CN107721404A - For manufacturing the dry-pressing opposite sex magnetic of multisegmented rotor, its preparation method and by its obtained permanent-magnet ferrite - Google Patents
For manufacturing the dry-pressing opposite sex magnetic of multisegmented rotor, its preparation method and by its obtained permanent-magnet ferrite Download PDFInfo
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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
- C04B35/2608—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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- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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Abstract
The present invention relates to the dry-pressing opposite sex magnetic for manufacturing multisegmented rotor, its preparation method and by its obtained permanent-magnet ferrite.The preparation method comprises the following steps：(1) presintering material, dispensing and water are mixed and carries out fine grinding, obtain slurry, the slurry obtains dry powder through drying process；(2) dry powder is disperseed, obtains dry-pressing powder；(3) dry-pressing powder, additive and the oil-based solvent are stirred, obtains the magnetic；Wherein, the additive is selected from silica and/or alpha-phase aluminum oxide；It is 2~5 with the ratio between the average grain diameter of the additive and the average grain diameter of the dry-pressing powder.The permanent-magnet ferrite is formed using magnetic through dry-pressing formed and sintering.Not only granularity is thinner for magnetic provided by the invention, and also overcome traditional granularity of magnet powder more thin easier adsorbed gas the problem of so that having more excellent magnetic property and higher formed body yield rate concurrently using sintered body made of the magnetic.
Description
Technical field
The present invention relates to technical field of magnetic materials, more particularly to a kind of dry-pressing opposite sex magnetic for being used to manufacture multisegmented rotor
Powder, its preparation method and by its obtained permanent-magnet ferrite.
Background technology
In recent years, the high speed development in the field such as computer, automotive electronics and electric automobile, household electrical appliance is to permanent-magnet ferrite
Material provides more wide application market.Developed country reduces scale and yield, and the production of permanent-magnet ferrite is into development
The main trend of country's transfer provides chance for developing country's Development Permanent Magnet ferrite industry including China.
The preparation method of anisotropy sintered permanent ferrite generally comprises once formula, pre-sintering, coarse crushing, secondary matched somebody with somebody
Side, wet-milling, drying, shaping and double sintering.It can be divided into Wet-pressing molding and dry-pressing formed two types according to forming method.It is wet
Molded due to there is the presence of the decentralized media such as water or ethanol, therefore ferrite particle is easy to rotate, and obtains higher shaping and takes
Xiang Du, thus higher magnetic property can be obtained.But requirement of the Wet-pressing molding to equipment is higher, cost is also higher.It is dry-pressing formed not have
There is decentralized medium, therefore be not easy to be orientated, magnetic property is poor.It is but dry-pressing formed to have the advantages that shaping speed is fast, production efficiency is high.
Wet-pressing molding manufactured size is small or thin, on complex-shaped and various extremely radial oriented magnetic devices by compared with
Big limitation.Therefore, make this kind of magnetic device mainly or utilize dry-pressing formed method.It is flourishing with domestic automobile industry
Development, the raising of the degree of office automation and the popularization of household electrical appliance, the demand of this kind of magnetic device is increasing, and high-performance
The requirement of change is more and more prominent.
For manufacturing multisegmented rotor (such as 8 poles, 32 of the equipment such as motor, electromagnetic coupling, decelerator and brake
Pole) it is exactly a major class in above-mentioned magnetic device.How by improve magnetic magnetic property come improve the magnetic property of multisegmented rotor into
For the study hotspot of numerous domestic producer.
In general, the granularity for being molded material therefor (i.e. magnetic) is more thin better.Granularity slightly, suppresses obtained magnetic very much
The density of device is inadequate, can not meet requirement.Granularity is thinner, and the magnetic property through the formed body obtained by dry-pressing formed processing is got over
It is good.But in actual production, granularity general control adds a certain amount of shaping addition in shaping at 0.8~0.9 μm
Agent (typical additives include camphor, calcium stearate, polyvinyl alcohol and polyethylene glycol) ensures the yield rate of formed body and production
Efficiency.If granularity is less than this numerical value, although the magnetic property of formed body is excellent, because granularity is too thin, also result in as follows
Problem：First, material adsorbs more gas, so that formed body low intensity, and easily ftracture；Second, dry-pressing formed
During, easily there is the problem of running powder.
