EP0086485B1 - Wound iron core - Google Patents

Wound iron core Download PDF

Info

Publication number
EP0086485B1
EP0086485B1 EP19830101409 EP83101409A EP0086485B1 EP 0086485 B1 EP0086485 B1 EP 0086485B1 EP 19830101409 EP19830101409 EP 19830101409 EP 83101409 A EP83101409 A EP 83101409A EP 0086485 B1 EP0086485 B1 EP 0086485B1
Authority
EP
European Patent Office
Prior art keywords
core
iron core
wound
wound iron
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19830101409
Other languages
German (de)
French (fr)
Other versions
EP0086485A3 (en
EP0086485A2 (en
Inventor
Yasunobu Ogata
Yoshizo Sawada
Yoshihito Yoshizawa
Yasuo Arai
Shunsuke Arakawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Publication of EP0086485A2 publication Critical patent/EP0086485A2/en
Publication of EP0086485A3 publication Critical patent/EP0086485A3/en
Application granted granted Critical
Publication of EP0086485B1 publication Critical patent/EP0086485B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co

Definitions

  • the present invention relates to a wound core having toroidal shape and being formed by winding a thin strip of a Co-base amorphous alloy and annealing the wound core in a magnetic field.
  • U.S. Patent 4 116 728 discloses a method for treating amorphous magnetic alloys to produce a wide range of magnetic properties. It reports that a (Ni, Fe, Co) 0,75 (P, B, AI) o , 2s alloy has a low coercive force and that annealing of a zero magnetostrictive composition reduces the coercive force to 1 A/m.
  • Wound iron cores made of, for example, anisotropic 50% Ni permalloy, supermalloy, directional silicon steel or the like material are finding use in magnetic phase shifters magnetic amplifiers, D.C. current detectors, magnetic modulators and nowadays in a switching power source carrying a magnetic amplifier.
  • these conventional wound iron cores have a large rectangle ratio Br/B lo in the B-H hysteresis curve.
  • the wound iron core is used at a high frequency of an order of several tens of kilohertz (KHz) or higher.
  • KHz kilohertz
  • the 50% Ni permalloy which is one of the conventionally used materials, exhibits a coercive force Hc which is as large as 8 A/m to cause a large loss in the core resulting in a large heat generation.
  • Hc coercive force
  • the core of permalloy system such as of 50% Ni permalloy, supermalloy and so forth has a high sensitivity to strain of the magnetic material, so that the magnetic property is deteriorated seriously due to mechanical strain incurred during handling, transportation and winding or coiling thereby making it impossible to attain the expected performance of the wound iron core and the electric balance.
  • these conventional materials for forming the wound iron core are producible only through a careful and complicated process having the steps such as melting, ingot making, hot rolling, pickling, cold rolling and so forth, so that the production cost is raised uneconomically.
  • an object of the invention is to provide a less-expensive wound core having a rectangle ratio Br/B io equivalent to that of ordinarily used 50% Ni permalloy and smaller coercive force than the same, while offering various advantages such as superior stability against strain and a high impact resistance, as well as easiness in heat treatment for attaining the rectangular hysteresis property, thereby to overcome the above-described problems of the prior art.
  • the attached sole Figure shows a D.C. hysteresis curve as obtained with a wound core of the invention formed from a Co-base amorphous alloy strip, in comparison with that exhibited by a wound iron core made from a conventional Fe-base material.
  • a Co-base amorphous alloy exhibits a magnetostriction of zero or substantially zero and, hence, a small magnetic anisotropy in the quenched state, which in turn facilitates the uniform and unidirectional magnetization by an external magnetic field during the annealing which is conducted under the influence of the magnetic field to attain a superior rectangular hysteresis property. It is, therefore, possible to attain a distinguished rectangular hysteresis property much more easily than in the case where an amorphous Fe-base alloy which tends to exhibit a large magnetostriction is used as the material.
