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Single-crystal magnetic powder and magnetorheological fluid thereof, and method

A technology of magnetorheological fluid and magnetic powder, which is applied in the field of preparing magnetorheological fluid containing single crystal magnetic powder, single crystal magnetic powder and magnetorheological fluid prepared therefrom, which can solve the lack of performance consistency and product performance degradation time and other problems, to achieve excellent thermal stability, crisp and fast response, and low viscosity

Pending Publication Date: 2020-08-21
SHENZHEN BOHAI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Another defect of existing magnetorheological fluids is that the magnetorheological fluid products on the market have deficiencies and room for improvement in terms of performance consistency and product performance degradation time

Method used

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  • Single-crystal magnetic powder and magnetorheological fluid thereof, and method
  • Single-crystal magnetic powder and magnetorheological fluid thereof, and method
  • Single-crystal magnetic powder and magnetorheological fluid thereof, and method

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preparation example Construction

[0091] image 3 It is a scanning electron microscope (SEM) photo enlarged by 10000 times of the single crystal magnetic powder particles prepared according to an embodiment of the present invention, showing the morphology of the single crystal magnetic powder particles under the magnification; Figure 4A It is a scanning electron microscope (SEM) photograph of single crystal magnetic powder particles in another size range according to an embodiment of the present invention enlarged by 10,000 times, showing the morphology of single crystal magnetic powder particles at this magnification; Figure 4B It is a scanning electron microscope (SEM) photograph magnified 10,000 times from commercially available magnetic powder particles of a comparative example for comparison with the present invention. Figure 3-4A The different sizes and morphologies of the single crystal magnetic powder particles prepared according to the present invention are shown. It can be seen that the overall ...

example 1

[0098] According to Example 1, 30 g / l of single crystal magnetic powder is provided, 28.05 g / l of α-olefin as carrier liquid, 1.2 g / l of antiwear agent, 0.3 g / l of dispersant, and 0.45 g / l of antioxidant. Stir the carrier liquid and various additives at a low speed of 300r / min for 10min, add single-crystal magnetic powder, stir at 1200r / min for 20min, and prepare a primary mixed slurry of single-crystal magnetorheological fluid with a magnetic powder ratio of about 72%. .

example 2

[0099] According to example 2, provide 30g / l of single crystal magnetic powder, 28.05g / l of α-olefin as carrier liquid, 1.2g / l of anti-wear agent, 0.3g / l of powder, and 0.45g / l of antioxidant. First, stir the carrier liquid and various additives at a low speed of 300r / min for 10min, add single crystal magnetic powder, stir at 1200r / min for 20min, and configure it as a primary mixed material of single crystal magnetorheological fluid with a magnetic powder ratio of about 50%. pulp.

[0100] Precipitation and separation process

[0101] The slurry through the primary mixing is sent to the sedimentation separator 2, such as a self-made gravity separator or centrifugal separator (such as model LW50*1100), and the particle size meets the requirements (such as about 0.1-8 microns) by gravity or centrifugal force. The particle size range, the particle size range may be different according to the specific type of single crystal magnetic powder, process requirements and application ...

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Abstract

The invention relates to single crystal magnetic powder and a magnetorheological fluid thereof, and a method, and specifically provides a magnetorheological fluid containing single crystal magnetic powder. The magnetorheological fluid comprises: single crystal magnetic powder and a fluid used as a carrier fluid, wherein the single crystal magnetic powder is dispersed and distributed in the fluid.Compared with the traditional magnetorheological fluid, the magnetorheological fluid containing the single crystal magnetic powder prepared according to the invention has huge irreplaceable advantages, wherein the material has the performance advantages of being high in specific magnetic saturation intensity, capable of obtaining high working shear stress under the same magnetic field intensity, fast in response, not prone to sedimentation, low in viscosity, low in component abrasion rate, long in service life, high in reliability, quick in response and the like.

Description

technical field [0001] The invention relates to the field of magnetorheological fluids. In particular, the present invention relates to monocrystalline magnetic powders and magnetorheological fluids prepared therefrom. The invention also relates to a method for preparing a magnetorheological fluid containing single crystal magnetic powder. Background technique [0002] A magnetorheological fluid is a fluid whose viscosity changes with the application of a magnetic field. A stable suspension system composed of soft magnetic particles with high magnetic permeability and low remanence uniformly dispersed in a non-magnetic carrier liquid through the action of surfactants. The working principle of magnetorheological fluid is: under the action of an external magnetic field, each particle is polarized into a magnetic dipole, and each dipole attracts each other, and the chain-like structure formed between the two magnetic pole plates is like a bridge. Between the plates, the norm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F41/02
CPCH01F1/44H01F41/0273
Inventor 梁燕玲秦浩
Owner SHENZHEN BOHAI NEW MATERIAL TECH CO LTD
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