CA1200407A - Magnetic devices using amorphous alloys - Google Patents
Magnetic devices using amorphous alloysInfo
- Publication number
- CA1200407A CA1200407A CA000240276A CA240276A CA1200407A CA 1200407 A CA1200407 A CA 1200407A CA 000240276 A CA000240276 A CA 000240276A CA 240276 A CA240276 A CA 240276A CA 1200407 A CA1200407 A CA 1200407A
- Authority
- CA
- Canada
- Prior art keywords
- metal alloys
- amorphous
- elements
- cores
- magnetic devices
- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/008—Amorphous alloys with Fe, Co or Ni as the major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/003—Making ferrous alloys making amorphous alloys
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
INVENTION: MAGNETIC DEVICES USING AMORPHOUS ALLOYS
INVENTOR: GERALD R. BRETTS
ABSTRACT OF THE DISCLOSURE
Magnetic devices are disclosed which utilize amorphous metal alloys as cores. Compared with polycrystalline metal alloys, amorphous metal alloys evidence a lower coercive force, a higher permeability and a higher electrical resistivity. As a consequence of this combination of properties, together with the relative insensitivity of the amorphous structure to slight amounts of cold work, the amorphous metal alloys are useful as the magnetic cores of various forms of inductive devices where a low total core loss is a significant factor. The metal alloys have the formula (FE)70-85T0-15x15-25 where FE is at least one of the elements of iron, cobalt and nickel, T is at least one of the transition metal elements and X is at least one of the metalloid elements of aluminum, antimony, beryllium, boron, germanium carbon, indium; phosphorus, silicon and tin. Preferably, X is at least one of the elements of phosphorus, boron, carbon, silicon and aluminum. Used as cores of magnetic devices, these amorphous metal alloys evidence generally superior properties, as compared with well-known polycrystalline metal alloys utilized in the prior art.
INVENTOR: GERALD R. BRETTS
ABSTRACT OF THE DISCLOSURE
Magnetic devices are disclosed which utilize amorphous metal alloys as cores. Compared with polycrystalline metal alloys, amorphous metal alloys evidence a lower coercive force, a higher permeability and a higher electrical resistivity. As a consequence of this combination of properties, together with the relative insensitivity of the amorphous structure to slight amounts of cold work, the amorphous metal alloys are useful as the magnetic cores of various forms of inductive devices where a low total core loss is a significant factor. The metal alloys have the formula (FE)70-85T0-15x15-25 where FE is at least one of the elements of iron, cobalt and nickel, T is at least one of the transition metal elements and X is at least one of the metalloid elements of aluminum, antimony, beryllium, boron, germanium carbon, indium; phosphorus, silicon and tin. Preferably, X is at least one of the elements of phosphorus, boron, carbon, silicon and aluminum. Used as cores of magnetic devices, these amorphous metal alloys evidence generally superior properties, as compared with well-known polycrystalline metal alloys utilized in the prior art.
Description
MA _ETIC DEVICE5 Background of the Invention I. Field of the Invention The invention is concerned with magnetic devices, and more particularly, with magnetic devices utilizing amorphous metal alloys as cores.
2. Description of the_Prior Art Magnetic devices, such as transformers, motors, genera-tors and the like, include cores which are composed of magnetically soft material.
Outstanding characteristics required of magnetically soft materials are: (a) low hysteresis 105s resulting from inter-nal friction during a magnetic cycle; (b) low eddy current loss from electric currents induced by changes in flux; (c) low coer-cive force; (d~ high magnetic permeability and, in some cases, constant permeability at low field strengths; (e) high saturation value; and (f~ minimum or definite change in permeability with temperature in special applications. Cost, availability and ease of processin~ are other factors that influence the final choice of material.
Investigations have revealed a number of metal alloys suitable for use as cores in magnetic devices. These include high purity iron, silicon steels, iron-nicke] alloys, iron-cobalt alloys, and ferrites. Nevertheless, new compositions are continually sought in which the foregoing properties are improved.
