CN110444382A - Bonded permanent magnet and preparation method thereof - Google Patents
Bonded permanent magnet and preparation method thereof Download PDFInfo
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- CN110444382A CN110444382A CN201910641768.XA CN201910641768A CN110444382A CN 110444382 A CN110444382 A CN 110444382A CN 201910641768 A CN201910641768 A CN 201910641768A CN 110444382 A CN110444382 A CN 110444382A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- 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
- H01F1/04—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 metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0558—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together bonded together
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- 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
- H01F1/04—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 metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0578—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- 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
- H01F1/04—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 metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2
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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
- H01F41/026—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 protecting methods against environmental influences, e.g. oxygen, by surface treatment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The present invention provides a kind of bonded permanent magnets and preparation method thereof.The preparation method includes: that processing is pressed using magnetic powder and adhesive as raw material, obtains green body；Pre-add heat treatment is carried out to green body；Heating and vacuumize process are carried out to the green body being heat-treated through pre-add, so that adhesive forms coating in billet surface, obtain bonded permanent magnet, wherein the temperature of heating process is higher than the fusing point of adhesive.Be using coating made from the application and magnet and adhesive it is integrated, there is no the interfaces between magnet coating and magnet.Compared to existing coating, the problem of coating stripping is not likely to produce using coating made from above-mentioned preparation method, thus the antiseptic property of coating can be more preferable.In addition, the material that the process and magnet solidification process that coating is formed carry out simultaneously, and form coating is also a part of adhesive, and the process costs and material cost of coating preparation process can be greatly lowered in this in above-mentioned preparation method.
Description
Technical field
The present invention relates to magnet preparation fields, in particular to a kind of bonded permanent magnet and preparation method thereof.
Background technique
The bonded neodymium-iron-boron magnet of compression moulding usually requires to apply magnet coating in magnet surface to reach erosion-resisting
Purpose.Common magnet coating process includes electrophoretic coating, powder coating, electroplated coating and physical/chemical depositing coating.It is common
Coating material include epoxy resin, fluoro containing polymers resin, polyester resin, polyamide, polyacrylic resin and poly-
The organic resin of paraxylene and carbon etc., the metal coatings such as nickel, chromium and aluminium and the ceramic coatings such as silica and aluminium oxide.
The coating for being applied to compacting bonded neodymium-iron-boron magnet at present has following deficiency:
No matter which kind of above-mentioned coating process and coating material are used, since coating is applied to after magnet curing molding
Magnet outer surface, so centainly will form the interface between coating and magnet surface.On this interface, inevitably have
The presence of impurity or defect.Under conditions of high temperature or high humility, these defects can promote to generate local corrosion, and then lead
Cause the removing and breakage of coating.
Since magnet coating needs to apply after magnet curing molding, magnet coating process increase the technique of magnet at
Sheet and material cost.
Summary of the invention
The main purpose of the present invention is to provide a kind of bonded permanent magnets and preparation method thereof, to solve existing magnet coating
The problem of coating corrosion resistance difference existing for preparation process.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of preparation method of bonded permanent magnet, is somebody's turn to do
Preparation method includes: that processing is pressed using magnetic powder and adhesive as raw material, obtains green body；Green body is preheated
Processing；Heating and vacuumize process are carried out to the green body being heat-treated through pre-add, so that adhesive forms coating in billet surface, obtained
To bonded permanent magnet, wherein the temperature of heating process is higher than the fusing point of adhesive.
Further, before processing is pressed, above-mentioned preparation method further include: by magnetic powder, adhesive and profit
Lubrication prescription mixing, obtains raw material；Preferably, lubricant is in the group that zinc stearate, polytetrafluoroethylene (PTFE) and calcium stearate form
It is one or more.
Further, in raw material, the weight ratio of magnetic powder, adhesive and lubricant is (90~95): (3~7): (0~1).
Further, adhesive is selected from one of epoxyn, silica resin and group of phenolic resin composition
Or it is a variety of.
Further, the temperature of pre-add heat treatment process is 150~230 DEG C, and heating time is 3~10min.
Further, with during vacuumize process, temperature is 150~230 DEG C for heating, and vacuum degree is 1 × 10-7~3 ×
103Pa, processing time are 10~60min.
Further, the typed pressure of pressing process is 1.5~10t/cm2, the pressing time is 0.1~2min.