  • the small magnetostriction permits also a reduction in the coercive force down to a level below 1/10 of that presented by ordinarily used 50% Ni permalloy and below 1/2 of that presented by ordinarily used amorphous Fe-base alloy.
  • the Co-base amorphous alloy has been used mainly as the material of magnetic heads.
  • a wound iron core simultaneously exhibiting a large value of the rectangle ratio Br/B lo and a low coercive force Hc is obtainable by a process which has the steps of preparing a strip of an amorphous alloy having a composition expressed by Co 100-a-b-c X a Si b B c , where X represents one, two or more elements selected from the group consisting of Ti, V, Cr, Mn, Fe, Ni, Zr, Nb, Mo, Ru, Hf, Ta, W, Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy, and satisfying the conditions of O ⁇ a ⁇ 15 (atomic %) 10 ⁇ b ⁇ 20 (atomic %) and 7 ⁇ c ⁇ 10 (atomic %), winding the strip into the form of a core and annealing the core in a magnetic field having a direction substantially coincident with the direction of the magnetic path in the core.
  • Metalloid or semimetal elements such as C, Si, B, P, Ge and AI are known as elements for forming amorphous structure.
  • the content of such elements is preferably not greater than 5 atom %.
  • the B content should be selected to be not greater than 10 atom % but the B content should not be reduced down below 7 atom % for otherwise the amorphous structure will not be obtained. Any Si content less than 10 atom % and not smaller than 20 atom % is not preferred because such an Si content will seriously deteriorate the thermal stability and increase the coercive force undesirably.
  • the content of the element X which serves as the transition metal element should be selected to be not greater than 15 atom %, because X content above 15% undesirably increases the magnetostriction ⁇ s to a level of 1 Ox 10- 6 or greater.
  • Elements other than Fe, Ni and Mn when added by an amount smaller than 15 atom %, reduces the magnetostriction nearly to zero and improves the ability for forming the amorphous structure advantageously.
  • the elements X particularly Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy, improves the hardness and, in addition, provides a higher thermal stability through raising the crystallization temperature.
  • the expected rectangular hysteresis property can be obtained also when the Co-base amorphous alloy strip of above-specified composition is annealed in a magnetic field the direction of which usually coincides with the longitudinal direction of the strip.
  • a Co-base amorphous alloy strip of 55 mm wide was prepared to have a composition expressed by (CO 0.94 Fe 0.06 ) 76.5 Si 14 B 9.5 .
  • the strip was wound in a substantially toroidal form into a wound iron core having an outside diameter of 35 mm and an inside diameter of 25 mm.
  • the wound iron core was subjected to an annealing which was conducted at 320°C for 1 hour in a circumferentially directed magnetic field of 4000 A/m.
  • the properties of the thus produced wound iron core are shown in Table 1 and Fig. 1 in comparison with those of wound iron cores produced from conventionally used 50% Ni permalloy and supermalloy.
  • the wound iron core of Fe-base amorphous alloy appearing in Table 1 and Fig. 1 was made from an alloy having a composition expressed by Fe 71 Ni 10 Si 10 B 9 and had been subjected to an optimum annealing conducted in a magnetic field of 4000 A/m as in the case of the iron core of the invention.
  • the wound iron core of the invention formed from Co-base amorphous alloy exhibits a superior rectangle ratio Br/B io of 96%, and a coercive force which is as small as less than 1/10 of that exhibited by the iron core formed from conventionally used 50% Ni permalloy.
  • the wound core made from the strip of Co-base amorphous metal alloy is quite superior to the known wound iron core made from an Fe-base amorphous alloy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Description