Summary of the Invention In accordance with the invention, magnetic devices utilize amorphous magnetic metal alloys as cores. The metal alloys are at least 50% amorphous, as determined by X-ray diffraction, and preferably at least 80% amorphous, and more preferably, at least 95% amorphous. The metal alloys have the formula ~k ~ FE)7o-gsTo-lsxl5-25~
where FE is at least one of the elements of iron, cobalt and nickel, T is at least one of the transition metal elements and X is at least one of the metalloid elements of aluminum, antimony~ beryl-lium, boron, germanium, carbon, indium, phosphorus, silicon and tin. Preferably, X is at least one of the elements of phosphorus, boron, carbon, silicon and aluminum. Used as cores of magnetic devices, these amorphous metal alloys evidence generally superior properties, as compared with well-known polycrystalline metal alloys utilized in the prior artO
Detailed Description of the Invention A theory has not yet been developed to correlate many macroscopic physical properties of polycrystalline metal alloys and of amorphous metal alloys having substantially the same com-position. Many of the physical properties of previously disclosed amorphous metal alloys tend to change at elevated temperatures.
In contrast to this, however, a class of amorphous metal alloys, whose compositions are given below, exhibit the very low coercive force, high permeability, high electrical resistivity and other desirable properties required for use in magnetic devices.
~ morphous metal alloys used in the invention may he represented by the following formula (the subscripts are in atom percent):
(FE)70-8~o-lsxl5-25 where FE is at least one iron group element, T is at least one transition metal element and X is at least one of the metalloid elements of aluminum, antimony, beryllium, boron, germanium, carbon, indium, phosphorus, silicon and tin. Iron group elements .
are iron, cobalt and nickel. As used herein, the term "transi-tion metal elements" i8 intended to include those elements listed in Groups IB to VIIB and VIII of the Periodic Table. Preferably, X is at least one of the elements of phosphorus, '~,,.
~2a~
boron and carbon, with minor additions (up to about 5 atom percent) of aluminum and silicon. Typical compositions include Feg0pl6Bl~
A13, Fe40Ni40Pl~B6, Fe2gNi4gPl~B6Si2~ Fe2sNi25co2ocrloB2o~ Fe55Ni8-Co5Crl5B17~ Fe82.6Pl6AllgO.4~ Fe82.6P16Sil.sB0.4~ and Fe30Ni45-6 Cr5PlgBo.4. The purity of all elements described is that ound in normal commercial practice.
Preferred compositions depend on the specific application desired. For high saturation value greater than about 15 kilogauss, it is desired that a relatively high amount of cobalt and/or iron be present. Accordingly, such a composition may be represented by the formula (co~F~e)7o-8sTo-l5xl5-25 where T and X are defined as above. For low coercive force less than about 0.05 oersteds, the preferred composition may be represented by the formula (Ni,Fe)70-8sTo-lsxl5-25 where T and X are given as above and where the ratio of nickel to iron ranges from about 5:3 to 1:1.
The amorphous metal alloys are formed by cooling a melt 20 at a rate of about 105 to 106C/sec. These amorphous metal alloys are usually at least 50% amorphous when processed in this manner, as determined by X-ray diffraction and may be utilized in some applications. It is preferred, however, that the amorphous alloys be at least 80% amorphous, and more preferably, at least 95% amor-phous to realize maximal performance in magnetic devices.
A variety of well-known techniques are available for fabricating splat-quenched foils and rapid-quenched continuous ribbon, wire, sheet, etc. Typically, when used in cores for magnetic device applications, these alloys conveniently take the form of wire or ribbon. The wire and ribbon are convenien-tly prepared by casting molten material directly onto a chill surface or into a quenching medium of some sort. Such processing tech-niques considerably reduce the cost of fabrication, since no intermediate wire-drawing or ribbon-forming procedures are required.
