WO2016158325A1 - 絶縁被膜付き方向性電磁鋼板およびその製造方法 - Google Patents
絶縁被膜付き方向性電磁鋼板およびその製造方法 Download PDFInfo
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- WO2016158325A1 WO2016158325A1 PCT/JP2016/057850 JP2016057850W WO2016158325A1 WO 2016158325 A1 WO2016158325 A1 WO 2016158325A1 JP 2016057850 W JP2016057850 W JP 2016057850W WO 2016158325 A1 WO2016158325 A1 WO 2016158325A1
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- steel sheet
- baking
- electrical steel
- grain
- oriented electrical
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 title abstract description 49
- 239000010959 steel Substances 0.000 title abstract description 49
- 238000000034 method Methods 0.000 title abstract description 21
- 238000000576 coating method Methods 0.000 claims abstract description 121
- 239000011248 coating agent Substances 0.000 claims abstract description 113
- 238000010521 absorption reaction Methods 0.000 claims abstract description 43
- 238000001228 spectrum Methods 0.000 claims abstract description 22
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 17
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- 229910052788 barium Inorganic materials 0.000 claims abstract description 14
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 14
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 14
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 238000000833 X-ray absorption fine structure spectroscopy Methods 0.000 claims abstract 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims description 72
- 239000007788 liquid Substances 0.000 claims description 55
- 229910019142 PO4 Inorganic materials 0.000 claims description 47
- 239000010452 phosphate Substances 0.000 claims description 46
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 43
- 238000009832 plasma treatment Methods 0.000 claims description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 27
- 239000008119 colloidal silica Substances 0.000 claims description 27
- 150000001875 compounds Chemical class 0.000 claims description 27
- 239000001257 hydrogen Substances 0.000 claims description 27
- 229910052739 hydrogen Inorganic materials 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 23
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 20
- 238000000137 annealing Methods 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 20
- 239000012298 atmosphere Substances 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 18
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims 1
- 235000021317 phosphate Nutrition 0.000 description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 41
- 238000012360 testing method Methods 0.000 description 21
- 238000001035 drying Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 10
- 239000011777 magnesium Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000012299 nitrogen atmosphere Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 3
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 2
- 241000080590 Niso Species 0.000 description 2
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 2
- 238000006482 condensation reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004137 magnesium phosphate Substances 0.000 description 2
- 235000010994 magnesium phosphates Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000005469 synchrotron radiation Effects 0.000 description 2
- 229910019931 (NH4)2Fe(SO4)2 Inorganic materials 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- -1 chromic acid compound Chemical class 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229940075110 dibasic magnesium phosphate Drugs 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- MHJAJDCZWVHCPF-UHFFFAOYSA-L dimagnesium phosphate Chemical compound [Mg+2].OP([O-])([O-])=O MHJAJDCZWVHCPF-UHFFFAOYSA-L 0.000 description 1
- XZTWHWHGBBCSMX-UHFFFAOYSA-J dimagnesium;phosphonato phosphate Chemical compound [Mg+2].[Mg+2].[O-]P([O-])(=O)OP([O-])([O-])=O XZTWHWHGBBCSMX-UHFFFAOYSA-J 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 229910000400 magnesium phosphate tribasic Inorganic materials 0.000 description 1
- QQFLQYOOQVLGTQ-UHFFFAOYSA-L magnesium;dihydrogen phosphate Chemical compound [Mg+2].OP(O)([O-])=O.OP(O)([O-])=O QQFLQYOOQVLGTQ-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- RHJYKEDKMHDZBL-UHFFFAOYSA-L metaphosphoric acid (hpo3), magnesium salt Chemical compound [Mg+2].[O-]P(=O)=O.[O-]P(=O)=O RHJYKEDKMHDZBL-UHFFFAOYSA-L 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/22—Orthophosphates containing alkaline earth metal cations
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/18—Orthophosphates containing manganese cations
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/20—Orthophosphates containing aluminium cations
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
- C23C22/33—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also phosphates
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
- C23C22/42—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also phosphates
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
Definitions
- the present invention relates to a grain-oriented electrical steel sheet with an insulating coating and a method for producing the same.
- a coating is provided on the surface in order to provide insulation, workability, rust prevention, and the like.
- a surface film is composed of a base film mainly composed of forsterite formed during final finish annealing and a phosphate-based topcoat film formed thereon.
- insulating coating of the coatings provided on the surface of the grain-oriented electrical steel sheet, only the latter top coating film is referred to as “insulating coating”.
- Patent Documents 1 and 2 include an insulating film formed from a treatment solution containing phosphate (aluminum phosphate, magnesium phosphate, etc.), colloidal silica, and chromic anhydride. Is disclosed.
- Patent Document 3 discloses a technique using an oxide colloid instead of chromic anhydride.
- the grain-oriented electrical steel sheet with an insulating coating may also be simply referred to as “directional magnetic steel sheet” or “steel sheet”.
- JP 48-39338 A Japanese Patent Laid-Open No. 50-79442 JP 2000-169972 A
- Patent Documents 1 to 3 The inventors have examined the insulating coatings disclosed in Patent Documents 1 to 3, and found that the heat resistance is insufficient and sticking may not be sufficiently suppressed.
- the present invention has been made in view of the above points, and an object thereof is to provide a grain-oriented electrical steel sheet with an insulating coating having an insulating coating excellent in heat resistance and a method for producing the same.
- the present inventors have found that the change in the bonding state between P and O in the insulating film affects the quality of heat resistance, and A technique for controlling the bonding state of P and O to a state having good heat resistance has been found, and the present invention has been completed.
- the present invention provides the following (1) to (6).
- (1) having a grain-oriented electrical steel sheet and an insulating film disposed on the surface of the grain-oriented electrical steel sheet, wherein the insulation film is made of Mg, Ca, Ba, Sr, Zn, Al, and Mn.
- a directional electromagnetic wave with an insulating coating which contains at least one selected from Si, P and O, and the XAFS spectrum of the K absorption edge of P of the insulating coating shows three absorption peaks between 2156 eV and 2180 eV steel sheet.
- (2) A directional electrical steel sheet with an insulation coating obtained by applying a treatment liquid to the surface of a finish annealed directional electrical steel sheet and then baking to obtain the directional electrical steel sheet with an insulation coating according to (1) above.
- the treatment liquid contains at least one phosphate selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al and Mn, and colloidal silica
- the content of the colloidal silica in the treatment liquid is 50 to 150 parts by mass in terms of solid content with respect to 100 parts by mass of the total solid content of the phosphate
- the baking temperature T (Unit: ° C) is 850 ⁇ T ⁇ 1000
- hydrogen concentration H 2 in the baking atmosphere (unit: volume%) is 0.3 ⁇ H 2 ⁇ 230 ⁇ 0.2 T
- baking time Time at baking temperature T (unit) : Seconds) is 5 ⁇ Time ⁇ 860 ⁇ 0.8T Plus, manufacturing method of the insulating film with oriented electrical steel sheets.
- a method for producing a coated grain-oriented electrical steel sheet wherein the treatment liquid is at least one phosphate selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn, colloidal silica,
- the content of the colloidal silica in the treatment liquid is 50 to 150 parts by mass in terms of solid content with respect to 100 parts by mass in total of the solid content of the phosphate.
- the baking temperature T (unit: ° C.) is 800 ⁇ T ⁇ 1000
- the hydrogen concentration H 2 (unit: volume%) in the baking atmosphere is 0 ⁇ H 2 ⁇ 230 ⁇ 0.2 T
- the baking is performed at the baking temperature T.
- Time Time (unit: second) is Time ⁇ 00
- the plasma treatment is a treatment in which the surface of the grain-oriented electrical steel sheet after baking is irradiated with plasma generated from a plasma gas containing 0.3% by volume or more of hydrogen for 0.10 seconds or more.
- a method for producing a coated grain-oriented electrical steel sheet (5) The finish-annealed grain-oriented electrical steel sheet coated with the treatment liquid is held at a temperature of 150 to 450 ° C. for 10 seconds or longer, and then subjected to the baking and the plasma treatment.