Further, magnetic powder be selected from FeNdB magnetic powder, SmCo and SmFeN at one of group or a variety of.
Further, the granularity of magnetic powder is less than 40 mesh.
The another aspect of the application additionally provides a kind of bonded permanent magnet, and bonded permanent magnet is made using above-mentioned preparation method.
It applies the technical scheme of the present invention, makes the adhesive in green body in flow regime by preheating process, it is then sharp
Part adhesive is covered uniformly under vacuum degree condition with flowing of the adhesive in magnet solidification process and curing characteristics
Cover the coating that magnet is formed in magnet surface.Be using coating made from the application and magnet and adhesive it is integrated, do not deposit
Interface between magnet coating and magnet.Compared to existing coating, it is not likely to produce using coating made from above-mentioned preparation method
The problem of coating stripping, thus the antiseptic property of coating can be more preferable.In addition, in above-mentioned preparation method, process that coating is formed and
Magnet solidification process carries out simultaneously, and the material for forming coating is also a part of adhesive, and coating can be greatly lowered in this
The process costs and material cost of preparation process.On this basis, not only had using bonded permanent magnet made from above-mentioned preparation method
There is preferable corrosion resistance, also has the advantages that painting cost and preparation cost are low etc..
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is shown in the bonded permanent magnet preparation method that a kind of typical embodiment according to the present invention provides, magnetic powder
With the initial mixing status diagram of adhesive；And
Fig. 2 shows in the bonded permanent magnet preparation method provided according to a preferred embodiment of the present invention, gluing
The schematic diagram of the generation melt-flow of agent；
Fig. 3 is shown in the bonded permanent magnet preparation method provided according to a preferred embodiment of the present invention, bonding
The structural schematic diagram of magnet；
Fig. 4 a shows the coating coating situation of bonded permanent magnet obtained in the embodiment of the present invention 1；
Fig. 4 b shows the anticorrosive result of the coating of bonded permanent magnet obtained in the embodiment of the present invention 1；
Fig. 5 a shows the coating coating situation of bonded permanent magnet obtained in the embodiment of the present invention 2；
Figure 5b shows that the anticorrosive results of the coating of bonded permanent magnet obtained in the embodiment of the present invention 2；
Fig. 6 a shows the coating coating situation of bonded permanent magnet obtained in the embodiment of the present invention 3；
Fig. 6 b shows the anticorrosive result of the coating of bonded permanent magnet obtained in the embodiment of the present invention 3；
Fig. 7 a shows the coating coating situation of bonded permanent magnet obtained in the embodiment of the present invention 4；
Fig. 7 b shows the anticorrosive result of the coating of bonded permanent magnet obtained in the embodiment of the present invention 4；
Fig. 8 a shows the reference substance for not carrying out corrosion resistance test in comparative example 1 of the present invention；
Fig. 8 b shows the anticorrosive test result of the bonded permanent magnet in comparative example 1 of the present invention without corrosion-inhibiting coating.
Wherein, the above drawings include the following reference numerals:
10, magnetic powder；20, adhesive；30, hole.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.Below in conjunction with embodiment, the present invention will be described in detail.
As described in background technique, there is coating corrosion resistance difference in existing magnet preparation technology of coating.
In order to solve the above-mentioned technical problem, this application provides a kind of preparation method of bonded permanent magnet, which includes: with magnetic powder
Processing is pressed as raw material with adhesive, obtains green body；Pre-add heat treatment is carried out to green body；It is heat-treated to through pre-add
Green body carry out heating and vacuumize process so that adhesive billet surface formed coating, obtain bonded permanent magnet, wherein add
The temperature of thermal process is higher than the fusing point of adhesive.
Make the adhesive in green body in flow regime by preheating process, then using adhesive in magnet solidification process
In flowing and curing characteristics so that part adhesive is uniformly covered on magnet surface under vacuum degree condition, form magnet
Coating.Coating made from the application and magnet and adhesive be it is integrated, there is no the interfaces between magnet coating and magnet.
