Alliedsignal Inc.

Allied Corporation

Allied Chemical Corporation

Davidson M Nathasingh

Nicholas J DeCristofaro

Amitava Datta

John Silgailis

Alfred Freilich

Christopher A Bruckner

Ronald J Martis

Ronald Joseph Martis

Carl H Smith

The present invention is directed to a process for rapidly field annealing ferromagnetic cores and the cores produced thereby. A current is applied across a magnetizing source associated with a magnetizing core which induces a flux/voltage in the ferromagnetic core which is disposed about a leg of the magnetizing core. The flux/voltage in the second core induces a current in the second core which in turn induces a field in, and transverse to the width direction of, the ferromagnetic core. A second field may e applied to the ferromagnetic core during cooling. The cores produced display low core loss and either sheared over or square loop properties which are suitable for current and distribution type transformers respectively.

Rapid annealing method using shorted secondary technique

An amorphous metal alloy which is at least 90% amorphous having enhanced magnetic properties at elevated temperatures and consisting essentially of a composition having the formula Fe.sub.a Si.sub.b B.sub.c wherein 'a', 'b' and 'c' are atomic percentages ranging from about 79.4 to 79.8, 6 to 8 and 12 to 14, respectively, with the proviso that the sum of 'a', 'b' and 'c' equals 100.

Amorphous metal alloys having enhanced AC magnetic properties at

A method of rapidly annealing an amorphous alloy consisting of applying a magnetic field to the alloy, immersing the alloy in a liquid comprising molten tin and then placing the amorphous alloy in a cooling fluid. The cooling fluid may be an organic liquid or liquefied gas. Rapid magnetic annealing provides advantages not only of less time and energy costs, but also yields an annealed alloy that is more ductile than those of the prior art. The greater ductility permits the amorphous alloy to be annealed by this method and then rewound into a core.

Rapid magnetic annealing of amorphous metal in molten tin

A method of rapidly annealing an amorphous metal core consists of applying a magnetic field to the core, immersing the core in a hot liquid for a period of time, and then placing the core in a cooling fluid. The hot liquid is preferably a molten metal or molten metal alloy, such as molten tin or solder. The cooling fluid may be an organic liquid or liquefied gas. Rapid magnetic annealing provides advantages not only of less time and energy costs, but also yields an annealed core that is more ductile than those of the prior art. The greater ductility permits a wound core to be annealed by this method and then rewound into another core.

An iron based, boron, silicon, carbon and chromium containing magnetic alloy having at least 85 percent of its structure in the form of an amorphous metal matrix is annealed at a temperature and for a time sufficient to induce precipitation therein of discrete particles of its constituents and to form an oxide layer on the surface of the matrix. The resulting alloy has decreased high frequency core losses and increased low field permeability; is particularly suited for high frequency applications.

Amorphous alloys for electromagnetic devices

An iron based, boron, silicon, carbon and chromium containing magnetic alloy having at least 85 percent of its structure in the form of an amorphous metal matrix is annealed at a temperature and for a time sufficient to induce precipitation therein of discrete particles of its constituents and to form an oxide layer on the surface of the matrix. The resulting alloy has decreased high frequency core losses and increased low field permeability; it is particularly suited for high frequency applications.

An amorphous metal alloy which is at least 90 percent amorphous and consists essentially of a composition having the formula Fe.sub.a B.sub.b Si.sub.c C.sub.d wherein 'a', 'b', 'c' and 'd' are atomic percentages ranging from about 80.0 to 82.0, 12.5 to 14.5, 2.5 to 5.0 and 1.5 to 2.5, respectively, with the proviso that the sum of 'a', 'b', 'c' and 'd' equals 100, is annealed at a temperature ranging from 380.degree.-410.degree. C. The resulting alloy has decreased high frequency core losses and increased low field permeability; is particularly suited for high frequency applications.

Method for making iron-metalloid amorphous alloys for electromagnetic

An amorphous metal alloy which is at least 90% amorphous having enhanced magnetic properties and consisting essentially of a composition having the formula Fe.sub.a B.sub.b Si.sub.c C.sub.d wherein 'a', 'b', 'c' and 'd' are atomic percentages ranging from about 80.0 to 82.0, 12.5 to 14.5, 2.5 to 5.0 and 1.5 to 2.5, respectively, with the proviso that the sum of 'a', 'b', 'c' and 'd' equals 100.

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Stanhope, NJ, United States of America

Davidson M Nathasingh