WO2017169851A1 - 焼鈍分離剤用酸化マグネシウム及び方向性電磁鋼板 - Google Patents
焼鈍分離剤用酸化マグネシウム及び方向性電磁鋼板 Download PDFInfo
- Publication number
- WO2017169851A1 WO2017169851A1 PCT/JP2017/010688 JP2017010688W WO2017169851A1 WO 2017169851 A1 WO2017169851 A1 WO 2017169851A1 JP 2017010688 W JP2017010688 W JP 2017010688W WO 2017169851 A1 WO2017169851 A1 WO 2017169851A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnesium oxide
- surface area
- specific surface
- magnesium
- steel sheet
- Prior art date
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 214
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 211
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 211
- 238000000137 annealing Methods 0.000 title claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 229910052839 forsterite Inorganic materials 0.000 claims description 61
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 61
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims description 28
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 26
- 229910052796 boron Inorganic materials 0.000 claims description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 239000000460 chlorine Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 229910052801 chlorine Inorganic materials 0.000 claims description 12
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- 235000012239 silicon dioxide Nutrition 0.000 claims description 11
- 238000009413 insulation Methods 0.000 abstract description 5
- 235000012245 magnesium oxide Nutrition 0.000 description 207
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 68
- 239000000347 magnesium hydroxide Substances 0.000 description 68
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 68
- 239000002245 particle Substances 0.000 description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 45
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 39
- 238000006243 chemical reaction Methods 0.000 description 36
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 32
- 239000000843 powder Substances 0.000 description 27
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 25
- 239000000920 calcium hydroxide Substances 0.000 description 25
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 25
- 238000000576 coating method Methods 0.000 description 25
- 230000015572 biosynthetic process Effects 0.000 description 23
- 239000011248 coating agent Substances 0.000 description 23
- 239000002002 slurry Substances 0.000 description 23
- 239000007864 aqueous solution Substances 0.000 description 22
- 239000002253 acid Substances 0.000 description 21
- 238000005755 formation reaction Methods 0.000 description 17
- 238000003756 stirring Methods 0.000 description 17
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 16
- 239000004327 boric acid Substances 0.000 description 16
- 229910001629 magnesium chloride Inorganic materials 0.000 description 16
- 238000000034 method Methods 0.000 description 16
- 239000000203 mixture Substances 0.000 description 16
- 239000000243 solution Substances 0.000 description 16
- 239000003153 chemical reaction reagent Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 14
- 230000000694 effects Effects 0.000 description 14
- 230000009257 reactivity Effects 0.000 description 14
- 239000011575 calcium Substances 0.000 description 12
- 239000011164 primary particle Substances 0.000 description 12
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 11
- 229910000976 Electrical steel Inorganic materials 0.000 description 9
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 9
- 229910001425 magnesium ion Inorganic materials 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 8
- -1 SO 3 Inorganic materials 0.000 description 7
- 239000011259 mixed solution Substances 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 229910052731 fluorine Inorganic materials 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 238000003746 solid phase reaction Methods 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004438 BET method Methods 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 229910004283 SiO 4 Inorganic materials 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 210000004556 brain Anatomy 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 239000012043 crude product Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052915 alkaline earth metal silicate Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- YWCYJWYNSHTONE-UHFFFAOYSA-O oxido(oxonio)boron Chemical compound [OH2+][B][O-] YWCYJWYNSHTONE-UHFFFAOYSA-O 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 description 1
Classifications
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- 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
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
- C01F5/06—Magnesia by thermal decomposition of magnesium compounds
- C01F5/08—Magnesia by thermal decomposition of magnesium compounds by calcining magnesium hydroxide
-
- 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
- C21D1/26—Methods of annealing
-
- 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
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- 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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
-
- 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
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
-
- 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
- C21D8/1288—Application of a tension-inducing coating
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/16—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for explosive shells
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
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Definitions
- the present invention relates to magnesium oxide and grain-oriented electrical steel sheet for annealing separators.
- Oriented electrical steel sheets used for transformers and generators are generally hot-rolled silicon steel containing about 3% of silicon (Si), then cold-rolled to the final thickness, and then decarburized and annealed. It is manufactured by finish annealing.
- decarburization annealing primary recrystallization annealing
- a silicon dioxide film is formed on the surface of the steel sheet, a slurry containing magnesium oxide for annealing separator is applied on the surface, dried, wound into a coil, and then annealed in a finish.
- silicon dioxide (SiO 2 ) and magnesium oxide (MgO) react to form a forsterite (Mg 2 SiO 4 ) coating on the steel sheet surface.
- This forsterite film plays a role of adding tension to the steel sheet surface, reducing iron loss and improving magnetic properties, and imparting insulation to the steel sheet.
- Patent Document 1 discloses magnesium oxide for an annealing separator that specifies the contents of CaO and B.
- Patent Document 2 discloses magnesium oxide for an annealing separator that specifies the contents of chlorides such as Mg and Ca and the B ratio for them.
- Patent Document 3 and Patent Document 4 disclose magnesium oxide for annealing separators in which the contents of CaO, SO 3 , halogen, and B in the magnesium oxide for annealing separators are specified.
- magnesium oxide for annealing separators that has specified other physical properties has been studied. For example, in Patent Document 5, many physical property values including CaO, CO 2 , SO 3 , K, Na, B, and the like have been studied.
- a magnesium oxide for controlled annealing separator is disclosed.
- Patent Document 6 discloses a method for producing a grain-oriented electrical steel sheet using magnesium oxide in which Cl content and SO 3 content are specified.
- Patent Document 7 discloses an annealing separator for grain-oriented electrical steel sheets that specifies the contents of F and Cl and various physical properties.
- CAA citric acid activity
- an indicator phenolphthalein is mixed in a 0.4N citric acid aqueous solution at a predetermined temperature (for example, 303K), the final reaction equivalent of magnesium oxide is added and stirred, and the citric acid aqueous solution becomes neutral. It is expressed in the time until. It is empirically known that CAA can be an evaluation index for magnesium oxide used as an annealing separator for grain-oriented electrical steel sheets.
- Patent Document 8 describes the activity to control CAA within a narrow range in each of the final reaction rates of 20%, 40%, 60% and 70%.
- An invention of a magnesium oxide for an annealing separator having an adjusted amount is disclosed.
- Patent Document 9 and Patent Document 10 disclose inventions of magnesium oxide for annealing separators in which the activity, particle diameter, specific surface area, and the like of CAA 40% and CAA 80% are limited to predetermined values, respectively.
- Patent Document 11 discloses an invention of an annealing separator for grain-oriented electrical steel sheets in which CAA 70%, the ratio of CAA 70% and CAA 40%, particle diameter, specific surface area, etc. are limited to predetermined values, respectively. Yes. In any of these inventions, the hydration and reactivity of the magnesium oxide particles are controlled.