These amorphous metal alloys evidence high tensile strength, typically about 200,000 to 600,000 psi, depending on the particular composition. This is to be compared with poly-crystalline alloys, which are used in the annealed condition and which usually range from about 40,000 to 80,000 psi. A high tensile strength is an important consideration in applications where high centrifugal forces are present, such as experienced by cores in motors and generators, since higher strength alloys allow higher rotational speeds.
All of the amorphous metal alloys evidence a high elec-trical resistivity, ranging from about 160 to 180 microhm-cm at 25C, depending on the particular composition. Typical prior art materials have resistivities of about 45 to 160 microhm-cm. A high resistivity is useful in AC applications for minimizing eddy current losses, which, in turn, are a factor in reducing core loss.
The fabricability and ductility of the amorphous metal alloys are good. In the prior art, mechanical treatment, such as punching and stamping, tends to degrade magnetic properties.
This degradation must be overcome with additional thermal treatment.
In amorphous metal alloys used in accordance with the invention, the magnetic properties do not change and in fact, slightly improve in many cases through such treatment.
A further unexpected characteristic of the amorphous metal alloys is that lower coercive forces are obtained than with prior art compositions of substantially the same metallic content, thereby permitting more iron, which is relatively inexpensive, to be utilized, as compared with a greater proportion of nickel, which is more expensive.
Depending on the particular application desired, the amorphous metal alloys are useful as cores for magnetic devices such as transformers, motors, generators and the like.
Examples Magnetic measurements were made on several amorphous metal alloy specimens as indicated below. Ribbons were wound into multiple layer rings of diameter from about 1 to 2 cm, similar to tape wound cores for small and miniature transformers.
To measure the magnetic induction of the ring sample, primary and secondary windin~s of enameled or polytetrafluoroethylene coated copper wire were applied. Ma~netizing current was provided by a bipolar operational amplifier controlled manually or driven by a variable fre~uency signal generator. The output from the secondary coil was integrated and displayed against field on an X-Y recorder or on an oscillocope. In this manner, the satura-tion magnetiz~tion, the remanence, the ratio of remanence to magnetic induction, the coercive force and the maximum permea-bility were determined in DC fields.
The results for three samples of amorphous metal alloys are tabulated in the Table below. Sample 1 had a composition of FegoP16BlA13 (the subscripts are in atom percent)~ Measurements were made on ribbon of Sample 1 having dimensions 0.065 inch wide by 0.0014 inch thick. Sample 2 had a composition Fe40Ni40P14B6.
Measurements were made on ribbon of Sample 2 having dimensions 0.063 inch wide by 0.0013 inch thick. Sample 3 had a composition Fe2gNi49Pl4B6si2 Measurements were made on D-wire of Sample 3, which in cross-section is half an ellipse, having dimensions as follows: the major axis was Q.024 inch and one-half the minor 30 axis was 0.0028 inch.
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For comparison, strips of a polycrystalline alloy having the composition 50 Ni - 50 Fe had a saturation magnetization of 15.5 kilogauss, a remanence of from 12 to 15 kilogauss, a ratio of remanence to lnduction of 0.85 ~o 0.95, a coersive force of 0.08 oersteds, and a maximum permeability of 100 x 103. Strips of another polycrystalline alloy having the composition 80 Ni -15 Fe - 5 Mo had a saturation magnetization of 8 kilogauss, a remanence of 4 to 6.5 kilogauss, a ratio of remanence to induction of 0.5-0.9, a coersive force of 0.03 oersteds, and a maximum permeability of 200 x 103.
Outstanding characteristics required of magnetically soft materials are: (a) low hysteresis 105s resulting from inter-nal friction during a magnetic cycle; (b) low eddy current loss from electric currents induced by changes in flux; (c) low coer-cive force; (d~ high magnetic permeability and, in some cases, constant permeability at low field strengths; (e) high saturation value; and (f~ minimum or definite change in permeability with temperature in special applications. Cost, availability and ease of processin~ are other factors that influence the final choice of material.
