most common technology of mechanical alloying
One of, it is usually to rotate or vibrate using high energy ball mill that metal or alloy powder is ground into ultrafine dust, i.e., by two kinds
Or two or more powder are put into the ball grinder of high energy ball mill carry out high-energy ball milling simultaneously, powder particle is through calendering, pressing, stone roller
Repetitive process that is broken, pressing again, can be such that powder grain and particle size constantly refines, and can finally obtain tissue and ingredient point
The uniform superfine alloy powder of cloth.Due to this method be so that powder is reached alloying using mechanical energy, rather than with thermal energy or
Electric energy, so the method that high-energy ball milling prepares alloy powder also becomes mechanical alloying.Currently, high-energy ball-milling process is ground in material
Study carefully field using increasingly extensive, pure metal nanometer powder, nanocrystalline intermetallics, nanometer can be prepared using high energy ball mill
Composite material, nano ceramic material etc. are a kind of approach of new material preparation.
As a kind of solid-state processing techniques, high-energy ball-milling process shows certain mandatory and non-equilibrium property, its essence
Upper is exactly the process forced an energy of powder processed.In existing high energy ball mill, oscillatory type ball mill is current
Using more one of ball mill, grinding processing capacity is big, but vibrator is generally only simple by rotation or vibrating ball
Grinding jar handles powder using the mechanical energy of abrading-ball in ball grinder, this largely influences processing efficiency, thus caused
Ball milling utensil is seriously polluted to product powder.
Summary of the invention
The present invention provides a kind of electric field-assisted ball grinding method for technical problem present in above-mentioned background technique, including
Following steps:
1) electrode bar is sealingly mounted to the middle part of the cover board of ball grinder, and the ball grinder and electrode bar respectively with height
Press the connection of the two poles of the earth of DC power supply or high-voltage ac power；
2) it is put into abrading-ball and powder to be processed in ball grinder, installs the cover board of ball grinder；
3) ball grinder is fixedly mounted on the shake table of adherent ball-milling device, closed ball grinder is taken out by vacuum pump
To lower than 1 × 10-7Pa makes to reach vacuum state in ball grinder；
4) high-voltage DC power supply or high-voltage ac power are connected, power parameter is adjusted, makes to form high straightening in ball grinder body
Galvanic electricity field or high-voltage alternating electric field, while starting motor and driving exciting block, so that abrading-ball is done adherent movement in ball grinder, thus real
Existing electric field-assisted ball milling.
The working principle of the invention is: by will vacuumize in ball grinder, makes to reach high vacuum state in ball grinder,
Ball milling tank body and electrode bar are connect with the two poles of the earth of high voltage direct current or high-voltage ac power respectively, make to form forceful electric power inside ball grinder
?；Forceful electric power field energy improves sample macroscopic view energy state to the polarization energy of sample powder instantaneity provided different from mechanical energy；
Electronic state can be promoted to change so that electronics transfer is more easier, chemical reaction is promoted to be easier to occur；It can promote defect
It is formed and migration, the activation energy for promoting mi-crochemistry to react reduces and be easier to occur；Especially for easy polarization material, electricity
The influence of field becomes apparent, and easy polarization material sample powder is more easier to process under electric field-assisted.
In addition, the present invention also provides following attached technical schemes:
Further, the tank body of the ball grinder includes the inner tank body and Metal Substrate material outer tank body of ceramic base material, interior
Tank body and outer tank body transition fit；The material of the abrading-ball is ceramic based material.Ceramic based material for example zirconium oxide, boron nitride,
Aluminium oxide, silicon nitride etc. are not sticked together using the tank body and abrading-ball of ceramic material with Metal Substrate sample powder substantially, Er Qietao
Ceramic material hardness is high, wearability is good, keeps sample more easily levigate.
Further, the thickness of the inner tank body is greater than 10mm.The inner tank body of ceramic material is avoided to be punctured by high voltage electric field
And short circuit occurs.
Further, the material of the cover board is insulating materials, such as polytetrafluoroethylene (PTFE), nylon, epoxy resin, phenolic aldehyde tree
Rouge or ceramic material etc..
