Magnetorheological fluid composition and a process for...

Details Magnetorheological fluid composition and a process for... Magnetorheological fluid composition and a process for...

2005-04-05

2005-04-05

Koslow, C. Melissa (Department: 1755)

Compositions

Magnetic

Flaw detection or magnetic clutch

C252S062550

Reexamination Certificate

active

06875368

ABSTRACT:
The present invention relates to a magnetorheological fluid composition and a process for preparing the same, which has excellent magnetorheological properties. The fluid composition exhibits change in rheological characteristics in the presence of an external magnetic field. Further, the magnetorheological characteristics of the fluid composition can be optimised for the improved magnetic sensitivity to external magnetic field and negligible magnetic retentivity after removal of the external magnetic field. The sensitivity of the fluid to external magnetic field can be varied by varying the pure iron content of the magnetic sensitive particles composition while, the magnetic retentivity of the fluid (after removal of external magnetic field) can be varied by varying the ferrite alloy content of the same. The fluid composition utilises a magnetic sensitive particles stabiliser or surfactant, which is synthesised from the carrier fluid used in the fluid composition. The fluid composition, prepared according to this process, does not suffer from the rapid settling of the magnetic particles as it utilises a carrier fluid based surfactant, which improves the homogeneity of the fluid composition.

REFERENCES:
patent: 4992190 (1991-02-01), Shtarkman
patent: 5354488 (1994-10-01), Shtarkman et al.
patent: 5578238 (1996-11-01), Weiss et al.
patent: 6027664 (2000-02-01), Weiss et al.
patent: 6743371 (2004-06-01), John et al.

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