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Carbonyl iron powder capable of enhancing magnetorheological effect and magnetorheological fluid prepared from carbonyl iron powder

A technology of carbonyl iron powder and magnetorheological fluid, which is applied in the petroleum industry, additives, lubricating compositions, etc., can solve the problems of unfavorable popularization and application, high preparation cost, and inapplicability, and achieve improved settlement stability, low cost, Effect of Low Zero Field Viscosity

Inactive Publication Date: 2015-04-29
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of high magnetic saturation alloy material has high preparation cost, which is not conducive to popularization and application.
Tang et al [J.C.Ulicny; K.S.Snavely; M.A.Golden; D.J.Klingenberg. Enhancing magnetorheology with nonmagnetizable particles. Appl. Phys. Lett. 2010, 96, 231903-231903-3] measured the magnetorheological fluid under the action of a compressed magnetic field. static yield stress up to 800kPa, however this technique may not be suitable for most MR devices

Method used

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  • Carbonyl iron powder capable of enhancing magnetorheological effect and magnetorheological fluid prepared from carbonyl iron powder
  • Carbonyl iron powder capable of enhancing magnetorheological effect and magnetorheological fluid prepared from carbonyl iron powder
  • Carbonyl iron powder capable of enhancing magnetorheological effect and magnetorheological fluid prepared from carbonyl iron powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare 100 ml (118.3 g) of silicone oil-based magnetorheological fluid, the preparation steps are:

[0041] Step 1. Dry 78.4g of carbonyl iron powder at a vacuum of 0.1MPa and a temperature of 70°C for 12 hours to remove physically adsorbed water on the surface;

[0042] Step 2. Add 1.2g of dimer acid to 35ml of isopropanol, stir evenly, dissolve and dilute to obtain a mixed solution;

[0043] Step 3. Add the dry carbonyl iron powder to the mixed solution obtained in step 2, stir evenly and then ultrasonically disperse for 20 minutes to obtain a suspension;

[0044] Step 4. Put the suspension obtained in step 3 into a ball mill tank, and then add zirconia balls with a diameter of 10 mm. The mass ratio of the mixture material to the balls is 1:3, and ball mill at a speed of 300 rpm for 6 to 8 hours. After grinding, the ball liquid is separated;

[0045] Step 5. Place the suspension obtained in step 4 in an electric vacuum drying oven, and dry it for 6 hours at a vacuu...

Embodiment 2

[0050] Prepare 100ml (118.3g) silicone oil-based magnetorheological fluid, the preparation steps are:

[0051] Step 1. Dry 78.4g of carbonyl iron powder at a vacuum of 0.1MPa and a temperature of 70°C for 12 hours to remove physically adsorbed water on the surface;

[0052] Step 2. Add 1.2g of dodecanedioic acid into 35ml of isopropanol, stir evenly, dissolve and dilute to obtain a mixed solution;

[0053] Step 3. Add the dry carbonyl iron powder to the mixed solution obtained in step 2, stir evenly and then ultrasonically disperse for 20 minutes to obtain a suspension;

[0054] Step 4. Put the suspension obtained in step 3 into a ball mill tank, and then add zirconia balls with a diameter of 10 mm. The mass ratio of the mixture material to the balls is 1:3, and ball mill at a speed of 300 rpm for 6 to 8 hours. After grinding, the ball liquid is separated;

[0055] Step 5. Put the suspension obtained in step 4 in an electric vacuum drying oven, and dry it for 6 hours at a vacu...

Embodiment 3

[0060] Prepare 100 milliliters (117.5g) of silicone oil-based magnetorheological fluid, the preparation steps are:

[0061] Step 1. Dry 78.4g of carbonyl iron powder at a vacuum of 0.1MPa and a temperature of 70°C for 12 hours to remove physically adsorbed water on the surface;

[0062] Step 2. Put 1.2g of dimer acid into 35ml of isopropanol, stir evenly, dissolve and dilute to obtain a mixed solution;

[0063] Step 3. Add the dry carbonyl iron powder to the mixed solution obtained in step 2, stir evenly and then ultrasonically disperse for 20 minutes to obtain a suspension;

[0064] Step 4. Put the suspension obtained in step 3 into a ball mill tank, and then add zirconia balls with a diameter of 10 mm. The mass ratio of the mixture material to the balls is 1:3, and ball mill at a speed of 300 rpm for 6 to 8 hours. After grinding, the ball liquid is separated;

[0065] Step 5. Put the suspension obtained in step 4 in an electric vacuum drying oven, and dry it for 6 hours at...

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Abstract

The invention discloses carbonyl iron powder capable of enhancing the magnetorheological effect and magnetorheological fluid prepared from the carbonyl iron powder. According to the magnetorheological fluid prepared from the carbonyl iron powder, binary acid is used as the additive, and therefore the yield stress and sedimentation stability of the magnetorheological fluid are effectively improved. The preparing method of the magnetorheological fluid comprises the steps of adding the carbonyl iron powder into the mixed solution of the binary acid and isopropanol, and carrying out ultrasonic dispersion, mechanical milling and vacuum drying to obtain the carbonyl iron powder with the surface treated; adding thixotropic agents and lubricant additives into base oil in sequence to obtain carrier liquid after stirring and mixing; adding the carbonyl iron powder into the carrier liquid, carrying out ultrasonic dispersion and mechanical milling to obtain grinding balls through separation, and then obtaining the magnetorheological which is stable and efficient. The magnetorheological liquid can acquire quite high shear yield stress in a small magnetic field, and therefore the magnetorheological fluid has great application value in the automobile industry, in the measuring technique industry, in the machining industry and in the robot industry.

Description

technical field [0001] The invention belongs to the technical field of intelligent material design and preparation, and specifically relates to the preparation of magnetorheological fluid and the application technology of additives. Background technique [0002] Magnetorheological effect, that is, its viscosity, plasticity and other rheological properties will change significantly under the action of an external magnetic field, and this transformation is instantaneous and reversible, showing a controllable shear yield strength. The structure and mechanical behavior of magnetorheological fluid, especially the structure and mechanical behavior under the action of a magnetic field, has always been a research hotspot and focus in this field, and it is also a key problem that must be solved for its effective application. Over the years, the scientific and engineering circles are working hard on this. [0003] The magneto-induced yield stress of magnetorheological fluid represent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M125/12C10M141/00C10M177/00
Inventor 王雪梅杨健健晏华胡志德郭骏骏
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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