EP0845790A1 - Magnetorheologische Flüssigkeiten, und mit Polymer beschichteten magnetisierbaren Teilchen - Google Patents
Magnetorheologische Flüssigkeiten, und mit Polymer beschichteten magnetisierbaren Teilchen Download PDFInfo
- Publication number
- EP0845790A1 EP0845790A1 EP97120063A EP97120063A EP0845790A1 EP 0845790 A1 EP0845790 A1 EP 0845790A1 EP 97120063 A EP97120063 A EP 97120063A EP 97120063 A EP97120063 A EP 97120063A EP 0845790 A1 EP0845790 A1 EP 0845790A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetizable particles
- organic polymer
- coated
- magnetorheological fluids
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H01F1/06—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 in the form of particles, e.g. powder
- H01F1/061—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 in the form of particles, e.g. powder with a protective layer
-
- 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
- H01F1/447—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids characterised by magnetoviscosity, e.g. magnetorheological, magnetothixotropic, magnetodilatant liquids
Definitions
- the invention relates to new magnetorheological fluids, a method for their manufacture and their use as well as processes for the manufacture of with an organic polymer coated magnetizable particles.
- Magnetorheological fluids consist of a carrier liquid and magnetizable particles dispersed therein. These dispersions change their flow behavior when a magnetic is applied Field. Possible areas of application of magnetorheological fluids are, for example Couplings, dampers and bearings.
- magnetisable Particles paramagnetic, superparamagnetic and ferromagnetic Fabrics used for use in magnetorheological fluids.
- the object of the invention is therefore to provide MRFs which are in the prior art Technology known disadvantages do not have problems.
- magnetorheological fluids containing a organic polymer coated magnetizable particles contain an improved Colloid stability, improved settling stability and reduced abrasiveness exhibit.
- the invention therefore relates to magnetorheological liquids of magnetizable particles, at least one oleophilic liquid and optionally a thickener, characterized in that the magnetizable Particles are coated with an organic polymer.
- Preferred magnetorheological liquids are 45 to 95% by weight, particularly preferably 60 to 95% by weight, very particularly preferably 75 to 95% by weight, the magnetizable particles coated with an organic polymer, and 2 up to 45% by weight of an oleophilic liquid and 0 to 20% by weight of thickener included, the sum of the wt .-% is 100 wt .-%.
- Magnetizable particles in the sense of the invention are paramagnetic, superparamagnetic and ferromagnetic substances.
- Examples include: iron, iron nitride, iron carbide, steel with less than 1% carbon, nickel and cobalt. Mixtures of the substances mentioned and iron alloys with aluminum, silicon, cobalt, nickel, vanadium, molybdenum, chromium, tungsten and manganese are also suitable.
- Iron-nickel alloys and iron-cobalt alloys can be mentioned as well-suited alloys.
- Magnetic oxides of chromium and iron, such as chromium dioxide, gamma-Fe 2 O 3 and Fe 3 O 4 are also suitable.
- Iron and / or iron alloys are preferred magnetizable particles.
- the mean longest dimension of the invention is preferably, with an organic polymer coated magnetizable particles, based on their mass (mass average), 0.1 to 100 microns, particularly preferably 1 to 50 microns.
- the shape of the magnetizable particles can also be irregular, rod-shaped or be needle-shaped.
- the spherical shape or a shape similar to the spherical shape is especially preferred when high fill levels are desired.
- Organic polymers in the sense of the invention are natural polymers, such as e.g. Gelatin or cellulose, modified natural polymers, in particular cellulose derivatives, and synthetic polymers, with synthetic polymers being preferred.
- gelatin includes gelatin coacervates and gelatin-like complex coacervates. Combinations of are particularly suitable as gelatin-containing complex coacervates Gelatin with synthetic polyelectrolytes preferred. Suitable synthetic polyelectrolytes are those which are obtained by homo- or copolymerization of e.g. Maleic acid, Acrylic acid, methacrylic acid, acrylamide and methacrylamide emerge. Of the
- gelatin also includes those with conventional hardening agents such as e.g. formaldehyde or glutardialdehyde further cross-linked gelatin.
