JP5425300B2 - 六方晶フェライト磁性粉末およびそれを用いた磁気記録媒体 - Google Patents
六方晶フェライト磁性粉末およびそれを用いた磁気記録媒体 Download PDFInfo
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- JP5425300B2 JP5425300B2 JP2012509473A JP2012509473A JP5425300B2 JP 5425300 B2 JP5425300 B2 JP 5425300B2 JP 2012509473 A JP2012509473 A JP 2012509473A JP 2012509473 A JP2012509473 A JP 2012509473A JP 5425300 B2 JP5425300 B2 JP 5425300B2
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- magnetic powder
- powder
- magnetic
- hexagonal ferrite
- ferrite magnetic
- Prior art date
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- 239000006247 magnetic powder Substances 0.000 title claims description 107
- 229910000859 α-Fe Inorganic materials 0.000 title claims description 54
- 239000000843 powder Substances 0.000 claims description 63
- 238000000034 method Methods 0.000 claims description 31
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 23
- 239000012490 blank solution Substances 0.000 claims description 22
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 20
- 229910017604 nitric acid Inorganic materials 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000009835 boiling Methods 0.000 claims description 10
- 229910052797 bismuth Inorganic materials 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 229910052779 Neodymium Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 238000004438 BET method Methods 0.000 claims description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 81
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 27
- 239000011521 glass Substances 0.000 description 26
- 239000000203 mixture Substances 0.000 description 18
- 229910052761 rare earth metal Inorganic materials 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 13
- 239000000126 substance Substances 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 12
- 239000007864 aqueous solution Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
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- 239000002356 single layer Substances 0.000 description 11
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
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- 230000008859 change Effects 0.000 description 9
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 9
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 9
- 239000000523 sample Substances 0.000 description 9
- 239000008117 stearic acid Substances 0.000 description 9
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- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 6
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical group [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 6
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- 238000002844 melting Methods 0.000 description 5
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
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- 230000000704 physical effect Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- 229910052712 strontium Inorganic materials 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
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- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- -1 such as Co Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 229910052772 Samarium Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 229910000416 bismuth oxide Inorganic materials 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- 229910052810 boron oxide Inorganic materials 0.000 description 2