Further, the voltage of the high-voltage DC power supply is 10-80kV；The voltage of the high-voltage ac power is 10-
80kV, frequency 1-30kHz.
Further, the surface that the electrode bar is located at the part inside ball grinder is equipped with tip protrusion.In this way so as to electricity
Pole stick is easier stored charge, so that the electric field strength formed under same voltage condition is greatly improved.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention forms strong electrical field inside ball grinder, and sample powder is incuded or polarized in strong electrical field, phase
When in the polarization energy provided different from mechanical energy to sample powder instantaneity, so that sample is in the high activity of higher energy
State substantially increases grinding efficiency so that following process process is easier to occur；
2, the strong electrical field that the present invention is formed in ball grinder also causes sample to generate electronic polarization, so that electronics is in bit-type
The distribution in space and energy space changes, since electronic factor is in leading position, in electricity in chemical reaction
Field induces lower electronics transfer to be easier, and chemical reaction is easier to carry out；
3, the present invention is formed by strong electrical field other than generating the influence of macroscopic view to specimen material, can also generate microcosmic
Influence, such as cause the formation of charged defects that can reduce i.e. defect and be more readily formed, charged defects because by electric field force thus more easily
Generate migration etc.；Since the formation and migration of defect are very important microreaction process, it is difficult that electric field promotes some to be formed
Defect formed, so that it may promote the microreaction process that can not be carried out under some normal conditions to be carried out, can be with
Accelerate certain microreaction processes；
4, the present invention is using electric field-assisted ball milling, electric field in addition to the influence that sample generates be very quickly, can
To say being instantaneity；In addition its penetration depth is larger, can coverage to material it is also larger；Especially to easy polarization material
For, the influence of electric field becomes apparent from than the influence of the modes such as plasma asistance ball milling, is very beneficial for the ball of easy polarization material
Mill processing；
5, present invention employs the methods of the adherent ball milling of abrading-ball, avoid the collision of abrading-ball and electric shock baton and damage electric shock
Stick, reduces consumptive material, while the abrading-ball under this adherent ball milling method is to be rolled across or slipped over larger pressure or skid crosses sample
Product, compare traditional vibratory milling mode, and sample is more easier to refine；
6, it for the present invention compares plasma asistance ball milling, does not need to increase dielectric gas, reduce because of dielectric gas
Interference of the purity factor to sample powder ball milling, reduce unnecessary pollution；
7, electric field-assisted ball grinding method of the invention is equally applicable to the general ball grinder that ball milling tank body is metal material
Situation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for realizing electric field-assisted ball-milling device of the invention；
Fig. 2 is the structural schematic diagram of ball grinder shown in Fig. 1；
Fig. 3 is abrading-ball motion profile figure of the invention；
Parts title and serial number in figure:
Motor 1, shake table 2, ball grinder 3, pedestal 4, vibration excitor 5, driving snake 6, upper guide post 7, lower guide post 8, pressure spring 9,
Groove 10, fixture 11, electrode bar 12, PU ventilation pipe 13, vacuum valve 14, power supply 15, abrading-ball 16, tip protrusion 17；
Inner tank body 301, outer tank body 302, cover board 303.
Specific embodiment
The present invention is described below in conjunction with drawings and examples, following embodiment is explained with invention optimal effectiveness,
But the limitation of these embodiments and non-present invention.
Embodiment 1:
As shown in Figs. 1-2, electric field-assisted ball-milling device of the invention, including motor 1, shake table 2,3 and of ball grinder are realized
Pedestal 4 is provided with vibration excitor 5 in the middle part of shake table 2, driving snake is arranged between the output shaft of motor 1 and the rotation axis of vibration excitor 5
6 connections, the center line horizontal alignment of the rotation axis of the output shaft and vibration excitor 5 of motor 1；Shake table 2 bottom four angle is equipped with
Upper guide post 7,4 upside corresponding position of pedestal are equipped with lower guide post 8, and cylindrical pressure spring 9, pressure spring are equipped between upper guide post 7 and lower guide post 8
9 are directly placed on upper guide post 7 and lower guide post 8, convenient for replacing corresponding matched pressure spring 9 when replacing ball grinder；2 two sides of shake table point
Not She You symmetrical circular groove 10, ball grinder 3 is placed in groove 10 with horizontal, and every side groove 10 places 1 ball grinder
3,3 left and right horizontal of ball grinder of two sides is symmetrical；Ball grinder 3 is equipped with the arc-shaped fixture 11 that will be used to fasten ball grinder 3, folder
Tool 11 is fixed by screws in the two sides of groove 10；Motor 1 is additionally provided with the governor that can set motor speed and time.