Investigations have revealed a number of metal alloys suitable for use as cores in magnetic devices. These include high purity iron, silicon steels, iron-nicke] alloys, iron-cobalt alloys, and ferrites. Nevertheless, new compositions are continually sought in which the foregoing properties are improved.
Summary of the Invention In accordance with the invention, magnetic devices utilize amorphous magnetic metal alloys as cores. The metal alloys are at least 50% amorphous, as determined by X-ray diffraction, and preferably at least 80% amorphous, and more preferably, at least 95% amorphous. The metal alloys have the formula ~k ~ FE)7o-gsTo-lsxl5-25~
where FE is at least one of the elements of iron, cobalt and nickel, T is at least one of the transition metal elements and X is at least one of the metalloid elements of aluminum, antimony~ beryl-lium, boron, germanium, carbon, indium, phosphorus, silicon and tin. Preferably, X is at least one of the elements of phosphorus, boron, carbon, silicon and aluminum. Used as cores of magnetic devices, these amorphous metal alloys evidence generally superior properties, as compared with well-known polycrystalline metal alloys utilized in the prior artO
Detailed Description of the Invention A theory has not yet been developed to correlate many macroscopic physical properties of polycrystalline metal alloys and of amorphous metal alloys having substantially the same com-position. Many of the physical properties of previously disclosed amorphous metal alloys tend to change at elevated temperatures.
In contrast to this, however, a class of amorphous metal alloys, whose compositions are given below, exhibit the very low coercive force, high permeability, high electrical resistivity and other desirable properties required for use in magnetic devices.
~ morphous metal alloys used in the invention may he represented by the following formula (the subscripts are in atom percent):
(FE)70-8~o-lsxl5-25 where FE is at least one iron group element, T is at least one transition metal element and X is at least one of the metalloid elements of aluminum, antimony, beryllium, boron, germanium, carbon, indium, phosphorus, silicon and tin. Iron group elements .
are iron, cobalt and nickel. As used herein, the term "transi-tion metal elements" i8 intended to include those elements listed in Groups IB to VIIB and VIII of the Periodic Table. Preferably, X is at least one of the elements of phosphorus, '~,,.
~2a~
boron and carbon, with minor additions (up to about 5 atom percent) of aluminum and silicon. Typical compositions include Feg0pl6Bl~
A13, Fe40Ni40Pl~B6, Fe2gNi4gPl~B6Si2~ Fe2sNi25co2ocrloB2o~ Fe55Ni8-Co5Crl5B17~ Fe82.6Pl6AllgO.4~ Fe82.6P16Sil.sB0.4~ and Fe30Ni45-6 Cr5PlgBo.4. The purity of all elements described is that ound in normal commercial practice.
Preferred compositions depend on the specific application desired. For high saturation value greater than about 15 kilogauss, it is desired that a relatively high amount of cobalt and/or iron be present. Accordingly, such a composition may be represented by the formula (co~F~e)7o-8sTo-l5xl5-25 where T and X are defined as above. For low coercive force less than about 0.05 oersteds, the preferred composition may be represented by the formula (Ni,Fe)70-8sTo-lsxl5-25 where T and X are given as above and where the ratio of nickel to iron ranges from about 5:3 to 1:1.
The amorphous metal alloys are formed by cooling a melt 20 at a rate of about 105 to 106C/sec. These amorphous metal alloys are usually at least 50% amorphous when processed in this manner, as determined by X-ray diffraction and may be utilized in some applications. It is preferred, however, that the amorphous alloys be at least 80% amorphous, and more preferably, at least 95% amor-phous to realize maximal performance in magnetic devices.
A variety of well-known techniques are available for fabricating splat-quenched foils and rapid-quenched continuous ribbon, wire, sheet, etc. Typically, when used in cores for magnetic device applications, these alloys conveniently take the form of wire or ribbon. The wire and ribbon are convenien-tly prepared by casting molten material directly onto a chill surface or into a quenching medium of some sort. Such processing tech-niques considerably reduce the cost of fabrication, since no intermediate wire-drawing or ribbon-forming procedures are required.