- the magnetic and insulating properties and market value of grain-oriented electrical steel sheets are the performance of forsterite coating, specifically, (a) ease of formation of forsterite coating (forsterite coating formation rate), (b) coating (C) adhesion of the coating, and (d) acid removal of unreacted magnesium oxide.
- the properties and values of grain-oriented electrical steel sheets depend on the performance of magnesium oxide for an annealing separator for forming a forsterite film.
- magnesium oxide for annealing separators has not completely prevented the occurrence of coating failure on the grain-oriented electrical steel sheet and lacks reliability because a certain effect cannot be obtained. Therefore, magnesium oxide for annealing separators having sufficient performance has not yet been found.
- Patent Documents 1 to 5 describe attempts to examine the structure of a compound containing a trace component element in magnesium oxide for an annealing separator.
- the magnesium oxide for annealing separator described in these documents is used, the adhesion of the obtained forsterite film or the acid removal property of unreacted magnesium oxide is poor.
- the magnesium oxide for annealing separators described in Patent Documents 6 and 7 was obtained by paying attention to the effect of promoting the formation of a forsterite film of halogen, particularly F. Although the magnesium oxide described in these documents is effective for forming a constant forsterite film, the effect is not yet sufficient.
- the activity of magnesium oxide using CAA as an index evaluates the reactivity of the solid-liquid phase reaction between magnesium oxide and citric acid.
- the surface free energy increases and the activity increases as the number of reaction sites in the solid phase increases, that is, as the particle diameter of magnesium oxide decreases and as the specific surface area increases.
- powder particles such as magnesium oxide exist not only in the case where the powder particles exist as unit particles depending on the production method, but also in the form of a particle aggregate in which several powder particles are aggregated and bonded. There are many things.
- the measured value of CAA is not a value that reflects the structure of the particle aggregate. Therefore, the reactivity of the annealing separator cannot be expressed correctly only by CAA.
- CAA empirically simulates the reactivity of the solid-solid phase reaction between silicon dioxide and magnesium oxide that occurs on the surface of an actual electrical steel sheet by the solid-liquid phase reaction between magnesium oxide and citric acid. I'm just doing it.
- the forsterite formation reaction which is a solid-solid phase reaction
- the aggregation structure of magnesium oxide particles represented by the number of contacts between the silicon dioxide film and the magnesium oxide particles is It can be considered to have a big influence. That is, even if the magnesium oxide particles have an active surface, the reaction becomes insufficient if the number of contacts affected by the particle aggregation structure is small. On the other hand, even with magnesium oxide particles having an inert surface, a sufficient reaction can be performed by increasing the number of contacts.
- CAA which has been used as an index representing the properties of the annealing separator for electrical steel sheets, is an index that can evaluate the reactivity of magnesium oxide only under certain conditions.
- Magnesium oxide with a suitable particle aggregation structure may be found.
- magnesium oxide which has been considered to have good activity according to the CAA index, is superior in magnetic properties and insulating properties. There is a possibility that magnesium oxide capable of obtaining the oriented magnetic steel sheet can be selected.
- an object of the present invention is to provide magnesium oxide for an annealing separator for obtaining a grain-oriented electrical steel sheet having excellent magnetic properties and insulating properties. Specifically, for an annealing separator that can form a forsterite film excellent in forsterite film formation rate, film appearance, film adhesion, and acid removal of unreacted magnesium oxide on the surface of the steel sheet. An object is to provide magnesium oxide.
- the present inventors have found that a grain-oriented electrical steel sheet having excellent magnetic properties and insulation properties can be obtained by setting the BET specific surface area and the brane specific surface area of magnesium oxide for annealing separators within a predetermined range. Invented.
- the present invention has a BET specific surface area of 12.0 ⁇ 10 3 to 25.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and a Blaine specific surface area of 2.0 ⁇ 10 3 to 7.0 ⁇ 10 3 m 2 ⁇ kg. -1, which is magnesium oxide for annealing separator.
- the BET specific surface area corresponds to the specific surface area including the surface area of the primary particles constituting the aggregated particles.
- the Blaine specific surface area corresponds to the specific surface area of only the aggregated particles excluding the surface area of the primary particles constituting the aggregated particles. Therefore, the structures of the primary particles and the agglomerated particles can be controlled by setting the BET specific surface area and the brane specific surface area within a predetermined range.
- the magnesium oxide for annealing separator of the present invention the solid-solid reaction between the magnesium oxide and the silicon dioxide coating on the surface can be appropriately controlled by controlling the structure of the primary particles and the aggregated particles. Therefore, the grain-oriented electrical steel sheet excellent in magnetic characteristics and insulation characteristics can be obtained by using magnesium oxide for annealing separator. Specifically, a forsterite film excellent in forsterite film formation rate, film appearance, film adhesion, and acid removal property of unreacted magnesium oxide can be formed on the surface of the steel sheet.
- the magnesium oxide for annealing separator of the present invention preferably contains 0.04 to 0.15% by mass of boron and has a chlorine content of 0.05% by mass or less. When the content of boron and chlorine is within a predetermined range, magnesium oxide for annealing separator for obtaining a grain-oriented electrical steel sheet having excellent magnetic properties and insulating properties can be obtained more reliably.
- the present invention is an annealing separator containing the above-described magnesium oxide for annealing separator.
- a grain-oriented electrical steel sheet having excellent magnetic properties and insulating properties can be produced.
- the present invention includes a step of forming a silicon dioxide film on the surface of the steel sheet, and a step of forming a forsterite film on the surface of the steel sheet by applying the annealing separator described above to the surface of the silicon dioxide film and annealing. It is a manufacturing method of a grain-oriented electrical steel sheet. With the production method of the present invention, a grain-oriented electrical steel sheet having excellent magnetic properties and insulation properties can be produced.
- magnesium oxide for an annealing separator for obtaining a grain-oriented electrical steel sheet having excellent magnetic properties and insulating properties can be provided.
- a forsterite film having excellent forsterite film production rate, film appearance, film adhesion, and acid removal property of unreacted magnesium oxide is formed on the surface of the steel sheet. It is possible to provide magnesium oxide for an annealing separator that can be used.
- the magnesium oxide for annealing separator of the present invention has a BET specific surface area of 12.0 ⁇ 10 3 to 25.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and a Blaine specific surface area of 2.0 ⁇ 10 3 to 7.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- the BET specific surface area is a specific surface area measured by a nitrogen gas adsorption method (BET method).
- the specific surface area of the brain is a specific surface area measured by the brain method described in “8.1 Specific surface area test” of JIS R5201: 2015.
- the specific surface area is measured by allowing air to pass through the powder packed bed, it is impossible to measure the surface area of fine pores in which the internal air is not replaced by the air flow. For this reason, according to the brane method, the specific surface area (brane specific surface area) of only the aggregated particles excluding the surface area of the primary particles constituting the aggregated particles can be measured.
- BET specific surface area fine pores in the aggregated particles can be measured, and therefore the specific surface area including the surface area of the primary particles constituting the aggregated particles (BET specific surface area) can be measured.
