CN110534329A - A kind of preparation method of iron-nickel alloy magnetic fluid - Google Patents
A kind of preparation method of iron-nickel alloy magnetic fluid Download PDFInfo
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- CN110534329A CN110534329A CN201910790127.0A CN201910790127A CN110534329A CN 110534329 A CN110534329 A CN 110534329A CN 201910790127 A CN201910790127 A CN 201910790127A CN 110534329 A CN110534329 A CN 110534329A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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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
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
- H01F1/442—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids the magnetic component being a metal or alloy, e.g. Fe
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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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- Crystallography & Structural Chemistry (AREA)
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- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The present invention relates to a kind of preparation method of iron-nickel alloy magnetic fluid, method includes: to be heat-treated to iron-nickel alloy, magnetizes iron-nickel alloy；Iron-nickel alloy after heat treatment is polished, iron-nickel alloy polishing fluid is obtained；Iron-nickel alloy polishing fluid is subjected to supersonic oscillations washing；Centrifuge washing is carried out to the iron-nickel alloy polishing fluid after supersonic oscillations washing using ethyl alcohol, obtains iron-nickel alloy nanometer sheet；Iron-nickel alloy nanometer sheet is activated using acetone；Iron-nickel alloy nanometer sheet after activation processing is surface modified processing and is centrifugated；By surface modification, treated that iron-nickel alloy nanometer sheet is scattered in liquid medium, obtains iron-nickel alloy magnetic fluid.The preparation method can prepare iron-nickel alloy magnetic fluid without expensive iron-nickel alloy nano particle, reduce the preparation cost of iron-nickel alloy magnetic fluid, promote the popularization and application of iron-nickel alloy fluid.
Description
Technical field
The invention belongs to magnetic fluid technical field more particularly to a kind of preparation methods of iron-nickel alloy magnetic fluid.
Background technique
Magnetic fluid is the intellectual material of a kind of great development prospect and engineering application value, basis and the application in the field
Research receives the extensive attention of countries in the world in recent years, and gradually develops into a kind of new industry.
Magnetic fluid is also known as magnetic liquid, magnetic fluid, ferrofluid, is living by magnetic nano-particle, carrier fluid and surface
Property agent composition a kind of stable colloidal dispersion.Magnetic nano-particle is nanoscale particle, generally by metals such as iron, cobalt, nickel
Or alloy or its oxide form.
The performance advantage of iron-nickel alloy is magnetic conductivity height, is especially apparent under weak, middle magnetic field.In addition to this, due to adding
Precious metal nickel is entered, so iron-nickel alloy possesses minimum coercivity, processing performance is very good, compared to more other alloys
Say that it possesses superior rustless property.But this alloy, which is also gathered around, has one disadvantage in that, that is, production cost is too high.Due to containing
There are the elements such as nickel, cobalt, such alloy price is generally higher.
Iron-nickel alloy magnetic nano-particle because have high saturation and magnetic intensity, high-curie temperature, high magnetic permeability, low magnetic respectively to
The soft magnetic materials characteristic such as anisotropic constant, therefore have vast potential for future development, it can be applied to high density magnetic recording, sensor, urge
Many Material Fields such as change, magnetic fluid, biomedicine, pigment, electromagnetic shielding and radar wave absorbing.
There are many method for preparing nanometer iron-nickel alloy, are classified as three classes according to the difference of the state of matter of preparation process:
Solid phase method, liquid phase method and vapor phase method.Wherein solid phase method includes mechanical alloying method, mechanochemical reaction, solid-bed break-up method etc..
Liquid phase method includes sol-gal process, hydro-thermal method, liquid phase thermal decomposition method, spray pyrolysis, electrochemical deposition method and liquid phase reduction
Deng.Vapor phase method includes gas chemistry method, vaporization condensation process etc..The general product purity obtained using physical method is low and partial size divides
Cloth is uneven, and sometimes especially high to the equipment requirement of preparation, so that its preparation cost also remains high.
The main component for preparing iron-nickel alloy magnetic fluid is magnetic Nano iron-nickel alloy, but due to iron-nickel alloy nanometer material
Material preparation is difficult, expensive, and the application of iron-nickel alloy fluid is caused to be restricted.
