Magnetorheological compositions including nonmagnetic material

A technology of non-magnetic materials and magnetic materials, which is applied in the field of magnetorheological materials, can solve the problems of magnetic particle supply and increase the cost of magnetorheological compositions, and achieve cost-effective, excellent magnetic saturation normal field yield stress, and less particle carrier Effect of Media Separation

Active Publication Date: 2012-02-08
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnetic particles with increased saturation magnetization are often not available in commercial quantities, further increasing the cost of the magnetorheological composition

Method used

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  • Magnetorheological compositions including nonmagnetic material
  • Magnetorheological compositions including nonmagnetic material
  • Magnetorheological compositions including nonmagnetic material

Examples

Experimental program
Comparison scheme
Effect test

example 19 and 20

[0107] Two additional magnetorheological compositions were formed using components having the formulations listed in Table 5. More specifically, two additional magnetorheological compositions were prepared for determining the range of increase in normal field yield stress caused by the addition of non-magnetic materials in the magnetic material and the dielectric carrier. Specifically, magnetorheological compositions were formed for each of Examples 19 and 20 by mixing the components and nominal amounts listed in Table 5 with Carrier Medium A according to the following procedure.

[0108] To form the magnetorheological compositions in Examples 19 and 20, Magnetic Material B was slowly added to Medium Carrier A and mixed using an agitator mixer for 20 to 30 minutes. The resulting mixture was agitated for at least an additional 60 minutes. Aluminized glass P or glass Q was then added to the mixture and mixed using a stirring mixer until the final mixture was homogeneous. Just ...

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Abstract

A magnetorheological composition includes a mixture of a carrier medium and a particle component disposed in the carrier medium. The particle component includes a magnetic material and a nonmagnetic material. The nonmagnetic material is present in the particle component in an amount of from about 5 to about 95 parts by volume based on 100 parts by volume of the particle component. The particle component is present in the magnetorheological composition in an amount of from about 20 to about 80 parts by volume based on 100 parts by volume of the magnetorheological composition. The magnetorheological composition has an on- state yield stress at magnetic saturation of from about 0.1 to about 100 kPa.

Description

[0001] This application claims the benefit of US Provisional Patent Application No. 61 / 158,502, filed March 9, 2009, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates generally to magnetorheological materials, and more particularly, to magnetorheological materials including non-magnetic materials. Background technique [0003] Magnetorheological compositions generally comprise a mixture of magnetic particles and a carrier medium. When a magnetorheological composition is subjected to a magnetic field, the viscosity of the magnetorheological composition typically increases significantly so that the magnetorheological composition may behave more like a solid than a liquid. That is, when not subjected to a magnetic field, ie, in an "off-state (zero magnetic field)", the magnetic particles may be substantially uniformly distributed in the carrier medium. In contrast, when subjected to a magnetic field, ie, in the "o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44
CPCH01F1/442H01F1/447
Inventor J.C.乌里克尼M.A.戈尔登K.S.斯纳威利P.马鲁尔
Owner GM GLOBAL TECH OPERATIONS LLC
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