These amorphous metal alloys evidence high tensile strength, typically about 200,000 to 600,000 psi, depending on the particular composition. This is to be compared with poly-crystalline alloys, which are used in the annealed condition and which usually range from about 40,000 to 80,000 psi. A high tensile strength is an important consideration in applications where high centrifugal forces are present, such as experienced by cores in motors and generators, since higher strength alloys allow higher rotational speeds.
All of the amorphous metal alloys evidence a high elec-trical resistivity, ranging from about 160 to 180 microhm-cm at 25C, depending on the particular composition. Typical prior art materials have resistivities of about 45 to 160 microhm-cm. A high resistivity is useful in AC applications for minimizing eddy current losses, which, in turn, are a factor in reducing core loss.
The fabricability and ductility of the amorphous metal alloys are good. In the prior art, mechanical treatment, such as punching and stamping, tends to degrade magnetic properties.
This degradation must be overcome with additional thermal treatment.
In amorphous metal alloys used in accordance with the invention, the magnetic properties do not change and in fact, slightly improve in many cases through such treatment.
A further unexpected characteristic of the amorphous metal alloys is that lower coercive forces are obtained than with prior art compositions of substantially the same metallic content, thereby permitting more iron, which is relatively inexpensive, to be utilized, as compared with a greater proportion of nickel, which is more expensive.
Depending on the particular application desired, the amorphous metal alloys are useful as cores for magnetic devices such as transformers, motors, generators and the like.
Examples Magnetic measurements were made on several amorphous metal alloy specimens as indicated below. Ribbons were wound into multiple layer rings of diameter from about 1 to 2 cm, similar to tape wound cores for small and miniature transformers.
To measure the magnetic induction of the ring sample, primary and secondary windin~s of enameled or polytetrafluoroethylene coated copper wire were applied. Ma~netizing current was provided by a bipolar operational amplifier controlled manually or driven by a variable fre~uency signal generator. The output from the secondary coil was integrated and displayed against field on an X-Y recorder or on an oscillocope. In this manner, the satura-tion magnetiz~tion, the remanence, the ratio of remanence to magnetic induction, the coercive force and the maximum permea-bility were determined in DC fields.
The results for three samples of amorphous metal alloys are tabulated in the Table below. Sample 1 had a composition of FegoP16BlA13 (the subscripts are in atom percent)~ Measurements were made on ribbon of Sample 1 having dimensions 0.065 inch wide by 0.0014 inch thick. Sample 2 had a composition Fe40Ni40P14B6.
Measurements were made on ribbon of Sample 2 having dimensions 0.063 inch wide by 0.0013 inch thick. Sample 3 had a composition Fe2gNi49Pl4B6si2 Measurements were made on D-wire of Sample 3, which in cross-section is half an ellipse, having dimensions as follows: the major axis was Q.024 inch and one-half the minor 30 axis was 0.0028 inch.
~ ~ ~~y7 ~l o o o r~ r~
~r~
~ ~ x a) ~ o ~
~ r~~0 o ~ u~
r~
a~ ~D r~r~
:\
a ~ ~ oo o ~ a (D O
o r~ ~
o o ~ ~
~ o r~
h t~ a) ~
o o ~ t~ r~
~ ~ ~ ~ co ~ r~ .
h 1~ O 1~ o o o O ~ O
4~ .r~ o !~1 ,~ a~ ~ ~
;l h ~ a m ~ a ~ ~ r~
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a) ~ ~ ~ Ln ,~ ~ a) ~ o ~ co .
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S~
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,~
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~2~
For comparison, strips of a polycrystalline alloy having the composition 50 Ni - 50 Fe had a saturation magnetization of 15.5 kilogauss, a remanence of from 12 to 15 kilogauss, a ratio of remanence to lnduction of 0.85 ~o 0.95, a coersive force of 0.08 oersteds, and a maximum permeability of 100 x 103. Strips of another polycrystalline alloy having the composition 80 Ni -15 Fe - 5 Mo had a saturation magnetization of 8 kilogauss, a remanence of 4 to 6.5 kilogauss, a ratio of remanence to induction of 0.5-0.9, a coersive force of 0.03 oersteds, and a maximum permeability of 200 x 103.