- the BET specific surface area of magnesium oxide is preferably 12.0 ⁇ 10 3 to 23.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 , more preferably 14.0 ⁇ 10 3 to 20.0 ⁇ 10 3 m 2. -Kg -1 .
- the Blaine specific surface area of magnesium oxide is less than 2.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 , the aggregated particles of magnesium oxide become coarse, and the contact ratio between the magnesium oxide aggregated particles and the steel sheet decreases. The reactivity becomes worse, and (a) the forsterite film formation rate decreases. In addition, since the forsterite film containing coarse magnesium oxide aggregated particles is formed, the thickness becomes non-uniform. Therefore, the (b) film appearance and / or (c) adhesion of the forsterite film of the grain-oriented electrical steel sheet is deteriorated.
- the specific surface area of the branes of magnesium oxide is preferably 2.5 ⁇ 10 3 to 6.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 , more preferably 3.0 ⁇ 10 3 to 5.0 ⁇ 10 3 m 2. -Kg -1 .
- the magnesium oxide of the present invention by controlling the BET specific surface area and the brane specific surface area of the magnesium oxide aggregate particles, a high forsterite film forming ability that has not been obtained with conventional magnesium oxide for annealing separators. Can be achieved with high reliability.
- the high forsterite film forming ability is high forsterite film formation rate in production of grain-oriented electrical steel sheet, good film appearance, high film adhesion, and acid removal of unreacted magnesium oxide. It is indicated by good quality.
- magnesium oxide for annealing separator of the present invention is used, a grain-oriented electrical steel sheet having excellent insulating properties and magnetic properties can be produced.
- magnesium oxide In the present invention, a known method can be used for producing magnesium oxide.
- magnesium chloride is used as a raw material, and calcium hydroxide is added to this aqueous solution in a slurry state and reacted to form magnesium hydroxide.
- this magnesium hydroxide can be filtered, washed with water, dried and then fired in a heating furnace to form magnesium oxide, which can be pulverized to a desired particle size.
- magnesium oxide containing aqueous solution such as seawater, irrigation, bitter juice, etc. is introduced into the reactor, and magnesium oxide is produced by the Aman process in which magnesium oxide and HCl are directly produced at 1773-2273K.
- the particle size and specific surface area can be pulverized to produce magnesium oxide.
- magnesium oxide obtained by firing mineral magnesite can be hydrated, and the resulting magnesium hydroxide can be fired and ground to a desired particle size and specific surface area to produce magnesium oxide. it can.
- the BET specific surface area and the brane specific surface area of magnesium oxide can be adjusted by the following method. That is, by adjusting the reaction temperature and the concentration of the alkali source during the production process of magnesium hydroxide, the primary particle diameter and secondary particle diameter of magnesium hydroxide are controlled, and the BET specific surface area and brane specific surface area of magnesium oxide are controlled. Can be adjusted. Moreover, the BET specific surface area and the brane specific surface area of magnesium oxide can also be adjusted by controlling the firing temperature and time of magnesium hydroxide whose particle diameter is controlled.
- the BET specific surface area and the brane specific surface area after pulverization can be measured and adjusted by performing baking a plurality of times.
- calcined magnesium oxide can be used for jaw crusher, gyratory crusher, cone crusher, impact crusher, roll crusher, cutter mill, stamp mill, ring mill, roller mill, jet mill, hammer mill, rotary mill, vibration mill, planetary mill.
- the BET specific surface area and the brane specific surface area of magnesium oxide can be adjusted by pulverization using a pulverizer such as a ball mill.
- the BET specific surface area and the brane specific surface area of magnesium oxide can be adjusted even if a classifier is used.
- the optimum conditions of the pulverizer for obtaining the specific surface area of magnesium oxide within the range of the present invention vary depending on the type and capacity (power) of the pulverizer to be used. When weakened, the BET specific surface area and the brane specific surface area decrease. Although it is not always necessary to use a classifier together, a wider range of control becomes possible by using it together.
- the BET specific surface area and the Blaine specific surface area of the magnesium oxide obtained by the above method are measured, and those having an excess BET specific surface area and / or Blaine specific surface area are combined with those lacking and mixed. Also, the BET specific surface area and the brane specific surface area of magnesium oxide can be adjusted.
- a trace component is added in a wet manner, for example, using an aqueous solution of magnesium chloride analyzed in advance for the amount of trace content as a raw material.
- an alkaline aqueous solution or slurry having a hydroxyl group to the aqueous solution and reacting it to form magnesium hydroxide, it can be adjusted and added so that a trace amount of the content becomes a predetermined amount.
- calcium oxides, hydroxides, carbonates, nitrates, sulfates, silicates and phosphates can be used.
- phosphorus (P) When phosphorus (P) is added, phosphoric acid, metaphosphoric acid, phosphonic acid and phosphorous acid, their alkali metal salts, alkaline earth metal salts, and ammonium salt systems can be used.
- boron (B) boric acid, alkali metal borate, ammonium borate and alkali metal metaborate, boron dioxide and the like can be used.
- sulfur (S) sulfuric acid and sulfurous acid, their alkali metal salts, alkaline earth metal salts, and ammonium salt systems can be used.
- fluorine (F) magnesium fluoride or the like can be used.
- chlorine (Cl) magnesium chloride or the like can be used.
- silicon (Si) When silicon (Si) is added, alkali metal silicates, alkaline earth metal silicates and colloidal silica systems can be used.
- Magnesium oxide of the present invention can contain, for example, trace contents such as calcium (Ca), phosphorus (P), boron (B), sulfur (S), fluorine (F), and chlorine (Cl).
- the calcium content is preferably 0.2 to 2.0% by mass in terms of CaO.
- the magnesium oxide of the present invention contains phosphorus (P)
- the phosphorus content is preferably 0.03 to 0.15% by mass in terms of P 2 O 3 .
- the magnesium oxide of the present invention contains boron (B)
- the boron content is preferably 0.04 to 0.15% by mass.
- sulfur (S) the sulfur content is preferably 0.01 to 1.5% by mass in terms of SO 3 .
- magnesium oxide of this invention contains a fluorine (F), it is preferable that content of a fluorine is 0.05 mass% or less.
- content of a fluorine is 0.05 mass% or less.
- the magnesium oxide of the present invention contains chlorine (Cl), the chlorine content is preferably 0.05% by mass or less.
- the magnesium oxide of the present invention contains silicon (Si), the silicon content is preferably 0.05 to 0.5% by mass.
- “mass%” has the same meaning as “weight%”.
- magnesium hydroxide formation step acid is added or removed, or the magnesium hydroxide formation is performed. After the step, it can be removed by filtration and repeated washing with water.
- magnesium hydroxide can be washed with water to remove a trace amount of content, for example, chlorine (Cl) can be removed.
- a magnesium chloride-containing aqueous solution is reacted with an alkaline aqueous solution having a hydroxyl group, a part of magnesium hydroxide is reacted and precipitated in advance, and a small amount of, for example, boron (B) is adsorbed and removed on the precipitated particles. can do.