In view of this, it is special to propose the present invention.
The content of the invention
(1) technical problems to be solved
When existing granularity of magnet powder is smaller during for using dry-press process manufacture this kind of magnetic device of multisegmented rotor, formed body is strong
Low, easy cracking is spent, so that the problem of formed body yield rate is low, is used to manufacture multisegmented rotor the invention provides a kind of
Dry-pressing opposite sex magnetic, not only granularity is thinner for the magnetic, and also overcome traditional granularity of magnet powder it is too thin when existing finished product it is easy
The problem of powder is easily run in cracking, manufacturing process, so that having more excellent magnetic concurrently using sintered body made of the magnetic
Performance and higher formed body yield rate.
(2) technical scheme
In order to solve the above-mentioned technical problem, the invention provides following technical scheme：
For the preparation method for the dry-pressing opposite sex magnetic for manufacturing multisegmented rotor, the preparation method comprises the following steps：
(1) presintering material, dispensing and water are mixed and carries out fine grinding, obtain slurry, the slurry obtains through drying process
Dry powder；
(2) dry powder is disperseed, obtains dry-pressing powder；
(3) dry-pressing powder, additive and the oil-based solvent are stirred, obtains the magnetic；
Wherein, the additive is selected from silica and/or alpha-phase aluminum oxide；With
The ratio between the average grain diameter of the additive and the average grain diameter of the dry-pressing powder are 2~5.
Preferably, in step (3), the oil-based solvent is selected from saualane or vegetative grease；And/or
The mass ratio of the dry-pressing powder, the additive and the oil-based solvent is 100：(0.1~0.5)：(0.1
~1).
Preferably, it is described to disperse to carry out as follows in step (2)：The dry powder is subjected to vibration, then
The dry powder after vibration is stirred, obtains the dry-pressing powder；
The time of the vibration is preferably 60~150 minutes, most preferably 130~150 minutes.
Preferably, in step (1), the dispensing is selected from by calcium carbonate, silica, aluminum oxide, chromium oxide, bismuth oxide
With the group of boric acid composition.
It is further preferred that in the dispensing, the calcium carbonate, the silica, the aluminum oxide, the oxidation
Chromium, the bismuth oxide, the dosage of the boric acid are respectively 0.5~1.5wt% of the presintering material, 0.1~0.5wt%, 0.5
~1.5wt%, 0.5~1.5wt%, 0.1~0.5wt%, 0.1~0.5wt%；
In step (1), by the content water management of the slurry in 30~40wt%；And/or
In step (1), by the time control of the fine grinding at 9~30 hours, preferably 15~20 hours, obtained institute
The particle mean size for stating dry powder is 0.2~0.85 μm.
Preferably, in step (1), the presintering material is prepared as follows：
(a) batch mixing：With Fe2O3、SrCO3、La2O3And Co3O4For preparing raw material, according to molecular formula：Sr1-xLaxFe2n- yCoyO19Each raw material is prepared, the span that wherein x span is 0.1~0.3, y is 0.1~0.3, and x is not more than y, n
Span be 5.5~6.0；
(b) it is pre-sintered：Preparing raw material is mixed, pellet is made, the pellet is sintered, obtains the presintering material.
It is further preferred that in step (b), the preparing raw material is mixed by the way of dry or wet mixing；With
The temperature for controlling the sintering is 1100~1400 DEG C, and is incubated 1~2 hour.
A kind of dry-pressing opposite sex magnetic for being used to manufacture multisegmented rotor, is made using above-mentioned preparation method.
