CA2024226A1 - Magnesium oxide coating for electrical steels and a method of coating - Google Patents

Magnesium oxide coating for electrical steels and a method of coating

Info

Publication number
CA2024226A1
CA2024226A1 CA2024226A CA2024226A CA2024226A1 CA 2024226 A1 CA2024226 A1 CA 2024226A1 CA 2024226 A CA2024226 A CA 2024226A CA 2024226 A CA2024226 A CA 2024226A CA 2024226 A1 CA2024226 A1 CA 2024226A1
Authority
CA
Canada
Prior art keywords
magnesia
coating
anneal
glass film
annealing separator
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.)
Granted
Application number
CA2024226A
Other languages
French (fr)
Other versions
CA2024226C (en
Inventor
Wade S. Wright
Robin A. Murphy
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.)
Armco Inc
Original Assignee
Armco Inc
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 Armco Inc filed Critical Armco Inc
Publication of CA2024226A1 publication Critical patent/CA2024226A1/en
Application granted granted Critical
Publication of CA2024226C publication Critical patent/CA2024226C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

Decarburized grain oriented silicon steel is provided with an annealing separator which forms a glass film after the final high temperature anneal.
The magnesia used as the annealing separator has a total chlorine level of 0.01 to 0.20% by weight based on the weight of magnesia with at least 0.01 % metal chloride selected from the group of Mg, Ca, Na and K. The chloride addition acts to seal the coating surface during the final anneal to control diffusion and stabilize the secondary grain growth. The glass film which forms during the anneal may be laser scribed for domain refinement without coating damage. The magnesia may also contain additions of phosphates, TiO2, SiO2, Cr and B. The temperature of the magnesia is maintained below 25°C to control hydration and eliminate the need for other additives in the magnesia slurry to control hydration.
CA002024226A 1989-09-08 1990-08-29 Magnesium oxide coating for electrical steels and a method of coating Expired - Fee Related CA2024226C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40471489A 1989-09-08 1989-09-08
US07/404,714 1989-09-08

Publications (2)

Publication Number Publication Date
CA2024226A1 true CA2024226A1 (en) 1991-03-09
CA2024226C CA2024226C (en) 2000-02-15

Family

ID=23600734

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002024226A Expired - Fee Related CA2024226C (en) 1989-09-08 1990-08-29 Magnesium oxide coating for electrical steels and a method of coating

Country Status (6)

Country Link
EP (1) EP0416420B1 (en)
JP (1) JP2686455B2 (en)
KR (1) KR0173781B1 (en)
BR (1) BR9004444A (en)
CA (1) CA2024226C (en)
DE (1) DE69015060T2 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2690841B2 (en) * 1992-09-18 1997-12-17 新日本製鐵株式会社 Annealing Separator for grain oriented electrical steel sheet for obtaining uniform high-strength glass coating and excellent magnetic properties
DE4409691A1 (en) * 1994-03-22 1995-09-28 Ebg Elektromagnet Werkstoffe Process for the production of electrical sheets with a glass coating
JP3475258B2 (en) * 1994-05-23 2003-12-08 株式会社海水化学研究所 Ceramic film forming agent and method for producing the same
US5840131A (en) * 1994-11-16 1998-11-24 Nippon Steel Corporation Process for producing grain-oriented electrical steel sheet having excellent glass film and magnetic properties
KR100245032B1 (en) * 1994-11-16 2000-03-02 아사무라 타카싯 Process for producing directional sheet excellent in glass coating and magnetic properties
DE19750066C1 (en) * 1997-11-12 1999-08-05 Ebg Elektromagnet Werkstoffe Process for coating electrical steel strips with an annealing separator
KR19990042456A (en) * 1997-11-26 1999-06-15 성재갑 Aerosol composition of hair treatment lotion and valve for injecting same
KR100435477B1 (en) * 1999-12-27 2004-06-10 주식회사 포스코 A method for manufacturing grain-oriented electrical steel sheet having no surface defects and superior punching property
DE102008039326A1 (en) 2008-08-22 2010-02-25 IWT Stiftung Institut für Werkstofftechnik Preparing electrically insulated electric sheet, to prepare laminated magnetic core, comprises coating one side of sheet using liquid mixture comprising hydrolyzed and condensed metal organic monomer, and heat treating coated sheet
CN102453793B (en) * 2010-10-25 2013-09-25 宝山钢铁股份有限公司 Annealing isolation agent used for preparing mirror surface-oriented silicon steel with excellent magnetic property
EP2814989A1 (en) 2012-02-13 2014-12-24 Solaronics S.A. Cooling of coated sheet metal strip
CA3152615A1 (en) * 2019-10-31 2021-05-06 Makoto Watanabe Grain-oriented electrical steel sheet and method for producing same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5231296B2 (en) * 1973-06-07 1977-08-13
US3841925A (en) * 1973-09-12 1974-10-15 Morton Norwich Products Inc Magnesium oxide steel coating composition and process
US4032366A (en) * 1975-05-23 1977-06-28 Allegheny Ludlum Industries, Inc. Grain-oriented silicon steel and processing therefor
BR7804962A (en) * 1977-08-04 1979-05-08 Armco Inc PROCESS TO STABILIZE VISCOSITY AND INCREASE THE CONCENTRATION OF Aqueous MAGNESIA PASTE
JPS5441220A (en) * 1977-09-09 1979-04-02 Nippon Steel Corp Manufacture of oriented electrical steel sheet with superior magnetic characteristics
JPS5466935A (en) * 1977-11-09 1979-05-29 Kawasaki Steel Co Method of forming forsterite insulating layer in directive silicon steel plate
JPS54128928A (en) * 1978-03-31 1979-10-05 Nippon Steel Corp Protective coating material for annealing of anisotropic silicon steel plate
JPS6096770A (en) * 1983-10-28 1985-05-30 Nippon Steel Corp Preparation of oriented electromagnetic steel plate excellent in iron loss
DE3875676T2 (en) * 1987-08-31 1993-03-18 Nippon Steel Corp METHOD FOR PRODUCING CORNORIENTED STEEL SHEETS WITH METAL GLOSS AND EXCELLENT PUNCHABILITY.

Also Published As

Publication number Publication date
KR910006518A (en) 1991-04-29
EP0416420B1 (en) 1994-12-14
EP0416420A3 (en) 1992-11-19
KR0173781B1 (en) 1999-02-18
JPH03120376A (en) 1991-05-22
BR9004444A (en) 1991-09-10
DE69015060D1 (en) 1995-01-26
DE69015060T2 (en) 1995-04-27
JP2686455B2 (en) 1997-12-08
EP0416420A2 (en) 1991-03-13
CA2024226C (en) 2000-02-15

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Legal Events

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