- the amount of trace content can be controlled before final firing of the obtained magnesium hydroxide or the like.
- the magnesium oxide of the present invention preferably has a citric acid activity (Citric Acid Activity, CAA) of 50 to 170 seconds, and more preferably 60 to 90 seconds.
- the citric acid activity (CAA) is the time to the final reaction when 40% of the final reaction equivalent of magnesium oxide is administered and stirred in a 0.4N citric acid aqueous solution at a temperature of 303K, that is, It means the time until citric acid is consumed and the solution becomes neutral.
- the reactivity of the solid-solid reaction between silicon dioxide and magnesium oxide that occurs on the surface of the actual electrical steel sheet is empirically simulated by the solid-liquid phase reaction, and includes primary particles. The reactivity of the magnesium oxide particles can be measured.
- the CAA of magnesium oxide is larger than 170 seconds, the primary particle diameter of magnesium oxide becomes coarse and the reactivity of the magnesium oxide particles becomes poor, and (a) the forsterite film formation rate decreases. Further, since the particles are coarse, a residue remains when removed with an acid, and (d) acid removability is poor.
- the CAA of magnesium oxide is less than 50 seconds, the primary particle diameter of magnesium oxide becomes small, and the reactivity of magnesium oxide particles becomes too fast. Therefore, a uniform forsterite film cannot be formed, and (b) film appearance and / or (c) adhesion of the forsterite film is deteriorated.
- the grain-oriented electrical steel sheet of the present invention can be manufactured by the following method.
- Steel sheets for grain-oriented electrical steel sheets are hot-rolled silicon steel slabs containing 2.5% to 4.5% silicon (Si), pickled and then cold-rolled, or sandwiched intermediately. It can be manufactured by performing cold rolling twice and adjusting to a predetermined plate thickness.
- the coil obtained by cold rolling the steel sheet is subjected to recrystallization annealing also serving as decarburization in a wet hydrogen atmosphere of 923 to 1173K. At this time, an oxide film mainly composed of silicon dioxide is formed on the surface of the steel sheet.
- the annealing separator containing magnesium oxide for annealing separator of the present invention is uniformly dispersed in water to obtain a slurry.
- This slurry is continuously applied on a steel plate having an oxide film formed on the surface by roll coating or spraying, and dried at about 573K.
- the steel plate thus treated is subjected to final finishing annealing at 1473 K for 20.0 hours, for example, to form a forsterite coating (Mg 2 SiO 4 coating) on the steel plate surface.
- the forsterite film is an insulating film, and can impart tension to the steel sheet surface to reduce the iron loss value of the grain-oriented electrical steel sheet and improve the magnetic properties.
- BET specific surface area was measured by a gas adsorption method (BET method) using nitrogen gas using a specific surface area measuring device (Macsorb, manufactured by Mountaintech Co., Ltd.).
- Chlorine (Cl) content measurement method Regarding the chlorine (Cl) content, after dissolving the sample in acid, the mass is measured using a spectrophotometer (UV-2550, manufactured by Shimadzu Corporation). Thus, the concentration in the sample was calculated.
- Forsterite film formation rate The formation mechanism of forsterite is represented by the reaction formula: 2MgO + SiO 2 ⁇ Mg 2 SiO 4 . Therefore, a mixture was prepared in which the molar ratio of magnesium oxide powder and amorphous silicon dioxide was adjusted to 2: 1, and 0.8 ⁇ 10 ⁇ 3 kg of this mixture was molded at a pressure of 50 MPa, and the diameter was 15 A molded product having a size of ⁇ 10 ⁇ 3 m and a height of about 3 ⁇ 10 ⁇ 3 m was obtained. Next, this compact was fired at 1473 K for 4.0 hours in a nitrogen atmosphere, and the amount of forsterite produced in the resulting sintered compact was quantitatively analyzed by X-ray diffraction. When the production rate is 90% or more, it is considered that a good forsterite film is formed with sufficient reactivity.
- Appearance of forsterite film Silicon steel slab for grain-oriented electrical steel sheet is known as a test sample test steel for appearance of forsterite film, adhesion of forsterite film and acid removal of unreacted magnesium oxide.
- a steel sheet that was hot-rolled and cold-rolled by a method to a final sheet thickness of 0.28 ⁇ 10 ⁇ 3 m and decarburized and annealed in a humid atmosphere of nitrogen 25% + hydrogen 75% was used.
- the composition of the steel sheet before decarburization annealing is mass%, C: 0.01%, Si: 3.29%, Mn: 0.09%, Al: 0.03%, S: 0.07%, N : 0.0053%, the balance being inevitable impurities and Fe.
- Magnesium oxide was applied on this electrical steel sheet, and the film characteristics of the forsterite film were investigated.
- the magnesium oxide of the present invention or the magnesium oxide of the comparative example is made into a slurry and applied to a steel sheet so that the mass after drying is 14 ⁇ 10 ⁇ 3 kg ⁇ m ⁇ 2, and after drying, 1473K.
- the final finish annealing was performed for 20.0 hours. After the final finish annealing was completed, the steel sheet was cooled, washed with water, washed with an aqueous hydrochloric acid solution, washed with water again, and dried. The appearance of the coating was judged from the appearance of the coating after cleaning.
- Adhesion of forsterite film was judged from the film state before washing. That is, when the film is uniformly formed and no peeling site exists, ⁇ , when the film is slightly non-uniform, but when the peeling part does not exist, ⁇ , the film is non-uniform and the pinhole-like peeling site is The case where it was present was ⁇ , and the case where the coating was non-uniform and a clear peeling site was present was indicated as x.
- (9) Acid Removability of Unreacted Magnesium Oxide (also simply referred to as “acid removability”) was determined from the state of the film after cleaning. That is, when the unreacted magnesium oxide has been completely removed, ⁇ , although there is no clear unreacted magnesium oxide remaining, but the film is shaded and it is judged that the unreacted magnesium oxide remains slightly. ⁇ , a case where the remaining unreacted magnesium oxide was clearly observed in a dotted manner was indicated by ⁇ , and a case where the unreacted magnesium oxide remained clearly was indicated as x.
- an aqueous boric acid solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water is added to the mixed solution so that the boron content in the finally obtained magnesium oxide is 0.06% by mass.
- the mixture was reacted at 303 K for 6.0 hours while stirring at 300 rpm to obtain a magnesium hydroxide slurry.
- the magnesium hydroxide slurry was filtered, washed with pure water having a mass 100 times the mass of the obtained magnesium hydroxide, and dried at 378 K for 12.0 hours to obtain a magnesium hydroxide powder.
- the obtained magnesium hydroxide powder was fired at 1273 K for 0.5 hour using an electric furnace to obtain a magnesium oxide powder.
- the Blaine specific surface area is 3.4 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area is 25.6 ⁇ 10 3 m 2 ⁇ kg ⁇ . 1 of magnesium oxide was obtained.
