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Title:
INSULATION FILM OF DIRECTIVE ELECTRICAL STEEL SHEET, AND FORMING METHOD THEREOF
Document Type and Number:
Japanese Patent JP2017075358
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an insulation film for a directive electromagnetic steel sheet of a high coating tension thereby to reduce the iron loss of the directive electromagnetic steel sheet.SOLUTION: An insulation film made of a composite oxide of Li, Al and Si and having a β-quarts type crystal structure, wherein an aqueous solution mixed with kaolinite powder and water-soluble lithium salt, kaolinite powder and silicic lithium, kaolinite powder, water-soluble lithium salt and colloidal silica, or kaolinite, water-soluble lithium salt, colloidal silica and silicic lithium is applied to and dried on a tropism electromagnetic plate surface, and by baking the dried solution at 700°C to 1000°C, wherein the coating tension is 8.5 MPa or higher. A method forms a directive electromagnetic sheet at a molar ratio of Al to Li at 0.8 to 1.2, and the molar ratio of Si to Li at 0.8 to 3.5.SELECTED DRAWING: Figure 1

Inventors:
YAMAZAKI SHUICHI
FUJII HIROYASU
TAKEDA KAZUTOSHI
Application Number:
JP2015202964A
Publication Date:
April 20, 2017
Filing Date:
October 14, 2015
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
C23C22/00; H01F1/16; H01F1/18
Domestic Patent References:
JPS6342705B21988-08-25
JP2001172048A2001-06-26
JP2000192249A2000-07-11
JP2014201806A2014-10-27
JPS60255980A1985-12-17
JP2003166069A2003-06-13
JP2003301271A2003-10-24
JPH11240736A1999-09-07
JPH06287765A1994-10-11
JP2010043293A2010-02-25
JPH06287764A1994-10-11
JP2000169973A2000-06-20
JPS60258477A1985-12-20
JPH05279747A1993-10-26
Foreign References:
US4496399A1985-01-29
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Fukuchi Ritsuo
Nakamura Asayuki
Hideo Tokunaga