- a method for producing a grain-oriented electrical steel sheet with an insulating coating is
- the treatment liquid further comprises:
- the M compound is contained, and the content of the M compound in the treatment liquid is 10 to 100 parts by mass in terms of oxide with respect to 100 parts by mass in total of the solid content of the phosphate (2 ) To (5).
- the thickness of 0.23 mm finished annealed grain-oriented electrical steel sheet manufactured by a known method is sheared to a size of 300 mm ⁇ 100 mm, unreacted annealing separator is removed, and then strain relief annealing is performed. (800 ° C., 2 hours, N 2 atmosphere).
- a treatment liquid for forming an insulating coating was applied to the steel sheet after light pickling with 5% by mass phosphoric acid.
- the basis weight after baking is 10 g / m 2 in total on both sides. It applied so that it might become.
- the steel plate coated with the treatment liquid is placed in a drying furnace, dried at 300 ° C. for 1 minute, and then baked under two different baking conditions, thereby providing directionality with two insulating coatings. An electromagnetic steel sheet was obtained. Under the first baking condition (baking condition 1), baking was performed at 850 ° C. for 1 minute in a 100% N 2 atmosphere. Under the second baking condition (baking condition 2), baking was performed at 900 ° C.
- the insulating coating of the steel plate obtained under the baking condition 1 may be referred to as “insulating coating A”, and the insulating coating of the steel plate obtained under the baking condition 2 may be referred to as “insulating coating B”.
- the heat resistance of the insulating coating A and the insulating coating B was evaluated by a drop weight test. Specifically, after the obtained steel plate was sheared into 50 mm ⁇ 50 mm test pieces, 10 sheets were laminated, and compression-load annealing at 2 kg / cm 2 was performed at 830 ° C. for 3 hours in a nitrogen atmosphere. Then, 500 g of weight was dropped from a height of 20 to 120 cm at intervals of 20 cm, and the heat resistance of the insulating coating was evaluated based on the height of the weight (drop weight height) when all the 10 test pieces were separated. In addition, it was set to 0 cm when all the 10 test pieces were separated after the compression weight annealing before the drop weight test.
- the insulating coating When separated at a drop height of 40 cm or less, the insulating coating can be evaluated as having excellent heat resistance.
- the insulation coating A had a drop weight height of 100 cm and was inferior in heat resistance.
- the insulation coating B has a drop height of 40 cm and exhibits good heat resistance.
- FePO 4 is measured as a standard substance and the white line is set to 2153 eV, or various magnesium phosphates of the reagent are measured to confirm the absolute accuracy of the peak position. It is preferable. Also, the absorption intensity may be normalized for each measurement using a Ni mesh or the like.
- FIG. 1 is an XAFS spectrum of the K absorption edge of P for each insulating coating and reference reagent. Specifically, FIG. 1 shows insulating coating A and insulating coating B, and five kinds of reference reagents (primary magnesium phosphate, magnesium metaphosphate, dibasic magnesium phosphate, magnesium pyrophosphate, and tertiary magnesium phosphate. ) Shows the XAFS spectrum of the K absorption edge of P. In any spectrum, an absorption peak (corresponding to a fine structure) exists between 2156 eV and 2180 eV.
- the absorption peak existing between 2156 eV and 2180 eV is different. Then, it was found that there is one strong peak in the vicinity of 2172 eV, whereas in the insulating coating B, there are three peaks in the vicinity of 2158 eV, 2165 eV, and 2172 eV.
- P in the insulating coating A having poor heat resistance is in a state close to the primary phosphate of the raw material, despite being baked.
- P in the insulating coating B with good heat resistance is estimated to be close to the state of P in the tertiary phosphate.
- the phosphate dehydrates and condenses, the primary phosphate changes to the secondary phosphate and tertiary phosphate, so in the insulating coating B with good heat resistance, the phosphate It is considered that the condensation reaction proceeds.
- the grain-oriented electrical steel sheet with an insulating coating of the present invention (hereinafter simply referred to as “the grain-oriented electrical steel sheet of the present invention” or “the steel sheet of the present invention”) is provided on the surface of the grain-oriented electrical steel sheet and the grain-oriented electrical steel sheet.
- the insulating coating contains at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al and Mn, and Si, P and O, and This is a grain-oriented electrical steel sheet with an insulating coating, in which the XAFS spectrum at the K absorption edge of P of the insulating coating shows three absorption peaks between 2156 eV and 2180 eV.
- each element contained in the insulating coating can be confirmed by a conventionally known method, but in the present invention, at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn.
- the insulating coating formed using the treatment liquid containing the phosphate of the above and colloidal silica is at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al and Mn, and Si. , P and O.
- the insulating film in the present invention shows three absorption peaks in the XAFS spectrum of the K absorption edge of P between 2156 eV and 2180 eV (see FIG. 1). Thereby, as above-mentioned, heat resistance is excellent.
- grain-oriented electrical steel sheet A conventionally well-known grain-oriented electrical steel sheet can be used.
- grain-oriented electrical steel sheets are obtained by hot rolling a silicon-containing steel slab by a known method and finishing it to a final thickness by one or multiple cold rolling sandwiching intermediate annealing, followed by primary recrystallization annealing. It is manufactured by applying an annealing separator and then performing a final finish annealing.
- the first aspect of the production method of the present invention is that the surface of the grain-oriented electrical steel sheet that has been subjected to finish annealing is coated with a treatment liquid and then baked to obtain the grain-oriented electrical steel sheet with the insulation film of the present invention.
- the content of the colloidal silica in the treatment liquid is 50 to 150 parts by mass in terms of solid content with respect to 100 parts by mass in total of the solid content of the phosphate.
- the baking temperature T (unit: ° C.) is 850 ⁇ T ⁇ 1000
- the hydrogen concentration H 2 (unit: volume%) in the baking atmosphere is 0.3 ⁇ H 2 ⁇ 230-0.2 T
- the baking is performed at the baking temperature T.
- Time Time (unit: second) is 5 ⁇ Time ⁇ 86 Meet -0.8T, a manufacturing method of the insulating film with oriented electrical steel sheets.
- the treatment liquid is a treatment liquid for forming an insulating film, and contains at least one phosphate selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and colloidal silica. It is a processing liquid.
- the metal species of the phosphate is not particularly limited as long as it is at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn.
- phosphates of alkali metals Li, Na, etc.
- a phosphate may be used individually by 1 type and may use 2 or more types together. By using two or more kinds in combination, the physical property values of the resulting insulating coating can be precisely controlled.
- a primary phosphate (heavy phosphate) is preferably exemplified.
- the average particle size of the colloidal silica is preferably 5 to 200 nm, more preferably 10 to 100 nm, from the viewpoint of availability and cost.
- the average particle diameter of colloidal silica can be measured by the BET method (converted from the specific surface area by the adsorption method). It is also possible to substitute an average value actually measured from an electron micrograph.
- the content of colloidal silica in the treatment liquid is 50 to 150 parts by mass, preferably 50 to 100 parts by mass in terms of SiO 2 solid content, with respect to 100 parts by mass of the total solid content of phosphate. If the colloidal silica content is too small, the effect of reducing the thermal expansion coefficient of the insulating coating is reduced, and the tension applied to the steel sheet may be reduced. On the other hand, when the content of colloidal silica is too large, crystallization of the insulating film is likely to proceed during baking, which will be described later, and the tension applied to the steel sheet may also decrease. However, if the colloidal silica content is within the above range, an appropriate tension is imparted to the steel sheet by the insulating coating, and the effect of improving iron loss is excellent.
- the liquid may further contain an M compound.
- tensile_strength which an insulating film provides to a steel plate improves, and it is excellent also in the moisture absorption resistance of an insulating film besides being excellent in the improvement effect of an iron loss.
- the mode of the M compound contained in the treatment liquid is not particularly limited, but a water-soluble metal salt mode is particularly preferable, and an oxide mode is next preferable.
- the oxide include oxide particles having a primary particle diameter of 1 ⁇ m, and preferably 500 nm or less.
- Examples of the Ti compound include TiO 2 and Ti 2 O 3 .