- magnesium hydroxide slurry was filtered, washed with pure water having a mass 100 times the mass of the obtained magnesium hydroxide, and dried at 378 K for 12.0 hours to obtain a magnesium hydroxide powder.
- the obtained magnesium hydroxide powder was fired at 1373K for 2.0 hours using an electric furnace.
- magnesium hydroxide slurry was filtered, washed with pure water having a mass 100 times the mass of the obtained magnesium hydroxide, and dried at 378 K for 12.0 hours to obtain a magnesium hydroxide powder.
- the obtained magnesium hydroxide powder was fired at 1273 K for 1.5 hours using an electric furnace.
- Table 1 shows the components of Synthesis Examples 1 to 4 of magnesium oxide produced using reagents as raw materials.
- Examples and Comparative Examples with Reagents> ⁇ Examples 1 to 3, Comparative Examples 1 to 5> Synthesis Examples 1 to 4 were mixed in the formulation shown in Table 2 to obtain magnesium oxides of Examples 1 to 3 and Comparative Examples 1 to 5. Note that the CAA values of magnesium oxide in Examples 1 to 3 and Comparative Examples 1 to 5 were measured, and all were in the range of 60 to 90 seconds.
- the obtained magnesium oxide was applied to a steel plate that had been decarburized and annealed to form a forsterite film on the surface of the steel plate.
- the steel sheet thus obtained was evaluated for the forsterite film production rate, the film appearance, the film adhesion, and the acid-removability of unreacted magnesium oxide. Table 2 shows the results.
- the forsterite film formed using magnesium oxide (Examples 1 to 3) having a BET specific surface area and a Blaine specific surface area in a predetermined range, synthesized using a reagent, is a forsterite film. It is a film having a uniform and sufficient thickness that is excellent in all of the production rate, the appearance of the film, the adhesion of the film, and the acid removal property of unreacted magnesium oxide.
- forsterite coatings formed using magnesium oxide (Comparative Examples 1 to 5) whose BET specific surface area and brane specific surface area are outside the predetermined ranges without adjusting the BET specific surface area and brane specific surface area of magnesium oxide are as follows: It does not satisfy any of the following characteristics: forsterite film formation rate, film appearance, film adhesion, and acid removal property of unreacted magnesium oxide.
- Example 4 A concentration of 2.0 was added to a boric acid aqueous solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so that the boron content in the finally obtained magnesium oxide was 0.07% by mass.
- a calcium hydroxide slurry is added so that the magnesium hydroxide concentration after the reaction becomes 2.0 ⁇ 10 3 mol ⁇ m ⁇ 3 , and at 600 rpm. The mixture was reacted at 323 K for 7.0 hours with stirring.
- magnesium hydroxide was baked in a rotary kiln at 1273K for 1.0 hour to obtain a magnesium oxide powder.
- the final obtained magnesium oxide was measured.
- the specific surface area was 3.8 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 18.6 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Example 5 A concentration of 2.0 was added to a boric acid aqueous solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so that the boron content in the finally obtained magnesium oxide was 0.07% by mass.
- a bitter juice containing magnesium ions of ⁇ 10 3 mol ⁇ m ⁇ 3 a calcium hydroxide slurry is added so that the magnesium hydroxide concentration after the reaction becomes 2.0 ⁇ 10 3 mol ⁇ m ⁇ 3 , and at 600 rpm.
- the mixture was reacted at 353 K for 2.0 hours with stirring. Then, it filtered with the filter press, washed with water, and dried to obtain magnesium hydroxide.
- This magnesium hydroxide was baked in a rotary kiln for 1273K for 2.0 hours to obtain a magnesium oxide powder.
- the Blaine specific surface area and the BET specific surface area of the obtained magnesium oxide so as to be within a predetermined range using an impact type crusher (jet mill)
- the final obtained magnesium oxide was measured.
- the specific surface area was 4.1 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 19.5 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Example 6 A concentration of 2.0 was added to an aqueous boric acid solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so that the boron content in the finally obtained magnesium oxide was 0.06% by mass.
- a bitter juice containing magnesium ions of ⁇ 10 3 mol ⁇ m ⁇ 3 a calcium hydroxide slurry is added so that the magnesium hydroxide concentration after the reaction becomes 1.0 ⁇ 10 3 mol ⁇ m ⁇ 3 , and at 600 rpm.
- the mixture was reacted at 333 K for 20.0 hours with stirring. Then, it filtered with the filter press, washed with water, and dried to obtain magnesium hydroxide.
- This magnesium hydroxide was baked in a rotary kiln at 1373 K for 0.5 hour to obtain a magnesium oxide powder.
- the Blaine specific surface area and the BET specific surface area of the obtained magnesium oxide so as to be within a predetermined range using an impact type crusher (jet mill)
- the final obtained magnesium oxide was measured.
- the specific surface area was 5.3 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 18.8 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Example 7 Calcium hydroxide is added to decarburized seawater so that the magnesium hydroxide concentration after the reaction is 0.05 ⁇ 10 3 mol ⁇ m ⁇ 3, and the boron content in the finally obtained magnesium oxide is 0.
- An aqueous boric acid solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so as to be 0.06% by mass was added and reacted at 323 K for 20.0 hours to produce magnesium hydroxide. Note that 0.02% by mass of the polymer flocculant was added 5.0 hours before the end of the reaction. Then, it filtered with the filter press, washed with water, and dried to obtain magnesium hydroxide.
- This magnesium hydroxide was baked in a rotary kiln at 1373 K for 1.0 hour to obtain a magnesium oxide powder.
- the Blaine specific surface area and the BET specific surface area of the obtained magnesium oxide so as to be within a predetermined range using an impact type crusher (jet mill)
- the final obtained magnesium oxide was measured.
- the specific surface area was 3.1 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 15.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Example 8 Calcium hydroxide is added to decarburized seawater so that the magnesium hydroxide concentration after the reaction is 0.05 ⁇ 10 3 mol ⁇ m ⁇ 3, and the boron content in the finally obtained magnesium oxide is 0.
- An aqueous boric acid solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so as to be 0.06% by mass was added and reacted at 323 K for 20.0 hours to produce magnesium hydroxide. Note that 0.02% by mass of the polymer flocculant was added 5.0 hours before the end of the reaction. Then, it filtered with the filter press, washed with water, and dried to obtain magnesium hydroxide.
- This magnesium hydroxide was baked in a rotary kiln at 1323 K for 1.0 hour to obtain a magnesium oxide powder.
- the Blaine specific surface area and the BET specific surface area of the obtained magnesium oxide so as to be within a predetermined range using an impact type crusher (jet mill)
- the final obtained magnesium oxide was measured.
- the specific surface area was 4.7 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 14.8 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Example 9 A concentration of 2.0 was added to an aqueous boric acid solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so that the boron content in the finally obtained magnesium oxide was 0.06% by mass.
