CN1776835A - Magnetic rheological fluid containing superfine amorphous muterial - Google Patents
Magnetic rheological fluid containing superfine amorphous muterial Download PDFInfo
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- CN1776835A CN1776835A CN 200510134250 CN200510134250A CN1776835A CN 1776835 A CN1776835 A CN 1776835A CN 200510134250 CN200510134250 CN 200510134250 CN 200510134250 A CN200510134250 A CN 200510134250A CN 1776835 A CN1776835 A CN 1776835A
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Abstract
Chemical composition (in volume %) of magnetic rheology liquid of containing superfine amorphous material is as following: magnetic particle 10-50% is as reduced carbonyl iron in crystalline state and iron based amorphous soft magnetic alloys; carrier liquid 45-89% is poly alpha olefin with viscosity as 1-300mPa.s under room temperature; surfactant 1-5% is as titanate coupler and composite aluminium-titanium coupler. In the said magnetic particle, the reduced carbonyl iron in crystalline state (90-95% of the magnetic particle)is spheroidal particle with size range 1-30 micro; and iron based amorphous soft magnetic alloys (5-10% of the magnetic particle)is acicular particles. Comparing prior art, the invention possesses advantages of lower viscosity coefficient in zero field, high yield stress, fine antiflooding stability and excellent magnetic performance.
Description
Technical field
The invention belongs to the intellectual material field, be specifically related to a kind of magnetic flow liquid that contains superfine amorphous muterial.
Background technology
In the prior art, magnetic flow liquid is the suspension that micron-sized magnetic-particle forms in carrier fluid.Adding under the action of a magnetic field, magnetic flow liquid can liquid and solid-state between carry out reversible variation, be a kind of novel intellectual material.
Magnetic flow liquid and magnetic fluid all are to be dispersed in the suitable liquid and the suspension-turbid liquid that forms with magnetic particle, there are many articles not distinguished, but in fact both are distinguishing, and the size range of their suspended particles is different, so performance is all inequality with application.
Magnetic fluid claims magnetic liquid again, is by nanoscale (the stable colloid system that 1～10nm) magnetic particle is constituted in carrier fluid by the surfactant high degree of dispersion.Because suspended particles are little, after adopting suitable surfactant, cloth youth motion can stop the reunion of suspended particles.Magnetic liquid has flowability and ferromagnetism simultaneously, nano level magnetic particle can not form ordered structure in the presence of magnetic field, the direction that only can trend towards magnetic field flows, magnetic fluid has crucial application as a kind of functional material aspect a lot, as magnetic seal, magnetic flotation, detector, loud speaker etc.
Magnetic flow liquid is by the soft magnetic granules of size in 0.1～100 mu m range, a kind of suspension system that forms in suitable carrier fluid with certain amount of surfactant and anti-settling agent.Magnetic flow liquid is under the effect in magnetic field, magnetic force is lined up chain or column structure makes magnetic flow liquid change the solid with certain shear stress and yield strength into by liquid in the time of Millisecond because the magnetization of soft magnetic granules produces, when magnetic field disappears, soft magnetic granules loses magnetism, and magnetic flow liquid becomes liquid by solid again.This key property of magnetic flow liquid makes it become an important branch of current intellectual material research category, has application fields.As the transmission clutch and the controllable damper of automobile, the various liquid of no spool are pressed valve, voltage sensor, robot movable joint, mechanical jig, optical polish, sealing, magnetic flow liquid comprehensive training device etc.
Since the fifties, the research of magnetic flow liquid and preparation have been obtained certain progress, and some commercial magnetic flow liquid device has obtained application in some occasions.But because the proportion of magnetic-particle and carrier fluid differs greatly, the sedimentation stability of most of magnetic flow liquids is relatively poor, and the sedimentation knot plate of magnetic-particle takes place easily, influenced the redispersibility energy of magnetic flow liquid, the application scenario and the field of greatly having limited magnetic flow liquid.
