Powder and electrorheological fluid

Details Powder and electrorheological fluid Powder and electrorheological fluid

1991-04-10

1993-10-12

Skane, Christine

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

252 73, 252 74, 252 75, 252510, 252572, C10M16900, C10M16904

Patent

active

052522490

ABSTRACT:
A powder having improved oxidation resistance and controlled electrical properties is obtained by dispersing minute particulates in a matrix phase to form composite particles. The minute particulates may be distributed uniformly or non-uniformly such that the particulates are dense near the surface and sparse near the center of each particle or inversely. The matrix phase has a moderate conductivity of 10.sup.-10 to 10.sup.2 Scm.sup.-1, and the dispersed particulates have a low conductivity of up to 1/10 of that of the matrix phase, typically up to 10.sup.-2 Scm.sup.-1. Alternatively, the matrix phase has a lower conductivity and the dispersed particulates have a moderate conductivity. The powder is dispersed in an insulating oily medium to form an electrorheological fluid.

REFERENCES:
patent: 3923697 (1975-12-01), Ellis
patent: 4110260 (1978-08-01), Yamamoto et al.
patent: 4224068 (1980-09-01), Harvey
patent: 4282117 (1981-08-01), Muramoto et al.
patent: 4786438 (1988-11-01), Blackmore
patent: 4795735 (1989-01-01), Liu et al.
patent: 4816184 (1989-03-01), Fukuda et al.
patent: 4865772 (1989-09-01), Suehiro et al.
patent: 4958998 (1990-09-01), Yamauchi et al.
Translation of Japanese Patent 1-180240, published Jul. 18, 1989.

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