- a bitter juice containing magnesium ions of ⁇ 10 3 mol ⁇ m ⁇ 3 a calcium hydroxide slurry is added so that the magnesium hydroxide concentration after the reaction becomes 1.0 ⁇ 10 3 mol ⁇ m ⁇ 3 , and at 600 rpm.
- the mixture was reacted at 333 K for 20.0 hours with stirring. Then, it filtered with the filter press, washed with water, and dried to obtain magnesium hydroxide.
- This magnesium hydroxide was baked in a rotary kiln at 1373K for 0.75 hours to obtain a magnesium oxide powder.
- the Blaine specific surface area and the BET specific surface area of the obtained magnesium oxide so as to be within a predetermined range using an impact type crusher (jet mill)
- the final obtained magnesium oxide was measured.
- the specific surface area was 3.1 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 12.6 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Example 10 A concentration of 2.0 was added to a boric acid aqueous solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so that the boron content in the finally obtained magnesium oxide was 0.07% by mass.
- a calcium hydroxide slurry is added so that the magnesium hydroxide concentration after the reaction becomes 0.8 ⁇ 10 3 mol ⁇ m ⁇ 3 , and at 600 rpm.
- the mixture was reacted at 333 K for 15.0 hours with stirring. Then, it filtered with the filter press, washed with water, and dried to obtain magnesium hydroxide.
- This magnesium hydroxide was baked in a rotary kiln furnace at 1173 K for 1.5 hours to obtain a magnesium oxide powder.
- the Blaine specific surface area and the BET specific surface area of the obtained magnesium oxide so as to be within a predetermined range using an impact type crusher (jet mill)
- the final obtained magnesium oxide was measured.
- the specific surface area was 4.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 23.4 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Example 11 A concentration of 2.0 was added to an aqueous boric acid solution adjusted to 0.3 ⁇ 10 3 mol ⁇ m ⁇ 3 with pure water so that the boron content in the finally obtained magnesium oxide was 0.06% by mass.
- a calcium hydroxide slurry is added so that the magnesium hydroxide concentration after the reaction becomes 0.8 ⁇ 10 3 mol ⁇ m ⁇ 3 , and at 600 rpm.
- the reaction was carried out at 363 K for 10.0 hours with stirring. Then, it filtered with the filter press, washed with water, and dried to obtain magnesium hydroxide.
- This magnesium hydroxide was baked in a rotary kiln furnace at 1223K for 1.5 hours to obtain a magnesium oxide powder.
- the Blaine specific surface area and the BET specific surface area of the obtained magnesium oxide so as to be within a predetermined range using an impact type crusher (jet mill)
- the final obtained magnesium oxide was measured.
- the specific surface area was 6.1 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 22.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- the magnesium hydroxide was baked in a rotary kiln at 1423K for 1.0 hour to obtain magnesium oxide powder.
- the final obtained magnesium oxide was measured.
- the surface area was 3.3 ⁇ 10 3 m 2 ⁇ kg ⁇ 1
- the BET specific surface area was 7.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- This magnesium hydroxide was baked in a rotary kiln at 1373 K for 1.0 hour to obtain a magnesium oxide powder.
- the final obtained magnesium oxide was measured.
- the surface area was 2.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 7.5 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- This magnesium hydroxide was baked in a rotary kiln at 1473 K for 1.0 hour to obtain a magnesium oxide powder.
- the final obtained magnesium oxide was measured.
- the surface area was 1.2 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 and the BET specific surface area was 5.0 ⁇ 10 3 m 2 ⁇ kg ⁇ 1 .
- Table 3 shows the Blaine specific surface area and BET specific surface area of the magnesium oxides of Examples 4 to 11 and Comparative Examples 6 to 8 obtained as described above.
- the magnesium oxides of Examples 4 to 11 and Comparative Examples 6 to 8 obtained as described above were applied to a steel plate that had been decarburized and annealed to form a forsterite film on the surface of the steel plate.
- the steel sheet thus obtained was evaluated for the forsterite film production rate, the film appearance, the film adhesion, and the acid-removability of unreacted magnesium oxide.
- Table 3 shows the results. When the CAA of magnesium oxide in Examples 4 to 11 and Comparative Examples 6 to 8 was measured, all were in the range of 60 to 90 seconds.
