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A stable magnetorheological fluid

A magnetorheological fluid, stable technology, applied in the direction of lubricating composition, etc., can solve the problems of magnetic particle sedimentation, hardening, magnetic particle density difference, etc., and achieve the effects of preventing sedimentation, preventing particle adhesion and improving wear resistance.

Inactive Publication Date: 2011-11-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the magnetorheological fluid is a suspension system, there is a large density difference between the magnetic particles and the suspension medium in this system, which will cause the magnetic particles to settle or even harden in the carrier liquid, which seriously affects the settlement stability of the magnetorheological fluid. properties, chemical stability and redispersion properties, which seriously affect the stability of magnetorheological fluids in various magnetorheological devices and limit their large-scale use in engineering equipment

Method used

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  • A stable magnetorheological fluid
  • A stable magnetorheological fluid
  • A stable magnetorheological fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get the raw material of following volume fraction:

[0027] Carbonyl iron powder: 15%;

[0028] Surfactant: 0.5%, including stearic acid 0.1%, oleic acid 0.2%, Tween 0.2%;

[0029] Methyl silicone oil: 74.5%,

[0030] Additives: 10%, including 5% silicon oxide and 5% bentonite.

[0031] The preparation steps of magnetorheological fluid are as follows:

[0032] (1) Add the above-mentioned raw materials gradually into the agate ball mill jar, put a number of agate balls, and start grinding at a lower speed to mix the added raw materials; after the added raw materials are completely mixed, add the remaining ones gradually Raw materials, grind at low speed until all raw materials are added to the ball mill jar.

[0033] (2) After adding all the raw materials, keep the ball mill in a stable state, and ball mill at a low speed for several hours.

[0034] (3) Take out the magnetorheological fluid in the ball mill tank, and clean the agate ball and the agate tank.

[0035...

Embodiment 2

[0038] Get the raw material of following volume fraction:

[0039] Carbonyl iron powder: 20%;

[0040] Surfactant: 1%, including stearic acid 0.3%, oleic acid 0.3%, Tween 0.4%;

[0041] Methyl silicone oil: 74%;

[0042] Additives: 5%, including 2.5% silicon oxide and 2.5% bentonite.

[0043] Others are with embodiment 1.

Embodiment 3

[0045] Get the raw material of following volume fraction:

[0046] Carbonyl iron powder: 25%;

[0047] Surfactant: 2%, including stearic acid 0.6%, oleic acid 0.6%, Tween 0.8%;

[0048] Base silicone oil: 70%;

[0049] Additives: 3%, including 1.5% silicon oxide and 1.5% bentonite.

[0050] Others are with embodiment 1.

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Abstract

The invention relates to a stable magnetorheological fluid, which solves the problems of stability and redispersibility of the magnetorheological fluid. The stable magnetorheological fluid of the present invention includes the following raw materials in volume ratio: carbonyl iron powder 15-40%, surfactant 0.5-10%, methyl silicone oil 50-75%, additive 0.5-10%, and the above raw materials are mixed uniformly That's it. Described tensio-active agent is stearic acid or oleic acid or Tween. The additive is silicon oxide or bentonite. The magnetorheological fluid prepared by the invention exhibits excellent stability and redispersion performance. The sedimentation amount of the magnetorheological fluid is less than 5% in 24 hours, and not more than 15% in 140 hours. It has been stored for more than two years, and there is still no compaction, and it shows the same magnetorheological properties as when it was newly made. The shear stress of the magnetorheological fluid can reach 25kPa when the external magnetic field is 500mT.

Description

technical field [0001] The invention relates to the technical field of intelligent materials, in particular to a magnetorheological fluid with good sedimentation stability, chemical stability and redispersion performance, and relatively low cost. Background technique [0002] Magneto-rheological fluid is a suspension system in which magnetic particles are uniformly dispersed in a carrier liquid. This system can undergo a reversible change from Newtonian fluid to a solid-like state according to the change of the external magnetic field, accompanied by the corresponding physical and chemical properties. changes, exhibiting controllable rheological properties. Since magnetorheological fluid was first discovered by J. Rabinow in the 1940s, based on its controllable magnetorheological properties, this smart material has been widely used in engineering devices to achieve intelligent control of vibration. The practical devices developed so far include magnetorheological shock abso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M171/00
Inventor 江万权朱红龚兴龙
Owner UNIV OF SCI & TECH OF CHINA