A kind of permanent-magnet ferrite, it is made using above-mentioned dry-pressing opposite sex magnetic through dry-pressing formed and sintering.
Preferably, it is described dry-pressing formed to comprise the following steps：The magnetic is placed in magnetic field and is molded, is molded
Body；With
The sintering comprises the following steps：The formed body is heat-treated at 100~300 DEG C, then 1150~1350
Sintered at DEG C, and be incubated 1~2 hour.
(3) beneficial effect
The above-mentioned technical proposal of the present invention has the following advantages that：
Not only granularity is thinner for magnetic provided by the invention, and also overcomes the more thin easier adsorbed gas of traditional granularity of magnet powder
Body and there is the problem of running powder, so that having more excellent magnetic property and higher concurrently using sintered body made of the magnetic
Formed body yield rate.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the embodiment of the present invention, to this hair
Bright technical scheme is clearly and completely described.Obviously, described embodiment is the part of the embodiment of the present invention, and
The embodiment being not all of.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work
On the premise of the every other embodiment that is obtained, belong to the scope of protection of the invention.
Firstth, the invention provides a kind of preparation method for being used to manufacture the dry-pressing opposite sex magnetic of multisegmented rotor, the system
Preparation Method comprises the following steps：
(1) presintering material, dispensing and water are mixed and carries out fine grinding, obtain slurry, the slurry obtains through drying process
Dry powder.Dispensing used is selected from the group being made up of calcium carbonate, silica, aluminum oxide, chromium oxide, bismuth oxide and boric acid.
It is further preferred that in the dispensing, the calcium carbonate, the silica, the aluminum oxide, the chromium oxide, the oxygen
Change 0.5~1.5wt%, 0.1~0.5wt%, 0.5 that bismuth, the dosage of the boric acid are respectively the presintering material~
1.5wt%, 0.5~1.5wt%, 0.1~0.5wt%, 0.1~0.5wt%.The present invention is entered all materials using wet mixing mode
Row mixing, wet mixing make material have thinner granularity.It is, of course, also possible to mixed all materials using dry-mixed mode, will
Presintering material and dispensing are put into mixed machine by force, and mixed a period of time (such as 5~10 minutes) obtains dry powder by force.In order that material is more
Add and be fully ground, the present invention controls the dosage of water in wet mixing, makes the aqueous of the slurry that the dosage of water is able to ensure that to obtain
Amount is in 30~40wt%.For equipment used, ball mill (such as horizontal ball mill) can be selected.For fine grinding of the present invention when
Between, optional scope is 9~30 hours, and the particle mean size of obtained dry powder is 0.2~0.85 μm.The time of fine grinding gets over
Long, the granularity of dry powder is thinner.Certainly, in optional scope, preferable milling time is 15~20 hours.Although fine grinding
Time is longer, and the granularity of powder is thinner, but production efficiency also decreases, and production cost also increases.Inventor's discovery, when
During more than 20 hours, the trend that granularity diminishes slows down, and cost is significantly increased.Therefore, the time of fine grinding is preferably controlled in 15
~20 hours.
For the presintering material in this step, can use in the prior art pre-sintered made from disclosed method
Material, such as the method disclosed in the application documents such as CN102936130A, CN102898127A.It is, of course, also possible to using the present invention
Method after the optimization of offer prepares presintering material.After optimization, Co dosage is reduced, it is real while cost degradation
High performance is showed.Specifically, the presintering material is prepared as follows：
(a) batch mixing：With Fe2O3、SrCO3、La2O3And Co3O4For preparing raw material, according to molecular formula：Sr1-xLaxFe2n- yCoyO19Each raw material is prepared, the span that wherein x span is 0.1~0.3, y is 0.1~0.3, and x is not more than y, n
Span be 5.5~6.0.
