CN110181040A - A kind of powder metallurgy prepares the lubricant and application method of neodymium iron boron magnetic body - Google Patents
A kind of powder metallurgy prepares the lubricant and application method of neodymium iron boron magnetic body Download PDFInfo
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- CN110181040A CN110181040A CN201910638800.9A CN201910638800A CN110181040A CN 110181040 A CN110181040 A CN 110181040A CN 201910638800 A CN201910638800 A CN 201910638800A CN 110181040 A CN110181040 A CN 110181040A
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- lubricant
- powder
- neodymium iron
- iron boron
- magnetic body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F2003/023—Lubricant mixed with the metal powder
Abstract
The present invention relates to additive for powder metallurgy technical fields, and in particular to a kind of powder metallurgy prepares the lubricant and application method of neodymium iron boron magnetic body, and the lubricant includes solute and solvent, solute be selected from 2- aminobenzothiazole, borate it is one or two kinds of；The mass ratio of one or more of the solvent selected from chloroform, ether and petroleum ether, solute and solvent is 0.5:99.5~5:95；Lubricant prepares the application method in neodymium iron boron magnetic body in powder metallurgy, it include mainly that lubricant is blown into neodymium iron boron mixed powder tank by inert gas, powder is mixed in 3D batch mixer, it mixes, lubricant is evenly coated at particle surface, it is pressed and molded again, high temperature sintering obtains neodymium iron boron magnetic body, lubricant of the present invention can increase the mobility of powder, effectively solve the problems, such as that powder ball is poly-, lubricity is good, and additive amount is few in Nd-Fe-B powder, it can achieve the purpose that lubrication with lesser additive amount, reduce the introducing of harmful element in magnet.
Description
Technical field
The present invention relates to additive for powder metallurgy technical fields, and in particular to a kind of powder metallurgy prepares neodymium iron boron magnetic body use
Lubricant and application method.
Background technique
Powder metallurgy be it is a kind of use the mixture of metal powder or metal powder and non-metal powder as raw material, by
Type and sintering, manufacture the technology of metal material and various product.In order to fine particle preferably merge and green compact it is de-
Mould usually adds lubricant in raw material.Dispersing uniformity of the various lubricants in green compact directly affects stripping result, more
Influence the incomplete rate of green compact.
Functional material of the sintered rare-earth permanent magnetic NdFeB material as a kind of basis, since it is with excellent magnetic property quilt
It is widely used in electric vehicle, hybrid electric vehicle, wind-power electricity generation, convertible frequency air-conditioner, Medical Devices, elevator, stereo set and mineral point
The fields such as choosing.Sintered NdFeB preparation process includes several steps such as melting, powder processed, molding and sintering.In orientation process by
There is different degrees of friction in powder poor fluidity, between particle and particle and particle and mold wall, influences magnetic powder orientation；?
Powder flowbility is poor in forming process, influences density uniformity；Reunited in forming process due to magnetostatic effect, is influenced final
Magnetic property.Lubricant will solve the above problems the following conditions to be met: (1) good fluidity is easier to be uniformly mixed with magnetic powder；
(2) longer time can be maintained at room temperature, reduced frictional force in molding and orientation process, played the role of lubrication；(3) moisten
Lubrication prescription ambient-temp-stable medium temperature is easily decomposed, and in medium temperature, lubricant is easy to decompose the not residual harmful substance in magnet.
Lubricant for powder metallurgy can be divided into metal soap, higher fatty acids, amide and its derivative species and polymerization at present
Species.The most commonly used is zinc stearates in this substance, as Chinese patent CN102672164, Chinese patent CN107952953 are equal
Powder metallurgy lubricant is done using zinc stearate, but it cannot resolve into gaseous material completely during the sintering process and remain gold
The oxide contaminant sintering furnace and part of category.Chinese patent CN102942980, Chinese patent CN104994976 are all made of advanced
Fatty acid, amide and its derivative are combined into lubricant, although this series lubricant agent lubricity is good, the cohesive strength of particle compared with
Greatly, so that mixed powder is likely to occur agglomeration in storing process, the mobility of powder can be reduced.Chinese patent CN1151303, this
Series lubricant agent is heated with can be in the uniform drawout in metal surface, the mostly component part as temperature and pressure lubricant in the presence of viscous state.