The tank body of ball grinder 3 is cylindric double-layer structure, and inner tank body 301 is made of ceramic base material, such as aluminium oxide,
Zirconium oxide or silicon nitride etc., the thickness of inner tank body 301 are greater than 10mm, and outer tank body 302 is made of Metal Substrate material, such as hard
Alloy, stainless steel etc., inner tank body 301 and 302 transition fit of outer tank body；Abrading-ball 16 is made of ceramic base material；Ball grinder 3
Cover board 303, which is adopted, to be made from an insulative material, and 303 lateral surface of cover board is sealedly connected with PU ventilation pipe 13, the other end of PU ventilation pipe 13
It is connect with vacuum valve 14, vacuum valve 14 can be remotely from the place of shake table, carry out ball by vacuum valve 14 and vacuum pump
Grinding jar vacuumizes.The surface that electrode bar 12 is located at the part inside ball grinder is equipped with tip protrusion.
Electrode bar 12 is connect with the two poles of the earth of power supply 15 respectively with the outer tank body 302 of ball grinder.Power supply 15 selects high voltage direct current
Power supply, voltage 10-80kV.
The step of this electric field-assisted ball grinding method, is as follows:
1) electrode bar is sealingly mounted to the middle part of the cover board of ball grinder, and the ball grinder and electrode bar respectively with height
Press the two poles of the earth connection of DC power supply；
2) it is put into abrading-ball and powder to be processed in ball grinder, installs the cover board of ball grinder；
3) ball grinder is fixedly mounted on the shake table of adherent ball-milling device, closed ball grinder is taken out by vacuum pump
Vacuum is to being lower than 1 × 10-7Pa；
4) high voltage direct current source current is connected, according to power parameter is adjusted, output voltage 60kV makes shape in ball grinder body
At high-voltage dc electric field, while starting motor and driving exciting block, so that abrading-ball is done adherent movement in ball grinder, such as Fig. 3 institute
Show, to realize electric field-assisted ball milling.
Embodiment 2:
In the present embodiment, difference from Example 1 is, ball grinder and electrode bar are respectively turned on high-voltage DC power supply
The two poles of the earth, adjusting power parameter, output voltage 70kV, remaining working principle are same as Example 1.
Embodiment 3:
In the present embodiment, difference from Example 1 is, ball grinder and electrode bar are respectively turned on high-voltage DC power supply
The two poles of the earth, adjusting power parameter, output voltage 50kV, remaining working principle are same as Example 1.
Embodiment 4:
In the present embodiment, difference from Example 1 is, power supply 15 is using high-voltage ac power；Ball grinder with
Electrode bar is respectively turned on the two poles of the earth of high-voltage ac power, adjusts power parameter, output voltage 60kV, and frequency is 20 kHz,
Remaining working principle is identical as implementing 1.
Embodiment 5:
In the present embodiment, difference from Example 4 is, ball grinder and electrode bar are respectively turned on high-voltage ac power
The two poles of the earth adjust power parameter, output voltage 70kV, and frequency is 25 kHz, remaining working principle is identical as implementing 4.
Embodiment 6:
In the present embodiment, difference from Example 4 is, ball grinder and electrode bar are respectively turned on high-voltage ac power
The two poles of the earth adjust power parameter, output voltage 50kV, and frequency is 15 kHz, remaining working principle is identical as implementing 4.