- 229910000428 cobalt oxide Inorganic materials 0.000 description 2
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 2
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000012088 reference solution Substances 0.000 description 2
- 239000012488 sample solution Substances 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- DCXXMTOCNZCJGO-UHFFFAOYSA-N Glycerol trioctadecanoate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 206010065042 Immune reconstitution inflammatory syndrome Diseases 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
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- 230000001133 acceleration Effects 0.000 description 1
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- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000007865 diluting Methods 0.000 description 1
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- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 238000012812 general test Methods 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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- 239000003112 inhibitor Substances 0.000 description 1
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- 150000002505 iron Chemical group 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
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- 238000000691 measurement method Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 230000003472 neutralizing effect Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
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- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
- G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
- G11B5/70678—Ferrites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2683—Other ferrites containing alkaline earth metals or lead
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62665—Flame, plasma or melting treatment
-
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/10—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/11—Powder tap density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/16—Pore diameter
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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Description
本発明に従う粒子は、主組成となる鉄とアルカリ土類金属(A)の他、保磁力を調整するための2価、4価の添加元素(M1,M2)や、形状を制御するための添加元素であるビスマスの組成を含む。また、さらなる添加元素としてNbといった5族元素、もしくは希土類元素が含まれる。とりわけ希土類元素の添加は粒子の微粒子化が促進されるようになり、上述の課題の1つである小粒子体積化(高比表面積化)が比較的調整しやすくなるので好ましい。
以上示した性質を有する磁性粉末は、例えば下記のような手法を用いて製造することができる。本明細書ではいわゆるガラス結晶化法、といわれる手法を用いた例について示す。また、物量については他の手法を用いて磁性粉を形成させた場合にも応用は可能である。
得られた磁性粉を、以下に示す方法により物性を評価した。
粒子の平均板径もしくは粒子径および板状比は、透過型電子顕微鏡(日本電子株式会社製のJEM−100CXMark−II型)を使用し、100kVの加速電圧で、明視野で磁性粉末を観察した像を写真撮影し、平均板径もしくは粒子径については約300個の、平均板状比については約100個の粒子を測定した。
得られた磁性粉は、最終的に得られた磁性粉を下記に示す方法により評価した。すなわち、鉄は試料を溶解し、平沼産業株式会社製の平沼自動滴定装置(CONTIME−980型)を使用して定量した。また、その他の成分の定量は、粉体を溶解させ、日本ジャーレルアッシュ株式会社製の高周波誘導プラズマ発光分析装置ICP(IRIS/AP)を使用し定量した。
粒子の比表面積は、BET一点法を用いて測定し、測定装置はユアサイオニクス株式会社製の4ソーブUSを使用して測定した。
磁性粉末をφ6mmのプラスチック製容器に詰め、東英工業株式会社製のVSM装置(VSM−7P)を使用して、外部磁場795.8kA/m(10kOe)で、保磁力Hc(Oe、kA/m)、飽和磁化σs(Am2/kg)、角形比SQ、粉体のBSFD(バルク状態におけるSFD値)を測定した。
得られた磁性粉末(最終製品としての磁性粉末)0.35gを秤量して(内径45mm、深さ13mmの)ポットに入れ、蓋を開けた状態で10分間放置した後、マイクロピペットでビヒクル(日本ゼオン株式会社製の塩化ビニル系樹脂MR−555(20質量%)と、東洋紡株式会社製のバイロン(登録商標)UR−8200(30質量%)、シクロヘキサノン(50質量%)と、アセチルアセトン(0.3質量%)と、ステアリン酸−n−ブチル(0.3質量%)の混合溶液)0.7mLを添加し、その直後にスチールボール(2φ)30g、ナイロンボール(8φ)10個をポットに加えて、蓋を閉じた状態で10分間静置した。
粒子の粉体pHの測定は、JIS規格K−5101−17−1:2004(顔料試験方法−第17部:pH値−第1節:煮沸抽出法)に記載の方法を採用して測定する。概略としては下記に従う。