Traditional powder metallurgy lubricant is not particularly suited for rare earth permanent-magnetic material, so moistening needed for neodymium iron boron production process in the market
Lubrication prescription type is very few.
Summary of the invention
The present invention develops the lubricant that the novel powder metallurgy of one kind prepares neodymium iron boron magnetic body, it is characterised in that: described
Lubricant includes solute and solvent, solute be selected from 2- aminobenzothiazole, borate it is one or two kinds of；Solvent is selected from trichlorine
The mass ratio of the one or more of methane, ether and petroleum ether, solute and solvent is 0.5:99.5~5:95.
Preferably, when solute is selected from 2- aminobenzothiazole and borate, the matter of 2- aminobenzothiazole and borate
Measuring ratio is 1:1~1:9.
Preferably, when solvent is selected from two kinds or three kinds of chloroform, ether and petroleum ether, every kind of solvent quality phase
Together.
The invention further relates to lubricants described in any of the above embodiments to prepare the purposes in neodymium iron boron magnetic body in powder metallurgy.
Further, the invention further relates to the lubricants prepares the user in neodymium iron boron magnetic body in powder metallurgy
Method, steps are as follows:
(1) lubricant is blown into neodymium iron boron mixed powder tank by inert gas, powder is mixed in 3D batch mixer, until lubricant
It is uniformly mixed with Nd-Fe-B powder, lubricant is evenly coated at particle surface, and the lubricant additive amount is Nd-Fe-B powder quality
0.1~0.5%；
(2) normal orientation forms in Magnetic field press, and in molding pressing process, lubricant uniformly coats neodymium-iron-boron
Powder reduces the frictional force between neodymium iron boron particles in orientation process, improves the degree of orientation；The flowing of powder is improved in forming process
Property, improve green density uniformity；
(3) it is sintered in vacuum sintering furnace, subsequent of continuing rising high-temperature gentle to vacuum degree is kept the temperature between 300~500 DEG C,
It helps lubricant that magnet is effectively discharged, obtains neodymium iron boron magnetic body.
Preferably, the step (1) is mixed powder 3~5 hours in 3D batch mixer.
Preferably, step (1) inert gas is the inert gases such as argon gas, nitrogen.
Benefit effect of the invention is:
(1) lubricant is added after airflow milling, powder machine is mixed by 3D and uniformly mixes lubricant and Nd-Fe-B powder, makes to moisten
Lubrication prescription is uniformly dispersed in magnetic powder, effectively increases the mobility of Nd-Fe-B powder, effectively improves the even density of neodymium iron boron magnetic body
Property；
(2) lubricant lubricity of the invention is good, and additive amount is few in Nd-Fe-B powder, can be reached with lesser additive amount
To the purpose of lubrication, reduce the introducing of harmful element in magnet, improves neodymium iron boron magnetic body remanent magnetism, magnetic energy product and magnet density
While, largely control coercitive loss；
(3) lubricant includes multiple components, and is all fluid organic material, and in medium temperature, each component is respectively in different temperature
Point discharge magnet, reduces inside magnet and the probability of defect occurs；
(4) powder metallurgy that the present invention develops prepares the lubricant of neodymium iron boron magnetic body, can increase the mobility of powder, can have
Effect solves the problems, such as that powder ball is poly-, is suitable for powder metallurgy and is pressed and molded workshop section.
Specific embodiment
The present invention will be further described with reference to the examples below.Described embodiment and its result are merely to illustrate
The present invention, without the present invention described in detail in claims should will not be limited.
Comparative example 1
(1) the neodymium iron boron fine powder of the 50kgN45 trade mark is taken to be put into mixed powder tank for use；(2) by batch can in 3D batch mixer
Mixed powder 3~5 hours；(3) normal orientation forms in Magnetic field press；(4) 300~500 in vacuum sintering furnace sintering process
Heat preservation is gentle to vacuum degree between DEG C, and subsequent high-temperature of continuing rising completes sintering process, takes out after being sintered in sintering furnace and surveys magnetism
Energy.