- Examples of the V compound include NH 4 VO 3 and V 2 O 5 .
- Examples of the Cr compound include a chromic acid compound, and specific examples thereof include chromic anhydride (CrO 3 ), chromate, and dichromate.
- Examples of the Mn compound include Mn (NO 3 ) 2 , MnSO 4 , MnCO 3 and the like.
- Examples of the Fe compound include (NH 4 ) 2 Fe (SO 4 ) 2 , Fe (NO 3 ) 3 , FeSO 4 .7H 2 O, Fe 2 O 3 and the like.
- Examples of the Co compound include Co (NO 3 ) 2 and CoSO 4 .
- Examples of the Ni compound include Ni (NO 3 ) 2 and NiSO 4 .
- Examples of the Cu compound include Cu (NO 3 ) 2 and CuSO 4 .5H 2 O.
- Examples of the Zn compound include Zn (NO 3 ) 2 , ZnSO 4 , ZnCO 3 and the like.
- Examples of the Zr compound include Zr (SO 4 ) 2 .4H 2 O, ZrO 2 and the like.
- Examples of the Mo compound include MoS 2 and MoO 2 .
- Examples of the W compound include K 2 WO 4 and WO 3 .
- Such M compounds may be used alone or in combination of two or more.
- the content of the M compound is preferably 5 to 150 parts by mass, and more preferably 10 to 100 parts by mass in terms of oxide with respect to 100 parts by mass of the total solid content of the phosphate. If the content of the M compound is too small, the above improvement effect may not be obtained sufficiently. On the other hand, when there is too much content of M compound, it will become difficult to obtain a precise
- the “oxide conversion” in the content of the M compound is specifically as follows when enumerated for each metal species of M.
- Ti TiO 2 conversion, V: V 2 O 5 conversion, Cr: CrO 3 conversion, Mn: MnO conversion, Fe: FeO conversion, Co: CoO conversion, Ni: NiO conversion, Cu: CuO conversion, Zn: ZnO conversion, Zr: ZrO 2 conversion, Mo: MoO 3 conversion, W: WO 3 conversion
- ⁇ Application of treatment liquid> It does not specifically limit as a method of apply
- the treatment liquid is preferably applied to both sides of the steel sheet, and more preferably applied so that the basis weight after baking is 4 to 15 g / m 2 in total. This is because if the amount is too small, the interlayer resistance may decrease, and if the amount is too large, the space factor may decrease greatly.
- ⁇ Dry> Moisture dries in the temperature rising process of baking, so drying does not have to be performed separately before baking.
- the viewpoint of preventing film formation failure due to sudden heating, and one of the features of the present invention, is during baking. From the viewpoint of stably controlling the bonding state of the phosphate by reducing the insulating film, it is preferable to sufficiently dry the treatment liquid before baking, and the treatment liquid was applied before baking. More preferably, the grain-oriented electrical steel sheet is dried (temporarily baked). Specifically, for example, it is preferable to dry the steel plate coated with the treatment liquid in a drying furnace and hold at 150 to 450 ° C. for 10 seconds or more. If it is less than 150 ° C.
- drying may be insufficient and a desired bonded state may be difficult to obtain, and at temperatures higher than 450 ° C., the steel sheet may be oxidized during drying. However, if it is 150 to 450 ° C. for 10 seconds or longer, it can be sufficiently dried while suppressing oxidation of the steel sheet. The longer the drying time, the better. However, if the drying time is longer than 120 seconds, the productivity tends to decrease, so 120 seconds or less is preferable.
- the grain-oriented electrical steel sheet dried after application of the treatment liquid is baked to form an insulating coating.
- the XAFS spectrum of the K absorption edge of P of the insulating film needs to show three absorption peaks between 2156 eV and 2180 eV.
- a method for forming such an insulating film is not particularly limited, but as an example of a method for obtaining the above-described configuration, a condition for baking may be a specific condition.
- the baking temperature T (unit: ° C.) is 850 ⁇ T ⁇ 1000.
- the baking temperature (T) may be 850 ° C. or higher.
- the temperature is set to 1000 ° C. or lower. .
- the hydrogen concentration H 2 (unit: volume%) in the baking atmosphere is 0.3 ⁇ H 2 ⁇ 230 ⁇ 0.2T.
- the hydrogen concentration (H 2 ) may be 0.3 vol% or more.
- the limit concentration is related to the baking temperature (T), and H 2 ⁇ 230 ⁇ 0.2T.
- the remainder other than hydrogen is preferably an inert gas, and more preferably nitrogen.
- the baking time Time (unit: second) is 5 ⁇ Time ⁇ 860 ⁇ 0.8T.
- the baking temperature T should be 5 seconds or more.
- the limit time is related to the baking temperature (T), and Time ⁇ 860 ⁇ 0.8T.
- the treatment liquid is at least one phosphate selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn.
- colloidal silica and the content of the colloidal silica in the treatment liquid is 50 to 150 parts by mass in terms of solid content with respect to 100 parts by mass in total of the solid content of the phosphate.
- the baking temperature T (unit: ° C.) is 800 ⁇ T ⁇ 1000
- the hydrogen concentration H 2 (unit: volume%) in the baking atmosphere is 0 ⁇ H 2 ⁇ 230 ⁇ 0.2 T
- Baking time at baking temperature T (Unit: seconds) satisfies Time ⁇ 300
- the plasma treatment is performed for 0.10 seconds or more of plasma generated from a plasma gas containing 0.3% by volume or more of hydrogen on the surface of the grain-oriented electrical steel sheet after baking. It is a manufacturing method of the grain-oriented electrical steel sheet with an insulation film which is the process to irradiate.
- the conditions other than the baking and plasma treatment are the same as those in the first aspect, and thus the description thereof is omitted.
- the baking temperature T (unit: ° C.) can also be set in a wider range than the condition of the first aspect (850 ⁇ T ⁇ 1000), and in the second aspect, 800 ⁇ T ⁇ 1000. Furthermore, the baking time Time (unit: second) at the baking temperature T may be Time ⁇ 300.
- the XAFS spectrum of the K absorption edge of P has three absorption peaks between 2156 eV and 2180 eV by further performing a specific plasma treatment.
- An insulating film having excellent heat resistance is obtained.
- the surface of the grain-oriented electrical steel sheet after baking is irradiated with plasma generated from a plasma gas containing 0.3% by volume or more of hydrogen for 0.10 seconds or more.
- the plasma treatment is often performed in a vacuum state, and in the present invention, vacuum plasma can be preferably used, but is not limited thereto, and for example, atmospheric pressure plasma can also be used.
- the atmospheric pressure plasma is plasma generated under atmospheric pressure.
- the “atmospheric pressure” may be a pressure near atmospheric pressure, for example, a pressure of 1.0 ⁇ 10 4 to 1.5 ⁇ 10 5 Pa.
- plasma is generated by applying a high frequency voltage between opposing electrodes to discharge in plasma gas (working gas) under atmospheric pressure, and this is irradiated onto the surface of the steel sheet.
- the plasma gas (working gas) needs to contain 0.3% by volume or more of hydrogen.
- the hydrogen concentration is less than 0.3% by volume, excellent heat resistance cannot be obtained even if plasma treatment is performed.
- the upper limit value of the hydrogen concentration in the plasma gas is not particularly limited, but is preferably 50% by volume or less, and more preferably 10% by volume or less.
- the remaining gas other than hydrogen in the plasma gas is preferably helium, argon, or the like because the plasma is easily generated.
- the plasma treatment is preferably performed after the baked steel sheet has become 100 ° C. or less. That is, it is preferable to irradiate the surface of the steel sheet after baking, which has become a temperature of 100 ° C. or less. If this temperature is too high, the plasma generation part may become high temperature and a problem may occur, but if it is 100 ° C. or less, the problem can be suppressed.
- the plasma gas temperature is preferably 200 ° C. or lower, and more preferably 150 ° C. or lower, from the viewpoint of not imparting thermal strain to the steel sheet.