- forsterite coatings formed using magnesium oxide (Comparative Examples 6 to 8) whose BET specific surface area and brane specific surface area are outside the predetermined ranges without adjusting the BET specific surface area and brane specific surface area of magnesium oxide are as follows: (A) Ease of formation of forsterite coating (forsterite coating production rate), (b) appearance of coating, (c) adhesion of coating, and (d) acid removability of unreacted magnesium oxide. Since it did not satisfy any of them, it became clear that a desired steel plate could not be obtained.
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Abstract
Description
本発明の酸化マグネシウムがカルシウム(Ca)を含む場合、カルシウムの含有量は、CaO換算で0.2~2.0質量%であることが好ましい。本発明の酸化マグネシウムがリン(P)を含む場合、リンの含有量は、P2O3換算で0.03~0.15質量%であることが好ましい。本発明の酸化マグネシウムがホウ素(B)を含む場合、ホウ素の含有量は、0.04~0.15質量%であることが好ましい。本発明の酸化マグネシウムが硫黄(S)を含む場合、硫黄の含有量は、SO3換算で0.01~1.5質量%であることが好ましい。本発明の酸化マグネシウムがフッ素(F)を含む場合、フッ素の含有量は、0.05質量%以下であることが好ましい。本発明の酸化マグネシウムが塩素(Cl)を含む場合、塩素の含有量は、0.05質量%以下であることが好ましい。本発明の酸化マグネシウムがケイ素(Si)を含む場合、ケイ素の含有量は、0.05~0.5質量%であることが好ましい。なお、本明細書の「質量%」は、「重量%」と同じ意味である。
(1)BET比表面積の測定方法
比表面積測定装置(Macsorb、Mountech Co., Ltd.製)を使用して、窒素ガスを用いたガス吸着法(BET法)によりBET比表面積を測定した。
ブレーン空気透過装置(C-202B 株式会社西日本試験機製)により、JIS R5201:2015(8.粉末度試験、8.1比表面積試験)のとおりにブレーン比表面積を測定した。本測定では室温298K±1、ポロシチーを0.80に設定して測定した。
測定試料を、12Nの塩酸(試薬特級)に加え加熱して完全に溶解させた後、ICP発光分光分析装置(PS3520 VDD 株式会社日立ハイテクサイエンス製)を用いて、ホウ素(B)の含有量を測定した。
塩素(Cl)の含有量については、試料を酸に溶解した後、分光光度計(UV-2550、島津製作所製)を用いて質量を測定することで、試料中の濃度を算出した。
0.4Nのクエン酸溶液1×10-4m3と、指示薬として適量(2×10-6m3)の1%フェノールフタレイン液とを、2×10-4m3ビーカーに入れ、液温を303Kに調整し、マグネットスターラーを使用して700rpmで攪拌しながら、クエン酸溶液中に40%の最終反応当量の酸化マグネシウムを投入して、最終反応までの時間、つまりクエン酸が消費され溶液が中性となるまでの時間を測定した。
フォルステライトの形成機構は反応式:2MgO+SiO2→Mg2SiO4で示される。そのため、酸化マグネシウム粉末と非晶質の二酸化ケイ素のモル比を、2:1になるように調合した混合物を作成し、この混合物0.8×10-3kgを圧力50MPaで成形し、直径15×10-3m、高さ約3×10-3mの成形体を得た。次に、この成形体を窒素雰囲気中で、1473Kで4.0時間焼成し、得られた焼結体中のフォルステライト生成量を、X線回折により定量分析した。生成率が90%以上の場合、充分な反応性を有し、良好なフォルステライト被膜が形成されると考えられる。
フォルステライト被膜の外観、フォルステライト被膜の密着性及び未反応酸化マグネシウムの酸除去性の試験試料供試鋼として、方向性電磁鋼板用のケイ素鋼スラブを、公知の方法で熱間圧延、冷間圧延を行って、最終板厚0.28×10-3mとし、更に、窒素25%+水素75%の湿潤雰囲気中で脱炭焼鈍した鋼板を用いた。脱炭焼鈍前の鋼板の組成は、質量%で、C:0.01%、Si:3.29%、Mn:0.09%、Al:0.03%、S:0.07%、N:0.0053%、残部は不可避的な不純物とFeである。この電磁鋼板上に酸化マグネシウムを塗布して、フォルステライト被膜の被膜特性を調査した。具体的には、本発明の酸化マグネシウム又は比較例の酸化マグネシウムをスラリー状にして、乾燥後の質量で14×10-3kg・m-2になるように鋼板に塗布し、乾燥後、1473Kで20.0時間の最終仕上焼鈍を行った。最終仕上焼鈍が終了したのち冷却し、鋼板を水洗し、塩酸水溶液で酸洗浄した後、再度水洗して、乾燥させた。被膜の外観は、洗浄後の被膜の外観から判断した。すなわち、灰色のフォルステライト被膜が、均一に厚く形成されている場合を◎、被膜が均一であるがやや薄く形成されている場合を○、被膜が不均一で薄いが、下地の鋼板が露出している部分がない場合を△、被膜が不均一で非常に薄く、下地の鋼板が明らかに露出した部分がある場合を×とした。
フォルステライト被膜の密着性は、洗浄前の被膜状態から判断した。すなわち、被膜が均一に形成され、剥離部位が存在しない場合を◎、被膜が僅かに不均一であるが、剥離部分が存在しない場合を○、被膜が不均一で、ピンホール状の剥離部位が存在する場合を△、被膜が不均一で、明確な剥離部位が存在する場合を×とした。
未反応酸化マグネシウムの酸除去性(単に、「酸除去性」ともいう。)は、洗浄後の被膜状態から判断した。すなわち、未反応の酸化マグネシウムが完全に除去されている場合を◎、明確な未反応酸化マグネシウムの残存は認められないものの、被膜に濃淡があり僅かに未反応酸化マグネシウムが残存すると判断した場合を○、点状に未反応酸化マグネシウムの残存が明確に観察される場合を△、明らかに未反応酸化マグネシウムが残存している場合を×とした。
<合成例1>
塩化マグネシウム(試薬特級)を純水に溶解させ0.5×103mol・m-3の塩化マグネシウム水溶液を作製した。次に水酸化カルシウム(試薬特級)を純水に入れ、0.5×103mol・m-3の水酸化カルシウム分散液を作製した。これらの塩化マグネシウム水溶液及び水酸化カルシウム分散液をMgCl2/Ca(OH)2=1.1のモル比で1.0×10-3m3になるように混合し、混合液を得た。その後、最終的に得られる酸化マグネシウム中のホウ素含有量(B)が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を混合液に投入し、4枚ばねの攪拌羽を使用して、300rpmで撹拌しながら363Kにて6.0時間反応させ、水酸化マグネシウムスラリーを得た。その後、水酸化マグネシウムスラリーをろ過し、得られる水酸化マグネシウムの質量の100倍の質量の純水で洗浄し、378Kで12.0時間乾燥して水酸化マグネシウム粉末を得た。得られた水酸化マグネシウム粉末を、電気炉を用いて、1073Kで2.0時間焼成した。このようにして、ブレーン比表面積が7.6×103m2・kg-1、BET比表面積が29.2×103m2・kg-1の酸化マグネシウムを得た。
塩化マグネシウム(試薬特級)を純水に溶解させ0.5×103mol・m-3の塩化マグネシウム水溶液を作製した。次に水酸化カルシウム(試薬特級)を純水に入れ、0.5×103mol・m-3の水酸化カルシウム分散液を作製した。これらの塩化マグネシウム水溶液及び水酸化カルシウム分散液をMgCl2/Ca(OH)2=1.1のモル比で1.0×10-3m3になるように混合し、混合液を得た。その後、最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を混合液に投入し、4枚ばねの攪拌羽を使用して、300rpmで撹拌しながら303Kにて6.0時間反応させ、水酸化マグネシウムスラリーを得た。その後、水酸化マグネシウムスラリーをろ過し、得られる水酸化マグネシウムの質量の100倍の質量の純水で洗浄し、378Kで12.0時間乾燥して水酸化マグネシウム粉末を得た。得られた水酸化マグネシウム粉末を、電気炉を用いて、1273Kで0.5時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムをボールミルにて1.0時間粉砕することで、ブレーン比表面積が3.4×103m2・kg-1、BET比表面積が25.6×103m2・kg-1の酸化マグネシウムを得た。
塩化マグネシウム(試薬特級)を純水に溶解させ0.5×103mol・m-3の塩化マグネシウム水溶液を作製した、次に水酸化カルシウム(試薬特級)を純水に入れ、0.5×103mol・m-3の水酸化カルシウム分散液を作製した。これらの塩化マグネシウム水溶液及び水酸化カルシウム分散液をMgCl2/Ca(OH)2=1.1のモル比で1.0×10-3m3になるように混合し、混合液を得た。その後、最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を混合液に投入し、4枚ばねの攪拌羽を使用して、600rpmで撹拌しながら、363Kにて5.5時間反応させ水酸化マグネシウムスラリーを得た。その後、水酸化マグネシウムスラリーをろ過し、得られる水酸化マグネシウムの質量の100倍の質量の純水で洗浄し、378Kで12.0時間乾燥して水酸化マグネシウム粉末を得た。得られた水酸化マグネシウム粉末を、電気炉を用いて、1373Kで2.0時間焼成した。このようにして、ブレーン比表面積が1.4×103m2・kg-1、BET比表面積が5.0×103m2・kg-1の酸化マグネシウムを得た。
塩化マグネシウム(試薬特級)を純水に溶解させ0.5×103mol・m-3の塩化マグネシウム水溶液を作製した、次に水酸化カルシウム(試薬特級)を純水に入れ、0.5×103mol・m-3の水酸化カルシウム分散液を作製した。これらの塩化マグネシウム水溶液及び水酸化カルシウム分散液をMgCl2/Ca(OH)2=1.1のモル比で1.0×10-3m3になるように混合し、混合液を得た。その後、最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を混合液に投入し、4枚ばねの攪拌羽を使用して、600rpmで撹拌しながら313Kにて5.5時間反応させ、水酸化マグネシウムスラリーを得た。その後、水酸化マグネシウムスラリーをろ過し、得られる水酸化マグネシウムの質量の100倍の質量の純水で洗浄し、378Kで12.0時間乾燥して水酸化マグネシウム粉末を得た。得られた水酸化マグネシウム粉末を、電気炉を用いて、1273Kで1.5時間焼成した。このようにして、ブレーン比表面積が0.7×103m2・kg-1、BET比表面積が23.8×103m2・kg-1の酸化マグネシウムを得た。