(b) it is pre-sintered：Preparing raw material is mixed, pellet is made, the pellet is sintered, by the material ball crushing after sintering,
Obtain the presintering material.In this step, it can be mixed, can also be carried out using wet mixing mode using dry-mixed mode
Mixing.When being mixed using dry-mixed mode, by Fe2O3、SrCO3、La2O3And Co3O4These preparing raw materials are put into mixed machine by force and mixed
Close a period of time, such as 1~5 minute.When being mixed using wet mixing mode, above-mentioned preparing raw material is put into ball mill, added
Enter the water that quality is 25~65wt% of preparing raw material gross mass, then grinding a period of time (such as 1~5 hour).The temperature of sintering
Degree is chosen as 1100~1400 DEG C, and is incubated 1~2 hour.
(2) dry powder is disperseed, obtains dry-pressing powder.The scattered scattered side that can use routine
Method, such as the process for dispersing of high-speed stirred.Certainly, in order to improve the dispersive property of powder, after the present invention can use optimization
Process for dispersing.Specifically, the process for dispersing comprises the following steps：The dry powder is subjected to vibration, then by the institute after vibration
State dry powder to be stirred, obtain the dry-pressing powder.The time of the vibration is preferably 60~150 minutes, is most preferably
130~150 minutes.The vibration time is longer, and the dispersiveness of powder is better.
(3) dry-pressing powder, additive and the oil-based solvent are stirred, obtains the magnetic.Wherein, the addition
Agent is selected from silica and/or alpha-phase aluminum oxide；The ratio between the average grain diameter of the additive and the average grain diameter of the dry-pressing powder
For 2~5.The average grain diameter additive bigger than the average grain diameter of dry-pressing powder added in the present invention and the oil added
Property solvent is uniformly mixed in dry-pressing powder, can reduce the surface-active of powder.So, when dry-pressing formed, even if powder
Material has thinner granularity (such as less than 0.8 μm), and formed body still has higher yield rate.Therefore when preparing magnetic, can be with
Extend the fine grinding time, obtain the thinner material of granularity；And/or the vibration time can be extended, the more preferable material of dispersiveness is obtained,
So that there is more excellent magnetic property after formed body sintering.In addition, when dry-pressing formed, magnetic provided by the invention has
Excellent tightly packed performance, more preferable sintered density and compactness are obtained in sintering, so that the formed body tool after sintering
There is more preferable intensity.In addition, the good fluidity of magnetic provided by the invention, surface smoothness is high, when dry-pressing formed, can subtract
Few frictional force between mould therefor.Additive used can select the high mineral grain of fusing point.Certainly, it is most preferably this
Invention silica and/or alpha-phase aluminum oxide used so that the formed body after sintering has more preferable intensity.In the present invention, institute
State oil-based solvent and be selected from saualane or vegetative grease.Here vegetative grease includes soybean oil, palm oil, olive oil, jade
Rice bran oil etc..In addition, the mass ratio of the dry-pressing powder, the additive and the oil-based solvent is 100：(0.1~0.5)：
(0.1~1).
Secondth, present invention also offers a kind of dry-pressing opposite sex magnetic for being used to manufacture multisegmented rotor, using above-mentioned preparation side
Method is made.
3rd, present invention also offers a kind of permanent-magnet ferrite, using above-mentioned dry-pressing opposite sex magnetic through dry-pressing formed and burning
Knot is made.Preferably, it is described dry-pressing formed to comprise the following steps：The magnetic is placed in magnetic field and is molded, obtains formed body；
The sintering comprises the following steps：The formed body is heat-treated at 100~300 DEG C, then sintered at 1150~1350 DEG C,
And it is incubated 1~2 hour.
It is several specific embodiments provided by the invention below.
