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US 6,599,439 B2Granted
Durable magnetorheological fluid compositions
AssigneeDelphi Technologies, Inc.
InventorsVardarajan R. Iyengar, Robert T. Foister
Life of this patent
Estimating the term…
Abstract
A durable magnetorheological fluid suitable for use in high compression vibration dampening devices comprising mechanically hard magnetizable particles of unreduced carbonyl iron, cobalt-iron alloys, or mixtures thereof, a carrier fluid of a mixture of polyalphaolefin and a plasticizer, unreduced fumed silica and optionally an ethoxylated amine.
Claims11
A durable magnetorheological fluid comprising:
- a. a magnetizable particle component consisting of mechanically hard magnetizable particles having a hardness greater than B50 on the Rockwell scale and a particle size less than about 10 microns that is selected from the group consisting of unreduced carbonyl iron particles, cobalt iron alloy particles, and mixtures thereof;
- b. a carrier fluid consisting essentially of polyalphaolefin and a plasticizer;
- c. untreated fumed silica;
- and
- d. an ethoxylated amine.
2 more elements
A durable magnetorheological fluid comprising:
- a. mechanically hard magnetizable particles having a hardness greater than B50 on the Rockwell scale and a particle size less than about 10 microns that is selected from the group consisting of unreduced carbonyl iron particles, cobalt iron alloy particles, and mixtures thereof;
- b. a carrier fluid consisting essentially of a mixture of a dimer of dodecene and dioctyl sebacate;
- c. untreated fumed silica having a surface area of between about 300 m2/g to about 350 m2/g;
- and
- d. an ethoxylated amine.
2 more elements
A magnetorheological fluid comprising:
- a. mechanically hard magnetizable particles of unreduced carbonyl iron having a hardness of about C65 on the Rockwell Scale and an average particle size of about 1 to 2 microns;
- b. a carrier fluid consisting essentially of a mixture of a dimer of 1-dodecene and dioctyl sebacate in a volume ratio of 4;
- c. untreated fumed silica having a surface area of greater than about 350 m2/g;
- and
- d. an ethoxylated amine.
2 more elements
Dependencies are inferred from the claim text.