Method of making permanent magnets and product
AssigneeGeneral Electric Company
InventorsPeter G. Frischmann, Fred E. Luborsky, Russell E. Tompkins
Life of this patent
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Abstract
A hard magnetic article made by casting a magnetically soft amorphous metal ribbon and shaping it to the form and size of the desired permanent magnet article, and then heat treating the resulting soft magnetic body and thereby converting the metal of the ribbon to the hard magnetic state.
Claims9
The method of making a magnetically hard article having a desired shape, volume and coercive force, which comprises the steps of
- casting a magnetic alloy composition in the form of a ductile, magnetically-soft amorphous metal ribbon,
- tightly winding the ductile ribbon to build up substantially the desired article shape and volume,
- preselecting a value of coercive force to be provided to said article,
- heating said wound ribbon to a preselected temperature above the crystallizatiion temperature for said magnetic alloy, and
- maintaining said wound ribbon at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force, whereby the desired magnetically hard article results.
The method of making a magnetically-hard article having a predetermined shape, volume and coercive force, which comprises the steps of casting a magnetic alloy composition in the form of ductile, magnetically-soft amorphous metal ribbon,
- forming a three-dimensional article with such ribbon arranged in overlapping relationship,
- preselecting a value of coercive force to be provided to said article,
- heating said overlapping ribbon to a preselected temperature above the crystallization temperature for said magnetic alloy, and
- maintaining said overlapping ribbon at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force, whereby the desired magnetically-hard article results.
Dependencies are inferred from the claim text.