EP1474812A1 - Blindage magnetique basse frequence en alliage magnetique doux - Google Patents
Blindage magnetique basse frequence en alliage magnetique douxInfo
- Publication number
- EP1474812A1 EP1474812A1 EP03722655A EP03722655A EP1474812A1 EP 1474812 A1 EP1474812 A1 EP 1474812A1 EP 03722655 A EP03722655 A EP 03722655A EP 03722655 A EP03722655 A EP 03722655A EP 1474812 A1 EP1474812 A1 EP 1474812A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- magnetic
- permeability
- less
- field
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
-
- 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
- H01F1/14708—Fe-Ni based alloys
Definitions
- the present invention relates to a low frequency magnetic shield made of a soft magnetic alloy, as well as to the use of this alloy for the manufacture of low frequency shields.
- the term “low frequency” designates frequencies between 50 Hz and 3000 Hz.
- the magnetic shields are made of magnetic alloy with high permeability, and in particular, of an alloy of the Fe-Ni80 type, containing about 80% of nickel. They have, in fact, a permeability in continuous field ⁇ c c greater than 100,000, and a permeability in alternating field at 300 Hz, ⁇ 3 oo H z > greater than 10,000. In addition, these alloys have a coercive field Hc less than 20 mOe and an induction at saturation Bs greater than ⁇ OOOGauss. However, these alloys are very expensive because they contain a high nickel content.
- alloys of the Fe-Ni36 type are used, containing approximately 36% of nickel.
- these alloys have a permeability in continuous field ⁇ cc between only 20,000 and 30,000, a permeability in alternating field at 300Hz, M3O O H Z , between 8000 and 9000, a coercive field Hc between 50 and 100 mOe, and a saturation induction Bs close to 13000Gauss.
- the shields obtained are less efficient than the shields made of Fe-Ni80 alloy. It has also been proposed, for example in US Pat. No.
- This alloy has the advantage of having a higher permeability P 3OO H Z than the alloy Fe-Ni36 and of containing chromium, which gives it a certain resistance to corrosion, but, its better permeability cannot be obtained. with very low oxygen contents which makes its manufacture restrictive. In addition, it would desirable to have an economic alloy having an even better magnetic permeability.
- the object of the present invention is to provide an economical soft magnetic alloy, suitable for the manufacture of low frequency magnetic shields, more efficient and less restrictive to manufacture than known alloys.
- the first object of the invention is a magnetic shielding for a frequency field between 50 Hz and 3000 Hz, consisting of a soft magnetic alloy whose composition comprises, in% by weight:
- the silicon content is less than 0.15%, that the manganese content is greater than 0.05%, than the sum of the cobalt and copper is greater than 0.015%.
- the oxygen content can be greater than 0.0050%.
- the alloy according to the invention contains in% by weight:
- One or more elements taken from copper and cobalt the sum of their contents being between 0% and 4%, and, preferably, greater than 0.015%, and better still, greater than 0.5%, and better still , greater than 1%, in order to increase the induction at saturation Bs and to make it possible to obtain a high magnetic permeability when the nickel content is relatively low.
- strips are produced, for example, by hot rolling and then cold rolling.
- the strips are annealed at least 1050 ° C, and preferably above 1100 ° C, preferably also under a reducing atmosphere of hydrogen or a steam mixture and hydrogen.
- cooling to room temperature should preferably be carried out at a slow speed, that is to say requiring more than one hour to reach 200 ° C. in order to optimize the magnetic permeability at 300 Hz.
- the alloys marked 1 to 21 have been produced in accordance with the invention, and the alloys marked 22 to 32 given for comparison.
- the compositions and properties of these alloys are given in Tables 1 and 2, and the magnetic properties of the alloys are given in Tables 3 and 4.
- the magnetic properties were measured on strips 0.6 mm thick for the coercive field Hc, expressed in mOe, and for the permeability in continuous field ⁇ cc which was measured at 0 ° C and 40 ° vs.
- the saturation induction Bs expressed in Gauss, was measured at 40 ° C.
- Permeability magnetic field in alternating field at 30Hz, ⁇ 3ooHz was measured at 40 ° C on 0.4mm thick strips.
- the alloys were produced in a vacuum induction furnace, then cast in the form of ingots hot rolled then cold to obtain strips from which samples were cut which were annealed for 4 hours at 1170 ° C under pure and dry hydrogen. , with rapid cooling when they were intended to measure permeability in direct field and slow cooling when they were intended to measure permeability in alternating field.
- Alloys 1 to 21 all have a coercive field significantly less than 100mOe, a permeability in continuous field greater than 40,000 at both 0 ° C and 40 ° C, a permeability in alternating field at 300Hz greater than 15,000, and an induction saturation greater than 4000G.
- Alloy 22 has too high a chromium content which does not satisfy the conditions Cr + Mo ⁇ 0.8 x Ni + 0.9 x (Co + Cu) - 18.4 and Cr + Mo ⁇ 4 x Ni + 3 x (Co + Cu) - 124, its saturation induction is very low. Alloys 23, 24 and 25 have chromium contents too high to satisfy the condition 4 x (Cr + Mo)> 125 - 3 x Ni, and their permeability in continuous field is significantly less than 40,000.
- Alloy 26 does not satisfy the Cr> 5% relationship, and its permeability in alternating field at 300Hz is significantly less than 15000.
- Alloy 27 has an oxygen content greater than 160 ppm and its permeability in continuous field is significantly less than 40000.
