EP0080521B1 - Amorphe Metall-Legierungen niedriger Magnetostriktion - Google Patents

Amorphe Metall-Legierungen niedriger Magnetostriktion Download PDF

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Publication number
EP0080521B1
EP0080521B1 EP81109913A EP81109913A EP0080521B1 EP 0080521 B1 EP0080521 B1 EP 0080521B1 EP 81109913 A EP81109913 A EP 81109913A EP 81109913 A EP81109913 A EP 81109913A EP 0080521 B1 EP0080521 B1 EP 0080521B1
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EP
European Patent Office
Prior art keywords
magnetostriction
glasses
alloys
amorphous metal
metal alloys
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
EP81109913A
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English (en)
French (fr)
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EP0080521A1 (de
Inventor
Robert Charles O'handley
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.)
Allied Corp
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Allied Corp
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Publication date
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Priority to EP81109913A priority Critical patent/EP0080521B1/de
Priority to DE8181109913T priority patent/DE3175475D1/de
Publication of EP0080521A1 publication Critical patent/EP0080521A1/de
Application granted granted Critical
Publication of EP0080521B1 publication Critical patent/EP0080521B1/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C45/00—Amorphous alloys
    • C22C45/04—Amorphous alloys with nickel or cobalt as the major constituent
    • 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

  • This invention relates to amorphous metal alloys and, more particularly, to cobalt rich amorphous metal alloys that. include certain transition metal and metalloid elements.
  • Metallic glasses generally show resistivities greater than 100 micro ohm cm, whereas crystalline and polycrystalline magnetic metals generally show resistivities below 50 micro ohm cm. Also, because of their randomly disordered structures, metallic glasses are typically isotropic in their physical properties, including their magnetization. Because of these two characteristics, metallic glasses have an initial advantage over conventional magnetic metals. However, metallic glasses do not generally show zero magento- striction. When zero magnetostriction glasses can be found they are generally good soft magnetic metals (R. C. 0'Handley, B. A.
  • the EP-A-00 50 479 discloses in Table 1 some amorphous cobalt rich alloys, these alloys contain necessarily silicon. Other cobalt rich amorphous alloys are shown by EP-A-0021 101, but they contain additionally either manganum and silicon or iron. Alloys containing additionally to cobalt and boron only chromium and/or vanadium are not disclosed by both references.
  • the present invention provides low magnetostriction and zero magnetostriction glassy alloys that are easy to fabricate and thermally stable.
  • the alloys are at least 50 percent glassy and consist essentially of compositions defined by the formula: where T is at least one of Cr and V, B is boron and x ranges from about 0 to 16 atom percent.
  • a special magnetic alloy has the composition CO 66 Cr 8 V 6 B 20 .
  • the amorphous alloys of the invention can be formed by cooling a melt of the composition at a rate of at least about 10 5 °C/sec.
  • a variety of techniques are available, as is now well-known in the art, for fabricating splat-quenched foils and rapid-quenched continuous ribbons, wire, sheet, etc.
  • a particular composition is selected, powders of the requisite elements (or of materials that decompose to form the elements, such as nickel-borides, etc.) in the desired proportions are melted and homogenized, and the molten alloy is rapidly quenched either on a chill surface, such as a rotating cooled cylinder, or in a suitable fluid medium, such as a chilled brine solution.
  • the amorphous alloys may be formed in air. However, superior mechanical properties are achieved by forming these amorphous alloys in a partial vacuum with absolute pressure less than about 5.5 cm of Hg, and preferably about 100 pm to 1 cm of Hg, as disclosed in U.S. Patent No. 4,154,283 to Ray et al.
  • the amorphous metal alloys are at least 50 percent amorphous, and preferably at least 80 percent amorphous, as measured by X-ray diffraction. However, a substantial degree of amorphousness approaching 100 percent amorphous is obtained by forming these amorphous metal alloys in a partial vacuum. Ductility is thereby improved, and such alloys possessing a substantial degree of amorphousness are accordingly preferred.
  • Ribbons of these alloys find use in soft magnetic applications and in applications requiring low magnetostriction, high thermal stability (e.g., stable up to about 100°C) and excellent fabricability.
  • the magnetostriction measurements were made in fields up to 4 KOe with metal foil strain gauges (as reported in more detail by R. C. O'Handley in Solid State Communications, Vol. 22, p. 485, 1977). The accurary of these measurements is considered to be within 10 percent of full strain and their strain sensitivity is on the order of 10- 7 .
  • the trends in Figure 1 reflect the variations of both the saturation moments n B and the Curie temperatures T c of these alloys.
  • p x to be the mass density of the crystalline material X and pg to be that of the glassy material X 80 B 20 , the ratios of the measured quantities ⁇ g / ⁇ x were found to be 0.92 and 0.94 for Co 80 B 20 and Fe 80 B 20 glasses.
  • the densities of C0 70 X 10 B 20 glasses were calculated by linearly combining the densities of C0 80 B 20 and X s0 B 20 ,
  • ⁇ S The temperature dependence of ⁇ S is shown in Figure 4 for selected alloys.
  • the sign of ⁇ s was observed to change in two of the glasses.
  • Such compensation temperatures have not previously been observed in metallic glasses.
  • the vanadium containing glasses either become paramagnetic or they crystallize before any compensation can be realized.
  • Co-rich glass compositions with positive and negative magnetostriction can be added linearly to give zero magnetostriction.
  • Magnetism and Magnetic Materials are best described by assuming the number of nearest neighbor TM pairs to be independent of x. This implies that the nearest- neighbor coordination of cobalt atoms by cobalt atoms does not vary strongly with x.
  • the compositional dependence of magnetostriction in Co-rich glasses is well described at room temperature by: where the first term is the observed two-ion component of magnetostriction (independent of composition x) and the second is the single-ion component of magnetostriction (which varies linearly with the TM concentration).
  • the magnetostriction becomes less negative as metalloid content increases, the change in ⁇ being +0.13x 10 -6 per atom percent more metalloid.