Compared to existing coating, the problem of coating stripping is not likely to produce using coating made from above-mentioned preparation method, thus coating is anti-
Rotten performance can be more preferable.In addition, the process and magnet solidification process that coating is formed carry out simultaneously, and are formed in above-mentioned preparation method
The material of coating is also a part of adhesive, this can be greatly lowered the process costs of coating preparation process and material at
This.On this basis, not only there is preferable corrosion resistance using bonded permanent magnet made from above-mentioned preparation method, also has and applies
Dress up the originally advantages such as low with preparation cost.
It is illustrated in conjunction with Fig. 1 to 3 pairs of above-mentioned preparation method: as shown in Figure 1, there are holes between adjacent magnetic powder 10
30, when magnetic powder 10 and adhesive 20 mix, adhesive 20 is filled in above-mentioned hole 30；Green body after repressed is heated
When, adhesive 20 melts, to generate deformation, and can be flowed in above-mentioned hole 30, as shown in Figure 2；Then
Vacuumize process is carried out to above-mentioned green body, the adhesive 30 of mobility is coated in billet surface, forms coating, completes integration
Coating process, as shown in Figure 3.
In order to further increase the comprehensive performance of bonded permanent magnet, it is preferable that before processing is pressed, above-mentioned system
Preparation Method further include: by magnetic powder, adhesive and mix lubricant, obtain raw material.The addition of lubricant is conducive to improve mixed glue magnetic
The mobility of powder.Simultaneously in actual preparation process, lubricant, which is added, can make the mixed demoulding of glue magnetic powder after pressing more
It is easy.Lubricant can select type commonly used in the art, it is preferable that lubricant includes but is not limited to zinc stearate, polytetrafluoro
One of group of ethylene and calcium stearate composition is a variety of.
It should be noted that binder can be with the common type in anthology field, such as epoxy resin tackifier and silicon oxygen tree
Rouge.Epoxy resin tackifier generally includes epoxy resin, curing agent and curing accelerator composition.And silica resin is then not necessarily to
Curing agent and promotor.Curing accelerator and lubricant can use lubricant commonly used in the art.Preferably, lubricant is
Zinc stearate, curing accelerator are dicy-curing agent.Using the adhesive for containing above two component, be conducive to improve coating
Compactness and final corrosion resistance.
In a kind of preferred embodiment, in raw material, the weight ratio of magnetic powder, adhesive and lubricant is (90~95): (3
~7): (0~1).The weight ratio of magnetic powder, adhesive and lubricant includes but is not limited to above range, and is limited to above-mentioned
The porosity of the coating of bonded permanent magnet surface formation is advantageously reduced in range, and then is conducive to further increase bonded permanent magnet
Corrosion resistance；The demolding performace of bonded permanent magnet can also be further increased simultaneously.The weight of above-mentioned magnetic powder, adhesive and lubricant
Than that can be 94.68:5.12:0.2,95:4:1 etc..
In above-mentioned preparation method, when the temperature of heating process is higher than the fusing point of adhesive, adhesive can be made to occur molten
Melt, and then can be realized under the effect of external force, adhesive coated is formed into coating on the surface of bonded permanent magnet.In the application only
The temperature of heating process is wanted to be not particularly limited, as long as can be realized above-mentioned purpose.Preferably, pre-add heat treatment process
Temperature is 150~230 DEG C, and heating time is 3~10min.Compared to other ranges, by the temperature of pre-add heat treatment process and when
Between limit be conducive within the above range control adhesive flow rate, improve the coating quality of coating, so be conducive into
One step improves the comprehensive performances such as the corrosion resistance of bonded permanent magnet.Above-mentioned pre-heating temperature can be selected as 150 DEG C, 160 DEG C, 170 DEG C,
180 DEG C, 200,230 DEG C etc..
In a kind of preferred embodiment, during vacuumize process, the temperature of heating and vacuumize process process is 150
~230 DEG C, vacuum degree 1 × 10-7~3 × 103Pa, processing time are 10~60min.Above-mentioned vacuum degree can be selected as 1 × 10-2、
1、1×102、1×103Pa etc., heating temperature can be selected as 150 DEG C, 160 DEG C, 170 DEG C, 180 DEG C, 200,230 DEG C etc..Compared to
Other ranges are conducive to the restriction of the temperature and time and vacuum degree of heating and vacuumize process process within the above range into one
Step improves the coating quality of coating, improves the comprehensive performances such as the corrosion resistance of bonded permanent magnet.