- the directional electrical steel sheet with insulating coating of each example was sheared into 50 mm ⁇ 50 mm test pieces, 10 sheets were laminated, and compression-load annealing at 2 kg / cm 2 was performed at 830 ° C. for 3 hours in a nitrogen atmosphere. Thereafter, 500 g of a weight was dropped from a height of 20 to 120 cm at intervals of 20 cm, and the heat resistance of the insulating coating was evaluated based on the height of the weight (drop weight height) when all the 10 test pieces were separated. In addition, it was set to 0 cm when all the 10 test pieces were separated after the compression weight annealing before the drop weight test. When separated at a drop height of 40 cm or less, the insulating coating can be evaluated as having excellent heat resistance. The results are shown in Table 1 below.
- the directional electrical steel sheet with insulating coating of each example was sheared into 50 mm ⁇ 50 mm test pieces, 10 sheets were laminated, and compression-load annealing at 2 kg / cm 2 was performed at 830 ° C. for 3 hours in a nitrogen atmosphere. Thereafter, 500 g of a weight was dropped from a height of 20 to 120 cm at intervals of 20 cm, and the heat resistance of the insulating coating was evaluated based on the height of the weight (drop weight height) when all the 10 test pieces were separated. In addition, it was set to 0 cm when all the 10 test pieces were separated after the compression weight annealing before the drop weight test. When separated at a drop height of 40 cm or less, the insulating coating can be evaluated as having excellent heat resistance. The results are shown in Table 2 below.
- the steel plate temperature after baking was room temperature.
- the steel sheet was irradiated with atmospheric pressure plasma.
- a PF-DFL manufactured by Plasma Factory was used as the atmospheric pressure plasma apparatus, and a linear plasma head having a width of about 300 mm was used as the plasma head.
- the gas type of the plasma gas (working gas) was Ar, Ar—N 2 , or Ar—H 2 , and the total flow rate was 30 L / min.
- the width of the plasma was 3 mm.
- the irradiation time was changed by changing the conveying speed of the steel sheet while fixing the plasma head, and the plasma treatment was uniformly performed on the entire surface of the steel sheet.
- the irradiation time was calculated by dividing the plasma width (3 mm) by the conveyance speed (unit: mm / second).
- the directional electrical steel sheet with insulating coating of each example was sheared into 50 mm ⁇ 50 mm test pieces, 10 sheets were laminated, and compression-load annealing at 2 kg / cm 2 was performed at 830 ° C. for 3 hours in a nitrogen atmosphere. Thereafter, 500 g of a weight was dropped from a height of 20 to 120 cm at intervals of 20 cm, and the heat resistance of the insulating coating was evaluated based on the height of the weight (drop weight height) when all the 10 test pieces were separated. In addition, it was set to 0 cm when all the 10 test pieces were separated after the compression weight annealing before the drop weight test. When separated at a drop height of 40 cm or less, the insulating coating can be evaluated as having excellent heat resistance. The results are shown in Table 3 below.
- the insulating film in the invention example in which three peaks appear by the subsequent plasma treatment is heat resistant. It turned out to be excellent.
- the M compound added to the treatment liquid is shown below for each M metal species.
- the steel plate temperature after baking was room temperature.
- the steel sheet was irradiated with atmospheric pressure plasma.
- a PF-DFL manufactured by Plasma Factory was used as the atmospheric pressure plasma apparatus, and a linear plasma head having a width of about 300 mm was used as the plasma head.
- the gas type of the plasma gas (working gas) was Ar, Ar—N 2 , or Ar—H 2 , and the total flow rate was 30 L / min.
- the width of the plasma was 3 mm.
- the irradiation time was changed by changing the conveying speed of the steel sheet while fixing the plasma head, and the plasma treatment was uniformly performed on the entire surface of the steel sheet.