<実施例1~3、比較例1~5>
合成例1~4を、表2に示す配合で混合し、実施例1~3及び比較例1~5の酸化マグネシウムを得た。なお、実施例1~3及び比較例1~5の酸化マグネシウムのCAAを測定したところ、すべて60~90秒の範囲だった。
<実施例4>
最終的に得られる酸化マグネシウム中のホウ素含有量が0.07質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が2.0×103mol・m-3になるように添加し、600rpmで撹拌しながら323Kにて7.0時間反応させた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンで、1273K、1.0時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が3.8×103m2・kg-1、BET比表面積が18.6×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.07質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が2.0×103mol・m-3になるように添加し、600rpmで攪拌しながら353Kで2.0時間反応させた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンで、1273K、2.0時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が4.1×103m2・kg-1、BET比表面積が19.5×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が1.0×103mol・m-3になるように添加し、600rpmで攪拌しながら333Kにて20.0時間反応させた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンで、1373K、0.5時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が5.3×103m2・kg-1、BET比表面積が18.8×103m2・kg-1であった。
反応後の水酸化マグネシウム濃度が0.05×103mol・m-3となるように、脱炭処理した海水に水酸化カルシウムを加え、最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入し、323Kで20.0時間、反応させて水酸化マグネシウムを生成した。なお、反応終了5.0時間前に、高分子凝集剤を0.02質量%加えた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンにより、1373K、1.0時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が3.1×103m2・kg-1、BET比表面積が15.0×103m2・kg-1であった。
反応後の水酸化マグネシウム濃度が0.05×103mol・m-3となるように、脱炭処理した海水に水酸化カルシウムを加え、最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入し、323Kで20.0時間、反応させて水酸化マグネシウムを生成した。なお、反応終了5.0時間前に、高分子凝集剤を0.02質量%加えた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンにより、1323K、1.0時間で焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が4.7×103m2・kg-1、BET比表面積が14.8×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が1.0×103mol・m-3になるように添加し、600rpmで攪拌しながら333Kにて20.0時間反応させた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンで、1373K、0.75時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が3.1×103m2・kg-1、BET比表面積が12.6×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.07質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が0.8×103mol・m-3になるように添加し、600rpmで攪拌しながら333Kにて15.0時間反応させた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルン炉で、1173K、1.5時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が4.0×103m2・kg-1、BET比表面積が23.4×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が0.8×103mol・m-3になるように添加し、600rpmで攪拌しながら、363Kにて10.0時間反応させた。その後、フィルタープレスでろ過し、水洗し、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルン炉で、1223K、1.5時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られた酸化マグネシウムを測定した結果、ブレーン比表面積が6.1×103m2・kg-1、BET比表面積が22.0×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が0.8×103mol・m-3になるように添加し、600rpmで攪拌しながら、333Kにて10.0時間反応させた。その後フィルタープレスでろ過、水洗、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンで、1423K、1.0時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られる酸化マグネシウムを測定した結果、ブレーン比表面積が3.3×103m2・kg-1、BET比表面積が7.0×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が0.8×103mol・m-3になるように添加し、600rpmで攪拌し、353Kにて6.0時間反応させた。その後フィルタープレスでろ過、水洗、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンで、1373K、1.0時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られる酸化マグネシウムを測定した結果、ブレーン比表面積が2.0×103m2・kg-1、BET比表面積が7.5×103m2・kg-1であった。
最終的に得られる酸化マグネシウム中のホウ素含有量が0.06質量%になるように、純水で0.3×103mol・m-3に調整したホウ酸水溶液を投入した濃度2.0×103mol・m-3のマグネシウムイオンを含む苦汁に、水酸化カルシウムスラリーを、反応後の水酸化マグネシウム濃度が0.8×103mol・m-3になるように添加し、600rpmで攪拌しながら、343Kにて8.0時間反応させた。その後フィルタープレスでろ過、水洗、乾燥して水酸化マグネシウムを得た。この水酸化マグネシウムをロータリーキルンで、1473K、1.0時間焼成し、酸化マグネシウム粉末を得た。得られた酸化マグネシウムを、衝撃型粉砕機(ジェットミル)を用いて所定の範囲になるようにブレーン比表面積及びBET比表面積を調整し、最終的に得られる酸化マグネシウムを測定した結果、ブレーン比表面積が1.2×103m2・kg-1、BET比表面積が5.0×103m2・kg-1であった。
Claims (4)
- BET比表面積が12.0×103~25.0×103m2・kg-1、及びブレーン比表面積が2.0×103~7.0×103m2・kg-1である焼鈍分離剤用酸化マグネシウム。
- ホウ素を0.04~0.15質量%含有し、塩素含有量が0.05質量%以下である請求項1に記載の焼鈍分離剤用酸化マグネシウム。
- 請求項1又は2に記載の焼鈍分離剤用酸化マグネシウムを含む焼鈍分離剤。
- 鋼板表面に二酸化ケイ素被膜を形成する工程と、
請求項3に記載の焼鈍分離剤を二酸化ケイ素被膜の表面に塗布し、焼鈍することにより、鋼板表面にフォルステライト被膜を形成する工程と
を含む、方向性電磁鋼板の製造方法。
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JP7107454B1 (ja) * | 2020-09-01 | 2022-07-27 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法 |
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JP2017179459A (ja) | 2017-10-05 |
RU2719845C1 (ru) | 2020-04-23 |
JP6472767B2 (ja) | 2019-02-20 |
EP3438324B1 (en) | 2020-06-24 |
KR20180128023A (ko) | 2018-11-30 |
CN117566774A (zh) | 2024-02-20 |
EP3438324A4 (en) | 2019-09-18 |
US11566297B2 (en) | 2023-01-31 |
KR102380418B1 (ko) | 2022-03-29 |
PL3438324T3 (pl) | 2020-11-02 |
EP3438324A1 (en) | 2019-02-06 |
IL261951A (en) | 2018-10-31 |
CN108884570A (zh) | 2018-11-23 |
US20200123627A1 (en) | 2020-04-23 |
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