Summary of the invention
The present invention provides a kind of preparation method of iron-nickel alloy magnetic fluid, to solve in the prior art using Nanoscale Iron
Nickel alloy prepares iron-nickel alloy magnetic fluid, and material cost is high, is not easy the technical issues of promoting.
First aspect present invention provides a kind of preparation method of iron-nickel alloy magnetic fluid, and method includes:
Iron-nickel alloy is heat-treated, iron-nickel alloy is magnetized；
Iron-nickel alloy after heat treatment is polished, iron-nickel alloy polishing fluid is obtained；
Iron-nickel alloy polishing fluid is subjected to supersonic oscillations washing；
Centrifuge washing is carried out to the iron-nickel alloy polishing fluid after supersonic oscillations washing using ethyl alcohol, iron-nickel alloy is obtained and receives
Rice piece；
Iron-nickel alloy nanometer sheet is activated using acetone；
Iron-nickel alloy nanometer sheet after activation processing is surface modified and handles and is centrifugally separating to obtain at surface modification
Iron-nickel alloy nanometer sheet after reason；
By the surface modification, treated that iron-nickel alloy nanometer sheet is scattered in liquid medium, obtains iron-nickel alloy magnetism
Fluid.
Preferably, the time of supersonic oscillations washing is 5min~10min.
It preferably, the use of the time that acetone is activated the nanometer sheet that centrifuge washing obtains is 0.5h~2h.
Preferably, the time of surface modification processing is 20h~for 24 hours, and reaction temperature is 25 DEG C~80 DEG C.
Preferably, the rate of centrifuge separation is 2000r/min~5000r/min, centrifugation time 20min.
Preferably, liquid medium is one of DI water, ethylene glycol, fluorine ether oil or a variety of mixtures.
Preferably, iron-nickel alloy nanometer sheet thickness range is 10~50nm, and diameter range is 0.1~3 μm.
Preferably, iron-nickel alloy nanometer sheet and the mass concentration of liquid medium proportion are 5%~30%.
From the embodiments of the present invention it is found that the preparation method of iron-nickel alloy magnetic fluid provided by the embodiments of the present application,
Make its magnetization by carrying out heat treatment to iron-nickel alloy, then polishing is carried out to heat treated iron-nickel alloy and obtains polishing fluid, it is right
Polishing fluid is washed, is centrifuged to obtain iron-nickel alloy nanometer sheet, after being surface modified to obtained iron-nickel alloy nanometer sheet again
It is scattered in liquid medium and obtains iron-nickel alloy magnetic fluid.Relative to traditional preparation methods, this method is without valuableness
Iron-nickel alloy nano particle can prepare iron-nickel alloy magnetic fluid, reduce the preparation cost of iron-nickel alloy magnetic fluid, promote
Into the popularization and application of iron-nickel alloy fluid.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those skilled in the art without any creative labor, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow diagram of the preparation method of iron-nickel alloy magnetic fluid provided by the embodiments of the present application；
Fig. 2 is the scanning electron microscope (SEM) photograph of iron-nickel alloy magnetic fluid provided by the embodiments of the present application.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, and not all embodiments.Based on the embodiments of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Technical solution for a better understanding of the invention, referring to Fig. 1, magnetic for a kind of iron-nickel alloy provided by the present application
The preparation method flow diagram of fluid, method include:
Step 101, iron-nickel alloy is heat-treated, magnetizes iron-nickel alloy；
In the embodiment of the present application, it since the material for preparing iron-nickel alloy magnetic fluid is made from iron-nickel alloy, needs
Iron-nickel alloy has good magnetic property.Therefore it needs to magnetize iron-nickel alloy material, there are many ways to magnetization, this Shen
Heat treatment method please be used to magnetize iron-nickel alloy in embodiment, obtain the excellent iron-nickel alloy material of magnetic property.