- the irradiation time was calculated by dividing the plasma width (3 mm) by the conveyance speed (unit: mm / second).
- the directional electrical steel sheet with insulating coating of each example was sheared into 50 mm ⁇ 50 mm test pieces, 10 sheets were laminated, and compression-load annealing at 2 kg / cm 2 was performed at 830 ° C. for 3 hours in a nitrogen atmosphere. Thereafter, 500 g of a weight was dropped from a height of 20 to 120 cm at intervals of 20 cm, and the heat resistance of the insulating coating was evaluated based on the height of the weight (drop weight height) when all the 10 test pieces were separated. In addition, it was set to 0 cm when all the 10 test pieces were separated after the compression weight annealing before the drop weight test. When separated at a drop height of 40 cm or less, the insulating coating can be evaluated as having excellent heat resistance. The results are shown in Table 4 below.
- the insulating film in the invention example in which three peaks appear by the subsequent plasma treatment is heat resistant. It turned out to be excellent.
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Abstract
Description
なお、以下では、方向性電磁鋼板の表面に設けられる被膜のうち、後者の上塗り被膜のみを「絶縁被膜」と呼ぶ。
このような要求を満たすため、例えば、特許文献1および2には、リン酸塩(リン酸アルミニウム、リン酸マグネシウム等)、コロイド状シリカおよび無水クロム酸を含有する処理液から形成される絶縁被膜が開示されている。
また、近年、環境保全意識の高まりからCrを含有しない絶縁被膜の開発も行なわれており、例えば、特許文献3には、無水クロム酸に代えて、酸化物コロイドを用いる技術が開示されている。
なお、以下では、絶縁被膜付き方向性電磁鋼板も、単に、「方向性電磁鋼板」または「鋼板」と呼ぶ場合がある。
この際、絶縁被膜の耐熱性が低いと、積層された鋼板どうしが癒着(スティッキング)を起こし、その後の作業性が低下する場合がある。また、スティッキングによって磁気特性が劣化する場合もある。
(1)方向性電磁鋼板と、上記方向性電磁鋼板の表面上に配置された絶縁被膜とを有し、上記絶縁被膜が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種と、Si、PおよびOとを含有し、上記絶縁被膜のPのK吸収端のXAFSスペクトルが、2156eVから2180eVの間に3つの吸収ピークを示す、絶縁被膜付き方向性電磁鋼板。
(2)仕上焼鈍済みの方向性電磁鋼板の表面に、処理液を塗布した後に、焼付を施し、上記(1)に記載の絶縁被膜付き方向性電磁鋼板を得る、絶縁被膜付き方向性電磁鋼板の製造方法であって、上記処理液が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種のリン酸塩と、コロイド状シリカと、を含有し、上記処理液中の上記コロイド状シリカの含有量が、上記リン酸塩の固形分合計100質量部に対して、固形分換算で、50~150質量部であり、上記焼付の条件として、焼付温度T(単位:℃)が850≦T≦1000、焼付雰囲気中の水素濃度H2(単位:体積%)が0.3≦H2≦230-0.2T、焼付温度Tでの焼付時間Time(単位:秒)が5≦Time≦860-0.8Tを満たす、絶縁被膜付き方向性電磁鋼板の製造方法。
(3)上記処理液を塗布した上記仕上焼鈍済みの方向性電磁鋼板を、150~450℃の温度で10秒以上保持した後、上記焼付を施す、上記(2)に記載の絶縁被膜付き方向性電磁鋼板の製造方法。
(4)仕上焼鈍済みの方向性電磁鋼板の表面に、処理液を塗布した後に、焼付およびプラズマ処理をこの順で施し、上記(1)に記載の絶縁被膜付き方向性電磁鋼板を得る、絶縁被膜付き方向性電磁鋼板の製造方法であって、上記処理液が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種のリン酸塩と、コロイド状シリカと、を含有し、上記処理液中の上記コロイド状シリカの含有量が、上記リン酸塩の固形分合計100質量部に対して、固形分換算で、50~150質量部であり、上記焼付の条件として、焼付温度T(単位:℃)が800≦T≦1000、焼付雰囲気中の水素濃度H2(単位:体積%)が0≦H2≦230-0.2T、焼付温度Tでの焼付時間Time(単位:秒)がTime≦300を満たし、上記プラズマ処理は、上記焼付後の上記方向性電磁鋼板の表面に、水素0.3体積%以上含むプラズマガスから発生させたプラズマを0.10秒以上照射する処理である、絶縁被膜付き方向性電磁鋼板の製造方法。
(5)上記処理液を塗布した上記仕上焼鈍済みの方向性電磁鋼板を、150~450℃の温度で10秒以上保持した後、上記焼付および上記プラズマ処理を施す、上記(4)に記載の絶縁被膜付き方向性電磁鋼板の製造方法。
(6)Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、Zr、MoおよびWからなる群から選ばれる少なくとも1種を、Mとした場合において、上記処理液が、さらに、M化合物を含有し、上記処理液中の上記M化合物の含有量が、上記リン酸塩の固形分合計100質量部に対して、酸化物換算で、10~100質量部である、上記(2)~(5)のいずれかに記載の絶縁被膜付き方向性電磁鋼板の製造方法。
最初に、本発明を完成するきっかけとなったXAFS(エックス線吸収微細構造(X-ray absorption fine structure))による知見について説明する。
まず、公知の方法で製造された板厚:0.23mmの仕上焼鈍済みの方向性電磁鋼板を、300mm×100mmの大きさにせん断し、未反応の焼鈍分離剤を除去した後、歪取焼鈍(800℃、2時間、N2雰囲気)を施した。
次に、5質量%リン酸で軽酸洗した後の鋼板に、絶縁被膜形成用の処理液を塗布した。処理液には、第一リン酸アルミニウム水溶液を固形分換算で100質量部、コロイド状シリカを固形分換算で80質量部添加し、これを、焼付後の目付量が両面合計で10g/m2となるように塗布した。
処理液を塗布した鋼板を、乾燥炉に装入して、300℃で1分間の乾燥を施し、その後、2種の異なる焼付条件で焼付を施し、これにより、2種の絶縁被膜付き方向性電磁鋼板を得た。1つ目の焼付条件(焼付条件1)では、100%N2雰囲気下、850℃で1分間の焼付を施した。2つ目の焼付条件(焼付条件2)では、窒素95体積%-水素5体積%の混合雰囲気下、900℃で30秒間の焼付を施した。
以下、便宜的に、焼付条件1で得られた鋼板の絶縁被膜を「絶縁被膜A」と称し、焼付条件2で得られた鋼板の絶縁被膜を「絶縁被膜B」と称する場合がある。
40cm以下の落重高さで分離した場合、その絶縁被膜は耐熱性に優れるものとして評価できる。絶縁被膜Aは、落重高さが100cmであり、耐熱性が劣っていた。一方、絶縁被膜Bは、落重高さが40cmであり、良好な耐熱性を示すことが確認された。
リン酸塩が脱水縮合していくと、第一リン酸塩から第二リン酸塩、第三リン酸塩へと変化していくことから、耐熱性が良好な絶縁被膜Bでは、リン酸塩の縮合反応が進行しているものと考えられる。縮合反応が進行すると、PとOとの結合が増加するため、構造が強化され、ガラス質を主成分とする絶縁被膜の高温での粘度が上昇し、これにより、スティッキングが発生しにくくなり、耐熱性が向上したと考えられる。
本発明の絶縁被膜付き方向性電磁鋼板(以下、単に「本発明の方向性電磁鋼板」または「本発明の鋼板」ともいう)は、方向性電磁鋼板と、上記方向性電磁鋼板の表面上に配置された絶縁被膜とを有し、上記絶縁被膜が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種と、Si、PおよびOとを含有し、上記絶縁被膜のPのK吸収端のXAFSスペクトルが、2156eVから2180eVの間に3つの吸収ピークを示す、絶縁被膜付き方向性電磁鋼板である。