In above-mentioned preparation method, pressing process can use technique commonly used in the art.In a kind of preferred embodiment,
The typed pressure of pressing process is 1.5~10t/cm2, the pressing time is 0.1~2min.Compared to other process conditions, will press
The typed pressure of process processed and pressing time limit the mouldability for being conducive to improve blank within the above range, and then are conducive to glue
Tie the mechanical properties such as the intensity of magnet.Above-mentioned pressing pressure can be 1.5,3,5,7,9,10t/cm2。
In the preparation method of above-mentioned bonded permanent magnet, the type of magnetic powder is not specifically limited.In a kind of preferred embodiment,
Magnetic powder includes but is not limited to one of group of FeNdB magnetic powder, SmCo and SmFeN composition or a variety of.
Since adhesive is filled in the hole formed between magnetic powder, thus granularity of magnet powder also has the performance of bonded permanent magnet
Certain influence.In a kind of preferred embodiment, the granularity of magnetic powder is less than 40 mesh.The granularity of magnetic powder include but is not limited on
Range is stated, and is limited the binding force for being conducive to further increase within the above range between magnetic powder, adhesive and coating,
And then be conducive to further increase the anti-strip ability of coating and the corrosion resistance of bonded permanent magnet.
In a kind of preferred embodiment, above-mentioned preparation method further includes the time of heating process Yu vacuumize process process
Interval >=5min.Be conducive to heating process and vacuumize process process setting certain time interval to keep adhesive sufficiently molten
Melt, and then shortens the film formation time of coating, while process costs and cost of material can also be saved.
The another aspect of the application additionally provides a kind of bonded permanent magnet, and bonded permanent magnet is made using above-mentioned preparation method.
Using flowing of the adhesive in magnet solidification process and curing characteristics, in the shadow of exterior power (such as vacuum degree)
Under sound, part adhesive is made to be uniformly covered on magnet surface, forms the coating of magnet.It is applied compared to made from existing method
Layer, be using coating made from the application and magnet and adhesive it is integrated, there is no the boundaries between magnet coating and magnet
Face.Compared to existing coating, coating stripping will not be led to the problem of using coating made from above-mentioned preparation method, thus coating
Antiseptic property can be more preferable.In addition, the process and magnet solidification process that coating is formed carry out simultaneously, and shape in above-mentioned preparation method
Material at coating is also a part of adhesive, this can be greatly lowered the process costs of coating preparation process and material at
This.On this basis, not only there is preferable corrosion resistance using bonded permanent magnet made from above-mentioned preparation method, also has and applies
Dress up the originally advantages such as low with preparation cost.
The application is described in further detail below in conjunction with specific embodiment, these embodiments should not be understood as limitation originally
Apply for range claimed.
Embodiment 1
Mix the raw material of magnetic powder are as follows: the content 94.68% (weight percent) of FeNdB magnetic powder, granularity are less than 90 mesh；It is viscous
Knot agent be epoxy resin tackifier (with account for mixing magnetic powder weight comprising 5% epoxy resin, 0.11%
Dicy-curing agent and 0.01% curing accelerator DMP30)；Zinc stearate is lubricant, and content is 0.2% (weight percent
Than).
The compression moulding on press by above-mentioned raw materials, obtains blank, and wherein typed pressure is 7t/cm2, formed body is diameter
9.5mm, the cylindrical body of height 6.3mm.
Above-mentioned blank is put into 180 DEG C of vacuum drying ovens, after heating 5min, starts vacuum pump, carries out vacuumize process, obtain
To required bonded permanent magnet, the wherein vacuum degree 1 × 10 of vacuumize process process-2Pa, processing time are 25min.The painting of coating
It covers situation and sees Fig. 4 a.
Performance test:
Above-mentioned magnet is subjected to anticorrosive experiment, anticorrosive experiment condition: 121 DEG C；2bar；100%RH；96h.Test knot
Fruit sees Fig. 4 b.
Embodiment 2
The difference of embodiment 1 are as follows:
The vacuum degree of vacuumize process process is 3.5 × 103~4 × 103Pa, processing time are 10min.The coating of coating
Situation is shown in Fig. 5 a.
For the test method of corrosion resistance with embodiment 1, test result is shown in Fig. 5 b.
Embodiment 3
The difference of embodiment 1 are as follows:
Above-mentioned blank is put into 150 DEG C of vacuum drying ovens, after heating 10min.