Step 102, the iron-nickel alloy after heat treatment is polished, obtains iron-nickel alloy polishing fluid；
In the embodiment of the present application, to the polishing of iron-nickel alloy not to obtain the iron-nickel alloy material of lustrous surface as mesh
, but in order to obtain the polishing fluid comprising iron-nickel alloy nanometer sheet, therefore polishing herein uses physics polishing method to iron
Nickel alloy material is polished.The polishing fluid generated to polishing is collected.
Step 103, iron-nickel alloy polishing fluid is subjected to supersonic oscillations washing；
In the embodiment of the present application, include more impurity in the polishing fluid collected in step 102, washed using supersonic oscillations
It washs to remove partial impurities.
Step 104, centrifuge washing is carried out to the iron-nickel alloy polishing fluid after supersonic oscillations washing using ethyl alcohol, obtains iron
Nickel alloy nanometer sheet；
It in the embodiment of the present application, can be effective using centrifugal method since the quality of different material in polishing fluid is different
Iron-nickel alloy nanometer sheet is separated with other impurities.Ethanol solution can polishing to being adhered in iron-nickel alloy nanometer sheet
The organic impurities such as agent carry out washing cleaning, obtain pure iron nickel alloy solution, and iron-nickel alloy nanometer sheet can be obtained in separation.Using centrifugation
Iron-nickel alloy can also be divided into different thickness and size by method, for the iron-nickel alloy magnetic fluid of different purposes to be made.
Step 105, iron-nickel alloy nanometer sheet is activated using acetone；
In the embodiment of the present application, the iron-nickel alloy nanometer sheet after washing is added into acetone soln, is activated.
Step 106, the iron-nickel alloy nanometer sheet after activation processing is surface modified and handles and is centrifugally separating to obtain table
Iron-nickel alloy nanometer sheet after the moditied processing of face；
In the embodiment of the present application, the iron-nickel alloy nanometer sheet addition after being activated in step 105 using acetone is had
It is surface modified processing in solvent, mixed liquor is centrifuged after having handled to obtain the iron-nickel alloy of organic matter package
Nanometer sheet.
Step 107, the dispersion of surface modification treated iron-nickel alloy nanometer sheet is obtained into iron-nickel alloy with liquid medium
Magnetic fluid.
In the embodiment of the present application, the surface modification iron-nickel alloy nanometer sheet that treated has organic matter to wrap up uniformly is divided
It dissipates in liquid medium, iron-nickel alloy magnetic fluid can be obtained.As shown in Fig. 2, being closed for iron nickel provided by the embodiments of the present application
The scanning electron microscope (SEM) photograph of golden magnetic fluid.
The preparation method of iron-nickel alloy magnetic fluid provided by the embodiments of the present application, by being heat-treated to iron-nickel alloy
Make its magnetization, then polishing is carried out to heat treated iron-nickel alloy and obtains polishing fluid, polishing fluid is washed, is centrifuged to obtain iron
Nickel alloy nanometer sheet is redispersed in liquid medium after being surface modified to obtained iron-nickel alloy nanometer sheet and obtains the conjunction of iron nickel
Golden magnetic fluid.Relative to traditional preparation methods, this method can prepare iron without expensive iron-nickel alloy nano particle
Nickel alloy magnetic fluid reduces the preparation cost of iron-nickel alloy magnetic fluid, promotes the popularization and application of iron-nickel alloy fluid.
Embodiment as one preferred, the time of supersonic oscillations washing are 5min~10min.
Embodiment as one preferred, using acetone to the nanometer sheet that centrifuge washing obtains be activated when
Between be 0.5h~2h.
Embodiment as one preferred, the time of surface modification processing are 20h~for 24 hours, reaction temperature is 25 DEG C~
80℃。
Embodiment as one preferred, the rate of centrifuge separation are 2000r/min~5000r/min, centrifugation time
For 20min.
Embodiment as one preferred, liquid medium are one of DI water, ethylene glycol, fluorine ether oil or a variety of mixing
Object.
Embodiment as one preferred, iron-nickel alloy nanometer sheet thickness range are 10~50nm, diameter range 0.1
~3 μm.
The mass concentration proportion of embodiment as one preferred, iron-nickel alloy nanometer sheet and liquid medium for 5%~
30%.