ステアリン酸吸着量は、窒素で置換したグローブボックス中において、本実施例で得られた磁性粉末を30メッシュで解粒した試料2.0gを、2質量%のステアリン酸が溶解したメチルエチルケトン溶液15.0gに添加し、下部から永久磁石を用いて試料を凝集させ、上澄み液10gを分取してホットプレート上において90℃で3時間加熱した後の残分の重量を測定して、ステアリン酸吸着量をA=1000×B×(C/100)×[1−E/{(C/100)×D}]/Fから算出した。但し、Aはステアリン酸吸着量(mg/g)、Bは溶液の全重量(g)(ここでは15.0g)、Cは溶液中のステアリン酸濃度(質量%)(ここでは2質量%)、Dは上澄み液の重量(g)(ここでは10g)、Eは90℃で3時間加熱した後の残分の重量(g)、Fは試料の重量(g)(ここでは2g)である。この式中、B×(C/100)は当初の溶液中のステアリン酸の重量(g)を示し、[1−E/{(C/100)×D}]は上澄み液中に残存するステアリン酸の割合を示している。
500メッシュで解粒したフェライト粉末0.05gを、0.1モル/Lの硝酸カリウムを含むpH=11の水酸化カリウム溶液100mLに添加した後、この溶液に0.01モル/Lの硝酸水溶液を0.02mL/分の速度で添加して、磁性粉末の試料溶液のpHの経時変化、言い換えると添加した硝酸水溶液量に対する試料溶液のpHの変化を測定した。ここで、水酸化カリウム水溶液もしくはその代替溶液は空気中の炭酸を吸収する作用があることから、作製から数日経過した液を使用することは好ましくない。
粒子の等酸点は、先に述べたとおり粒子と周囲の溶液間において、プロトンの出入りがバランスする点である。すなわち滴定曲線ではリファレンスの滴定曲線と粉末が存在する場合の滴定曲線の交点のpH値である。通常、この値は供試粉末の量により大きく変化することはないが、表面が汚染されているような粒子の場合には大きく乖離することがわかった。例えば、0.05gと0.5gを比較した場合、等酸点の乖離は小さければ小さい方が好ましく、具体的には±1.5以内、より好ましくは±1.0以内であることが好ましい。例えば図3に示したように、磁性粉の量が0.05gと0.5gでは、等酸点はずれるが、その差は、1.0以内である。
主構成成分として、酸化鉄162.04g(株式会社鉄源製/HRT)、炭酸バリウム(堺化学工業株式会社製/BW−P)289.69gを秤量し、ガラス形成成分として酸化ホウ素(Borax製/工業用)89.47g、添加物として酸化コバルト(和光純薬工業株式会社製/特級試薬)6.08g、二酸化チタン(和光純薬工業株式会社製/特級試薬)6.48g、酸化ビスマス(関東化学株式会社製/試薬)18.91g、酸化ネオジム(キシダ化学製、3N)27.32gをそれぞれ秤量した。これは、希土類元素と鉄のモル比が8%にあたる量である。以下の実施例も全て希土類元素と鉄のモル比は8%となるようにして仕込みを行った。なお、作製時の仕込みは希土類金属と鉄の比率をモル比で8になるように仕込んだが、出来上がりは、0.8となった。表1には、最終粉末でのモル比を示した。
実施例1において、洗浄をアルカリ洗浄法に変えて、ガラス体の除去を行ってから、濾液導電率が0.8mS/m以下になるまで繰返して純水で洗浄を行った以外は実施例1を繰り返した。得られた磁性粉の物理特性を表2に、磁性粉の磁気特性を表3に示す。
実施例1において、熱処理時温度を670℃とし、洗浄をアルカリ洗浄法に変えて、ガラス体の除去を行ってから、濾液導電率が1.0mS/m以下になるまで繰返して純水で洗浄を行った以外は実施例1を繰り返した。得られた磁性粉の物理特性を表2に、磁性粉の磁気特性を表3に示す。
実施例1において、ガラス体の処理温度を625℃とした以外は同様にして、磁性粉末を得た。得られた磁性粉の物理特性を表2に、磁性粉の磁気特性を表3に示す。
実施例1において、希土類元素であるNdの添加量を変化させた以外は実施例1を繰り返した。得られた磁性粉の物理特性を表2に、磁性粉の磁気特性を表3に示す。
実施例1において、フェライトの原料仕込みを変化させた以外は実施例1を繰り返した。なお、この実施例では希土類元素であるNd等は使用せず、5族元素としてNbを添加している。得られた磁性粉の物理特性を表2に、磁性粉の磁気特性を表3に示す。(実施例8は実施例7のNb添加量を増やした場合を示す)
実施例7において、Ti、Coを添加せず、かつBiおよびNbの添加量をそれぞれ変化させた例である。得られた磁性粉の物理特性を表2に、磁性粉の磁気特性を表3に示す。
主構成成分として、酸化鉄14.15g(株式会社鉄源製HRT)、炭酸バリウム(堺化学工業株式会社製/BW−P)25.29gを秤量し、ガラス形成成分として酸化ホウ素(Borax製/工業用)7.81g、添加物として酸化コバルト(和光純薬工業株式会社製/特級試薬)0.53g、二酸化チタン(和光純薬工業株式会社製/特級試薬)0.57g、酸化ビスマス(関東化学株式会社製/試薬)1.65gをそれぞれ秤量した。
実施例1において、溶解温度を1400℃とし、熱処理時温度を640℃とした以外は同様にして、フェライト磁性粉末を得た。
2 タンク
3 電位計(pH計)
4 滴定装置
5 窒素ガス導入管
6 マグネチックスターラー
7 攪拌子
8 磁力線
10 0.5gの等酸点
11 0.05gの等酸点
Claims (9)
- 六方晶フェライト磁性粉末であって、
pH=11の水酸化カリウム溶液をブランク溶液として、
前記ブランク溶液100mLのpH値を5にする量の0.10mol/Lの硝酸を、
前記ブランク溶液100mLに0.05g量の当該粉末を加えた溶液に添加した時に指示されるpH値が5以上となる六方晶フェライト磁性粉末。 - 六方晶フェライト磁性粉末であって、
pH=11の水酸化カリウム溶液をブランク溶液として、
前記ブランク溶液100mLのpH値を5にする量の0.10mol/Lの硝酸を、前記ブランク溶液100mLに0.05g量の当該粉末を加えた溶液に添加した時に得られるpH値を、試料を添加した時のpH値とし、リファレンスにおけるpH値を5にした時に(1)式で算出されるプロトン(H+)が0以上である六方晶フェライト磁性粉末。
- 前記六方晶フェライト磁性粉末0.05gで算出される等酸点と0.5gで算出される等酸点との差が±1.5未満である請求項1ないし2のいずれかに記載の六方晶フェライト磁性粉末。
- 粒子のJIS規格K−5101−17−1:2004の煮沸法により算出される粉末pHが7.0以上である、請求項1または3のいずれかに記載の六方晶フェライト磁性粉末。
- 平均板径が10〜30nm、BET法により算出される比表面積が50m2/g以上である、請求項1ないし4のいずれかに記載の六方晶フェライト磁性粉末。
- 前記六方晶フェライト磁性粉末を100mLの純水に1g添加し、10分間放置した際に溶出する水溶性カルシウム量が5ppm以下であることを特徴とする請求項1ないし5のいずれかに記載の六方晶フェライト磁性粉末。
- 前記六方晶フェライト磁性粉末を100mLの純水に1g添加し、10分間放置した際に溶出する水溶性ナトリウム量が13ppm以下であることを特徴とする請求項1ないし6のいずれかに記載の六方晶フェライト磁性粉末。
- 前記六方晶フェライト磁性粉末は、Co、Ti、BiにNd若しくはNbが含まれることを特徴とする請求項1ないし7のいずかに記載の六方晶フェライト磁性粉末。
- 請求項1ないし8のいずれかに記載の磁性粉末を使用する、磁気記録媒体。
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JP6485353B2 (ja) | 2013-08-23 | 2019-03-20 | ソニー株式会社 | フェリ磁性粒子粉末の製造方法、および磁気記録媒体の製造方法 |
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