CN106340366A - Rare earth permanent magnetic granules for injection molding, and preparation method of rare earth permanent magnetic granules - Google Patents
Rare earth permanent magnetic granules for injection molding, and preparation method of rare earth permanent magnetic granules Download PDFInfo
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- CN106340366A CN106340366A CN201610781796.8A CN201610781796A CN106340366A CN 106340366 A CN106340366 A CN 106340366A CN 201610781796 A CN201610781796 A CN 201610781796A CN 106340366 A CN106340366 A CN 106340366A
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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
- H01F1/0572—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 with a protective layer
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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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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Hard Magnetic Materials (AREA)
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Abstract
The invention discloses rare earth permanent magnetic granules for injection molding, prepared by carrying out mixing granulation on the following components by mass percent: 85-94% of rare earth permanent magnetic powder, 5-14% of resin, 0.1-1% of amorphous silica, 0.1-1% of a coupling agent and 0.1-1% of a lubricating agent. The invention also discloses a preparation method of the rare earth permanent magnetic granules for injection molding. The method comprises the steps of preparing an ethanol solution of the amorphous silica, carrying out oxidation treatment on magnetic powder silicon, treating magnetic powder in a coupling way, mixing the powder and granulating after adding the resin and the lubricating agent, and the like. After the method is adopted, the high-temperature oxidation resistance, high-humidity weather fastness and magnetic property of the rare earth permanent magnetic powder can be improved, so that the application scopes of the rare earth permanent magnetic granules for injection molding and products of the rare earth permanent magnetic granules are expanded.
Description
Technical field
The present invention relates to a kind of magnetic material and related manufacturing processes, more specifically, it relates to a kind of injection rare earth is forever
Magnetic particulate material and preparation method thereof.
Background technology
Bonded permanent magnet is that Magnaglo is uniformly mixed with binding agents such as resin, rubber or low-melting-point metals, then with injection
The polymer matrix composite permanent-magnetic material that the methods such as shaping, compression molding or extrusion molding are made, is one of permanent-magnet material weight
Want branch.Injection moulding is by the powder mixing of magnetic and resin, granulation, in particulate material injection injection machine after then granulating
Heating fusing, is allowed to there is good mobility, in this state with molten condition injection, this particulate material is had orientation magnetic
In the metal die of field, form the magnet product of required complicated shape after cooling.Compared to general compression molding, it is molded into
The advantage of type has:
The resin content of particulate material reaches 7%～20%, and is molded under particulate material molten condition, and good fluidity, intensity are higher；
The shaping free degree is high, can be made into product complex-shaped, in irregular shape, and is not required to the anti-oxidation measures such as spraying；
Can be molded into axle etc. and inlay class product, and it is very high to inlay class product requirement magnet strength；
Briquetting pressure is low, and mould loss is low, in the temperature profile higher than melting point resins such as nylon, pps during injection mo(u)lding, and is molded
Shaping is generally normal temperature, and mould loss is larger；
At this stage, injection molded magnets be generally divided into injection permanent magnetic ferrite magnet, injection isotropism neodymium iron boron magnetic body, injection each to
Different in nature neodymium iron boron magnetic body, injection smfen magnet and injection built-up magnet etc..Wherein injection rare earth permanent magnet magnet is due to magnetic property
High, product volume is little etc., and factor is widely used, such as high-end electric motor of automobile, new forms of energy power vehicle water pump rotor etc..
Currently, there is some subject matter in injection rare earth permanent magnet particulate material: first, due to rare earth permanent magnet (mainly include ndfeb,
Smfen being) metal material, being easy to aoxidize, thus have impact on the magnetic of particulate material under 220 DEG C -350 DEG C of prilling temperature
Performance；Second, in use, as in hot environment, water environment, (as water pump rotor) all can lead to be molded rare earth permanent magnet system
The problems such as product aoxidize, get rusty, thus leverage service life.
Inventing of Publication No. cn1353428 discloses a kind of iron system containing rare earth element on June 12nd, 2002
Magnetic iron powder and the resin composition for bonded magnet using this magnetic iron powder and binding magnet and densification magnet, it is using by making to contain
The iron based magnet powder of rare earth element is pulverized in organic solvent in the presence of phosphoric acid and is obtained high-weatherability magnetic iron powder, thus
Reach against weather excellent, and coercivity can be suppressed under humidity environment to decline.But this invention is by generating phosphate quilt
Film improving the against weather of material, rather than by improveing what component was realized, therefore for injection rare earth permanent magnet material
For material, reference is little.