Embodiment 1
(1) the neodymium iron boron fine powder of the 50kgN45 trade mark is taken to be put into mixed powder tank for use；(2) by 2- aminobenzothiazole and
Chloroform is configured to lubricant according to mass ratio 0.5:99.5；(3) lubricant is blown into mixed powder tank by inert gas, added
Dosage is the 0.25% of Nd-Fe-B powder quality, is mixed in 3D batch mixer powder 3~5 hours, until lubricant and Nd-Fe-B powder mix
Uniformly, lubricant is evenly coated at particle surface；(4) normal orientation forms in Magnetic field press, in molding pressing process, profit
Lubrication prescription uniformly coats NdFeB magnetic powder；Reduce the frictional force between neodymium iron boron particles in orientation process, improves the degree of orientation；It is forming
The mobility for improving powder in the process, improves green density uniformity；(5) it is taken out after being sintered in sintering furnace and surveys magnetic property, vacuum
Heat preservation is gentle to vacuum degree between 300~500 DEG C in sintering furnace sintering process, helps lubricant that magnet is effectively discharged, after
Continue to increase temperature completion sintering process.
Embodiment 2
(1) the neodymium iron boron fine powder of the 50kgN45 trade mark is taken to be put into mixed powder tank for use；(2) 2- aminobenzothiazole and three
Chloromethanes is configured to lubricant according to the mass ratio of 2.5:97.5；(3) lubricant is blown into mixed powder tank by inert gas, added
Dosage is the 0.25% of Nd-Fe-B powder quality, is mixed in 3D batch mixer powder 3~5 hours, until lubricant and Nd-Fe-B powder mix
Uniformly, lubricant is evenly coated at particle surface；(4) normal orientation forms in Magnetic field press, in molding pressing process, profit
Lubrication prescription uniformly coats NdFeB magnetic powder；Reduce the frictional force between neodymium iron boron particles in orientation process, improves the degree of orientation；It is forming
The mobility for improving powder in the process, improves green density uniformity；(5) it is taken out after being sintered in sintering furnace and surveys magnetic property, vacuum
Heat preservation is gentle to vacuum degree between 300~500 DEG C in sintering furnace sintering process, helps lubricant that magnet is effectively discharged, after
Continue to increase temperature completion sintering process.
Embodiment 3
2- aminobenzothiazole and chloroform are configured to lubricate by 1 step of embodiment (2) according to the mass ratio of 5:95
Agent, other steps are the same as embodiment 1.
Embodiment 4
By 1 step of embodiment (2) by 2- aminobenzothiazole, chloroform and ether according to mass ratio 2.5:48.5:49
It is configured to lubricant, other steps are the same as embodiment 1.
Embodiment 5
By 1 step of embodiment (2) by 2- aminobenzothiazole, chloroform and petroleum ether according to mass ratio 2.5:48.5:
49 are configured to lubricant, other steps are the same as embodiment 1.
Embodiment 6
(1) the neodymium iron boron fine powder of the 50kgN45 trade mark is taken to be put into mixed powder tank for use；(2) by borate and ether according to
Mass ratio 0.5:99.5 is configured to lubricant；(3) lubricant is blown into mixed powder tank by inert gas, additive amount is neodymium iron boron
The 0.5% of silty amount mixes powder 3~5 hours in 3D batch mixer, until lubricant and Nd-Fe-B powder are uniformly mixed, lubricant is equal
It is even to be coated on particle surface；(4) normal orientation forms in Magnetic field press, and in molding pressing process, lubricant is uniformly coated
NdFeB magnetic powder；Reduce the frictional force between neodymium iron boron particles in orientation process, improves the degree of orientation；Powder is improved in forming process
Mobility, improve green density uniformity；(5) it is taken out after being sintered in sintering furnace and surveys magnetic property, vacuum sintering furnace is sintered
Heat preservation is gentle to vacuum degree between 300~500 DEG C in journey, helps lubricant that magnet, subsequent high-temperature of continuing rising is effectively discharged
Complete sintering process.
Embodiment 7
Borate and ether are configured to lubricant according to mass ratio 2.5:97.5 by 6 step of embodiment (2), other steps are same
Embodiment 6.