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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)

Claims (2)

1. Magnetische Legierung, die zu wenigstens 50 % glasartig ist, wobei diese Legierung die Formel Co80-xTxB20 hat, worin T wenigstens eines der Elemente Cr und V ist, B Bor ist und x im Bereich von etwa 0 bis 16 Atom-% liegt.
2. Magnetische Legierung mit der Zusammensetzung Co66Cr8V6B20.
EP81109913A 1981-11-26 1981-11-26 Amorphe Metall-Legierungen niedriger Magnetostriktion Expired EP0080521B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP81109913A EP0080521B1 (de) 1981-11-26 1981-11-26 Amorphe Metall-Legierungen niedriger Magnetostriktion
DE8181109913T DE3175475D1 (en) 1981-11-26 1981-11-26 Low magnetostriction amorphous metal alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81109913A EP0080521B1 (de) 1981-11-26 1981-11-26 Amorphe Metall-Legierungen niedriger Magnetostriktion

Related Child Applications (3)

Application Number Title Priority Date Filing Date
EP85101590.9 Division-Into 1985-02-14
EP85101589.1 Division-Into 1985-02-14
EP85101588.3 Division-Into 1985-02-14

Publications (2)

Publication Number Publication Date
EP0080521A1 EP0080521A1 (de) 1983-06-08
EP0080521B1 true EP0080521B1 (de) 1986-10-15

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Family Applications (1)

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EP81109913A Expired EP0080521B1 (de) 1981-11-26 1981-11-26 Amorphe Metall-Legierungen niedriger Magnetostriktion

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EP (1) EP0080521B1 (de)
DE (1) DE3175475D1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439253A (en) * 1982-03-04 1984-03-27 Allied Corporation Cobalt rich manganese containing near-zero magnetostrictive metallic glasses having high saturation induction
EP0429022B1 (de) * 1989-11-17 1994-10-26 Hitachi Metals, Ltd. Magnetlegierung mit ultrakleinen Kristallkörnern und Herstellungsverfahren

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050479A1 (de) * 1980-10-16 1982-04-28 Unitika Ltd. Fäden aus einem amorphen Metall auf Kobaltbasis und Verfahren zu deren Herstellung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056411A (en) * 1976-05-14 1977-11-01 Ho Sou Chen Method of making magnetic devices including amorphous alloys
DE2824749A1 (de) * 1978-06-06 1979-12-13 Vacuumschmelze Gmbh Induktives bauelement und verfahren zu seiner herstellung
DE2924280A1 (de) * 1979-06-15 1981-01-08 Vacuumschmelze Gmbh Amorphe weichmagnetische legierung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050479A1 (de) * 1980-10-16 1982-04-28 Unitika Ltd. Fäden aus einem amorphen Metall auf Kobaltbasis und Verfahren zu deren Herstellung

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Publication number Publication date
EP0080521A1 (de) 1983-06-08
DE3175475D1 (en) 1986-11-20

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