Content of the invention
The granulation process of existing injection rare earth permanent magnet particulate material leads to lanthanon permanent magnetic powder to aoxidize because of temperature Gao Erhui,
The product that injection is formed also easily is aoxidized, gets rusty being contacted with the sky medium such as gas and water using process, thus causing under properties of product
Fall, the lost of life, for overcoming these defects, the invention provides a kind of injection rare earth permanent magnet particulate material and preparation method, can
Improve high-temperature oxidation resistance, high humidity against weather and the magnetic property of lanthanon permanent magnetic powder, widen injection rare earth permanent magnet particulate material
And the range of application of product.
The technical scheme is that a kind of injection rare earth permanent magnet particulate material, by the material of following constituent mass percentage
Material mixing granulation is made: lanthanon permanent magnetic powder 85%-94%, resin 5%-14%, amorphous silica 0.1%-1%, coupling agent
0.1%-1%, lubricant 0.1%-1%.During these material mixing granulations, amorphous silica is uniformly deposited at rare earth permanent magnet magnetic
Powder surface, then by action of coupling agents carry out couplingization surface treatment, can be combined well with resin, thus well every
The absolutely contact with media such as sky gas and waters for the lanthanon permanent magnetic powder, greatly optimizes magnetic property and the service life of particulate material.
Preferably, described lanthanon permanent magnetic powder content is 87%-92%.Lanthanon permanent magnetic powder content controls interval at this
Magnetic property, the optimum value of particulate material mobility can be reached.
Preferably, described lanthanon permanent magnetic powder be isotropism ndfeb magnetic or anisotropy ndfeb magnetic or each to
Different in nature smfen magnetic.Isotropism ndfeb magnetic, anisotropy ndfeb magnetic, anisotropy smfen magnetic are on the market relatively
For conventional rare earth permanent-magnetic material, market application maturity height, the source of goods is stable, purchase channel width, advantage of lower cost.
Preferably, described resin content is 7%-12%.Resin content control this interval can reach magnetic property,
The optimum value of pellet mobility.
Preferably, described resin is nylon 12 or pps.The resin content of nylon 12 is in 7wt%-9wt%, magnetic property
Height, can meet the applications such as electric motor of automobile, household electrical appliances motor, sensor sensing magnet ring.Pps can in 200 DEG C of Long-Time Service,
And water absorption rate is extremely low, therefore it is applied to 200 DEG C of high temperature above, the application of dimension precision requirement harshness, at this stage for height
The fields such as end electric motor of automobile, new forms of energy power vehicle water pump rotor, pps is preferable resin material.
Preferably, the content of amorphous silica is 0.2%-0.5%.The content of amorphous silica controls at this
Optimal deposition and anti-agglomeration effect can be reached in individual interval.
Preferably, the content of described coupling agent is 0.3%-0.8%.The content of coupling agent controls permissible in this interval
Produce optimal coupling effect.
Preferably, described coupling agent is silane coupler or titanate coupling agent.Silane coupler or titanate esters are coupled
Agent is coupling agent more typically on the market, and application is ripe, and material is easy to get.
Preferably, the content of lubricant is 0.1%-0.5%, lubricant is zinc stearate or calcium stearate or ebs or silicon
Oil.Zinc stearate, calcium stearate, ebs, silicone oil are all the satisfactory lubricants of physicochemical property, and the content of lubricant controls
Optimal lubricant effect can be produced in this interval.