Embodiment 1
(1) it is pre-sintered：According to molecular formula Sr1-xLaxFe2n-yCoyO19Prepare Fe2O3、SrCO3、La2O3And Co3O4Four kinds of systems
Standby raw material, wherein x=y=0.1, n=5.5.Then, by Fe2O3、SrCO3、La2O3And Co3O4It is put into ball mill, adds matter
Measure as raw material gross mass 30wt% water, then grind 2 hours.Pellet is made after drying in the aqueous slurry that grinding is obtained, so
Pellet is put into Muffle furnace afterwards and carries out pre-sintering, pre-sintering temperature is 1100 DEG C, and is incubated 2 hours at this temperature.Most
Afterwards, the pellet after pre-sintering is crushed, obtains presintering material.
(2) 100 parts, 0.1 part silica of presintering material made from step (1), 0.5 part of calcium carbonate and 67 parts of water are put into
Fine grinding is carried out in ball mill, obtained slurry is dried at 20 hours for fine grinding time control, and it is 0.6 μ to obtain particle mean size
M dry powder.
(3) dry powder that step (2) obtains is put into vibrating ball-mill and carries out vibration, the vibration time is 50 minutes.Then
Dry powder after vibration is stirred, obtains dry-pressing powder.
(4) 0.5 part of 100 parts of dry-pressing powder, 0.1 part of silica, 0.1 part of alpha-phase aluminum oxide and saualane are stirred,
Obtain the dry-pressing opposite sex magnetic for manufacturing multisegmented rotor.Wherein, the particle diameter of silica and alpha-phase aluminum oxide is 1.2 μm.
(5) magnetic made from step (4) is placed in magnetic field and be molded, magnetic field intensity 6000Oe, briquetting pressure 6MPa,
Obtain formed body.Then, formed body is placed in Muffle furnace and sintered, sintering temperature is 1300 DEG C, and is incubated 2 at this temperature
Hour, obtain sintered body, i.e. permanent-magnet ferrite.
Embodiment 2 is to embodiment 6
Preparation method is substantially the same with embodiment, and difference is that the time of vibration in step (3) is different, is respectively
60 minutes, 120 minutes, 130 minutes, 150 minutes, 170 minutes.
Embodiment 7 is to embodiment 12
Preparation method is substantially the same with embodiment 4, and difference is：
Time of fine grinding in step (2) is different, respectively 7 hours, 9 hours, 12 hours, 15 hours, 16.5 hours, it is 30 small
When, the particle diameter of obtained dry powder is respectively 0.93 μm, 0.85 μm, 0.71 μm, 0.55 μm, 0.27 μm, 0.2 μm.
In step (4), the particle diameter of additive is respectively 1.86 μm, 1.7 μm, 1.42 μm, 1.65 μm, 1.08 μm, 1 μm.
Embodiment 13
Preparation method is substantially the same with embodiment 4, and difference is：
In step (1), x=y=0.3, n=6.0, pre-sintering temperature are 1400 DEG C, are incubated 1 hour.
In step (2), by 100 parts of presintering material, 1.5 parts of calcium carbonate, 0.5 part of silica, 1.5 parts of aluminum oxide, oxygen
Change 45 parts of 1.5 parts of chromium, 0.5 part of bismuth oxide, 0.5 part of boric acid and water, obtain the dry powder that particle mean size is 0.62 μm.
In step (4), by 100 parts of dry-pressing powder, 0.5 part of 0.5 part of the silica and palm oil that granularity is 1.24 μm
Stir, obtain magnetic provided by the invention.
Embodiment 14
Preparation method is substantially the same with embodiment 4, and difference is：
In step (1), x=0.1, y=0.2, n=5.6.
In step (4), 1 part of 100 parts of dry-pressing powder, 0.5 part of the alpha-phase aluminum oxide that granularity is 1.2 μm and olive oil are stirred
Mix uniformly, obtain magnetic provided by the invention.
Embodiment 15
Preparation method is substantially the same with embodiment 4, and difference is：
In step (1), presintering material used is prepared with the following method：
With Fe2O3、SrCO3For preparing raw material, and according to molecular formula：SrO·5.85Fe2O3Each component dosage.
