Apparatus for producing amorphous alloy foil strip and method for producing amorphous alloy foil strip
View Patent ↗A method for producing an amorphous alloy foil strip having a large sheet thickness in an industrial scale includes: a pair of cooling rolls; a driving unit configured to rotate the pair of cooling rolls; and a crucible configured to supply a molten alloy sequentially to an outer circumferential surface of the pair of cooling rolls. The crucible is movable along a moving unit. A molten alloy is supplied alternately to the pair of cooling rolls while rotating and water-cooling the pair of cooling rolls.
1. A method for producing an amorphous alloy foil strip, comprising:
a first process of supplying a molten alloy to a first cooling zone while rotating a cooling roll, the first cooling zone forming a part of an outer circumferential portion of the cooling roll and extending along a circumferential direction of the cooling roll; and
a second process of supplying the molten alloy to a second cooling zone while rotating the cooling roll, the second cooling zone forming other part of the outer circumferential portion of the cooling roll, the second cooling zone being separated from the first cooling zone in an axial direction of the cooling roll with a heat-insulating zone interposed between the first cooling zone and the second cooling zone such that the outer circumferential surfaces of the first cooling zone, the second cooling zone and the heat-insulating zone form a continuous surface of the cooling roll, wherein the heat-insulating zone is made of a material different than the material forming the first and second cooling zones,
the first process and the second process being alternately executed.
2. The method for producing an amorphous alloy foil strip according to claim 1 , wherein
a sheet thickness of the amorphous alloy foil strip is not less than 30 μm.
3. The method for producing an amorphous alloy foil strip according to claim 1 , wherein
a composition of the molten alloy is set at a composition to satisfy content percentage of iron in a range from 70 to 81 at %, content percentage of silicon in a range from 3 to 17 at %, content percentage of boron in a range from 9 to 23 at %, and a glass transition temperature equal to or above 500° C.
4. The method for producing an amorphous alloy foil strip according to claim 3 , wherein
the molten alloy contains tin in a range from 0.01 to 1.0 mass %.
5. The method for producing an amorphous alloy foil strip according to claim 1 , wherein
a composition of the molten alloy is set at a composition to satisfy content percentage of iron in a range from 70 to 81 at %, content percentage of silicon in a range from 1 to 17 at %, content percentage of boron in a range from 7 to 23 at %, a contained amount of carbon equal to or below 2 at %, and a glass transition temperature equal to or above 500° C.
6. The method for producing an amorphous alloy foil strip according to claim 5 , wherein
the molten alloy contains tin in a range from 0.01 to 1.0 mass %.
7. The method for producing an amorphous alloy foil strip according to claim 1 , wherein
a number density of pin holes on the amorphous alloy foil strip is equal to or below 25 holes/m 2 .
8. The method for producing an amorphous alloy foil strip according to claim 1 , wherein
a width of the heat-insulating zone is set equal to or above one-third of a width of the amorphous alloy foil strip in the axial direction of the cooling roll.