次に、本発明の鋼板を得るための、本発明の絶縁被膜付き方向性電磁鋼板の製造方法の一例(以下、単に「本発明の製造方法」ともいう)について説明する。
本発明の製造方法として、第1態様および第2態様を説明する。
本発明の製造方法の第1態様は、仕上焼鈍済みの方向性電磁鋼板の表面に、処理液を塗布した後に、焼付を施し、本発明の絶縁被膜付き方向性電磁鋼板を得る、絶縁被膜付き方向性電磁鋼板の製造方法であって、上記処理液が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種のリン酸塩と、コロイド状シリカと、を含有し、上記処理液中の上記コロイド状シリカの含有量が、上記リン酸塩の固形分合計100質量部に対して、固形分換算で、50~150質量部であり、上記焼付の条件として、焼付温度T(単位:℃)が850≦T≦1000、焼付雰囲気中の水素濃度H2(単位:体積%)が0.3≦H2≦230-0.2T、焼付温度Tでの焼付時間Time(単位:秒)が5≦Time≦860-0.8Tを満たす、絶縁被膜付き方向性電磁鋼板の製造方法である。
処理液は、絶縁被膜形成用の処理液であって、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種のリン酸塩と、コロイド状シリカとを少なくとも含有する処理液である。
リン酸塩の金属種としては、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種であれば特に限定されない。なお、アルカリ金属(Li、Na等)のリン酸塩は、得られる絶縁被膜の耐熱性および耐吸湿性が著しく劣るため、不適である。
リン酸塩は、1種単独で用いてもよく、2種以上を併用してもよい。2種以上を併用することで、得られる絶縁被膜の物性値を緻密に制御できる。
このようなリン酸塩としては、入手容易性の観点からは、第一リン酸塩(重リン酸塩)が好適に挙げられる。
コロイド状シリカの平均粒子径は、入手の容易性およびコストの観点から、5~200nmが好ましく、10~100nmがより好ましい。なお、コロイド状のシリカの平均粒子径は、BET法(吸着法による比表面積から換算)により測定できる。また、電子顕微鏡写真から実測した平均値で代用することも可能である。
コロイド状シリカの含有量が少なすぎると、絶縁被膜の熱膨張係数低減の効果が小さくなって、鋼板に付与される張力が低下する場合がある。一方、コロイド状シリカの含有量が多すぎると、後述する焼付に際して絶縁被膜の結晶化が進行しやすくなり、やはり、鋼板に付与される張力が低下する場合がある。
しかしながら、コロイド状シリカの含有量が上記範囲内であれば、絶縁被膜によって、鋼板に適度な張力が付与され、鉄損の改善効果に優れる。
また、本発明においては、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、Zr、MoおよびWからなる群から選ばれる少なくとも1種を「M」とした場合において、上記処理液は、さらに、M化合物を含有していてもよい。これにより、絶縁被膜が鋼板に付与する張力が向上して鉄損の改善効果に優れるほか、絶縁被膜の耐吸湿性にも優れる。
V化合物としては、例えば、NH4VO3、V2O5等が挙げられる。
Cr化合物としては、例えば、クロム酸化合物が挙げられ、その具体例としては、無水クロム酸(CrO3)、クロム酸塩、重クロム酸塩などが挙げられる。
Mn化合物としては、例えば、Mn(NO3)2、MnSO4、MnCO3等が挙げられる。
Fe化合物としては、例えば、(NH4)2Fe(SO4)2、Fe(NO3)3、FeSO4・7H2O、Fe2O3等が挙げられる。
Co化合物としては、例えば、Co(NO3)2、CoSO4等が挙げられる。
Ni化合物としては、例えば、Ni(NO3)2、NiSO4等が挙げられる。
Cu化合物としては、例えば、Cu(NO3)2、CuSO4・5H2O等が挙げられる。
Zn化合物としては、例えば、Zn(NO3)2、ZnSO4、ZnCO3等が挙げられる。
Zr化合物としては、例えば、Zr(SO4)2・4H2O、ZrO2等が挙げられる。
Mo化合物としては、例えば、MoS2、MoO2等が挙げられる。
W化合物としては、例えば、K2WO4、WO3等が挙げられる。
M化合物の含有量が少なすぎると、上記改善効果が十分に得られにくい場合がある。一方、M化合物の含有量が多すぎると、絶縁被膜として緻密なガラス質な被膜が得られにくくなり、鋼板に付与する張力が十分に向上しない場合がある。
しかしながら、M化合物の含有量が上記範囲内であれば、絶縁被膜による鉄損の改善効果がより優れる。
Ti:TiO2換算、V:V2O5換算、Cr:CrO3換算、Mn:MnO換算、Fe:FeO換算、Co:CoO換算、Ni:NiO換算、Cu:CuO換算、Zn:ZnO換算、Zr:ZrO2換算、Mo:MoO3換算、W:WO3換算
上述した処理液を方向性電磁鋼板の表面に塗布する方法としては、特に限定されず、従来公知の方法を用いることができる。
なお、処理液は、鋼板の両面に塗布するのが好ましく、焼付後の目付量が両面合計で4~15g/m2となるように塗布することがより好ましい。この量が少なすぎると層間抵抗が低下する場合があり、多すぎると占積率の低下が大きくなる場合があるからである。
焼付の昇温過程で水分は乾燥するので焼付前に乾燥を別途行わなくてもよいが、急な加熱による造膜不良を防止する観点、および、本願発明の特徴の1つでもある、焼付時の絶縁被膜を還元処理することでリン酸塩の結合状態を制御することを安定的に行なう観点から、焼付前に処理液を十分乾燥することが好ましく、焼付前に、処理液が塗布された方向性電磁鋼板の乾燥(仮焼付)を行なうことがより好ましい。
乾燥は、具体的には、例えば、処理液を塗布した鋼板を、乾燥炉に装入して、150~450℃で、10秒以上保持することが好ましい。
150℃未満および/または10秒未満では、乾燥が不十分となることで所望の結合状態が得られにくい場合があり、また、450℃よりも高い温度では乾燥時に鋼板が酸化してしまう場合があるが、150~450℃、10秒以上であれば、鋼板の酸化を抑制しつつ、十分に乾燥できる。
なお、乾燥時間は長いほど好ましいが、120秒よりも長いと生産性が低下しやすいため、120秒以下が好ましい。
次に、処理液の塗布後に乾燥した方向性電磁鋼板について、焼付を施し、これにより、絶縁被膜を形成する。
ところで、上述したように、耐熱性に優れる絶縁被膜とするためには、絶縁被膜のPのK吸収端のXAFSスペクトルが、2156eVから2180eVの間に3つの吸収ピークを示すことが必要である。そして、このような絶縁被膜を形成する方法は特に限定されないが、上述した構成を得るための方法の一例として、焼付に際しての条件を、特定の条件とすればよい。具体的には、1)焼付温度(以下「T」と表記)を高くし、2)焼付雰囲気中の水素濃度(以下「H2」と表記)を高くし、3)焼付温度Tでの焼付時間(以下「Time」と表記)を長くすればよい。
以下、各条件については、より詳細に説明する。
焼付温度T(単位:℃)は、850≦T≦1000とする。絶縁被膜のPのK吸収端のXAFSスペクトルが2156eVから2180eVの間に3つの吸収ピークを示すようにするためには、焼付温度(T)としては、850℃以上とすればよい。一方で、焼付温度(T)が高くなりすぎると、ガラス質主体の絶縁被膜の結晶化が過度に進行してしまい、鋼板に付与される張力が低下してしまうことから、1000℃以下とする。
焼付雰囲気中の水素濃度H2(単位:体積%)は、0.3≦H2≦230-0.2Tとする。絶縁被膜のPのK吸収端のXAFSスペクトルが2156eVから2180eVの間に3つの吸収ピークを示すようにするためには、水素濃度(H2)としては、0.3体積%以上とすればよい。一方で、水素濃度(H2)が高くなりすぎると、ガラス質主体の絶縁被膜の結晶化が過度に進行してしまう。その限界濃度は、焼付温度(T)と関係があり、H2≦230-0.2Tとする。
なお、焼付雰囲気において、水素以外の残部は、不活性ガスであることが好ましく、窒素であることがより好ましい。
焼付時間Time(単位:秒)としては、5≦Time≦860-0.8Tとする。絶縁被膜のPのK吸収端のXAFSスペクトルが2156eVから2180eVの間に3つの吸収ピークを示すようにするためには、焼付時間(Time)としては、焼付温度Tを5秒以上とすればよい。一方で、焼付時間(Time)が長くなりすぎると、やはり、絶縁被膜の結晶化が過度に進行してしまう。その限界時間は、焼付温度(T)と関係があり、Time≦860-0.8Tとする。
次に、本発明の製造方法の第2態様について説明する。
上述した第1態様では、耐熱性に優れる絶縁被膜として、PのK吸収端のXAFSスペクトルが2156eVから2180eVの間に3つの吸収ピークを示す絶縁被膜を形成するための特定の焼付条件を説明した。しかしながら、例えば、水素濃度H2等が不足していたりして第1態様の焼付条件を満たさない場合であっても、さらに、特定条件のプラズマ処理を施すことで、第1態様の場合と同様の絶縁被膜が得られる。