- Suitable synthetic polymers are: polyester, polyurethane, in particular polyester urethanes and polyether urethanes, polycarbonates, polyester-polycarbonate copolymers, Polyureas, melamine resins, polysiloxanes, fluoropolymers and vinyl polymers.
- suitable vinyl polymers are called: polyvinyl chloride, polyvinyl esters, e.g. Polyvinyl acetate, polystyrene, Polyacrylic esters, such as polymethyl methacrylate, polyethylhexyl acrylate, polylauryl methacrylate, Polystearyl methacrylate or polyethylacrylate, polyvinyl acetals, such as polyvinyl butyral.
- Other synthetic polymers are also copolymers or terpolymers from various Vinyl and vinylidene monomers such as e.g. Polystyrene-co-acrylonitrile and copolymers from (meth) acrylic acid and (meth) acrylic esters.
- Particularly preferred organic Polymers are vinyl polymers, polyureas and / or polyurethanes.
- the molecular weight of the polymer can be chosen arbitrarily for this application will. Usual suitable polymers have a weight average of 30,000 - 1,000,000 daltons. The polymers can also be cross-linked.
- the magnetorheological liquids according to the invention contain as oleophilic Liquid (carrier liquid) preferably mineral oils, paraffin oils, hydraulic oils, oils containing chlorinated aromatics (so-called transformer oils), and chlorinated and fluorinated oils. Likewise preferred are silicone oils, fluorinated silicone oils, polyethers, fluorinated polyethers and polyether polysiloxane copolymers.
- the viscosity of the carrier liquid is preferably 1 to 1000 mPas, particularly preferably 3 to 800 mPas, measured at 25 ° C.
- the magnetorheological liquids as carrier liquid at least one mineral oil or at least one silicone oil.
- the invention magnetorheological liquids additionally at least one thickener, which gives the magnetorheological fluid a thixotropy and increases the settling stability of the magnetizable particles.
- thickeners e.g. finely divided inorganic or organic microparticles.
- silicates such as bentonite or metal oxides such as titanium dioxide, aluminum oxide or Silicon dioxide and / or flame-hydrolytically obtained highly disperse silicas, which e.g. under the trade names Aerosil® or HDK® from Degussa AG, Germany, or Wacker Chemie GmbH, Germany, commercially available are, with all microparticles an average particle diameter of less than 1 micron exhibit.
- the amount of thickeners is 0.1 to 20 wt .-%, preferably 0.5 to 5 wt .-%.
- the magnetorheological liquids according to the invention can also contain dispersing agents contain.
- dispersants are lecithin, oleic acid and oleates such as iron oleate, fatty acids, alkali soaps such as lithium stearate, sodium stearate, Aluminum tristearate, sulfonates and phosphonates with lipophilic residues as well Glycerol esters such as glycerol monostearate.
- the dispersants are preferably in amounts of 0.01 to 2% by weight, particularly preferably 0.1 to 0.5% by weight, based on the magnetizable particles.
- the weight fraction of the coating of those coated with organic polymer magnetizable particles is 0.1 to 50% by weight, preferably 0.5 to 20 % By weight.
- the invention also relates to a method for producing the organic polymers coated magnetizable particles, after which the organic Polymer in molten form or from a solvent by precipitation or vaporization is applied to the magnetizable particles.
- the invention also relates to a further method for producing the organic polymers coated magnetizable particles, after which in the presence the magnetizable particles are organic monomer components by means of polycondensation, Polyaddition or polymerization implemented to an organic polymer will.
- the organic monomer components are, for example, the Combination of aliphatic diols and aromatic or aliphatic dicarboxylic acids, Dicarboxylic acid chlorides, for the polyaddition, for example, the combination of diols, polyester and / or Polyether diols with di- or triisocyanates and for the polymerization, for example, olefinically unsaturated compounds, such as Styrene, acrylic acid ester, methacrylic acid ester and / or vinyl acetate are preferred.