For sedimentation and the agglomeration traits that solves magnetic-particle, the various surfactants of general adding, but in fact, adding too much surfactant not only can increase the null field viscosity of magnetic flow liquid greatly, and if added inappropriate surfactant also be easy to form be difficult to disperse again inflexible after the magnetic-particle sedimentation.Another kind method is to add nonmagnetic light material in the magnetropism material to make the sedimentation stability that the lighter compound particle of proportion improves magnetic flow liquid, for example: in 2005 disclosed Chinese patent CN 1595558A on March 16, " a kind of magnetic flow liquid and preparation method thereof ", adopted the surface to be coated with the magnetic-particle of silica and aluminium oxide, though improved the stability of magnetic flow liquid to a certain extent, but owing to introduced nonmagnetic substance, caused the magnetic property of compound particle to descend, the yield strength of the feasible magnetic flow liquid of being prepared also reduces.Among the disclosed Chinese patent CN 1560209A on January 5th, 1 " guar gum magnetic flow liquid ", be technical at existing magnetic flow liquid, adopt the cluster bean rubber powder as the settlement stability agent, though cluster bean rubber powder environmental sound, to improving magnetic flow liquid stability and preventing to tie plate effect is arranged all, but because guar gum with the form adding of powder, has increased the viscosity of system to a certain extent.
Summary of the invention
The object of the present invention is to provide a kind of have low null field viscosity coefficient, high yield stress, good sedimentation resistance stability and the magnetic flow liquid of magnetic property excellence.
According to above-mentioned purpose, technical scheme of the present invention and operation principle are:
The composition of magnetic flow liquid involved in the present invention comprises: crystalline state and magnetic amorphous particle, carrier fluid and surfactant.
The present invention overcomes the deficiency of existing magnetic flow liquid, has developed a kind of magnetic flow liquid that contains crystalline state and amorphous state soft magnetic granules simultaneously.The crystalline material here is meant that atom makes the material regularly arranged, that periodic lattice structure is arranged at three dimensions, for example has the crystalline state magnetic-particle of metals such as the good iron of soft magnet performance, cobalt, nickel or its alloy, the preferred reducing carbonyl iron powder of the present invention; Amorphous material is meant that inner atom spatial arrangements is unordered, the material of no periodic lattice structure, for example has the good iron-based of soft magnet performance, iron is Ni-based and the cobalt base amorphous alloy particle, the preferred iron base amorphous magnetically-soft alloy material of the present invention.More than preferred reducing carbonyl iron powder and iron base amorphous magnetically-soft alloy material all have good soft magnet performance: magnetic permeability height, coercive force are low, the saturation magnetization height.In addition, the crystalline state magnetic-particle is a spheric granules, and the magnetic amorphous particle is ultra-fine elongated piece; Do not having under the situation in magnetic field, all these particles can form a kind of stable spacial framework in carrier fluid, have improved the sedimentation resistance stability of magnetic flow liquid effectively; And when magnetic flow liquid generation magnetic rheology effect, these particles can form solid firm chain structure, have improved the yield stress of magnetic flow liquid effectively.
Described carrier fluid is generally nonpolarity, non-volatile, and the good oil of water-free non magnetic energy is as mineral oil, silicone oil or synthetic hydrocarbon oil etc.The present invention preferentially selects poly alpha olefin for use, viscosity at ambient temperature is 1～300mPa.s, select for use poly alpha olefin to be because its not only have high viscosity index (HVI), low volatility, low pour point, high-flash, high temperature oxidation stability is good and environmentally safe oil property, because poly alpha olefin can act on mutually with more surfactant, can realize the Expected Results of additive especially.
Described surfactant can be one or more of surfactant of ionic surfactant, nonionic.Mainly contain oleic acid, Tween-20, contain copolymer D-110, phosphate ester salt F-108,8018-M-1, T152, silane coupler, titanate coupling agent, clad aluminum titanium coupling agent of acidic-group etc.Preferred titanate coupling agent of the present invention and clad aluminum titanium coupling agent.