Embodiment 8
Borate and ether are configured to lubricant according to mass ratio 5:95 by 6 step of embodiment (2), other steps are the same as real
Apply example 6.
Embodiment 9
Borate, ether and petroleum ether are configured to lubricate by 6 step of embodiment (2) according to mass ratio 2.5:48.5:49
Agent, other steps are the same as embodiment 6.
Embodiment 10
Borate, ether and chloroform are configured to moisten by 6 step of embodiment (2) according to mass ratio 2.5:48.5:49
Lubrication prescription, other steps are the same as embodiment 6.
Embodiment 11
(1) the neodymium iron boron fine powder of the 50kgN45 trade mark is taken to be put into mixed powder tank for use；(2) by 2- aminobenzothiazole, boron
Acid esters and petroleum ether are configured to lubricant according to mass ratio 0.5:4.5:95；(3) lubricant is blown into mixed powder by inert gas
Batch can, additive amount are the 0.1% of Nd-Fe-B powder quality, are mixed in 3D batch mixer powder 3~5 hours, until lubricant and neodymium iron boron
Powder is uniformly mixed, and lubricant is evenly coated at particle surface；(4) normal orientation forms in Magnetic field press, suppresses in molding
Cheng Zhong, lubricant uniformly coat NdFeB magnetic powder；Reduce the frictional force between neodymium iron boron particles in orientation process, improves orientation
Degree；The mobility that powder is improved in forming process, improves green density uniformity；(5) it is taken out after being sintered in sintering furnace and surveys magnetic
Performance, keeps the temperature in vacuum sintering furnace sintering process gentle to vacuum degree between 300~500 DEG C, and lubricant is helped effectively to arrange
Magnet out, subsequent high-temperature of continuing rising complete sintering process.
Embodiment 12
By 11 step of embodiment (2) by 2- aminobenzothiazole, borate and petroleum ether according to mass ratio 2.5:2.5:95
It is configured to lubricant, other steps are the same as embodiment 11.
Embodiment 13
By in 11 step of embodiment (2) by 2- aminobenzothiazole, borate and ether according to mass ratio 2.5:2.5:95
It is configured to lubricant, other steps are the same as embodiment 11.
Embodiment 14
By in 11 step of embodiment (2) by 2- aminobenzothiazole, borate, chloroform, ether and petroleum ether according to
Mass ratio 2.5:2.5:31.6:31.6:31.7 is configured to lubricant, other steps are the same as embodiment 11.
| Project | Br(KGs) | Hcj(KOe) | BH(max)(MGOe) | Hk/Hcj (%) |
| Comparative example 1 | 13.12 | 13.87 | 45.69 | 96.4 |
| Embodiment 1 | 13.79 | 14.38 | 47.78 | 96.2 |
| Embodiment 2 | 14.05 | 14.41 | 47.84 | 96.5 |
| Embodiment 3 | 13.85 | 14.22 | 47.82 | 98.5 |
| Embodiment 4 | 14.13 | 14.43 | 47.83 | 96.5 |
| Embodiment 5 | 14.20 | 14.42 | 47.88 | 96.5 |
| Embodiment 6 | 13.66 | 14.25 | 47.60 | 96.6 |
| Embodiment 7 | 13.97 | 14.38 | 47.66 | 97.5 |
| Embodiment 8 | 13.89 | 14.34 | 47.62 | 94.5 |
| Embodiment 9 | 13.98 | 14.38 | 47.69 | 97.5 |
| Embodiment 10 | 13.97 | 14.38 | 47.68 | 97.9 |
| Embodiment 11 | 13.75 | 14.25 | 47.65 | 94.5 |
| Embodiment 12 | 13.84 | 14.19 | 47.66 | 94.7 |
| Embodiment 13 | 13.85 | 14.15 | 46.95 | 94.6 |
| Embodiment 14 | 13.89 | 14.30 | 46.69 | 94.6 |
Claims (6)
1. the lubricant that a kind of powder metallurgy prepares neodymium iron boron magnetic body, it is characterised in that: the lubricant include solute with it is molten
Agent, solute be selected from 2- aminobenzothiazole, borate it is one or two kinds of；Solvent is selected from chloroform, ether and petroleum ether
One or more, the mass ratio of solute and solvent is 0.5:99.5~5:95.