- Silanization means surface treatment with silanes, preferably those silanes are used which have at least one functional group, e.g. OH, Cl.
- radicals R 1 are methyl, ethyl, propyl, n-butyl, tert-butyl, hexyl, octyl, ethylhexyl, decyl, dodecyl, stearyl, vinyl or allyl.
- substituted R 1 radicals are: R 2 is preferably a phenyl or a C 1 -C 6 alkyl radical, such as methyl, ethyl, propyl, n-butyl, tert-butyl, pentyl or hexyl.
- the hydrolyzable groups on the Si atom symbolized by X comprise, for example, halogen atoms, in particular chlorine and bromine, C 1 -C 6 alkoxy groups, preferably methoxy and ethoxy, and carboxylate groups, such as acetate and propionate.
- silane must be matched to the following polymer coating be.
- silanes 3 or 4 a silane is also used polymerizable double bonds applied to the magnetizable particles.
- a polymer coating by radical Polymerization of monomers e.g. Acrylic acid esters, creating a solid chemical bond is established between the silane and the polymer coating, prefers.
- isocyanate-containing compounds e.g. with stearyl isocyanate for reaction brought, whereby a polymer coating with urea units is formed. Silanization with silanes 3, 4, 7 and / or 9 is therefore preferred.
- the implementation can be done by simply mixing the components with usual stirring or mixing devices.
- the temperature during the implementation is preferably in the range from 0 ° C to 100 ° C and the reaction time is preferably 0.1 h to 10 h.
- the amount of silane used can be varied within wide limits; it lies preferably in the range from 0.01 to 25% by weight, particularly preferably 0.1 to 10 % By weight, based on the magnetizable particles.
- the silanization is preferably carried out in the presence of at least one aprotic Solvent carried out.
- Suitable solvents are e.g. Acetone, butanone, Dichloromethane, trichloromethane, toluene, ethyl acetate or tetrahydrofuran.
- a catalyst can also be used in the silanization.
- Suitable Catalysts are protonic acids such as acetic acid or hydrogen chloride as well Amines such as dicyclohexylamine.
- the amount of the catalyst is preferably 0.01 up to 5 wt .-%, based on the silane.
- the silane used in the silanization can initially with acid catalysis e.g. molar amounts of water are hydrolyzed, the hydrolyzable residues X are converted into OH groups, and then the freshly prepared OH compound reacted with the magnetizable particle in a solvent becomes.
- the invention also relates to a method for producing the invention magnetorheological fluids, after which in an oleophilic fluid, optionally in the presence of a thickener, which is also according to the invention Process produced, coated with an organic polymer magnetizable particles are dispersed.
- the carrier liquid is first with the thickener using high shear forces, i.e. preferably at dispersing energies between 50 and 500 W / l, for example with the help of an Ultraturrax®, available from IKA-Labortechnik, Germany, homogeneous mixed and then stirred in the coated magnetizable particles.
- high shear forces i.e. preferably at dispersing energies between 50 and 500 W / l, for example with the help of an Ultraturrax®, available from IKA-Labortechnik, Germany, homogeneous mixed and then stirred in the coated magnetizable particles.
- the invention also relates to the use of the nonaqueous compositions according to the invention magnetorheological fluids in couplings, dampers and / or To store.
- silanized carbonyl iron was slurried in 2000ml butanone and with 190g Stearyl methacrylate, 10 g ethylene glycol dimethacrylate and 6 g azoisobutyronitrile transferred. The mixture was stirred and refluxed at 70 ° C for 2 h and 2 h heated. The solid is filtered off after cooling, three times with 1500 ml each Washed butanone and dried in vacuo at 50 ° C for 12 h.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
- Lubricants (AREA)
Abstract
Description
- R1
- ein C1 - C20-Alkylrest oder C2 - C20-Alkylenrest, der gegebenenfalls mit einer Amino-, Isocyanato- Methacryloyoxy- Acryloyloxy-, Epoxy- oder Mercaptogruppe substituiert sein und / oder durch -O-, -NH-, -COO- oder -NH-COO unterbrochen sein kann
- R2
- ein Phenyl, ein C1 - C18-Alkylrest oder ein C2 - C18-Alkylenrest
- X
- eine hydrolisierbare Gruppe bedeuten und
- a
- den Wert 0, 1 oder 2 annimmt, silanisiert.
