[go: up one dir, main page]

WO1993024259A1 - Ameliorations relatives a la production d'alliages a base de fer a haute teneur en silicium - Google Patents

Ameliorations relatives a la production d'alliages a base de fer a haute teneur en silicium Download PDF

Info

Publication number
WO1993024259A1
WO1993024259A1 PCT/GB1993/001169 GB9301169W WO9324259A1 WO 1993024259 A1 WO1993024259 A1 WO 1993024259A1 GB 9301169 W GB9301169 W GB 9301169W WO 9324259 A1 WO9324259 A1 WO 9324259A1
Authority
WO
WIPO (PCT)
Prior art keywords
product
silicon
high silicon
iron alloys
strip
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.)
Ceased
Application number
PCT/GB1993/001169
Other languages
English (en)
Inventor
Gordon Eadie
Dennis Campbell
Simon Hall
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.)
British Steel PLC
Original Assignee
British Steel PLC
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 British Steel PLC filed Critical British Steel PLC
Publication of WO1993024259A1 publication Critical patent/WO1993024259A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • C23C8/18—Oxidising of ferrous surfaces

Definitions

  • This invention relates to the production of high silicon-iron alloys.
  • Magnetic cores of transformers, motors, generators and similar machines are usually fabricated from magnetically soft alloy strip such as 3% silicon-iron alloy and eddy currents circulate in the cores of these machines when alternating current flows in the windings.
  • the specific resistance of the strip alloy is raised when ever possible by increasing the alloying elements (s) such as silicon with or without aluminium. It is well known that using conventional processing routes, the tolerable combined level of such alloying elements (s) is about 3.25% by weight maximum otherwise the material is too brittle to process, cut up or bend due to excessively large grains formed during cooling for example.
  • a further stratagem employed to limit eddy currents is to build up the machine core from thin sheets (lamination) , both surfaces of which carry an electrical insulation medium which can be paper, paint, varnish, lacquer or even inorganic chemical compounds formed on the strip surfaces during processing and reinforced with further coatings such as cured on phosphoric acid employed to fill voids in the primary chemical compound coating, such voids being potential rust generating sites.
  • an electrical insulation medium which can be paper, paint, varnish, lacquer or even inorganic chemical compounds formed on the strip surfaces during processing and reinforced with further coatings such as cured on phosphoric acid employed to fill voids in the primary chemical compound coating, such voids being potential rust generating sites.
  • Preparation of spray formed electrotechnical steel with high levels of silicon with or without aluminium commences with already decarburised material such as finally processed conventional un-insulated strip scrap to which has been added clean, carbon free ferrosilicon with or without aluminium and the whole r ⁇ melted under vacuum or other conditions where carbon cannot be picked up.
  • the material is subjected to a conventional decarburising treatment to encourage the formation of silicates at the surfaces.
  • these coatings are reinforced by passing the strip sequentially through a phosphoric acid bath and curing the insulation media by heating the strip to a temperature of about 700° C in a non-oxidising atmosphere under tension to achieve thermal flattening as well as the benefits of stress relief annealing.
  • chromium and similar compounds can be added to the phosphoric acid bath before curing if required.
  • the material is produced having a high specific resistance due to relatively very high levels of silicon and/or aluminium, good int ⁇ rla inar electrical resistance due to the formation of silicate and similar compounds on the surfaces of strip prepared by sprayforming, and is capable of maintaining good magnetic properties due to the effective absence of carbon.
  • the present invention provides a method of producing high silicon an iron alloys from a start material having a silicon content (with or without aluminium) of between 3.25% and 6.5% by weight which comprises the steps of forming a melt of the start material, producing a product of the melted material by a spray forming technique, and heating the product to a temperature of the order of 700°C to 900°C in a moist hydrogen atmosphere to produce on the surface of the product a silicate layer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Un procédé de production d'alliages à base de fer et à haute teneur en silicium, à partir d'un matériau de départ dont la teneur en silicium (avec ou sans aluminium), est comprise entre 3,25 % et 6,5 % en poids, consiste à former un bain de fusion du matériau de départ, à obtenir un produit du matériau fondu par une technique de formage par projection, à chauffer le produit à une température de l'orde de 700 °C à 900 °C en une atmosphère humide contenant de l'hydrogène pour former une couche de silicate sur la surface du produit.
PCT/GB1993/001169 1992-06-03 1993-06-02 Ameliorations relatives a la production d'alliages a base de fer a haute teneur en silicium Ceased WO1993024259A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9211722.5 1992-06-03
GB9211722A GB2267715B (en) 1992-06-03 1992-06-03 Improvements in and relating to the production of high silicon-iron alloys

Publications (1)

Publication Number Publication Date
WO1993024259A1 true WO1993024259A1 (fr) 1993-12-09

Family

ID=10716447

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001169 Ceased WO1993024259A1 (fr) 1992-06-03 1993-06-02 Ameliorations relatives a la production d'alliages a base de fer a haute teneur en silicium

Country Status (3)