It is for reference to be exemplified below several embodiments:
Embodiment 1:
(1) certain iron-nickel alloy 1J50 is taken to be heat-treated, heat treatment carries out in hydrogen heat-treatment furnace, and heat treatment is basic
Process are as follows: acetone cleaning → drying → shove charge → logical cooling water → logical N2 prepurging → logical H2 → energization heating → heat preservation → cooling →
It comes out of the stove.1130 DEG C of heat preservation 4h continue logical H2 to 600 DEG C, are cooled fast to 200 DEG C.
(2) iron-nickel alloy being centainly heat-treated is taken, is polished.
(3) it takes certain polishing fluid to be put into 500mL beaker, pours into the dehydrated alcohol of 200mL, carry out ultrasonic oscillation washing
Then 10min is centrifuged, iron-nickel alloy waste liquid is washed three times repeatedly by above-mentioned steps, obtains pure iron nickel alloy solution.
(4) iron-nickel alloy sheet after washing is added in 100mL acetone soln, is taken out after activating 1h.
(5) the iron-nickel alloy sheet liquid after after activation is added in 100mL oleic acid (octadecenic acid), stirs evenly, puts
It is placed for 24 hours under the conditions of 25 DEG C.
(6) iron-nickel alloy sheet liquid and oleic acid mixed liquor are centrifuged 20min with the revolving speed of 3000r/min, obtain oleic acid package
Iron-nickel alloy sheet.
(7) iron-nickel alloy sheet that oleic acid wraps up is dispersed in DI water, obtains a kind of magnetic Nano fluid.This magnetic
Property fluid can be stabilized 3 months or more, magnetic conductivity is high, under weak, middle magnetic field, can make particle in liquid rapidly and
It reversibly acts, and the mobility of fluid, viscosity can be made etc. rapidly and reversibly change.
Embodiment 2:
With embodiment 1, step (6) is as follows to step (7) for step (1), (2), (3), (4), (5):
(6) iron-nickel alloy sheet liquid and oleic acid mixed liquor are centrifuged 20min with the revolving speed of 4000r/min, obtain oleic acid package
Iron-nickel alloy sheet.
(7) iron-nickel alloy sheet that oleic acid wraps up is dispersed in the mixed liquor of ethylene glycol and water, obtains a kind of magnetic
Property nano-fluid.This magnetic fluid can be stabilized 3 months or more, and magnetic conductivity is high, under weak, middle magnetic field, can make liquid
In particle act rapidly and reversibly, and the mobility of fluid, viscosity can be made etc. rapidly and reversibly change.
Embodiment 3:
With embodiment 1, step (6) is as follows to step (7) for step (1), (2), (3), (4), (5):
(6) iron-nickel alloy sheet liquid and oleic acid mixed liquor are centrifuged 20min with the revolving speed of 5000r/min, obtain oleic acid package
Iron-nickel alloy sheet.
(7) iron-nickel alloy sheet that oleic acid wraps up is dispersed in fluorine ether oil, obtains a kind of magnetic Nano fluid.This
Magnetic fluid can be stabilized 1 year or more, and magnetic conductivity is high, under weak, middle magnetic field, can make particle in liquid rapidly and
It reversibly acts, high surface, high heat resistance stability and high chemical stability, fluorine-containing alkyl is neither dissolved in water, also insoluble
In oil, so this magnetic fluid better effect in terms of sealing, lubrication applications.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments.
The above are the descriptions to technical solution provided by the present invention, for those skilled in the art, according to the present invention
The thought of embodiment, there will be changes in the specific implementation manner and application range, and to sum up, the content of the present specification should not manage
Solution is limitation of the present invention.
Claims (8)
1. a kind of preparation method of iron-nickel alloy magnetic fluid, which is characterized in that the described method includes:
Iron-nickel alloy is heat-treated, iron-nickel alloy is magnetized；
Iron-nickel alloy after heat treatment is polished, iron-nickel alloy polishing fluid is obtained；
The iron-nickel alloy polishing fluid is subjected to supersonic oscillations washing；
Centrifuge washing is carried out to the iron-nickel alloy polishing fluid after supersonic oscillations washing using ethyl alcohol, obtains iron-nickel alloy nanometer
Piece；
The iron-nickel alloy nanometer sheet is activated using acetone；
Iron-nickel alloy nanometer sheet after activation processing is surface modified after handling and being centrifugally separating to obtain surface modification processing
Iron-nickel alloy nanometer sheet；
By the surface modification, treated that iron-nickel alloy nanometer sheet is scattered in liquid medium, obtains iron-nickel alloy magnetic flow
Body.