Claims (14)
- Magnetorheologische Flüssigkeiten, bestehend aus magnetisierbaren Teilchen, mindestens einer oleophilen Flüssigkeit und gegebenenfalls einem Verdickungsmittel, dadurch gekennzeichnet, daß die magnetisierbaren Teilchen mit einem organischen Polymer beschichtet sind.
- Magnetorheologische Flüssigkeiten nach Anspruch 1, dadurch gekennzeichnet, daß diese 45 bis 98 Gew.-% mit einem organischen Polymer beschichtete magnetisierbare Teilchen, 2 bis 45 Gew.-% einer oleophilen Flüssigkeit sowie 0 bis 20 Gew.-% eines Verdickungsmittels enthalten, wobei die Summe der Gew.-% 100 Gew.-% ergibt.
- Magnetorheologische Flüssigkeiten nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die mittlere längste Ausdehnung der mit einem organischen Polymer beschichteten magnetisierbaren Teilchen, bezogen auf deren Masse, 0,1 bis 100 µm beträgt.
- Magnetorheologische Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Gewichtsanteil der Beschichtung der mit organischem Polymer beschichteten magnetisierbaren Teilchen 0,1 bis 50 Gew.-%, bezogen auf die magnetisierbaren Teilchen, beträgt.
- Magnetorheologische Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das organische Polymer Vinylpolymerisate, Polyharnstoffe und/oder Polyurethane sind.
- Magnetorheologische Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die magnetisierbaren Teilchen aus Eisen und/oder Eisenlegierungen sind.
- Magnetorheologische Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Verdickungsmittel Gele, Silikate, Metalloxide und/oder flammhydrolytisch gewonnene hochdisperse Kieselsäuren mit einem mittleren Teilchendurchmessen von kleiner 1 µm sind.
- Magnetorheologische Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Menge an Verdickungsmittel 0,1 bis 20 Gew.-% beträgt.
- Magnetorheologische Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die oleophile Flüssigkeit mindestens ein Mineralöl oder mindestens ein Siliconöl ist.
- Verfahren zur Herstellung von mit organischem Polymer beschichteten magnetisierbaren Teilchen, dadurch gekennzeichnet, daß in Gegenwart der magnetisierbaren Teilchen organische Monomerbestandteile mittels Polykondensation, Polyaddition oder Polymerisation zu einem organischen Polymer umgesetzt werden.
- Verfahren zur Herstellung von mit einem organischen Polymer beschichteten magnetisierbaren Teilchen, dadurch gekennzeichnet, daß das organische Polymer in geschmolzener Form oder aus einem Lösemittel ausgefällt oder durch Verdampfen des Lösemittels auf die magnetisierbaren Teilchen aufgebracht wird.
- Verfahren zur Herstellung von mit einem organischen Polymer beschichteten magnetisierbaren Teilchen nach einem oder mehreren der Ansprüche 10 oder 11, dadurch gekennzeichnet, daß die magnetisierbaren Teilchen vorab durch die Umsetzung mit einem Silan der Formel(I) in der
- R1
- ein C1 - C20-Alkylrest oder C2 - C20-Alkylenrest ist, der gegebenenfalls mit einer Amino-, Isocyanato- Methacryloyoxy- Acryloyloxy, Epoxy oder Mercaptogruppe substituiert und/ oder durch -O-, -NH-, -COO- oder NH-COO unterbrochen ist,
- R2
- ein Phenyl oder ein C1 - C6-Alkylrest und
- X
- eine hydrolisierbare Gruppe bedeuten und
- a
- den Wert 0, 1 oder 2 annimmt, silanisiert werden.
