Method of production of very thin soft magnetic alloy strip
AssigneesKabushiki Kaisha Toshiba, Masaaki Yagi
InventorsTakao Sawa, Masaaki Yagi
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Abstract
A method is disclosed for producing an extremely thin soft magnetic alloy strip, in which a molten alloy is ejected through a nozzle onto the surface of a rotating cooling member and rapidly quenched. The length of the short side of the rectangular nozzle, the distance between the nozzle and the rotating cooling member, peripheral speed of the rotating cooling member, ejecting pressure of the molten alloy, and atmosphere pressure of ejecting are specified.
Claims15
A method for producing an extremely thin soft magnetic alloy strip, comprising the steps of:
- ejecting a molten alloy through a nozzle, under a pressure of 0.015 to 0.025 kg/cm.sup.2, onto the surface of a rotating cooling member rotating at a peripheral speed in the range of 20 to 50 m/sec in an atmosphere of reduced pressure of not higher than 1.times.10.sup.-4 Torr, thereby rapidly quenching the ejected molten alloy to form a thin amorphous alloy strip, wherein said rotating cooling member is made of a Fe-based alloy or a Cu-based alloy and said nozzle has an orifice of a rectangular cross section, the short side of which is from 0.07 to 0.13 mm and is parallel to a peripheral direction of said rotating cooling member, the distance between said nozzle and said rotating cooling member being from 0.05 to 0.20 mm.
A method for producing an extremely thin soft magnetic alloy strip of an Fe-based alloy, comprising the steps of:
- melting an alloy;
- and
- ejecting said molten alloy through a nozzle, under a pressure not higher than 0.03 kg/cm.sup.2, onto the surface of a rotating cooling member rotating at a peripheral speed of not less than 20 m/sec in an atmosphere of reduced pressure of not higher than 1.times.10.sup.-2 Torr or in a He atmosphere of not higher than 60 Torr, thereby rapidly quenching said ejected molten alloy to form a thin amorphous alloy strip, wherein said nozzle has an orifice of a rectangular cross section, the short side of which is not more than 0.2 mm and falls parallel to a peripheral direction of said rotating cooling member, and the distance between said nozzle and said rotating cooling member is not more than 0.2 m.
Dependencies are inferred from the claim text.