2. lubricant according to claim 1, it is characterised in that: when solute is selected from 2- aminobenzothiazole and borate
When, the mass ratio of 2- aminobenzothiazole and borate is 1:1~1:9.
3. lubricant according to claim 1, it is characterised in that: when solvent is selected from chloroform, ether and petroleum ether
At two kinds or three kinds, every kind of solvent quality is identical.
4. the described in any item lubricants of claim 1-3 prepare the purposes in neodymium iron boron magnetic body in powder metallurgy.
5. the described in any item lubricants of claim 1-3 prepare the application method in neodymium iron boron magnetic body, step in powder metallurgy
It is as follows:
(1) lubricant is blown into neodymium iron boron mixed powder tank by inert gas, powder is mixed in 3D batch mixer, until lubricant and neodymium
Iron boron powder is uniformly mixed, and lubricant is evenly coated at particle surface, the lubricant additive amount be Nd-Fe-B powder quality 0.1~
0.5%；
(2) normal orientation forms in Magnetic field press, and in molding pressing process, lubricant uniformly coats NdFeB magnetic powder,
Reduce the frictional force between neodymium iron boron particles in orientation process, improves the degree of orientation；The mobility that powder is improved in forming process, is improved
Green density uniformity；
(3) be sintered in vacuum sintering furnace, between 300~500 DEG C keep the temperature it is gentle to vacuum degree, after continue control sintering furnace continue
Temperature is increased, helps lubricant that magnet is effectively discharged, obtains neodymium iron boron magnetic body.
6. application method according to claim 5, which is characterized in that step (1) is mixed powder 3~5 hours in 3D batch mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910638800.9A CN110181040B (en) | 2019-07-16 | 2019-07-16 | Lubricant for preparing neodymium-iron-boron magnet through powder metallurgy and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910638800.9A CN110181040B (en) | 2019-07-16 | 2019-07-16 | Lubricant for preparing neodymium-iron-boron magnet through powder metallurgy and using method |
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| Publication Number | Publication Date |
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| CN110181040A true CN110181040A (en) | 2019-08-30 |
| CN110181040B CN110181040B (en) | 2021-05-28 |
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| CN201910638800.9A Active CN110181040B (en) | 2019-07-16 | 2019-07-16 | Lubricant for preparing neodymium-iron-boron magnet through powder metallurgy and using method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111375761A (en) * | 2020-04-10 | 2020-07-07 | 中磁科技股份有限公司 | Release agent for protecting neodymium iron boron pressed blank and mould |
| CN111739729A (en) * | 2020-08-08 | 2020-10-02 | 江西开源自动化设备有限公司 | Method for manufacturing sintered neodymium iron boron |
| CN112509776A (en) * | 2020-11-24 | 2021-03-16 | 福建省长汀卓尔科技股份有限公司 | Internal additive for samarium-cobalt alloy powder and preparation method of samarium-cobalt sintered permanent magnet |
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| JPH04191302A (en) * | 1990-11-27 | 1992-07-09 | Shin Etsu Chem Co Ltd | Manufacture of rare earth metal-iron based permanent magnet |
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| EP0302598A1 (en) * | 1987-08-03 | 1989-02-08 | General Motors Corporation | Method of lubrication during hot working of rare earth-transition metal alloys |
| JPH04191302A (en) * | 1990-11-27 | 1992-07-09 | Shin Etsu Chem Co Ltd | Manufacture of rare earth metal-iron based permanent magnet |
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| CN111375761A (en) * | 2020-04-10 | 2020-07-07 | 中磁科技股份有限公司 | Release agent for protecting neodymium iron boron pressed blank and mould |
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| CN112509776A (en) * | 2020-11-24 | 2021-03-16 | 福建省长汀卓尔科技股份有限公司 | Internal additive for samarium-cobalt alloy powder and preparation method of samarium-cobalt sintered permanent magnet |
| CN112509776B (en) * | 2020-11-24 | 2023-08-22 | 福建省长汀卓尔科技股份有限公司 | Internal additive for samarium cobalt alloy powder and preparation method of samarium cobalt sintered permanent magnet |
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| CN110181040B (en) | 2021-05-28 |
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