Obviously, above-described embodiment is just for the sake of clearly illustrating examples made by the present invention, and is not the limit to implementation
It is fixed.For the those of ordinary skill in the field, it can also make on the basis of the above description other various forms of
Variation changes.There is no need and unable to all embodiment party's formulas with exhaustion.And it thus amplifies out obvious
Variation or variation are still in the protection scope of this invention.
Claims (6)
1. a kind of electric field-assisted ball grinding method, it is characterised in that: include the following steps,
1) electrode bar is sealingly mounted to the middle part of the cover board of ball grinder, and the ball grinder and electrode bar respectively with high straightening
Galvanic electricity source or the connection of the two poles of the earth of high-voltage ac power；
2) it is put into abrading-ball and powder to be processed in ball grinder, installs the cover board of ball grinder；
3) ball grinder is fixedly mounted on the shake table of adherent ball-milling device, closed ball grinder is vacuumized by vacuum pump
To lower than 1 × 10-7Pa；
4) high-voltage DC power supply or high-voltage ac power are connected, power parameter is adjusted, makes to form high voltage direct current in ball grinder body
Field or high-voltage alternating electric field, while starting motor and driving exciting block, so that abrading-ball is done adherent movement in ball grinder, to realize electricity
Field auxiliary ball milling.
2. a kind of electric field-assisted ball grinding method according to claim 1, it is characterised in that: the tank body of the ball grinder includes
The inner tank body and Metal Substrate material outer tank body of ceramic base material, inner tank body and outer tank body transition fit；The material of the abrading-ball is
Ceramic based material.
3. a kind of electric field-assisted ball grinding method according to claim 2, it is characterised in that: the thickness of the interior ceramic tank body
Greater than 10mm.
4. a kind of electric field-assisted ball grinding method according to claim 1, it is characterised in that: the material of the cover board is insulation
Material.
5. a kind of electric field-assisted ball grinding method according to claim 1, it is characterised in that: the electricity of the high-voltage DC power supply
Pressure is 10-80kV；The voltage of the high-voltage ac power is 10-80kV, frequency 1-30kHz.
6. a kind of electric field-assisted ball grinding method according to claim 1, it is characterised in that: the electrode bar is located at ball grinder
The surface of internal part is equipped with tip protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710330729.9A CN107081429B (en) | 2017-05-11 | 2017-05-11 | A kind of electric field-assisted ball grinding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710330729.9A CN107081429B (en) | 2017-05-11 | 2017-05-11 | A kind of electric field-assisted ball grinding method |
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| CN107081429B true CN107081429B (en) | 2019-02-05 |
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| CN201710330729.9A Expired - Fee Related CN107081429B (en) | 2017-05-11 | 2017-05-11 | A kind of electric field-assisted ball grinding method |
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| CN111592892A (en) * | 2020-04-28 | 2020-08-28 | 山东科技大学 | Method for preparing high-performance PAL material by using non-metallic mineral palygorskite |
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| CN2780327Y (en) * | 2005-04-07 | 2006-05-17 | 华南理工大学 | Corona plasma auxiliary high energy ball mill |
| CN100333835C (en) * | 2005-07-29 | 2007-08-29 | 华南理工大学 | High energy ball mill method with plasma aid |
| CN101181752B (en) * | 2007-12-14 | 2011-04-06 | 华南理工大学 | Method for preparing WC-Co series nano composite hard alloy powder |
| CN103191683B (en) * | 2013-03-01 | 2014-11-26 | 北京理工大学 | Device of preparing nano powder material through electrical explosion |
| CN104549658B (en) * | 2014-12-24 | 2017-04-12 | 华南理工大学 | Cold field plasma discharge assisted high energy ball milled powder device |
| CN105505478B (en) * | 2015-11-30 | 2018-04-10 | 中国科学院广州能源研究所 | A kind of dizzy thick gas cleaning device of gasification of biomass of electric tornado flow photoelectricity and method |
| CN205797364U (en) * | 2016-07-21 | 2016-12-14 | 集美大学 | A kind of plasma auxiliary high-energy ball mill device for preparing lube oil additive |
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