第2態様は、所望の性能が得られていない場合の救済処理としてプラズマ処理することを見出したものであり、焼付条件の許容範囲が第1態様よりも広くなっている。なお、本発明の製造方法の第1態様で得られた鋼板にさらにプラズマ処理しても良好な性能が損なわれることはない。
具体的には、焼付雰囲気中の水素濃度H2(単位:体積%)は、第1態様では、0.3≦H2≦230-0.2Tを満たすのに対して、第2態様では、0≦H2≦230-0.2Tであり、第1態様では所望の特性が得られなかった0≦H2<0.3の場合でも良好な性能を得ることが可能となる。
また、焼付温度T(単位:℃)も、第1態様の条件(850≦T≦1000)よりも広い範囲とすることが可能であり、第2態様では、800≦T≦1000である。さらに、焼付温度Tでの焼付時間Time(単位:秒)は、Time≦300であればよい。
上述したように、焼付条件が第1態様の条件を満たしていなくても、さらに、特定のプラズマ処理を施すことで、PのK吸収端のXAFSスペクトルが2156eVから2180eVの間に3つの吸収ピークを示し、耐熱性に優れる絶縁被膜が得られる。
具体的には、焼付後の方向性電磁鋼板の表面に、水素0.3体積%以上含むプラズマガスから発生させたプラズマを、0.10秒以上照射する。
そして、例えば、大気圧下、プラズマガス(作動ガス)中で、対向する電極間に高周波電圧を印加して放電させることにより、プラズマを発生させ、これを鋼板の表面に照射する。
一方、プラズマガス中の水素濃度の上限値は、特に限定されないが、50体積%以下が好ましく、10体積%以下がより好ましい。
なお、プラズマガス中の水素以外の残部のガスとしては、プラズマの生成が容易になるという理由から、ヘリウム、アルゴン等が好ましい。
なお、鋼板へ熱ひずみを与えないという観点から、プラズマのガス温度(出口温度)は、200℃以下が好ましく、150℃以下がより好ましい。
〔絶縁被膜付き方向性電磁鋼板の製造〕
板厚:0.23mmの仕上焼鈍済みの方向性電磁鋼板(磁束密度B8:1.912T)を準備し、この鋼板を100mm×300mmの大きさに切り出し、5質量%リン酸で酸洗した。その後、下記表1に記載のリン酸塩100質量部に対して、コロイド状シリカ(ADEKA社製AT-30、平均粒子径:10nm)50質量部と、TiO2 25質量部とを添加した処理液を、焼付後の目付量が両面合計で10g/m2となるように塗布した後、乾燥炉に装入して、300℃で1分間の乾燥を施し、その後、下記表1に記載の条件で焼付を行なった。これにより、各例の絶縁被膜付き方向性電磁鋼板を製造した。
なお、リン酸塩としては、いずれも第一リン酸塩水溶液を使用し、下記表1には、固形分換算した量を記載した。また、焼付雰囲気において、水素以外の残部は窒素とした。
各例において、下記式から、鉄損の変化量(ΔW)を求めた。結果を下記表1に示す。
△W=W17/50(C)-W17/50(R)
・W17/50(C):焼付した直後の鉄損
・W17/50(R):処理液を塗布する直前の鉄損(0.840W/kg)
各例の絶縁被膜付き方向性電磁鋼板の絶縁被膜について、KEK-PFの軟X線ビームラインBL-27Aにおいて、全電子収量法(TEY)にて、PのK吸収端のXAFS測定を実施し、得られたXAFSスペクトルについて、2156eVから2180eVの間に視認できた吸収ピークの本数を数えた。結果を下記表1に示す。
各例の絶縁被膜付き方向性電磁鋼板を、50mm×50mmの試験片にせん断し、これを10枚積層して、2kg/cm2の圧縮加重焼鈍を窒素雰囲気下、830℃で3時間行なった後、500gの分銅を20~120cmの高さから20cm間隔で落下させ、10枚の試験片が全て分離したときの分銅の高さ(落重高さ)により絶縁被膜の耐熱性を評価した。なお、圧縮加重焼鈍後、落重試験する前に10枚の試験片がすべて分離している場合は、0cmとした。40cm以下の落重高さで分離した場合には、その絶縁被膜は耐熱性に優れるものとして評価できる。結果を下記表1に示す。
各例の絶縁被膜付き方向性電磁鋼板について、JIS C 2550-5:2011に準拠して、占積率を測定した。その結果、いずれの例においても、絶縁被膜が酸化物微粒子等を含まないため、占積率は97.8%以上であり良好であった。
各例の絶縁被膜付き方向性電磁鋼板を、40℃、湿度100%の雰囲気下に50時間暴露した後の発錆率を測定した。その結果、いずれの例においても、発錆率は1%以下であり、耐食性は良好であった。
〔絶縁被膜付き方向性電磁鋼板の製造〕
板厚:0.23mmの仕上焼鈍済みの方向性電磁鋼板(磁束密度B8:1.912T)を準備し、この鋼板を100mm×300mmの大きさに切り出し、5質量%リン酸で酸洗した。その後、下記表2に記載のリン酸塩100質量部に対して、コロイド状シリカ(日産化学工業社製スノーテックス50、平均粒子径:30nm)を70質量部添加し、さらに、M化合物を下記表2に示す含有量(酸化物換算)で添加した処理液を、焼付後の目付量が両面合計で12g/m2となるように塗布した後、乾燥炉に装入して、300℃で1分間の乾燥を施し、その後、下記表2に記載の条件で焼付を行なった。これにより、各例の絶縁被膜付き方向性電磁鋼板を製造した。
なお、リン酸塩としては、いずれも第一リン酸塩水溶液を使用し、下記表2には、固形分換算した量を記載した。また、焼付雰囲気において、水素以外の残部は窒素とした。
・Ti:TiO2
・V:NH4VO3
・Cr:CrO3
・Mn:Mn(NO3)2
・Fe:FeSO4・7H2O
・Co:Co(NO3)2
・Ni:Ni(NO3)2
・Cu:CuSO4・5H2O
・Zn:ZnSO4
・Zr:ZrO2
・Mo:MoO2
・W:WO3
各例において、下記式から、鉄損の変化量(ΔW)を求めた。結果を下記表2に示す。
△W=W17/50(C)-W17/50(R)
・W17/50(C):焼付した直後の鉄損
・W17/50(R):処理液を塗布する直前の鉄損(0.840W/kg)
各例の絶縁被膜付き方向性電磁鋼板の絶縁被膜について、KEK-PFの軟X線ビームラインBL-27Aにおいて、全電子収量法(TEY)にて、PのK吸収端のXAFS測定を実施し、得られたXAFSスペクトルについて、2156eVから2180eVの間に視認できた吸収ピークの本数を数えた。結果を下記表2に示す。
各例の絶縁被膜付き方向性電磁鋼板を、50mm×50mmの試験片にせん断し、これを10枚積層して、2kg/cm2の圧縮加重焼鈍を窒素雰囲気下、830℃で3時間行なった後、500gの分銅を20~120cmの高さから20cm間隔で落下させ、10枚の試験片が全て分離したときの分銅の高さ(落重高さ)により絶縁被膜の耐熱性を評価した。なお、圧縮加重焼鈍後、落重試験する前に10枚の試験片がすべて分離している場合は、0cmとした。40cm以下の落重高さで分離した場合には、その絶縁被膜は耐熱性に優れるものとして評価できる。結果を下記表2に示す。
各例の絶縁被膜付き方向性電磁鋼板について、JIS C 2550-5:2011に準拠して、占積率を測定した。その結果、いずれの例においても、絶縁被膜が酸化物微粒子等を含まないため、占積率は97.7%以上であり良好であった。
各例の絶縁被膜付き方向性電磁鋼板を、40℃、湿度100%の雰囲気下に50時間暴露した後の発錆率を測定した。その結果、いずれの例においても、発錆率は1%以下であり、耐食性は良好であった。
板厚:0.23mmの仕上焼鈍済みの方向性電磁鋼板(磁束密度B8:1.912T)を準備した。この鋼板を100mm×300mmの大きさに切り出し、5質量%リン酸で酸洗した。その後、下記表3に記載のリン酸塩100質量部に対して、コロイド状シリカ(ADEKA社製AT-50、平均粒子径:23nm)75質量部と、酸化鉄ゾルをFeO換算で50質量部とを添加した処理液を、焼付後の目付量が両面合計で9g/m2となるように塗布した後、乾燥炉に装入して、300℃で1分間の乾燥を施し、その後、下記表3に記載の条件で焼付およびプラズマ処理を行なった。これにより、各例の絶縁被膜付き方向性電磁鋼板を製造した。
なお、リン酸塩としては、いずれも第一リン酸塩水溶液を使用し、下記表3には、固形分換算した量を記載した。また、焼付雰囲気において、水素以外の残部は窒素とした。
プラズマ処理では、大気圧プラズマを鋼板に照射した。大気圧プラズマ装置としては、プラズマファクトリー社製PF-DFLを使用し、プラズマヘッドとしては、幅およそ300mmのリニア型プラズマヘッドを用いた。
プラズマガス(作動ガス)のガス種は、Ar、Ar-N2、または、Ar-H2であり、その流量は合計で、30L/minとした。
プラズマの幅は3mmとした。プラズマヘッドを固定して鋼板の搬送速度を変えることで、照射時間を変更して、鋼板の全面に均一にプラズマ処理を行なった。照射時間は、プラズマの幅(3mm)を搬送速度(単位:mm/秒)で除することにより算出した。
各例において、下記式から、鉄損の変化量(ΔW)を求めた。結果を下記表3に示す。
△W=W17/50(P)-W17/50(R)
・W17/50(P):プラズマ処理直後の鉄損
・W17/50(R):処理液を塗布する直前の鉄損(0.840W/kg)
各例の絶縁被膜付き方向性電磁鋼板の絶縁被膜について、立命館大学SrセンターのビームラインBL-10またはBL-13において、全電子収量法(TEY)にて、PのK吸収端のXAFS測定を実施し、得られたXAFSスペクトルについて、2156eVから2180eVの間に視認できた吸収ピークの本数を数えた。