Country Link
AU (1) AU4340193A (fr)
GB (1) GB2267715B (fr)
WO (1) WO1993024259A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054471A (en) * 1976-06-17 1977-10-18 Allegheny Ludlum Industries, Inc. Processing for cube-on-edge oriented silicon steel
US4115161A (en) * 1977-10-12 1978-09-19 Allegheny Ludlum Industries, Inc. Processing for cube-on-edge oriented silicon steel
FR2428077A1 (fr) * 1978-06-09 1980-01-04 Nippon Steel Corp Procede de production d'une tole d'acier au silicium electrique, a grain oriente
EP0420238A2 (fr) * 1989-09-28 1991-04-03 Nippon Steel Corporation Procédé de fabrication de tôles d'acier au silicium unidirectionnel à densité de flux magnétique élevée
EP0453284A2 (fr) * 1990-04-20 1991-10-23 Nippon Steel Corporation Procédé de fabrication de tôles d'acier électriques à double orientation ayant une densité de flux magnétique élevée

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES346570A1 (es) * 1966-11-04 1969-04-16 United States Steel Corp Procedimiento para la fabricacion de un acero.
AT313339B (de) * 1967-10-09 1974-02-11 Csepeli Femmue Fa Kaltgewalzte elektrotechnische Stahlbänder und -platten mit isotropen magnetischen Eigenschaften und Verfahren zu deren Herstellung
GB1262471A (en) * 1968-05-14 1972-02-02 Nat Res Dev Improvements relating to the fabrication of articles
US4030950A (en) * 1976-06-17 1977-06-21 Allegheny Ludlum Industries, Inc. Process for cube-on-edge oriented boron-bearing silicon steel including normalizing
GB8405982D0 (en) * 1984-03-07 1984-04-11 Singer A R E Making metal strip and slab from spray

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054471A (en) * 1976-06-17 1977-10-18 Allegheny Ludlum Industries, Inc. Processing for cube-on-edge oriented silicon steel
US4115161A (en) * 1977-10-12 1978-09-19 Allegheny Ludlum Industries, Inc. Processing for cube-on-edge oriented silicon steel
FR2428077A1 (fr) * 1978-06-09 1980-01-04 Nippon Steel Corp Procede de production d'une tole d'acier au silicium electrique, a grain oriente
EP0420238A2 (fr) * 1989-09-28 1991-04-03 Nippon Steel Corporation Procédé de fabrication de tôles d'acier au silicium unidirectionnel à densité de flux magnétique élevée
EP0453284A2 (fr) * 1990-04-20 1991-10-23 Nippon Steel Corporation Procédé de fabrication de tôles d'acier électriques à double orientation ayant une densité de flux magnétique élevée

Also Published As

Publication number Publication date
GB9211722D0 (en) 1992-07-15
GB2267715A (en) 1993-12-15
AU4340193A (en) 1993-12-30
GB2267715B (en) 1995-11-01

Similar Documents

Publication Publication Date Title
JP6601646B2 (ja) 無方向性電磁鋼板の製造方法とモータコアの製造方法ならびにモータコア
RU2674181C1 (ru) Лист из нетекстурированной электротехнической стали, способ его изготовления и сердечник двигателя
JP3852227B2 (ja) 無方向性電磁鋼板およびその製造方法
JP3176933B2 (ja) 絶縁被膜の密着性が優秀な無方向性電磁鋼板の製造方法
JP6463458B2 (ja) 方向性電磁鋼板用予備コーティング剤組成物、これを含む方向性電磁鋼板およびその製造方法
JP2017537230A (ja) スズ含有無方向性ケイ素鋼板の製造方法、得られた鋼板および当該鋼板の使用
JP5219434B2 (ja) 永久磁石埋め込み型モータのロータ鉄心用鋼板の製造方法
WO2018117640A1 (fr) Tôle d'acier électrique non orientée et son procédé de production
US11788168B2 (en) Electrical steel strip that can be but doesn't have to be reannealed
EP3392317A1 (fr) Composition de revêtement d'isolation pour tôle d'acier magnétique à grains orientés, procédé de formation de revêtement d'isolation de tôle d'acier magnétique à grains orientés, et tôle d'acier magnétique à grains orientés possédant revêtement d'isolation formé sur celle-ci
WO2013024894A1 (fr) Tôle d'acier magnétique non orientée et son procédé de fabrication ainsi que corps laminé pour noyau de moteur et son procédé de fabrication
JP3726289B2 (ja) 鉄損の低い方向性電磁鋼板
JP3392669B2 (ja) 極めて低い鉄損をもつ一方向性電磁鋼板の製造方法
JP6624393B2 (ja) リサイクル性に優れる無方向性電磁鋼板
CN113227410A (zh) 用于高频电动机应用的、具有改善的极化强度和低磁损耗的电工钢带或钢板
KR100373871B1 (ko) 응력제거소둔후의철손이낮은무방향성전자강판및모터또는트랜스용코어
CN101321883B (zh) 无方向性电磁钢板及其制造方法
WO1993024259A1 (fr) Ameliorations relatives a la production d'alliages a base de fer a haute teneur en silicium
CN111684085A (zh) 能够但非强制再退火的电工带材
EP0253904B1 (fr) Procédé pour produire des tôles d'acier au silicium à grains orientés ayant d'excellentes propriétés magnétiques
JP7568948B2 (ja) 電磁鋼板の製造方法
JP2001279400A (ja) 被膜密着性に優れた無方向性電磁鋼板およびその製造方法
KR20040046399A (ko) 자기특성이 우수한 고규소 무방향성 전기강판 제조방법
JP4306490B2 (ja) 鉄損の低い高強度無方向性電磁鋼板の製造方法
JP7533755B2 (ja) 積層鉄心の製造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR CA CH CZ DE DK ES FI GB HU JP KP KR LK LU MG MN MW NL NO NZ PL PT RO RU SD SE SK UA US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: CA