A kind of described injection preparation method of rare earth permanent magnet particulate material, comprises the steps:
1) prepare the ethanol solution of amorphous silica: be raw material using sodium metasilicate and ammonium chloride, be added to ethanol and water body
In the solution of 8:1, ph controls in 8-9 long-pending ratio, can go out amorphous silica with chemical precipitation, is then peeled off precipitation and solution
Afterwards, rapidly join ethanol solution to prevent silica from reuniting；
2) magnetic silicon oxidation processes: by 100kg lanthanon permanent magnetic powder in mixed powder cylinder, the amorphous dioxy for preparing before addition
The ethanol solution of SiClx, fully stirs evenly, and mixes powder 18-22min in 100 DEG C -120 DEG C of temperature, doing to ethanol volatilization；Then
It is placed in heat treatment 55-65min in 390-410 DEG C of vacuum drying oven, complete magnetic surface siliconization；
3) magnetic couplingization is processed: adds the coupling agent being dissolved in isopropanol, mixes powder 18- at a temperature of 100 DEG C -120 DEG C
22min；
4) add resin, continue mixed powder 13-17min in 100 DEG C -120 DEG C of temperature；
5) add lubricant, continue mixed powder 13-17min in 100 DEG C -120 DEG C of temperature, and temperature is risen to 140 DEG C -160 DEG C,
Continue mixed powder 13-17min；
6) granulate, by the resin of above-mentioned mixing-lanthanon permanent magnetic powder mixture injection comminutor, prilling temperature control 200 DEG C-
330℃.
Adopt amorphous silica with the injection rare earth permanent magnet particulate material of the method preparation, lanthanon permanent magnetic powder is entered
Row silicon oxidation processes, thus solve injection rare earth permanent magnet particulate material easily aoxidizing in high temperature granulation process, injection-molded item makes
With during the problems such as the environment such as high temperature, low temperature, high humidity easy oxidation and rusting.
The invention has the beneficial effects as follows:
Improve injection rare earth permanent magnet particulate material performance.The present invention prepares amorphous when preparing injection rare earth permanent magnet particulate material
The ethanol solution of silica, then homogeneous precipitation, in lanthanon permanent magnetic powder surface so that magnetic reaches silicon oxidation, greatly changes
It is apt to high-temperature oxidation resistance, high humidity against weather and the magnetic property of this lanthanon permanent magnetic powder.
Widen injection rare earth permanent magnet particulate material and the range of application of product.Because the present invention preferably solves at this stage
The oxidation of lanthanon permanent magnetic powder when high temperature granulation, high-temperature injection, the problems such as aoxidizing, get rusty, opens up during product use well
The wide range of application with rare earth permanent magnet particulate material and product for the injection, particularly in electronic water pump neck fast-developing at this stage
Domain, the solution of the problems referred to above.
Specific embodiment
With reference to specific embodiment, the invention will be further described.
Embodiment 1:
A kind of injection uses rare earth permanent magnet particulate material, by 100kg isotropism ndfeb magnetic, 11kgpps, 0.30kg amorphous two
Silica, 0.80kg silane coupler, 0.3kg make as the silicone oil of lubricant, mixing granulation.
Prepare by the following method:
Prepare the ethanol solution of amorphous silica: be raw material using 0.61kg sodium metasilicate and 0.54kg ammonium chloride, be added to
In the solution of ethanol and water volume ratio 8:1, ph controls 8, can go out amorphous silica with chemical precipitation, be then peeled off precipitating
And after solution, the ethanol solution rapidly joining 5l is to prevent silica from reuniting；
Magnetic silicon oxidation processes: by 100kg lanthanon permanent magnetic powder in mixed powder cylinder, the amorphous titanium dioxide for preparing before addition
The ethanol solution of silicon, fully stirs evenly, and mixes powder 20min in 120 DEG C of temperature, doing to ethanol volatilization；It is subsequently placed in 400 DEG C very
In empty stove, heat treatment 60min, completes magnetic surface siliconization；
Magnetic couplingization is processed: adds silane coupler 0.80kg, silane coupler is dissolved in 3l isopropanol, in 120 DEG C of temperature
The mixed powder 20min of degree；
Add the pps resin of 11kg, continue mixed powder 15min in 120 DEG C of temperature；
Add 0.3kg silicone oil as lubricant, continue mixed powder 15min in 120 DEG C of temperature, and temperature is risen to 140 DEG C, continue
Mixed powder 15min；
Granulation, by the resin of above-mentioned mixing-lanthanon permanent magnetic powder mixture injection comminutor, prilling temperature controls at 320 DEG C.
Meanwhile, carry out a contrast experiment parallel as comparative example 1, comparative example 1 only lanthanon permanent magnetic powder is provided without silicon
Oxidation processes, remaining is identical with the present embodiment.