なお、各例ともに、プラズマ照射の前後で測定を行なった。結果を下記表3に示す。
各例の絶縁被膜付き方向性電磁鋼板を、50mm×50mmの試験片にせん断し、これを10枚積層して、2kg/cm2の圧縮加重焼鈍を窒素雰囲気下、830℃で3時間行なった後、500gの分銅を20~120cmの高さから20cm間隔で落下させ、10枚の試験片が全て分離したときの分銅の高さ(落重高さ)により絶縁被膜の耐熱性を評価した。なお、圧縮加重焼鈍後、落重試験する前に10枚の試験片がすべて分離している場合は、0cmとした。40cm以下の落重高さで分離した場合には、その絶縁被膜は耐熱性に優れるものとして評価できる。結果を下記表3に示す。
各例の絶縁被膜付き方向性電磁鋼板について、JIS C 2550-5:2011に準拠して、占積率を測定した。その結果、いずれの例においても、絶縁被膜が酸化物微粒子等を含まないため、占積率は97.9%以上であり良好であった。
各例の絶縁被膜付き方向性電磁鋼板を、40℃、湿度100%の雰囲気下に50時間暴露した後の発錆率を測定した。その結果、いずれの例においても、発錆率は1%以下であり、耐食性は良好であった。
板厚:0.23mmの仕上焼鈍済みの方向性電磁鋼板(磁束密度B8:1.912T)を準備した。この鋼板を100mm×300mmの大きさに切り出し、5質量%リン酸で酸洗した。その後、下記表4に記載のリン酸塩100質量部に対して、コロイド状シリカ(日産化学工業社製、スノーテックス30、平均粒子径:15nm)を55質量部添加し、さらに、M化合物を下記表4に示す含有量(酸化物換算)で添加した処理液を、焼付後の目付量が両面合計で14g/m2となるように塗布した後、乾燥炉に装入して、300℃で1分間の乾燥を施し、その後、下記表4に記載の条件で焼付およびプラズマ処理を行なった。これにより、各例の絶縁被膜付き方向性電磁鋼板を製造した。
なお、リン酸塩としては、いずれも第一リン酸塩水溶液を使用し、下記表4には、固形分換算した量を記載した。また、焼付雰囲気において、水素以外の残部は窒素とした。
・Ti:TiO2
・V:V2O5
・Cr:CrO3
・Mn:MnCO3
・Fe:Fe2O3
・Co:CoSO4
・Ni:NiSO4
・Cu:Cu(NO3)2
・Zn:ZnCO3
・Zr:Zr(SO4)2・4H2O
・Mo:MoS2
・W:K2WO4
プラズマ処理では、大気圧プラズマを鋼板に照射した。大気圧プラズマ装置としては、プラズマファクトリー社製PF-DFLを使用し、プラズマヘッドとしては、幅およそ300mmのリニア型プラズマヘッドを用いた。
プラズマガス(作動ガス)のガス種は、Ar、Ar-N2、または、Ar-H2であり、その流量は合計で、30L/minとした。
プラズマの幅は3mmとした。プラズマヘッドを固定して鋼板の搬送速度を変えることで、照射時間を変更して、鋼板の全面に均一にプラズマ処理を行なった。照射時間は、プラズマの幅(3mm)を搬送速度(単位:mm/秒)で除することにより算出した。
各例において、下記式から、鉄損の変化量(ΔW)を求めた。結果を下記表4に示す。
△W=W17/50(P)-W17/50(R)
・W17/50(P):プラズマ処理直後の鉄損
・W17/50(R):処理液を塗布する直前の鉄損(0.840W/kg)
各例の絶縁被膜付き方向性電磁鋼板の絶縁被膜について、立命館大学SrセンターのビームラインBL-10またはBL-13において、全電子収量法(TEY)にて、PのK吸収端のXAFS測定を実施し、得られたXAFSスペクトルについて、2156eVから2180eVの間に視認できた吸収ピークの本数を数えた。
なお、各例ともに、プラズマ照射の前後で測定を行なった。結果を下記表4に示す。
各例の絶縁被膜付き方向性電磁鋼板を、50mm×50mmの試験片にせん断し、これを10枚積層して、2kg/cm2の圧縮加重焼鈍を窒素雰囲気下、830℃で3時間行なった後、500gの分銅を20~120cmの高さから20cm間隔で落下させ、10枚の試験片が全て分離したときの分銅の高さ(落重高さ)により絶縁被膜の耐熱性を評価した。なお、圧縮加重焼鈍後、落重試験する前に10枚の試験片がすべて分離している場合は、0cmとした。40cm以下の落重高さで分離した場合には、その絶縁被膜は耐熱性に優れるものとして評価できる。結果を下記表4に示す。
各例の絶縁被膜付き方向性電磁鋼板について、JIS C 2550-5:2011に準拠して、占積率を測定した。その結果、いずれの例においても、絶縁被膜が酸化物微粒子等を含まないため、占積率は97.7%以上であり良好であった。
各例の絶縁被膜付き方向性電磁鋼板を、40℃、湿度100%の雰囲気下に50時間暴露した後の発錆率を測定した。その結果、いずれの例においても、発錆率は1%以下であり、耐食性は良好であった。
Claims (6)
- 方向性電磁鋼板と、前記方向性電磁鋼板の表面上に配置された絶縁被膜とを有し、
前記絶縁被膜が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種と、Si、PおよびOとを含有し、
前記絶縁被膜のPのK吸収端のXAFSスペクトルが、2156eVから2180eVの間に3つの吸収ピークを示す、絶縁被膜付き方向性電磁鋼板。 - 仕上焼鈍済みの方向性電磁鋼板の表面に、処理液を塗布した後に、焼付を施し、請求項1に記載の絶縁被膜付き方向性電磁鋼板を得る、絶縁被膜付き方向性電磁鋼板の製造方法であって、
前記処理液が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種のリン酸塩と、コロイド状シリカと、を含有し、
前記処理液中の前記コロイド状シリカの含有量が、前記リン酸塩の固形分合計100質量部に対して、固形分換算で、50~150質量部であり、
前記焼付の条件として、焼付温度T(単位:℃)が850≦T≦1000、焼付雰囲気中の水素濃度H2(単位:体積%)が0.3≦H2≦230-0.2T、焼付温度Tでの焼付時間Time(単位:秒)が5≦Time≦860-0.8Tを満たす、絶縁被膜付き方向性電磁鋼板の製造方法。 - 前記処理液を塗布した前記仕上焼鈍済みの方向性電磁鋼板を、150~450℃の温度で10秒以上保持した後、前記焼付を施す、請求項2に記載の絶縁被膜付き方向性電磁鋼板の製造方法。
- 仕上焼鈍済みの方向性電磁鋼板の表面に、処理液を塗布した後に、焼付およびプラズマ処理をこの順で施し、請求項1に記載の絶縁被膜付き方向性電磁鋼板を得る、絶縁被膜付き方向性電磁鋼板の製造方法であって、
前記処理液が、Mg、Ca、Ba、Sr、Zn、AlおよびMnからなる群から選ばれる少なくとも1種のリン酸塩と、コロイド状シリカと、を含有し、
前記処理液中の前記コロイド状シリカの含有量が、前記リン酸塩の固形分合計100質量部に対して、固形分換算で、50~150質量部であり、
前記焼付の条件として、焼付温度T(単位:℃)が800≦T≦1000、焼付雰囲気中の水素濃度H2(単位:体積%)が0≦H2≦230-0.2T、焼付温度Tでの焼付時間Time(単位:秒)がTime≦300を満たし、
前記プラズマ処理は、前記焼付後の前記方向性電磁鋼板の表面に、水素0.3体積%以上含むプラズマガスから発生させたプラズマを0.10秒以上照射する処理である、絶縁被膜付き方向性電磁鋼板の製造方法。 - 前記処理液を塗布した前記仕上焼鈍済みの方向性電磁鋼板を、150~450℃の温度で10秒以上保持した後、前記焼付および前記プラズマ処理を施す、請求項4に記載の絶縁被膜付き方向性電磁鋼板の製造方法。
- Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、Zr、MoおよびWからなる群から選ばれる少なくとも1種を、Mとした場合において、
前記処理液が、さらに、M化合物を含有し、
前記処理液中の前記M化合物の含有量が、前記リン酸塩の固形分合計100質量部に対して、酸化物換算で、5~150質量部である、請求項2~5のいずれか1項に記載の絶縁被膜付き方向性電磁鋼板の製造方法。
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BR112017020757B1 (pt) | 2022-11-01 |
KR102007107B1 (ko) | 2019-08-02 |
US20180080127A1 (en) | 2018-03-22 |
JP6332453B2 (ja) | 2018-05-30 |
US10920323B2 (en) | 2021-02-16 |
CN107429401B (zh) | 2020-03-06 |
CN107429401A (zh) | 2017-12-01 |
EP3276043B1 (en) | 2021-12-15 |
BR112017020757A2 (ja) | 2018-06-26 |
JPWO2016158325A1 (ja) | 2017-04-27 |
EP3276043A4 (en) | 2018-04-04 |
RU2675887C1 (ru) | 2018-12-25 |
EP3276043A1 (en) | 2018-01-31 |
KR20170116130A (ko) | 2017-10-18 |
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