Allied Chemical Corporation

Ethan Allen Nesbitt

Lewis Isaac Mendelsohn

Robert C O'Handley

Kevin James Durand

A flexible electromagnetic shield is provided. The shield comprises interlaced filaments of at least one glassy metal alloy. The glassy alloy has a maximum permeability of at least about 25,000 and a coercivity of less than about 0.08 Oe.

Flexible electromagnetic shield comprising interlaced glassy alloy

A process is provided for improving magnetic properties of certain glassy metal alloys which comprises immersing toroidally wound cores of glassy metal alloy filaments in a thermally stable, nonferromagnetic, electrically inert and chemically unreactive liquid, maintaining the liquid at a temperature of between about 310.degree. and 350.degree. C for about 3/4 to 8 hrs., depending on the temperature selected, and cooling the filament to about 25.degree. C at a rate not greater than about 30.degree. C/min. through its Curie temperature. Optionally, a magnetic field of about 1 to 10 Oe may be applied circumferentially around the cores during cooling through the Curie temperature to further improve the magnetic properties of the glassy metal alloy.

Heat treatment of iron-nickel-phosphorus-boron glassy metal alloys

A new series of glassy metal alloys with near-zero magnetostriction is disclosed. The glassy alloys have the composition (Co.sub.x Fe.sub.1.sub.-x).sub.a B.sub.b C.sub.c, where x ranges from about 0.84 to 1.0, a ranges from about 78 to 85 atom percent, b ranges from about 10 to 22 atom percent and c ranges from 0 to 12 atom percent, with the proviso that the sum of b and c ranges from about 15 to 22 atom percent. The magnetostriction of these alloys ranges from about +5 .times. 10.sup.-.sup.6 to -5 .times. 10.sup.-.sup.6 and the saturation induction is at least about 10 kGauss. The transition metal content is responsible for the low magnetostriction in these alloys, as well as their high saturation induction. The metalloid content (needed to stabilize the glassy state which is one of low anisotropy) strongly affects the saturation induction and Curie temperature, but not the magnetostriction.

Near-zero magnetostrictive glassy metal alloys with high saturation

A flexible electromagnetic shield is provided. The shield comprises interlaced filaments of at least one glassy metal alloy. The glassy alloy has a maximum permeability of at least about 50,000 and a coercivity of less than about 0.08 Oe.

Growing community of inventors

Beach Haven, NJ, United States of America

Ethan Allen Nesbitt