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Magneto-rheological fluid

A magnetorheological fluid, carrier fluid technology, applied in the petroleum industry, additives, lubricating compositions, etc., can solve the problems of not the best adjustability of shear yield stress, not optimal shear yield stress, etc. Settlement stability, improved shear yield stress, good stability effect

Inactive Publication Date: 2010-05-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnetorheological fluids using nano-sized magnetic particles or micron-sized magnetic particles alone have suboptimal shear yield stress of magnetorheological fluids and poor adjustability of shear yield stress relative to zero-field viscosity Reality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: Take 225 grams of micron-scale carbonyl iron powder and 15 grams of nano-scale carbonyl iron powder after surface treatment, and 49.5 grams of transformer oil. 1.5 grams of solid lubricant graphite, 1.8 grams of thixotropic organic bentonite, 3 grams of dispersant polyvinylpyrrolidone, and 1.2 grams of antioxidant phenyl-α-naphthylamine.

example 2

[0024] Example 2: Take 232.5 grams of micron-scale carbonyl iron powder and 7.5 grams of nano-scale carbonyl iron powder after surface treatment, and 49.5 grams of vegetable oil. 1.5 grams of graphite as a solid lubricant, 1.8 grams of organic bentonite as a thixotropic agent, 3 grams of polyvinylpyrrolidone as a dispersant, and 1.2 grams of phenyl-α-naphthylamine as an antioxidant.

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PUM

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Abstract

The invention discloses a high-performance magneto-rheological fluid, which comprises the following materials in percentage by weight of the magneto-rheological fluid: 50 to 80 percent of mixed magnetic granules of nano-scale carbonyl iron powder and carbonyl iron powder, 10 to 40 percent of carrier liquid, 0.5 to 2 percent of surfactant, 0.5 to 2 percent of thixotropic agent, 0.5 to 2 percent of antioxidant, 0.5 to 2 percent of solid lubricant, and 0.5 to 2 percent of dispersant. The high-performance magneto-rheological fluid of the invention has good anti-settling stability; and after the magneto-rheological fluid is stood for 1 year, the magneto-rheological fluid still has good stability and anti-settling property by observing the stability thereof. Meanwhile, the shear yield stress of the magneto-rheological fluid is obviously improved, and the shear yield stress of the high-performance magneto-rheological fluid can reach 60 kPa under an external magnetic field (1T).

Description

technical field [0001] The invention is a high-performance magnetorheological fluid for intelligent vibration reduction (shock) of aerospace, machinery, vehicles or civil engineering structures. Background technique [0002] Magneto-rheological fluid is a new type of intelligent material. Magnetorheological fluid is composed of magnetic particles, carrier liquid and stabilizer. It is a non-colloidal suspension liquid with controllable rheological characteristics as the external magnetic field changes. Magneto-rheological dampers, which are widely used in engineering, are made by making full use of the adjustable intelligent characteristics of magnetorheological fluids, so the performance of magnetorheological fluids directly affects the performance of dampers. [0003] The main problems of magnetorheological fluids at present are the sedimentation and stability problems caused by the long-term standing and the large specific gravity difference between the media. , but the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M125/12C10N40/14
Inventor 徐赵东冉成崧
Owner SOUTHEAST UNIV
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