Amorphous alloy with high magnetic induction at room temperature
AssigneeElectric Power Research Institute, Inc.
InventorsShinichiro Hatta, Takeshi Egami, Charles D. Graham, Jr.
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Abstract
An amorphous alloy including iron, carbon and boron characterized by exceptional magnetic induction properties at room temperature, rendering it particularly suitable for use as the core of a power transformer. The alloy includes 83 to 90 atomic % iron, 2 to 13 atomic % carbon, and 4 to 15 atomic % boron, the total boron and carbon content ranging from 10 to 17 atomic %. If desired, up to 10% of the iron can be replaced by cobalt or nickel, while up to 2% of the carbon can be replaced by silicon or germanium.
Claims13
An alloy with a room temperature flux density in excess of 16.5 kGauss comprising 73 to 90 atomic % iron, 0 to 10 atomic % of an element selected from the group consisting of cobalt, nickel or a combination thereof, the total iron, cobalt and nickel content ranging from 83 to 90 atomic %, and 8 to 17 atomic % of boron and carbon.
An alloy consisting essentially of 84 to 86 atomic % iron, 5 to 7 atomic % carbon, and the remainder boron, at least 90% of said alloy being in amorphous form.
A method for forming an alloy including a microstructure of at least 90% amorphous form and with a room temperature flux density in excess of 16.5 kGauss, comprising the step of annealing an alloy comprising 73 to 90 atomic % iron, 0 to 10 atomic % of an element selected from the group consisting of cobalt, nickel, or a combination thereof, the total iron, cobalt and nickel content ranging from 83 to 90 atomic %, and 8 to 17 atomic % of boron and carbon, said annealing step being performed below the crystallization temperature of said alloy.
Dependencies are inferred from the claim text.