Embodiment 16
Preparation method is substantially the same with embodiment 4, and difference is：
In step (4), 0.5 part of 100 parts of dry-pressing powder and saualane are stirred, obtain dry-pressing opposite sex magnetic.
Embodiment 17
Preparation method is substantially the same with embodiment 4, and difference is：
In step (4), 0.1 part of 100 parts of dry-pressing powder, 0.1 part of silica and alpha-phase aluminum oxide are stirred, obtained
To dry-pressing opposite sex magnetic.
Embodiment 18
Preparation method is substantially the same with embodiment 4, and difference is：
In step (4), silica, alpha-phase aluminum oxide and saualane are not added with.
The yield rate of preparation method and the magnetic of obtained sintered body (i.e. permanent-magnet ferrite) used to each embodiment
Performance is detected, and testing result is shown in Table 1.In addition, table 1 also describes the preparation condition of each embodiment.
Table 1
Note："-" in table 1, which represents, does not add.
Testing result from embodiment 1 to embodiment 6 can be seen that with the extension of vibration time, the magnetic of sintered body
Can be also better.Silica and/or alpha-phase aluminum oxide and oil-based solvent that the present invention with the addition of specified particle size are additionally, since, is burnt
The yield rate of knot body also greatly improves.When vibration time lengthening was to 170 minutes (see embodiment 6), under the coercivity of sintered body
Drop, yield rate are also greatly reduced.Therefore, can be by vibration time control at 50~150 minutes in reality into production.
From embodiment 7 to embodiment 12 prolonging with the fine grinding time is can be seen that in conjunction with the testing result of embodiment 4
Long, dry powder granularity also tapers into, and granularity is smaller, and the magnetic property of sintered body is better, but yield rate decreases.
Testing result from embodiment 13 to embodiment 18 can be seen that when only addition silica, α phase oxidations in magnetic
One kind in aluminium, oil-based solvent or when not adding any component, the yield rate of the sintered body formed using magnetic sintering is significantly
Decline, magnetic property change is little.
Magnetic provided by the invention for the less demanding of presintering material, even if using traditional iron strontium presintering material (see
Embodiment 15), the sintered body formed using magnetic sintering still has excellent magnetic property and higher yield rate.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. the preparation method of the dry-pressing opposite sex magnetic for manufacturing multisegmented rotor, it is characterised in that the preparation method is included such as
Lower step：
(1) presintering material, dispensing and water are mixed and carries out fine grinding, obtain slurry, the slurry obtains drying through drying process
Powder；
(2) dry powder is disperseed, obtains dry-pressing powder；
(3) dry-pressing powder, additive and the oil-based solvent are stirred, obtains the magnetic；
Wherein, the additive is selected from silica and/or alpha-phase aluminum oxide；With
The ratio between the average grain diameter of the additive and the average grain diameter of the dry-pressing powder are 2~5.
2. preparation method according to claim 1, it is characterised in that in step (3), the oil-based solvent is selected from spiny dogfish
Alkane or vegetative grease；And/or
The mass ratio of the dry-pressing powder, the additive and the oil-based solvent is 100：(0.1~0.5)：(0.1~1).
3. preparation method according to claim 1, it is characterised in that described to disperse as follows in step (2)
Carry out：The dry powder is subjected to vibration, then the dry powder after vibration is stirred, obtains the dry-pressing powder
Material；
The time of the vibration is preferably 60~150 minutes, most preferably 130~150 minutes.
4. preparation method according to claim 1, it is characterised in that in step (1), the dispensing is selected from by carbonic acid
The group that calcium, silica, aluminum oxide, chromium oxide, bismuth oxide and boric acid form.