Claims (3)
1. A magnetic device including a core composed of an amorphous magnetic metal alloy having the formula (Ni,Fe)70-85T0-15x15-25 wherein T is at least one transition metal element and X
is at least one of the metalloid elements of aluminum, antimony, beryllium, boron, germanium, carbon, indium, phosphorous, silicon and tin, and wherein the ratio of nickel to iron ranges from about 5:3 to 1:1.
is at least one of the metalloid elements of aluminum, antimony, beryllium, boron, germanium, carbon, indium, phosphorous, silicon and tin, and wherein the ratio of nickel to iron ranges from about 5:3 to 1:1.
2. A magnetic device as recited in claims 1 and 2, wherein said alloy is at least about 80 percent amorphous.
3. A magnetic device as recited in claims 1 and 2, wherein said alloy is at least about 95 percent amorphous.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US52818274A | 1974-11-29 | 1974-11-29 | |
| US528,182 | 1983-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200407A true CA1200407A (en) | 1986-02-11 |
Family
ID=24104578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000240276A Expired CA1200407A (en) | 1974-11-29 | 1975-11-24 | Magnetic devices using amorphous alloys |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS6130404B2 (en) |
| CA (1) | CA1200407A (en) |
| DE (1) | DE2553003C2 (en) |
| FR (1) | FR2293043A1 (en) |
| GB (1) | GB1525276A (en) |
| HK (1) | HK3681A (en) |
| NL (1) | NL182182C (en) |
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| JPS6035425B2 (en) * | 1976-11-11 | 1985-08-14 | 株式会社東芝 | Manufacturing method of high magnetic permeability amorphous alloy |
| NL176090C (en) | 1977-02-26 | 1985-02-18 | Vacuumschmelze Gmbh | METHOD FOR REDUCING THE MAGNETICIZATION LOSSES IN THIN-WEEK-MAGNETIC AMORPHIC METAL ALLOYS. |
| FR2561263B1 (en) * | 1977-09-12 | 1988-03-25 | Sony Corp | AMORPHOUS MAGNETIC ALLOY |
| JPS5949299B2 (en) * | 1977-09-12 | 1984-12-01 | ソニー株式会社 | amorphous magnetic alloy |
| DE2824749A1 (en) * | 1978-06-06 | 1979-12-13 | Vacuumschmelze Gmbh | INDUCTIVE COMPONENT AND PROCESS FOR ITS MANUFACTURING |
| DE2832731A1 (en) * | 1978-07-26 | 1980-02-07 | Vacuumschmelze Gmbh | MAGNETIC CORE MADE OF A SOFT MAGNETIC AMORPHOUS ALLOY |
| GB2038358B (en) * | 1978-11-29 | 1982-12-08 | Gen Electric | Amorphous fe-b-si alloys |
| US4259109A (en) * | 1979-05-03 | 1981-03-31 | Allied Chemical Corporation | Beryllium-containing iron-boron glassy magnetic alloys |
| US4219355A (en) * | 1979-05-25 | 1980-08-26 | Allied Chemical Corporation | Iron-metalloid amorphous alloys for electromagnetic devices |
| DE2924280A1 (en) * | 1979-06-15 | 1981-01-08 | Vacuumschmelze Gmbh | AMORPHE SOFT MAGNETIC ALLOY |
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| JPS6020882B2 (en) * | 1980-02-01 | 1985-05-24 | 東北大学金属材料研究所長 | Manufacturing method of magnetic head using high magnetic permeability amorphous alloy |
| GB2075786B (en) * | 1980-03-21 | 1984-07-11 | Electrotech Instr Ltd | Switch mode converters |
| JPS5841649B2 (en) | 1980-04-30 | 1983-09-13 | 株式会社東芝 | wound iron core |