Verification test, the magnetic property of particulate material, injection rotor device table magnetic (normal temperature), injection rotor device table magnetic (-
1h+120 DEG C of * 1h of 40 DEG C of *, totally 40 circulation thermocyclings after) etc. results of property be shown in Table 1.
Embodiment 2:
Rare earth permanent magnet particulate material is used in a kind of injection, and by 100kg anisotropy ndfeb magnetic, 7.5kg nylon 12,0.50kg is no fixed
Shape silica, 0.80kg silane coupler, 0.3kg make as the ebs of lubricant, mixing granulation.
Prepare by the following method:
1) prepare the ethanol solution of amorphous silica: be raw material using 1.02kg sodium metasilicate and 0.89kg ammonium chloride, add
To in the solution of ethanol and water volume ratio 8:1, ph controls 8.3, can go out amorphous silica with chemical precipitation, be then peeled off
After precipitation and solution, the ethanol solution rapidly joining 5l is to prevent silica from reuniting；
2) magnetic silicon oxidation processes: by 100kg lanthanon permanent magnetic powder in mixed powder cylinder, the amorphous dioxy for preparing before addition
The ethanol solution of SiClx, fully stirs evenly, and mixes powder 22min in 100 DEG C of temperature, doing to ethanol volatilization；It is subsequently placed in 398 DEG C
In vacuum drying oven, heat treatment 63min, completes magnetic surface siliconization；
3) magnetic couplingization is processed: adds 0.80kg silane coupler, silane coupler is dissolved in 3l isopropanol, in 100 DEG C of temperature
The mixed powder 22min of degree；
4) add nylon 12 resin of 7.5kg, continue mixed powder 17min in 100 DEG C of temperature；
5) add 0.3kg lubricant ebs, continue mixed powder 17min in 100 DEG C of temperature, and temperature is risen to 140 DEG C, continue mixed
Powder 17min；
6) granulate, by the resin of above-mentioned mixing-lanthanon permanent magnetic powder mixture injection comminutor, prilling temperature controls at 240 DEG C.
Verification test, the magnetic property of particulate material, injection rotor device table magnetic (normal temperature), injection rotor device table magnetic (-
1h+120 DEG C of * 1h of 40 DEG C of *, totally 40 circulation thermocyclings after) etc. results of property be shown in Table 1.
Embodiment 3:
Rare earth permanent magnet particulate material is used in a kind of injection, and by 100kg anisotropy smfen magnetic, 8kg nylon 12,0.40kg is amorphous
Silica, 0.80kg titanate coupling agent, 0.3kg make as the zinc stearate of lubricant, mixing granulation.
Prepare by the following method:
1) prepare the ethanol solution of amorphous silica: be raw material using 0.81kg sodium metasilicate and 0.71kg ammonium chloride, add
To in the solution of ethanol and water volume ratio 8:1, ph controls 8.7, can go out amorphous silica with chemical precipitation, be then peeled off
After precipitation and solution, the ethanol solution rapidly joining 5l is to prevent silica from reuniting；
2) magnetic silicon oxidation processes: by 100kg lanthanon permanent magnetic powder in mixed powder cylinder, the amorphous dioxy for preparing before addition
The ethanol solution of SiClx, fully stirs evenly, and mixes powder 21min in 110 DEG C of temperature, doing to ethanol volatilization；It is subsequently placed in 402 DEG C
In vacuum drying oven, heat treatment 58min, completes magnetic surface siliconization；
3) magnetic couplingization is processed: adds titanate coupling agent 0.80kg, titanate coupling agent silane coupler is dissolved in 3l isopropyl
Alcohol, mixes powder 21min in 110 DEG C of temperature；
4) add the nylon 12 of 8kg, continue mixed powder 14min in 110 DEG C of temperature；
5) add 0.3kg lubricant stearic acid zinc, continue mixed powder 14min in 120 DEG C of temperature, and temperature is risen to 150 DEG C, continue
Continuous mixed powder 16min；
6) granulate, by the resin of above-mentioned mixing-lanthanon permanent magnetic powder mixture injection comminutor, prilling temperature controls at 200 DEG C.
Meanwhile, carry out a contrast experiment parallel as comparative example 2, comparative example 2 only lanthanon permanent magnetic powder is provided without silicon
Oxidation processes, remaining is identical with the present embodiment.
