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High magnetic permeability composites containing fibers with ferrite fill

  • US 4,725,490 A
  • Filed: 05/05/1986
  • Issued: 02/16/1988
  • Est. Priority Date: 05/05/1986
  • Status: Expired due to Fees
First Claim
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1. A composite material having enhanced magnetic permeability comprising a non-magnetic matrix material and nonconducting fibers dispersed in said matrix material at a volume concentration less than 30% with respect to the matrix material, said fibers having an average aspect ratio of at least 20, said fibers having ferrite particulates therein at a concentration above the percolation threshold of said ferrite material in said fiber, and said fibers having longitudinal axes oriented randomly with respect to one another, so that the magnetic permeability of the composite is approximately proportional to the product of the magnetic permeability of the ferrite and the volume percent of ferrite material in the composite.

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