Abstract: The present invention has as its object the provision of an Fe-based amorphous alloy and Fe-based amorphous alloy ribbon excellent in soft magnetic properties having a low iron loss and a high saturation magnetic flux density. The Fe-based amorphous alloy excellent in soft magnetic properties of the present invention comprises, by atom %, B: 8.0% or more and 18.0% or less, Si: 2.0% or more and 9.0% or less, C: 0.10% or more and 5.00% or less, Al: 0.005% or more and 1.50% or less, P: 0% or more and less than 1.00%, Mn: 0% or more and 0.30% or less, Fe: 78.00% or more and 86.00% or less, and balance: impurities and has an amorphous structure.

Abstract: The present invention provides an amorphous ribbon take-up roll switching and method which use a take-up device provided with a plurality of take-up rolls magnetized on their surfaces so as to take up an amorphous alloy ribbon during which it is possible to simply and inexpensively switch take-up rolls stably without ribbon breaking, uneven take-up, or other trouble regardless of the amount of take-up, that is, a method of taking up amorphous ribbon having a magnetic property cast using a cooling roll by using two or more take-up rolls, which amorphous ribbon switching method characterized by, when switching the take-up rolls, bringing the amorphous ribbon into contact with the next take-up roll and cutting the amorphous ribbon being taken up in the state with the next take-up roll brought into proximity with the cooling roll or separating the next take-up roll and the cooling roll and cutting the amorphous ribbon between the take-up roll and the next take-up roll.

Abstract: A method and apparatus are provided for producing an amorphous ribbon by ejecting and rapidly solidifying molten alloy on a circumferential surface of a rapidly rotating cooling roll, wherein the cooling roll is polished online during amorphous ribbon production. When the circumferential surface of the cooling roll after peeling off the ribbon is polished using a polishing member, the circumferential surface of the cooling roll is polished continuously or intermittently across its lateral direction while differentiating the polishing mode in accordance with the surface properties.

Abstract: The present invention provides an amorphous alloy ribbon superior in magnetic characteristics and lamination factor by defining the slip property of the amorphous alloy ribbon surface in a specific range, that is, an amorphous alloy ribbon superior in magnetic characteristics and lamination factor produced by the single roll method, characterized in that the slip property of the ribbon surface satisfies the following equation: 0.1?F=P/M?1.0 where, F is the slip friction coefficient, P is the force pulling the intermediate part of the amorphous ribbon when applying weight from above to three amorphous ribbons stacked together, and M is the load applied from the top of the amorphous ribbon (5 kg).

Abstract: The present invention provides an amorphous alloy ribbon superior in magnetic characteristics and lamination factor by defining the slip property of the amorphous alloy ribbon surface in a specific range, that is, an amorphous alloy ribbon superior in magnetic characteristics and lamination factor produced by the single roll method, characterized in that the slip property of the ribbon surface satisfies the following equation: 0.1?F=P/M?1.0 where, F is the slip friction coefficient, P is the force pulling the intermediate part of the amorphous ribbon when applying weight from above to three amorphous ribbons stacked together, and M is the load applied from the top of the amorphous ribbon (5 kg).

Abstract: The present invention provides a Fe—B—Si system amorphous alloy thin strip excellent in high magnetic flux density, thermal stability, amorphous formability improved workability and low core loss. The present invention further provides a Fe—B—Si system amorphous alloy thin strip which has the reduced cost without using high purity iron resources such as an electrolytic iron as iron resources used in an amorphous alloy thin strip, and also has core loss less than 0.10 W/kg at W13/50 in soft magnetic property in alternating-current field. The Fe—B—Si system amorphous alloy thin strip according to the present invention contains an appropriate amounts of N, C, P to improve thermal stability, amorphous formability, workability (brittleness), and core loss without deteriolating magnetic flux density, and contains, in atomic %, B: 5-25%, Si: 1-30%, N: 0.001-0.2%, C: 0.003-10%, P: 0.001-0.

Abstract: A method and apparatus are provided for producing an amorphous ribbon by ejecting and rapidly solidifying molten alloy on a circumferential surface of a rapidly rotating cooling roll, wherein the cooling roll is polished online during amorphous ribbon production. When the circumferential surface of the cooling roll after peeling off the ribbon is polished using a polishing member, the circumferential surface of the cooling roll is polished continuously or intermittently across its lateral direction while differentiating the polishing mode in accordance with the surface properties.

Abstract: The present invention provides an amorphous ribbon take-up roll switching and method which use a take-up device provided with a plurality of take-up rolls magnetized on their surfaces so as to take up an amorphous alloy ribbon during which it is possible to simply and inexpensively switch take-up rolls stably without ribbon breaking, uneven take-up, or other trouble regardless of the amount of take-up, that is, a method of taking up amorphous ribbon having a magnetic property cast using a cooling roll by using two or more take-up rolls, which amorphous ribbon switching method characterized by, when switching the take-up rolls, bringing the amorphous ribbon into contact with the next take-up roll and cutting the amorphous ribbon being taken up in the state with the next take-up roll brought into proximity with the cooling roll or separating the next take-up roll and the cooling roll and cutting the amorphous ribbon between the take-up roll and the next take-up roll.