- Alloys 28 and 29 do not meet the condition 4 x (Cr + Mo)> 125 - 3 x Ni and alloy 28 does not meet the condition Cr> 5%. On the one hand their permeabilities in continuous field are appreciably lower than 40000, but especially their permeabilities in alternating field are appreciably lower than 15000. Alloy 30 does not meet the condition Cr + Mo ⁇ 0.8 x Ni + 0.9 x (Co + Cu) - 18.4 and its permeability in continuous field is significantly less than 40,000.
- Alloy 31 does not meet the conditions Cr + Mo ⁇ 4 x Ni + 3 x (Co + Cu) - 124 and 4 x (Cr + Mo)> 125 - 3 x Ni, and its magnetic permeability both in alternating field and 'in continuous field is insufficient.
- Alloy 32 does not satisfy the condition 4 x (Cr + Mo)> 125 - 3 x Ni, and its magnetic permeability is very insufficient.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0201901A FR2836156B1 (fr) | 2002-02-15 | 2002-02-15 | Alliage magnetique doux pour blindage magnetique |
FR0201901 | 2002-02-15 | ||
PCT/FR2003/000491 WO2003069637A1 (fr) | 2002-02-15 | 2003-02-14 | Blindage magnetique basse frequence en alliage magnetique doux |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1474812A1 true EP1474812A1 (fr) | 2004-11-10 |
Family
ID=27636198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03722655A Withdrawn EP1474812A1 (fr) | 2002-02-15 | 2003-02-14 | Blindage magnetique basse frequence en alliage magnetique doux |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060096670A1 (fr) |
EP (1) | EP1474812A1 (fr) |
JP (1) | JP2006510799A (fr) |
AU (1) | AU2003229824A1 (fr) |
FR (1) | FR2836156B1 (fr) |
WO (1) | WO2003069637A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2002221910A1 (en) * | 2001-11-30 | 2003-06-10 | Alinox Ag | Cooking vessel comprising a base made of a multilayer material and a side wall, and article of multilayer material |
FR2833019B1 (fr) * | 2001-11-30 | 2004-09-10 | Imphy Ugine Precision | Alliage ferromagnetique pour la cuisson par induction |
CN107904508B (zh) * | 2017-11-16 | 2019-09-17 | 南京信息工程大学 | 一种合金带材料及其制备方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2775536A (en) * | 1952-07-19 | 1956-12-25 | Bell Telephone Labor Inc | Bodies having low temperature coefficients of elasticity |
JP2711574B2 (ja) * | 1989-09-04 | 1998-02-10 | 日新製鋼株式会社 | 磁気シールド部材用Ni―Fe―Cr軟質磁性合金 |
JP2646277B2 (ja) * | 1990-03-27 | 1997-08-27 | 日新製鋼株式会社 | 鉄心部材用Ni―Fe―Cr軟質磁性合金 |
US5211771A (en) * | 1991-03-13 | 1993-05-18 | Nisshin Steel Company, Ltd. | Soft magnetic alloy material |
JPH06169537A (ja) * | 1992-11-27 | 1994-06-14 | Citizen Watch Co Ltd | 電子時計用モータのステータ |
JPH0762483A (ja) * | 1993-08-30 | 1995-03-07 | Nisshin Steel Co Ltd | 軟磁性合金の溶製方法 |
JPH08203718A (ja) * | 1994-10-04 | 1996-08-09 | Nisshin Steel Co Ltd | 絶縁皮膜を有する軟質磁性材料及びその製造方法 |
FR2753017B1 (fr) * | 1996-08-29 | 1998-10-16 | Imphy Sa | Moteur pas a pas pour horlogerie dont le stator est constitue d'un alliage magnetique doux et alliage magnetique doux |
JP2000008148A (ja) * | 1998-06-19 | 2000-01-11 | Daido Steel Co Ltd | 高耐食軟磁性焼結体及びその粉末 |
FR2791704B1 (fr) * | 1999-04-02 | 2001-05-25 | Imphy Ugine Precision | Alliage magnetique doux pour horlogerie |
WO2000063454A1 (fr) * | 1999-04-15 | 2000-10-26 | Vacuumschmelze Gmbh | Alliage fer-nickel anti-corrosion pour disjoncteurs de courant de fuite et pieces de mouvements d'horlogerie |
EP1126041A4 (fr) * | 1999-08-11 | 2009-06-03 | Jfe Steel Corp | Feuille d'acier de protection contre les perturbations magnetiques et son procede de fabrication |
-
2002
- 2002-02-15 FR FR0201901A patent/FR2836156B1/fr not_active Expired - Fee Related
-
2003
- 2003-02-14 JP JP2003568672A patent/JP2006510799A/ja not_active Withdrawn
- 2003-02-14 US US10/504,698 patent/US20060096670A1/en not_active Abandoned
- 2003-02-14 WO PCT/FR2003/000491 patent/WO2003069637A1/fr not_active Application Discontinuation
- 2003-02-14 EP EP03722655A patent/EP1474812A1/fr not_active Withdrawn
- 2003-02-14 AU AU2003229824A patent/AU2003229824A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO03069637A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2006510799A (ja) | 2006-03-30 |
FR2836156B1 (fr) | 2005-01-07 |
WO2003069637A1 (fr) | 2003-08-21 |
FR2836156A1 (fr) | 2003-08-22 |
US20060096670A1 (en) | 2006-05-11 |
AU2003229824A1 (en) | 2003-09-04 |
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