According to above-mentioned purpose and operation principle, concrete technical scheme of the present invention is:
The magnetic flow liquid that this contains superfine amorphous muterial is characterized in that the chemical composition volume % of this magnetic flow liquid is:
Magnetic-particle accounts for 10～50%, is reducing carbonyl iron and amorphous iron base amorphous magnetically-soft alloy of crystalline state; Wherein the reducing carbonyl iron of crystalline state is spheric granules, accounts for 90～95% of magnetic-particle, and particle size range is between 1～30 μ m; Amorphous iron base amorphous magnetically-soft alloy is an elongated piece, accounts for 5～10% of magnetic-particle, and major diameter is 0.5～1 μ m, and minor axis is 200～500nm;
Carrier fluid accounts for 45～89%, is poly alpha olefin, and viscosity at ambient temperature is 1～300mPa.s;
Surfactant comprise 1～5% is titanate coupling agent and clad aluminum titanium coupling agent.
The preparation method of the magnetic flow liquid that employing of the present invention is similar to prior art:
Get magnetic-particle and surfactant mechanical stir-activating 1 hour earlier, and then add carrier fluid in this mixture, continue to stir 1 hour, more mixed sample being placed volume is that the diameter of being furnished with of 250ml is respectively 5mm, the ZrO of 3mm
2In the stainless steel jar mill of ball, ball milling 10h with abrading-ball and sample separation, promptly obtains magnetic flow liquid continuously.
The present invention has low null field viscosity coefficient, high yield stress, good sedimentation resistance stability and the advantage of magnetic property excellence compared with prior art.Be specially: sphere that magnetic flow liquid of the present invention contained and elongated piece can interact and mutually support, and form a kind of stable spacial framework, improved effectively magnetic flow liquid when zero magnetic field sedimentation stability and solidify after yield stress; In addition, crystalline state and magnetic amorphous particle also are improved on the combination property of soft magnetism than single material of planting, and have improved the performance of the magnetic flow liquid of being prepared simultaneously.Magnetic flow liquid null field viscosity of the present invention is 0.2-0.5Pa.s; Sedimentation stability is good, ties plate anything but, leaves standstill one month, and sedimentation rate is 6%-15%, and disperses very easily again; Shear yield stress under the 600mT field intensity is 7-80kPa; Rheological property is better than the magnetic flow liquid of other types.
Embodiment:
The chemical composition of magnetic flow liquid according to the present invention, adopt the preparation method of prior art, got the mechanical stir-activating of magnetic-particle and surfactant elder generation 1 hour, and then in this mixture, add carrier fluid, continue to stir 1 hour, mixed sample being placed volume is that the diameter of being furnished with of 250ml is respectively 5mm, the ZrO of 3mm again
2In the stainless steel jar mill of ball, continuous ball milling 10h is with abrading-ball and sample separation, promptly obtain magnetic flow liquid, prepared 4 batches of magnetic flow liquids, wherein table 1 is the chemical composition table of magnetic flow liquid embodiment of the present invention, and table 2 is the performance table of magnetic flow liquid embodiment test of the present invention.