Abstract: According to exemplary embodiments of the present invention, a process for production of an amorphous alloy can be provided at low cost by, e.g., efficiently removing magnetic-property-degrading Al and Ti when using inexpensive Fe—B or scrap as an amorphous alloy raw material. An exemplary embodiment of the process for production of an Fe-based amorphous alloy ribbon can comprise, by mass, e.g., 2 to 4% of B, 1 to 6% of Si, and a balance of Fe and unavoidable materials is provided. For example, it can be determined whether the molten alloy obtained by melting a main raw material has a Ti concentration or Al concentration of 0.005 mass % or greater: When such even occurs, iron oxide source having an iron content of 55 mass % or greater can be added thereto to reduce both Ti and Al to less than 0.005 mass % by oxidative removal. Alternatively, it is possible to determine whether the main raw material has a composition whose Ti concentration or Al concentration is 0.

Abstract: The present invention provides a Fe—B—Si system amorphous alloy thin strip excellent in high magnetic flux density, thermal stability, amorphous formability improved workability and low core loss. The present invention further provides a Fe—B—Si system amorphous alloy thin strip which has the reduced cost without using high purity iron resources such as an electrolytic iron as iron resources used in an amorphous alloy thin strip, and also has core loss less than 0.10 W/kg at W13/50 in soft magnetic property in alternating-current field. The Fe—B—Si system amorphous alloy thin strip according to the present invention contains an appropriate amounts of N, C, P to improve thermal stability, amorphous formability, workability (brittleness), and core loss without deteriolating magnetic flux density, and contains, in atomic %, B: 5-25%, Si: 1-30%, N: 0.001-0.2%, C: 0.003-10%, P: 0.001-0.

Abstract: The present invention provides liquid phase diffusion bonding alloy foils capable of bonding in an oxidizing atmosphere, which can ensure joints with a homogeneous structure and adequate tensile strength in air in a short period of time using various alloys or Fe-based materials as materials to be bonded; specifically, they are Ni-based liquid phase diffusion bonding alloy foils with compositions comprising as essential components in terms of atomic percent, the diffusion elements B or P at 1.0-20.0% or B and P each at 1.0-20.0%, and Si at 0.5 to ≦15% or 0.5 to <10% and V at 0.1-20.0%, with the remainder substantially Ni and unavoidable impurities, and having a thickness of 3-100 &mgr;m. If necessary, one or more types of Cr, Mn or Mo, Co, and/or one or more types of W, Nb and Ti may be selectively included as appropriate. Compositions with a substantially amorphous crystal structure are most effective.

Abstract: A method for supplying molten metal alloy for producing thin amorphous metal wire or thin amorphous metal strip by liquid quenching and solidification on a moving cooling substrate controls the flow of molten metal from a ladle into a tundish. The ladle has a long nozzle with an interior passage for providing flow of molten metal alloy into the tundish. The ladle stopper has a distal end region received by the interior passage of the long nozzle. Control of the overlap between the distal end region of the ladle stopper received in the long nozzle during molten alloy flow and control of the sectional flow area provided in the long nozzle interior passage controls the flow quantity of molten alloy from the ladle into the tundish.

Abstract: The present invention provides an Fe-based alloy foil for liquid phase diffusion bonding of Fe-based material by enabling bonding in oxidizing atmospheres at relatively high bonding temperatures to minimize thermal influence on the base material (the material to be bonded) and, thereby, ensures production of a bonded joint having a uniform microstructure and a good bonded joint strength and enables reduction in the bonding time. The Fe-based alloy foil contains, as essential elements, one of 1.0 to 20.0% P and 1.0 to 20.0% B, 1.0 to 20.0% Si, and 0.1 to 20.0% V, in terms of atomic percentage, the balance substantially of Fe and unavoidable impurities, and has a thickness of 3.0 to 100 .mu.m. Alternatively, the Fe-based alloy foil contains, as essential elements, 1.0 to 20.0% P, 1.0 to 20.0% Si, and 0.1 to 20.0% V, and 1.0 to 20.0% B, in terms of atomic percentage, the balance substantially of Fe and unavoidable impurities, and has a thickness of 3.0 to 200 .mu.m.

Abstract: A method for supplying molten metal alloy for producing thin amorphous metal wire or thin amorphous metal strip by liquid quenching and solidification on a moving cooling substrate controls the flow of molten metal from a ladle into a tundish. The ladle has a long nozzle with an interior passage for providing flow of molten metal alloy into the tundish. The ladle stopper has a distal end region received by the interior passage of the long nozzle. Control of the overlap between the distal end region of the ladle stopper received in the long nozzle during molten alloy flow and control of the sectional flow area provided in the long nozzle interior passage controls the flow quantity of molten alloy from the ladle into the tundish.

Abstract: A conveyor moves forward an unconcentrically spiralled loose coil of steel wire rod having a temperature not lower than Ar.sub.3 into a retention bath of molten salt for heat treatment. Just before entering the retention bath, the coil is quenched by spraying a solution of molten salt kept at a temperature between 400.degree. and 600.degree. C. and not higher than the temperature of the retention bath either from above and below or from only above the coil. Then, the quenched coil is retained in the retention bath of molten salt kept at a temperature between 400.degree. and 600.degree. C., thereby causing pearlite transformation and forming a fine pearlite structure in the wire rod.