- Verfahren zur Herstellung von magnetorheologische Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß in der oleophilen Flüssigkeit, gegebenfalls in Anwesenheit eines Verdickungsmittels, die nach den Ansprüchen 10 bis 12 hergestellten magnetisierbaren Teilchen dispergiert werden.
- Verwendung der magnetorheologischen Flüssigkeiten nach einem oder mehreren der Ansprüche 1 bis 9 in Kupplungen, Dämpfern und / oder Lagern.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19649321 | 1996-11-28 | ||
DE19649321 | 1996-11-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0845790A1 true EP0845790A1 (de) | 1998-06-03 |
EP0845790B1 EP0845790B1 (de) | 2002-07-10 |
Family
ID=7813025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97120063A Expired - Lifetime EP0845790B1 (de) | 1996-11-28 | 1997-11-17 | Magnetorheologische Flüssigkeiten und mit Polymer beschichtete, magnetische Teilchen |
Country Status (5)
Country | Link |
---|---|
US (1) | US5989447A (de) |
EP (1) | EP0845790B1 (de) |
JP (1) | JPH10163021A (de) |
KR (1) | KR19980042844A (de) |
DE (1) | DE59707683D1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2001027945A1 (en) * | 1999-10-15 | 2001-04-19 | Ferrotec Corporation | Composition and method of making a ferrofluid with chemical stability |
WO2001031662A1 (en) * | 1999-10-28 | 2001-05-03 | Ferrotec Corporation | Ferrofluid composition and process |
DE10333703B4 (de) * | 2002-07-24 | 2007-04-26 | Völkl Tennis GmbH | Ballspielschläger |
US7959822B2 (en) | 2005-06-30 | 2011-06-14 | Basf Se | Magnetorheological liquid |
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US6527972B1 (en) * | 2000-02-18 | 2003-03-04 | The Board Of Regents Of The University And Community College System Of Nevada | Magnetorheological polymer gels |
US6451219B1 (en) * | 2000-11-28 | 2002-09-17 | Delphi Technologies, Inc. | Use of high surface area untreated fumed silica in MR fluid formulation |
US6679999B2 (en) | 2001-03-13 | 2004-01-20 | Delphi Technologies, Inc. | MR fluids containing magnetic stainless steel |
JP2003020494A (ja) * | 2001-07-10 | 2003-01-24 | Building Research Institute | 分散安定化磁気粘性流体 |
US6638443B2 (en) | 2001-09-21 | 2003-10-28 | Delphi Technologies, Inc. | Optimized synthetic base liquid for magnetorheological fluid formulations |
US6787058B2 (en) | 2001-11-13 | 2004-09-07 | Delphi Technologies, Inc. | Low-cost MR fluids with powdered iron |
US6824700B2 (en) * | 2003-01-15 | 2004-11-30 | Delphi Technologies, Inc. | Glycol-based MR fluids with thickening agent |
US7101487B2 (en) * | 2003-05-02 | 2006-09-05 | Ossur Engineering, Inc. | Magnetorheological fluid compositions and prosthetic knees utilizing same |
US7883636B2 (en) | 2003-08-08 | 2011-02-08 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Reno | Nanostructured magnetorheological fluids and gels |
US7297290B2 (en) * | 2003-08-08 | 2007-11-20 | The Board Of Regents Of The University And Community College System Of Nevada | Nanostructured magnetorheological fluids and gels |
US6929757B2 (en) * | 2003-08-25 | 2005-08-16 | General Motors Corporation | Oxidation-resistant magnetorheological fluid |