5. preparation method according to claim 4, it is characterised in that in the dispensing, the calcium carbonate, the titanium dioxide
Silicon, the aluminum oxide, the chromium oxide, the bismuth oxide, the dosage of the boric acid be respectively the presintering material 0.5~
1.5wt%, 0.1~0.5wt%, 0.5~1.5wt%, 0.5~1.5wt%, 0.1~0.5wt%, 0.1~0.5wt%；
In step (1), by the content water management of the slurry in 30~40wt%；And/or
In step (1), by the time control of the fine grinding at 9~30 hours, preferably 15~20 hours, what is obtained was described dry
The particle mean size of dry powder is 0.2~0.85 μm.
6. according to the preparation method described in any one of claim 1 to 5, it is characterised in that in step (1), the pre-sintering
Material is prepared as follows：
(a) batch mixing：With Fe2O3、SrCO3、La2O3And Co3O4For preparing raw material, according to molecular formula：Sr1-xLaxFe2n-yCoyO19Match somebody with somebody
Each raw material is made, the span that wherein x span is 0.1~0.3, y is 0.1~0.3, and x is not more than y, n value model
Enclose for 5.5~6.0；
(b) it is pre-sintered：Preparing raw material is mixed, pellet is made, the pellet is sintered, obtains the presintering material.
7. preparation method according to claim 6, it is characterised in that in step (b), by the way of dry or wet mixing
The preparing raw material is mixed；With
The temperature for controlling the sintering is 1100~1400 DEG C, and is incubated 1~2 hour.
8. a kind of dry-pressing opposite sex magnetic for being used to manufacture multisegmented rotor, it is characterised in that using any one of claim 1 to 7 institute
Preparation method is stated to be made.
9. a kind of permanent-magnet ferrite, it is characterised in that be made using magnetic described in claim 8 through dry-pressing formed and sintering.
10. permanent-magnet ferrite according to claim 9, it is characterised in that described dry-pressing formed to comprise the following steps：By institute
State magnetic and be placed in magnetic field and be molded, obtain formed body；With
The sintering comprises the following steps：The formed body is heat-treated at 100~300 DEG C, then at 1150~1350 DEG C
Sintering, and it is incubated 1~2 hour.
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| CN201711103026.9A CN107721404A (en) | 2017-11-10 | 2017-11-10 | For manufacturing the dry-pressing opposite sex magnetic of multisegmented rotor, its preparation method and by its obtained permanent-magnet ferrite |
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| CN201711103026.9A CN107721404A (en) | 2017-11-10 | 2017-11-10 | For manufacturing the dry-pressing opposite sex magnetic of multisegmented rotor, its preparation method and by its obtained permanent-magnet ferrite |
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| CN112919896A (en) * | 2020-12-28 | 2021-06-08 | 横店集团东磁股份有限公司 | Preparation method of high-density permanent magnetic ferrite material |
| CN112919895A (en) * | 2020-12-28 | 2021-06-08 | 横店集团东磁股份有限公司 | Preparation method of magnet applying anisotropic dry-pressed ferrite fine powder |
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| CN112919896A (en) * | 2020-12-28 | 2021-06-08 | 横店集团东磁股份有限公司 | Preparation method of high-density permanent magnetic ferrite material |
| CN112919895A (en) * | 2020-12-28 | 2021-06-08 | 横店集团东磁股份有限公司 | Preparation method of magnet applying anisotropic dry-pressed ferrite fine powder |
| CN112919896B (en) * | 2020-12-28 | 2022-01-18 | 横店集团东磁股份有限公司 | Preparation method of high-density permanent magnetic ferrite material |
| CN112919895B (en) * | 2020-12-28 | 2022-02-18 | 横店集团东磁股份有限公司 | Preparation method of magnet applying anisotropic dry-pressed ferrite fine powder |
| CN112645719A (en) * | 2020-12-29 | 2021-04-13 | 横店集团东磁股份有限公司 | Method for improving radial shrinkage of permanent magnetic ferrite magnet |
| CN112645719B (en) * | 2020-12-29 | 2022-04-19 | 横店集团东磁股份有限公司 | Method for improving radial shrinkage of permanent magnetic ferrite magnet |
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