2. the preparation method of magnetic fluid according to claim 1, which is characterized in that supersonic oscillations washing when
Between be 5min~10min.
3. the preparation method of magnetic fluid according to claim 1, which is characterized in that described to use acetone to centrifuge washing
The time that obtained nanometer sheet is activated is 0.5h~2h.
4. the preparation method of magnetic fluid according to claim 1, which is characterized in that the time of the surface modification processing
For 20h~for 24 hours, reaction temperature is 25 DEG C~80 DEG C.
5. the preparation method of magnetic fluid according to claim 1, which is characterized in that the rate of the centrifuge separation is
2000r/min~5000r/min, centrifugation time 20min.
6. the preparation method of magnetic fluid according to claim 1, which is characterized in that the liquid medium is DI water, second
One of glycol, fluorine ether oil or a variety of mixtures.
7. the preparation method of magnetic fluid according to claim 1, which is characterized in that the iron-nickel alloy nanometer sheet thickness
Range is 10~50nm, and diameter range is 0.1~3 μm.
8. the preparation method of magnetic fluid according to claim 1, which is characterized in that the iron-nickel alloy nanometer sheet and institute
The mass concentration proportion for stating liquid medium is 5%~30%.
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|---|---|---|---|---|
| GB458315A (en) * | 1935-07-08 | 1936-12-17 | Ig Farbenindustrie Ag | Improvements in the manufacture and production of magnetisable iron-nickel alloys |
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| US5462685A (en) * | 1993-12-14 | 1995-10-31 | Ferrofluidics Corporation | Ferrofluid-cooled electromagnetic device and improved cooling method |
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| CN103333731A (en) * | 2013-06-08 | 2013-10-02 | 东南大学 | Method for preparing magnetorheological fluid |
| CN103606429A (en) * | 2013-10-17 | 2014-02-26 | 南昌大学 | Nano chromium carbide ferrofluid and preparation method thereof |
| CN106486240A (en) * | 2015-08-28 | 2017-03-08 | 湖南博海新材料股份有限公司 | The Preparation equipment of nanometer magneto-rheological fluid and method |
| EP3480340A1 (en) * | 2017-11-03 | 2019-05-08 | The Boeing Company | Iron particle passivation |
-
2019
- 2019-08-26 CN CN201910790127.0A patent/CN110534329B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB458315A (en) * | 1935-07-08 | 1936-12-17 | Ig Farbenindustrie Ag | Improvements in the manufacture and production of magnetisable iron-nickel alloys |
| JPH06139547A (en) * | 1992-10-28 | 1994-05-20 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| US5462685A (en) * | 1993-12-14 | 1995-10-31 | Ferrofluidics Corporation | Ferrofluid-cooled electromagnetic device and improved cooling method |
| CN1725388A (en) * | 2005-06-17 | 2006-01-25 | 同济大学 | A kind of magnetic flow liquid magnetic-particle and preparation method thereof with high antioxidant |
| CN102290186A (en) * | 2011-05-04 | 2011-12-21 | 北京科技大学 | High-concentration magnetic fluid and preparation method thereof |
| CN103333731A (en) * | 2013-06-08 | 2013-10-02 | 东南大学 | Method for preparing magnetorheological fluid |
| CN103606429A (en) * | 2013-10-17 | 2014-02-26 | 南昌大学 | Nano chromium carbide ferrofluid and preparation method thereof |
| CN106486240A (en) * | 2015-08-28 | 2017-03-08 | 湖南博海新材料股份有限公司 | The Preparation equipment of nanometer magneto-rheological fluid and method |
| EP3480340A1 (en) * | 2017-11-03 | 2019-05-08 | The Boeing Company | Iron particle passivation |
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