The coating situation of coating is shown in Fig. 6 a, and for the test method of corrosion resistance with embodiment 1, test result is shown in Fig. 6 b.
Embodiment 4
The difference of embodiment 1 are as follows:
Curing agent content in binder is 0.24% (weight percent), and without adding curing agent accelerator.
The coating situation of coating is shown in Fig. 7 a, and for the test method of corrosion resistance with embodiment 1, test result is shown in Fig. 7 b.
Comparative example 1
With the difference of embodiment 1 are as follows: without heating and vacuum pumping, bonded permanent magnet is made.The survey of corrosion resistance
For method for testing with embodiment 1, test result is shown in Fig. 8 b (Fig. 8 a is the reference substance for not carrying out corrosion resistance test).
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
Under the same conditions, the corrosion resistance of the bonded permanent magnet it can be seen from Fig. 8 b without containing corrosion-inhibiting coating is excessively poor,
Can be seen that simultaneously as Fig. 4 a to 7b uses bonded permanent magnet made from preparation method provided by the present application with higher anticorrosive
Performance.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of preparation method of bonded permanent magnet, which is characterized in that the preparation method includes:
Processing is pressed using magnetic powder and adhesive as raw material, obtains green body；
Pre-add heat treatment is carried out to the green body；
Heating and vacuumize process are carried out to the green body being heat-treated through the pre-add, so that the adhesive is in the billet surface
Coating is formed, the bonded permanent magnet is obtained, wherein the temperature of the heating process is higher than the fusing point of the adhesive.
2. preparation method according to claim 1, which is characterized in that described before carrying out the compression moulding processing
Preparation method further include: by magnetic powder, adhesive and mix lubricant, obtain the raw material；
Preferably, the lubricant is selected from one of group of zinc stearate, polytetrafluoroethylene (PTFE) and calcium stearate composition or a variety of.
3. preparation method according to claim 2, which is characterized in that in the raw material, the magnetic powder, the adhesive and
The weight ratio of the lubricant is (90~95): (3~7): (0~1).
4. preparation method according to claim 1, which is characterized in that the adhesive is selected from epoxyn, silicon
One of group of oxygen resin and phenolic resin composition is a variety of.
5. preparation method according to any one of claim 1 to 4, which is characterized in that the pre-add heat treatment process
Temperature is 150~230 DEG C, and heating time is 3~10min.
6. preparation method according to claim 1, which is characterized in that during the heating and vacuumize process, temperature
It is 150~230 DEG C, vacuum degree is 1 × 10-7~3 × 103Pa, processing time are 10~60min.
7. preparation method according to claim 5, which is characterized in that the typed pressure of the pressing process be 1.5~
10t/cm2, the pressing time is 0.1~2min.
8. preparation method according to claim 5, which is characterized in that the magnetic powder be selected from FeNdB magnetic powder, SmCo and
SmFeN at one of group or a variety of.
9. preparation method according to claim 8, which is characterized in that the granularity of the magnetic powder is less than 40 mesh.
10. a kind of bonded permanent magnet, which is characterized in that the bonded permanent magnet is using preparation described in any one of claims 1 to 9
Method is made.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111508699A (en) * | 2020-04-21 | 2020-08-07 | 东莞市南祥磁电科技有限公司 | Method for reprocessing magnetic core powder after compression molding |
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| CN108063037A (en) * | 2016-11-07 | 2018-05-22 | 北京中科三环高技术股份有限公司 | A kind of multi-pole magnet-ring of anisotropic bond neodymium iron boron and preparation method thereof |
| CN109872856A (en) * | 2018-10-29 | 2019-06-11 | Neo新材料技术（新加坡）私人有限公司 | Mixed rubber magnetic powder and preparation method thereof |
| CN109698067A (en) * | 2019-01-14 | 2019-04-30 | 太原开元智能装备有限公司 | The manufacturing method of anisotropic bonded magnet |
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| CN111508699A (en) * | 2020-04-21 | 2020-08-07 | 东莞市南祥磁电科技有限公司 | Method for reprocessing magnetic core powder after compression molding |
| CN111508699B (en) * | 2020-04-21 | 2022-06-10 | 东莞市南祥磁电科技有限公司 | Method for reprocessing magnetic core powder after compression molding |
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Application publication date: 20191112 |