  • The present invention relates to a wound core having toroidal shape and being formed by winding a thin strip of a Co-base amorphous alloy and annealing the wound core in a magnetic field.
  • U.S. Patent 4 116 728 discloses a method for treating amorphous magnetic alloys to produce a wide range of magnetic properties. It reports that a (Ni, Fe, Co)0,75 (P, B, AI)o,2s alloy has a low coercive force and that annealing of a zero magnetostrictive composition reduces the coercive force to 1 A/m.
  • Wound iron cores made of, for example, anisotropic 50% Ni permalloy, supermalloy, directional silicon steel or the like material are finding use in magnetic phase shifters magnetic amplifiers, D.C. current detectors, magnetic modulators and nowadays in a switching power source carrying a magnetic amplifier. As is well known, these conventional wound iron cores have a large rectangle ratio Br/Blo in the B-H hysteresis curve. Recently, however, there is an increasing demand for a wound iron core which exhibits not only a large rectangle ratio Br/Blo but also a small coercive force Hc.
  • In a switching power source carrying a magnetic amplifier, the wound iron core is used at a high frequency of an order of several tens of kilohertz (KHz) or higher. The 50% Ni permalloy, which is one of the conventionally used materials, exhibits a coercive force Hc which is as large as 8 A/m to cause a large loss in the core resulting in a large heat generation. This gives a rise to a demand for a wound iron core having a rectangle ratio Br/Bnj equivalent to that of the 50% Ni permalloy and a coercive force Hc smaller than that of the same.
  • Among the wound iron cores used hitherto, the core of permalloy system such as of 50% Ni permalloy, supermalloy and so forth has a high sensitivity to strain of the magnetic material, so that the magnetic property is deteriorated seriously due to mechanical strain incurred during handling, transportation and winding or coiling thereby making it impossible to attain the expected performance of the wound iron core and the electric balance. In addition, these conventional materials for forming the wound iron core are producible only through a careful and complicated process having the steps such as melting, ingot making, hot rolling, pickling, cold rolling and so forth, so that the production cost is raised uneconomically.
    • Summary of the invention
  • Accordingly, an object of the invention is to provide a less-expensive wound core having a rectangle ratio Br/Bio equivalent to that of ordinarily used 50% Ni permalloy and smaller coercive force than the same, while offering various advantages such as superior stability against strain and a high impact resistance, as well as easiness in heat treatment for attaining the rectangular hysteresis property, thereby to overcome the above-described problems of the prior art.
  • The invention is given according to claim 1.
  • Above and other objects, features and advantages of the invention will become clear from the following description of the preferred embodiment of the invention taken in conjunction with the attached drawing.
    • Brief description of the drawing
  • The attached sole Figure shows a D.C. hysteresis curve as obtained with a wound core of the invention formed from a Co-base amorphous alloy strip, in comparison with that exhibited by a wound iron core made from a conventional Fe-base material.
    • Description of the preferred embodiment
  • Generally, a Co-base amorphous alloy exhibits a magnetostriction of zero or substantially zero and, hence, a small magnetic anisotropy in the quenched state, which in turn facilitates the uniform and unidirectional magnetization by an external magnetic field during the annealing which is conducted under the influence of the magnetic field to attain a superior rectangular hysteresis property. It is, therefore, possible to attain a distinguished rectangular hysteresis property much more easily than in the case where an amorphous Fe-base alloy which tends to exhibit a large magnetostriction is used as the material. The small magnetostriction permits also a reduction in the coercive force down to a level below 1/10 of that presented by ordinarily used 50% Ni permalloy and below 1/2 of that presented by ordinarily used amorphous Fe-base alloy.
  • Hitherto, the Co-base amorphous alloy has been used mainly as the material of magnetic heads. No proposal nor attempt has been made up to now as to the use of the Co-base amorphous alloy in place of the 50% Ni permalloy as the magnetic core for the wound iron core, by realizing a rectangular hysteresis property through an annealing of the core in a magnetic field the direction of which is substantially coincident with the direction of the magnetic path in the core.