Verification test, the magnetic property of particulate material, injection rotor device table magnetic (normal temperature), injection rotor device table magnetic (-
1h+120 DEG C of * 1h of 40 DEG C of *, totally 40 circulation thermocyclings after) etc. results of property be shown in Table 1.
Embodiment 4:
Rare earth permanent magnet particulate material is used in a kind of injection, and by 100kg anisotropy smfen magnetic, 8kg nylon 12,0.40kg is amorphous
Silica, 0.80kg titanate coupling agent, 0.3kg as lubricant calcium stearate as lubricant, mixing granulation is made.
Prepare by the following method:
1) prepare the ethanol solution of amorphous silica: be raw material using 0.81kg sodium metasilicate and 0.71kg ammonium chloride, add
To in the solution of ethanol and water volume ratio 8:1, ph controls 9, can go out amorphous silica with chemical precipitation, be then peeled off sinking
Behind shallow lake and solution, the ethanol solution rapidly joining 5l is to prevent silica from reuniting；
2) magnetic silicon oxidation processes: by 100kg lanthanon permanent magnetic powder in mixed powder cylinder, the amorphous dioxy for preparing before addition
The ethanol solution of SiClx, fully stirs evenly, and mixes powder 18min in 118 DEG C of temperature, doing to ethanol volatilization；It is subsequently placed in 400 DEG C
In vacuum drying oven, heat treatment 60min, completes magnetic surface siliconization；
3) magnetic couplingization is processed: adds 0.80kg titanate coupling agent, titanate coupling agent is dissolved in 3l isopropanol, at 120 DEG C
Temperature mix powder 18min；
4) add the nylon 12 of 8kg, continue mixed powder 13min in 119 DEG C of temperature；
5) add 0.3kg lubricant stearic acid calcium as lubricant, continue mixed powder 13min in 118 DEG C of temperature, and by temperature liter
To 160 DEG C, continue mixed powder 13min；
6) granulate, by the resin of above-mentioned mixing-lanthanon permanent magnetic powder mixture injection comminutor, prilling temperature controls at 330 DEG C.
Verification test, the magnetic property of particulate material, injection rotor device table magnetic (normal temperature), injection rotor device table magnetic (-
1h+120 DEG C of * 1h of 40 DEG C of *, totally 40 circulation thermocyclings after) etc. results of property be shown in Table 1.
Table magnetic property contrast after the magnetic property of table 1 particulate material, injection rotor device normal temperature and thermocycling
| Br, gs | Hcb, oe | Hcj, oe | (bh) max, mgoe | φ 19.99mm rotor device normal temperature table magnetic, gs | Table magnetic after φ 19.99mm rotor device thermocycling, gs | |
| Embodiment 1 | 5010 | 4288 | 8947 | 5.41 | 1603 | 1594 |
| Embodiment 2 | 5620 | 4821 | 8920 | 6.73 | 1781 | 1861 |
| Embodiment 3 | 5850 | 5012 | 9315 | 7.10 | 1858 | 1833 |
| Comparative example 1 | 4754 | 4065 | 7825 | 4.88 | 1502 | 1424 |
| Comparative example 2 | 5680 | 4875 | 8846 | 6.68 | 1801 | 1705 |
Note: thermocycling is 1h+120 DEG C of * 1h of -40 DEG C of *, totally 40 circulations；
From table 1 it follows that the injection rare earth permanent magnet particulate material of the present invention adopts amorphous silica, to rare earth permanent magnet
Magnetic carries out silicon oxidation processes, thus solve injection rare earth permanent magnet particulate material and easily aoxidizing, being molded in high temperature granulation process
During device use the problems such as the environment such as high temperature, low temperature, high humidity easy oxidation and rusting.
By magnetic surface silicon oxidation processes, completely cut off the contact of lanthanon permanent magnetic powder and the media such as empty gas and water well,
Greatly optimize magnetic property and the service life of particulate material, be particularly molded pps-ndfeb system (embodiment 1 and comparative example
1) particulate material (comparative example 1) magnetic property, being provided without silicon oxidation processes is far below the particulate material (embodiment using silicon oxidation processes
1) magnetic property, passes through 1h+120 DEG C of * 1h of -40 DEG C of *, after the thermocycling of totally 40 circulations, the injection rotor table magnetic of embodiment 1
Reduce 9gs, and the injection rotor table magnetic of comparative example 1 reduces 78gs.
