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Durable magnetorheological fluid compositions

  • US 6,599,439 B2
  • Filed: 12/14/2000
  • Issued: 07/29/2003
  • Est. Priority Date: 12/14/1999
  • Status: Expired due to Term
First Claim
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1. 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.

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