  • The present inventors have found that a wound iron core simultaneously exhibiting a large value of the rectangle ratio Br/Blo and a low coercive force Hc is obtainable by a process which has the steps of preparing a strip of an amorphous alloy having a composition expressed by Co100-a-b-cXaSibBc, where X represents one, two or more elements selected from the group consisting of Ti, V, Cr, Mn, Fe, Ni, Zr, Nb, Mo, Ru, Hf, Ta, W, Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy, and satisfying the conditions of O≦a≦15 (atomic %) 10≦b≦20 (atomic %) and 7≦c≦10 (atomic %), winding the strip into the form of a core and annealing the core in a magnetic field having a direction substantially coincident with the direction of the magnetic path in the core.
  • Metalloid or semimetal elements such as C, Si, B, P, Ge and AI are known as elements for forming amorphous structure. However, for attaining a high thermal stability and toughness, it is preferred to use a combination of Si and B. Although the effect of the invention is not affected seriously by the presence of C, P, Ge or Al, the content of such elements is preferably not greater than 5 atom %. When a specifically high resistance to environmental condition, e.g. a specifically high moisture proof or anti-alkali property is required, the B content should be selected to be not greater than 10 atom % but the B content should not be reduced down below 7 atom % for otherwise the amorphous structure will not be obtained. Any Si content less than 10 atom % and not smaller than 20 atom % is not preferred because such an Si content will seriously deteriorate the thermal stability and increase the coercive force undesirably.
  • The content of the element X which serves as the transition metal element should be selected to be not greater than 15 atom %, because X content above 15% undesirably increases the magnetostriction λs to a level of 1 Ox 10-6 or greater. Elements other than Fe, Ni and Mn, when added by an amount smaller than 15 atom %, reduces the magnetostriction nearly to zero and improves the ability for forming the amorphous structure advantageously. The elements X, particularly Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy, improves the hardness and, in addition, provides a higher thermal stability through raising the crystallization temperature.
  • The expected rectangular hysteresis property can be obtained also when the Co-base amorphous alloy strip of above-specified composition is annealed in a magnetic field the direction of which usually coincides with the longitudinal direction of the strip.
  • Although direct electric current has been used hitherto for forming the external magnetic field during the annealing, an effect almost equivalent to that produced by the direct electric current is obtainable when an electric current obtained by a half-wave rectification or even alternating current (commercial frequency) is used for the formation of the magnetic field.
  • The advantage of the invention will be fully realized from the following description of example.
    • Example 1
  • A Co-base amorphous alloy strip of 55 mm wide was prepared to have a composition expressed by (CO0.94Fe0.06)76.5Si14B9.5. The strip was wound in a substantially toroidal form into a wound iron core having an outside diameter of 35 mm and an inside diameter of 25 mm. The wound iron core was subjected to an annealing which was conducted at 320°C for 1 hour in a circumferentially directed magnetic field of 4000 A/m. The properties of the thus produced wound iron core are shown in Table 1 and Fig. 1 in comparison with those of wound iron cores produced from conventionally used 50% Ni permalloy and supermalloy. The wound iron core of Fe-base amorphous alloy appearing in Table 1 and Fig. 1 was made from an alloy having a composition expressed by Fe71Ni10Si10B9 and had been subjected to an optimum annealing conducted in a magnetic field of 4000 A/m as in the case of the iron core of the invention.
    Figure imgb0001
  • From Table 1, it will be seen that the wound iron core of the invention formed from Co-base amorphous alloy exhibits a superior rectangle ratio Br/Bio of 96%, and a coercive force which is as small as less than 1/10 of that exhibited by the iron core formed from conventionally used 50% Ni permalloy.
  • The wound core made from the strip of Co-base amorphous metal alloy is quite superior to the known wound iron core made from an Fe-base amorphous alloy.
  • As has been described, according to the invention it is possible to produce easily a wound core having a distinguished performance over known wound iron cores, thereby to offer a great advantage in the field of industry concerned.

