Magnetic glassy metal alloy sheets with improved soft magnetic properties
First Claim
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1. In a method of annealing a magnetic glassy metal alloy sheet by heat treatment in a magnetic field, the improvement comprising applying a magnetic field of at least about 1,000 Oersteds at an elevated temperature ranging from above about 225°
- C. to below the glass transition temperature of said metal alloy in a direction substantially normal to the sheet surface to induce a magnetization inside the sheet essentially in said direction, whereby said alloy remains glassy after said annealing.
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Abstract
A magnetic glassy metal alloy sheet is annealed at elevated temperature in a first magnetic field oriented in a direction substantially normal to the plane of the sheet. A second anneal may be performed in a weaker magnetic field in a direction substantially normal to the first field to minimize AC hysteresis losses. The annealed magnetic glassy metal alloy sheet has improved soft magnetic properties such as low hysteresis losses and may be used for transformer cores and the like.
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15 Claims
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1. In a method of annealing a magnetic glassy metal alloy sheet by heat treatment in a magnetic field, the improvement comprising applying a magnetic field of at least about 1,000 Oersteds at an elevated temperature ranging from above about 225°
- C. to below the glass transition temperature of said metal alloy in a direction substantially normal to the sheet surface to induce a magnetization inside the sheet essentially in said direction, whereby said alloy remains glassy after said annealing.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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