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US 7,731,863 B2Granted
Magnetorheological fluid with a fluorocarbon thickener
OwnerVardarajan R. Iyengar, Sally M. Yurgelevic +1inventors
InventorsVardarajan R. Iyengar, Sally M. Yurgelevic, Robert T. Foister
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Abstract
A magnetorheological fluid formulation comprising magnetizable particles dispersed in carrier fluid and a thixotropic agent wherein the thixotropic agent comprises a fluorocarbon grease.
Claims23
A durable magnetorheological fluid formulation comprising:
- a carrier fluid,
- magnetizable particles dispersed in the carrier fluid,
- a conventional thixotropic agent below an efficacious amount, and
- a fluorocarbon grease wherein said fluorocarbon grease is effective to limit settling of the magnetizable particles.
1 more element
A durable magnetorheological fluid formulation comprising:
- a carrier fluid,
- magnetizable particles dispersed in the carrier fluid wherein the magnetizable particles comprise water atomized iron powder,
- a conventional thixotropic agent below an efficacious amount, and
- a fluorocarbon grease wherein said fluorocarbon grease has an NLGI grade of between 1 and 3 and is effective to limit settling of the magnetizable particles.
1 more element
A method of making an MR fluid comprising:
- blending a carrier fluid including a polyalphaolefin and a plasticizer,
- adding a fluorocarbon grease having an NLGI grade of between about 1 and 3, and
- dispersing magnetizable particles in the carrier fluid.
Dependencies are inferred from the claim text.