Claims (10)
1. rare earth permanent magnet particulate material is used in a kind of injection, it is characterized in that by the material mixing granulation system of following constituent mass percentage
Become: lanthanon permanent magnetic powder 85%-94%, resin 5%-14%, amorphous silica 0.1%-1%, coupling agent 0.1%-1%, lubricant
0.1%-1%.
2. rare earth permanent magnet particulate material is used in injection according to claim 1, it is characterized in that described lanthanon permanent magnetic powder content is
87%-92%.
3. according to claim 1 injection use rare earth permanent magnet particulate material, it is characterized in that described lanthanon permanent magnetic powder for each to
Same sex ndfeb magnetic or anisotropy ndfeb magnetic or anisotropy smfen magnetic.
4. rare earth permanent magnet particulate material is used in injection according to claim 1, it is characterized in that described resin content is 7%-12%.
5. rare earth permanent magnet particulate material is used in injection according to claim 1, it is characterized in that described resin is nylon 12 or pps.
6. rare earth permanent magnet particulate material is used in injection according to claim 1, it is characterized in that the content of amorphous silica is
0.2%-0.5%.
7. rare earth permanent magnet particulate material is used in injection according to claim 1, it is characterized in that the content of described coupling agent is 0.3%-
0.8%.
8. rare earth permanent magnet particulate material is used in injection according to claim 1, it is characterized in that described coupling agent is silane coupler
Or titanate coupling agent.
9. rare earth permanent magnet particulate material is used in injection according to any one of claim 1 to 8, it is characterized in that the content of lubricant
For 0.1%-0.5%, lubricant is zinc stearate or calcium stearate or ebs or silicone oil.
10. the preparation method of rare earth permanent magnet particulate material of the injection described in a kind of claim 1, is characterized in that including walking as follows
Rapid:
1) prepare the ethanol solution of amorphous silica: be raw material using sodium metasilicate and ammonium chloride, be added to ethanol and water body
In the solution of 8:1, ph controls in 8-9 long-pending ratio, can go out amorphous silica with chemical precipitation, is then peeled off precipitation and solution
Afterwards, rapidly join ethanol solution to prevent silica from reuniting；
2) magnetic silicon oxidation processes: by 100kg lanthanon permanent magnetic powder in mixed powder cylinder, the amorphous dioxy for preparing before addition
The ethanol solution of SiClx, fully stirs evenly, and mixes powder 18-22min in 100 DEG C -120 DEG C of temperature, doing to ethanol volatilization；Then
It is placed in heat treatment 55-65min in 390-410 DEG C of vacuum drying oven, complete magnetic surface siliconization；
3) magnetic couplingization is processed: adds the coupling agent being dissolved in isopropanol, mixes powder 18- at a temperature of 100 DEG C -120 DEG C
22min；
4) add resin, continue mixed powder 13-17min in 100 DEG C -120 DEG C of temperature；
5) add lubricant, continue mixed powder 13-17min in 100 DEG C -120 DEG C of temperature, and temperature is risen to 140 DEG C -160 DEG C,
Continue mixed powder 13-17min；
6) granulate, by the resin of above-mentioned mixing-lanthanon permanent magnetic powder mixture injection comminutor, prilling temperature controls 200
℃--330℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108231321A (en) * | 2017-12-20 | 2018-06-29 | 横店集团东磁股份有限公司 | A kind of miniature electronic water pump rotor magnet and preparation method thereof |
| CN111029073A (en) * | 2019-12-27 | 2020-04-17 | 成都银河磁体股份有限公司 | High-resistance magnetic powder, bonded magnet and preparation method thereof |
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|---|---|---|---|---|
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Cited By (2)
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| CN108231321A (en) * | 2017-12-20 | 2018-06-29 | 横店集团东磁股份有限公司 | A kind of miniature electronic water pump rotor magnet and preparation method thereof |
| CN111029073A (en) * | 2019-12-27 | 2020-04-17 | 成都银河磁体股份有限公司 | High-resistance magnetic powder, bonded magnet and preparation method thereof |
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