Claims (2)

1. A wound core having toroidal shape and being formed by winding a thin strip of a Co-base amorphous magnetic alloy and annealing the wound strip in a magnetic field coincident with the magnetic path in the core, characterized in that said strip has a composition which is expressed by CO100-a-b-cXaSibBc, wherein X represents at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Ni, Zr, Nb, Mo, Ru, Hf, Ta, W, Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy, and wherein a, b and c are numbers satisfying the following relations: O≦a≦15 (atomic %), 10≦b≦20 (atomic %), and 7≦c≦10 (atomic %).
2. The wound core of claim 1, characterized in that the core has a rectangular ratio Br/Blo of 85% or higher in D.C. hysteresis curve.
EP19830101409 1982-02-15 1983-02-14 Wound iron core Expired EP0086485B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP22349/82 1982-02-15
JP57022349A JPS58139408A (en) 1982-02-15 1982-02-15 Wound iron core

Publications (3)

Publication Number Publication Date
EP0086485A2 EP0086485A2 (en) 1983-08-24
EP0086485A3 EP0086485A3 (en) 1985-05-15
EP0086485B1 true EP0086485B1 (en) 1987-11-11

Family

ID=12080181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830101409 Expired EP0086485B1 (en) 1982-02-15 1983-02-14 Wound iron core

Country Status (3)

Country Link
EP (1) EP0086485B1 (en)
JP (1) JPS58139408A (en)
DE (1) DE3374481D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104109822A (en) * 2014-06-05 2014-10-22 同济大学 A Ni-containing cobalt-based amorphous giant magneto-impedance alloy thin strip and a preparing method thereof
CN105112816A (en) * 2015-08-03 2015-12-02 河北工业大学 Preparation method of Si-doped low-Sm-content Sm-Co amorphous matrix magnetic alloy

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59150414A (en) * 1982-12-23 1984-08-28 Toshiba Corp Reactor for semiconductor circuit
JPS61292301A (en) * 1985-06-20 1986-12-23 Hitachi Metals Ltd Winding magnetic core
JPH0777008B2 (en) * 1985-06-21 1995-08-16 株式会社日立製作所 Magnetic head using amorphous alloy film
JPS62124703A (en) * 1985-11-25 1987-06-06 Mitsui Petrochem Ind Ltd Current sensor
EP0414974B1 (en) * 1989-09-01 1994-12-28 Masaaki Yagi Thin soft magnetic alloy strip
US5639566A (en) * 1990-09-28 1997-06-17 Kabushiki Kaisha Toshiba Magnetic core
EP0503081B1 (en) * 1990-09-28 1996-06-12 Kabushiki Kaisha Toshiba Magnetic core
DE59706990D1 (en) * 1996-09-17 2002-05-16 Vacuumschmelze Gmbh PULSE TRANSMITTER FOR U-INTERFACES ACCORDING TO THE ECHOCOMPENSATION PRINCIPLE
DE19651525A1 (en) * 1996-12-11 1998-06-18 Vacuumschmelze Gmbh Labels in acustomagnetic anti-theft systems
KR100767719B1 (en) 2006-08-29 2007-10-17 한국과학기술연구원 Ti-based amorphous nano-powders and method of preparation thereof
CN102360670B (en) * 2011-10-24 2014-01-08 南京信息工程大学 Composite material with ferrite magnetic layer and amorphous soft magnetic core as well as preparation method thereof
CN104465063B (en) * 2014-12-20 2017-05-31 泉州惠安长圣生物科技有限公司 A kind of preparation method of corrosion-resistant iron silicon substrate magnetic core
CN106702245B (en) * 2016-12-20 2019-01-18 华南理工大学 A kind of Gd-Co based amorphous nano magnetic refrigerating material and preparation method thereof
CN110400670B (en) * 2019-04-18 2021-07-30 江西大有科技有限公司 High-squareness-ratio cobalt-based amorphous alloy iron core and preparation method thereof
CN110616386B (en) * 2019-09-12 2021-08-10 东南大学 High magnetocaloric effect rare earth based high-entropy amorphous alloy and preparation method thereof