| JPS5754251A (en) * | 1980-09-15 | 1982-03-31 | Tdk Corp | Amorphous magnetic alloy material |
| JPS57149442A (en) * | 1981-03-07 | 1982-09-16 | Res Inst Electric Magnetic Alloys | Amorphous alloy having high saturated magnetic flux density and high permeability and preparation thereof |
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| EP0161393A1 (en) * | 1981-11-26 | 1985-11-21 | Allied Corporation | Low magnetostriction amorphous metal alloys |
| EP0160166A1 (en) * | 1981-11-26 | 1985-11-06 | Allied Corporation | Low magnetostriction amorphous metal alloys |
| EP0161394A1 (en) * | 1981-11-26 | 1985-11-21 | Allied Corporation | Low magnetostriction amorphous metal alloys |
| JPS5893585A (en) * | 1981-11-27 | 1983-06-03 | Hitachi Ltd | Member having excellent high temperature corrosion resistance |
| DE3275492D1 (en) * | 1982-01-18 | 1987-04-02 | Allied Corp | Near-zero magnetostrictive glassy metal alloys with high magnetic and thermal stability |
| EP0134792A1 (en) * | 1983-01-24 | 1985-03-27 | Western Electric Company, Incorporated | Magneto-electric pulse generating device |
| JPS6074104A (en) * | 1983-09-29 | 1985-04-26 | Alps Electric Co Ltd | Digital magnetic head |
| JPS63186560A (en) * | 1987-05-15 | 1988-08-02 | Toshiba Corp | Voltage resonance type high frequency switching circuit |
| JP3710226B2 (en) * | 1996-03-25 | 2005-10-26 | 明久 井上 | Quench ribbon made of Fe-based soft magnetic metallic glass alloy |
| EP0998009B1 (en) * | 1998-01-22 | 2008-09-24 | Seiko Epson Corporation | Electronic timepiece with a generator |
| US6803693B2 (en) * | 2002-04-11 | 2004-10-12 | General Electric Company | Stator core containing iron-aluminum alloy laminations and method of using |
| JP4849545B2 (en) | 2006-02-02 | 2012-01-11 | Ｎｅｃトーキン株式会社 | Amorphous soft magnetic alloy, amorphous soft magnetic alloy member, amorphous soft magnetic alloy ribbon, amorphous soft magnetic alloy powder, and magnetic core and inductance component using the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3838365A (en) * | 1973-02-05 | 1974-09-24 | Allied Chem | Acoustic devices using amorphous metal alloys |
| SE7511398L (en) * | 1974-10-21 | 1976-04-22 | Western Electric Co | MAGNETIC DEVICE |
-
1975
- 1975-11-20 NL NL7513556A patent/NL182182C/en not_active IP Right Cessation
- 1975-11-24 CA CA000240276A patent/CA1200407A/en not_active Expired
- 1975-11-26 DE DE19752553003 patent/DE2553003C2/en not_active Expired
- 1975-11-27 GB GB4883875A patent/GB1525276A/en not_active Expired
- 1975-11-27 JP JP50141810A patent/JPS6130404B2/ja not_active Expired
- 1975-11-28 FR FR7536571A patent/FR2293043A1/en not_active Withdrawn
-
1981
- 1981-01-29 HK HK3681A patent/HK3681A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5177899A (en) | 1976-07-06 |
| DE2553003A1 (en) | 1976-08-12 |
| NL182182C (en) | 1988-01-18 |
| GB1525276A (en) | 1978-09-20 |
| JPS6130404B2 (en) | 1986-07-14 |
| NL182182B (en) | 1987-08-17 |
| DE2553003C2 (en) | 1985-02-28 |
| FR2293043A1 (en) | 1976-06-25 |
| HK3681A (en) | 1981-02-04 |
| NL7513556A (en) | 1976-06-01 |
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