US7070708B2 (en) | 2004-04-30 | 2006-07-04 | Delphi Technologies, Inc. | Magnetorheological fluid resistant to settling in natural rubber devices |
US20050242322A1 (en) * | 2004-05-03 | 2005-11-03 | Ottaviani Robert A | Clay-based magnetorheological fluid |
CN1317721C (zh) * | 2004-06-22 | 2007-05-23 | 上海大学 | 一种磁流变液及其制备方法 |
US7419616B2 (en) * | 2004-08-13 | 2008-09-02 | Gm Global Technology Operations, Inc. | Magnetorheological fluid compositions |
EP1632962A1 (de) * | 2004-09-07 | 2006-03-08 | C.R.F. Società Consortile per Azioni | Ferromagnetische Teilchen für magnetorheologische oder elektrorheologische Flüssigkeiten, diese Teilchen enthaltende magnetorheologische oder elektrorheologische Flüssigkeiten und zugehörige Herstellungsverfahren |
US20060188905A1 (en) | 2005-01-17 | 2006-08-24 | Dynal Biotech Asa | Process |
GB0500888D0 (en) * | 2005-01-17 | 2005-02-23 | Dynal Biotech Asa | Process |
CN100385577C (zh) * | 2005-02-25 | 2008-04-30 | 同济大学 | 以碳纳米管作为抗沉降剂的磁流变液及其制备方法 |
KR20080103773A (ko) * | 2007-05-25 | 2008-11-28 | 에스케이에너지 주식회사 | 자성 복합체 입자 및 이를 이용한 자기유변유체 |
CN101772811B (zh) * | 2007-08-01 | 2013-03-13 | 洛德公司 | 不沉降的基于二醇的磁流变流体 |
US20110121223A1 (en) * | 2009-11-23 | 2011-05-26 | Gm Global Technology Operations, Inc. | Magnetorheological fluids and methods of making and using the same |
DE102010026782A1 (de) | 2010-07-09 | 2012-01-12 | Eckart Gmbh | Plättchenförmige Eisenpigmente, magnetorheologisches Fluid und Vorrichtung |
KR101510040B1 (ko) * | 2014-02-11 | 2015-04-07 | 현대자동차주식회사 | 자기유변유체 조성물 |
KR101768711B1 (ko) * | 2014-07-21 | 2017-08-17 | 서울대학교산학협력단 | 안정성이 우수한 발포고분자로 둘러싸인 자성입자를 함유하는 자기유변체 및 그 제조방법 |
WO2017047681A1 (ja) * | 2015-09-15 | 2017-03-23 | 本田技研工業株式会社 | 磁気粘性流体組成物及びこれを用いた振動減衰装置 |
US10774218B2 (en) * | 2017-11-03 | 2020-09-15 | The Boeing Company | Iron particle passivation |
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1997
- 1997-11-17 DE DE59707683T patent/DE59707683D1/de not_active Expired - Lifetime
- 1997-11-17 EP EP97120063A patent/EP0845790B1/de not_active Expired - Lifetime
- 1997-11-24 US US08/976,555 patent/US5989447A/en not_active Expired - Lifetime
- 1997-11-25 JP JP9338245A patent/JPH10163021A/ja active Pending
- 1997-11-27 KR KR1019970063473A patent/KR19980042844A/ko not_active Application Discontinuation
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001027945A1 (en) * | 1999-10-15 | 2001-04-19 | Ferrotec Corporation | Composition and method of making a ferrofluid with chemical stability |
WO2001031662A1 (en) * | 1999-10-28 | 2001-05-03 | Ferrotec Corporation | Ferrofluid composition and process |
DE10333703B4 (de) * | 2002-07-24 | 2007-04-26 | Völkl Tennis GmbH | Ballspielschläger |
US7959822B2 (en) | 2005-06-30 | 2011-06-14 | Basf Se | Magnetorheological liquid |
Also Published As
Publication number | Publication date |
---|---|
JPH10163021A (ja) | 1998-06-19 |
EP0845790B1 (de) | 2002-07-10 |
US5989447A (en) | 1999-11-23 |
DE59707683D1 (de) | 2002-08-14 |
KR19980042844A (ko) | 1998-08-17 |
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