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7511398L (en) * 1974-10-21 1976-04-22 Western Electric Co MAGNETIC DEVICE
US4116728B1 (en) * 1976-09-02 1994-05-03 Gen Electric Treatment of amorphous magnetic alloys to produce a wide range of magnetic properties
JPS581183B2 (en) * 1976-09-16 1983-01-10 東北大学金属材料研究所長 High magnetic permeability amorphous alloy with high magnetic flux density and large squareness ratio
NL176090C (en) * 1977-02-26 1985-02-18 Vacuumschmelze Gmbh METHOD FOR REDUCING THE MAGNETICIZATION LOSSES IN THIN-WEEK-MAGNETIC AMORPHIC METAL ALLOYS.
JPS5441223A (en) * 1977-09-08 1979-04-02 Noboru Tsuya Magnetic characteristics improving method for high permeability amorphous magnetic alloy
DE2824749A1 (en) * 1978-06-06 1979-12-13 Vacuumschmelze Gmbh INDUCTIVE COMPONENT AND PROCESS FOR ITS MANUFACTURING
JPS5633461A (en) * 1979-08-25 1981-04-03 Tdk Corp Improving method for characteristic of amorphous magnetic alloy thin strip
DE3033258A1 (en) * 1979-09-05 1981-03-19 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka Heat treatment of amorphous alloy films - esp. to remove magnetic dis-accommodation in magnetic recording heads
JPS5831053A (en) * 1981-08-18 1983-02-23 Toshiba Corp Amorphous alloy

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104109822A (en) * 2014-06-05 2014-10-22 同济大学 A Ni-containing cobalt-based amorphous giant magneto-impedance alloy thin strip and a preparing method thereof
CN105112816A (en) * 2015-08-03 2015-12-02 河北工业大学 Preparation method of Si-doped low-Sm-content Sm-Co amorphous matrix magnetic alloy

Also Published As

Publication number Publication date
EP0086485A3 (en) 1985-05-15
JPS58139408A (en) 1983-08-18
EP0086485A2 (en) 1983-08-24
DE3374481D1 (en) 1987-12-17
JPS6328483B2 (en) 1988-06-08

Similar Documents

Publication Publication Date Title
EP0086485B1 (en) Wound iron core
US4268325A (en) Magnetic glassy metal alloy sheets with improved soft magnetic properties
US4150981A (en) Glassy alloys containing cobalt, nickel and iron having near-zero magnetostriction and high saturation induction
US4038073A (en) Near-zero magnetostrictive glassy metal alloys with high saturation induction
GB1580498A (en) Metallic glasses having a combination of high permeability low magnetostriction low ac core loss and high thermal stability
US5211767A (en) Soft magnetic alloy, method for making, and magnetic core
US5358576A (en) Amorphous materials with improved properties
JP3068156B2 (en) Soft magnetic alloy
JP2552274B2 (en) Glassy alloy with perminer characteristics
JPS6362579B2 (en)
JP2894561B2 (en) Soft magnetic alloy
KR950014314B1 (en) Iron-base soft magnetic alloy
EP0084138B1 (en) Near-zero magnetostrictive glassy metal alloys with high magnetic and thermal stability
JP2823203B2 (en) Fe-based soft magnetic alloy
JPH0544165B2 (en)
JPS6332244B2 (en)
JPH0123926B2 (en)
EP0351051B1 (en) Fe-based soft magnetic alloy
US11450479B2 (en) Alloy and method for producing a magnetic core
JP2704157B2 (en) Magnetic parts
JPH06200357A (en) Amorphous alloy
JPH01290746A (en) Soft-magnetic alloy
JPH0323619B2 (en)
JPS62167840A (en) Magnetic material and its manufacture
JPS59147415A (en) Wound core

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): DE NL

17P Request for examination filed

Effective date: 19851030

17Q First examination report despatched

Effective date: 19860630

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE NL

REF Corresponds to:

Ref document number: 3374481

Country of ref document: DE

Date of ref document: 19871217

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19980220

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19980226

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991201