Table 1 is the chemical composition table volume % of magnetic flow liquid embodiment of the present invention
| Sequence number | Add up to % | Magnetic-particle % | Carrier fluid % | Surfactant % | |||||
| Crystalline state reducing carbonyl iron | Amorphous state iron-based magnetically soft alloy | Polyalphaolefin % | Viscosity at ambient temperature mpa.s | Titanate coupling agent % | Clad aluminum titanium coupling agent % | ||||
| Spherical % particle size range 1-30 μ m | Needle-like % particle size range μ m | ||||||||
| 1 | 10 | 9 | 1 | Major diameter 0.5-1 | Minor axis 0.2-0.5 | 89 | 25.2 | 1 | / |
| 2 | 21 | 19.5 | 1.5 | 77 | / | 3 | |||
| 3 | 30 | 28 | 2 | 66 | 4 | / | |||
| 4 | 45 | 42.5 | 2.5 | 50 | 5 | / | |||
Table 2 is the test performance table of magnetic flow liquid embodiment of the present invention
| Sequence number | Null field viscosity (room temperature) Pa.s | Shear yield stress (600mT) kPa | Sedimentation rate (leaving standstill one month) %, | Redispersibility |
| 1 | 0.195 | 7 | 15 | Good, no inflexible |
| 2 | 0.25 | 33.8 | 12 | Good, no inflexible |
| 3 | 0.36 | 54.2 | 8 | Good, no inflexible |
| 4 | 0.48 | 77 | 6 | Good, no inflexible |
Claims (3)
1, a kind of magnetic flow liquid that contains superfine amorphous muterial is characterized in that the chemical composition volume % of this magnetic flow liquid is:
Magnetic-particle accounts for 10～50%, is reducing carbonyl iron and amorphous iron base amorphous magnetically-soft alloy of crystalline state;
Carrier fluid accounts for 45～89%, is poly alpha olefin, and viscosity at ambient temperature is 1～300mPa.s;
Surfactant comprise 1～5% is titanate coupling agent and clad aluminum titanium coupling agent.
2, the magnetic flow liquid that contains superfine amorphous muterial according to claim 1 is characterized in that the reducing carbonyl iron of crystalline state is spheric granules, accounts for 90～95% of magnetic-particle, and particle size range is between 1～30 μ m.
3, the magnetic flow liquid that contains superfine amorphous muterial according to claim 1 is characterized in that amorphous iron base amorphous magnetically-soft alloy is an elongated piece, accounts for 5～10% of magnetic-particle, and major diameter is 0.5～1 μ m, and minor axis is 200～500nm.
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| CNB2005101342505A CN100433205C (en) | 2005-12-15 | 2005-12-15 | Magnetic rheological fluid containing superfine amorphous muterial |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772811B (en) * | 2007-08-01 | 2013-03-13 | 洛德公司 | Non-settling diol based magnetorheological fluids |
| CN104690609A (en) * | 2014-12-05 | 2015-06-10 | 贵州西南工具(集团)有限公司 | Magnetic grinding liquid for magnetic passivation of cutting edge of cutter and preparation method of magnetic grinding liquid |
| CN105598459A (en) * | 2016-01-25 | 2016-05-25 | 广东工业大学 | Method for preparing magnetorheological fluid based on iron-based alloy micro-wire |
| CN107057810A (en) * | 2017-04-12 | 2017-08-18 | 南京理工大学 | A kind of high stability magnetic flow liquid |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0636273B1 (en) * | 1992-04-14 | 1997-08-20 | Byelocorp Scientific, Inc. | Magnetorheological fluids and methods of making thereof |
| CN1230501C (en) * | 2002-09-25 | 2005-12-07 | 重庆仪表材料研究所 | Stable magnetic rheological liquid and its preparation method |
-
2005
- 2005-12-15 CN CNB2005101342505A patent/CN100433205C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772811B (en) * | 2007-08-01 | 2013-03-13 | 洛德公司 | Non-settling diol based magnetorheological fluids |
| CN104690609A (en) * | 2014-12-05 | 2015-06-10 | 贵州西南工具(集团)有限公司 | Magnetic grinding liquid for magnetic passivation of cutting edge of cutter and preparation method of magnetic grinding liquid |
| CN105598459A (en) * | 2016-01-25 | 2016-05-25 | 广东工业大学 | Method for preparing magnetorheological fluid based on iron-based alloy micro-wire |
| CN107057810A (en) * | 2017-04-12 | 2017-08-18 | 南京理工大学 | A kind of high stability magnetic flow liquid |
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