WO2007077811A1 - 酸化物磁性材料 - Google Patents
酸化物磁性材料 Download PDFInfo
- Publication number
- WO2007077811A1 WO2007077811A1 PCT/JP2006/325859 JP2006325859W WO2007077811A1 WO 2007077811 A1 WO2007077811 A1 WO 2007077811A1 JP 2006325859 W JP2006325859 W JP 2006325859W WO 2007077811 A1 WO2007077811 A1 WO 2007077811A1
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- WIPO (PCT)
- Prior art keywords
- magnetic material
- material according
- oxide magnetic
- oxide
- ferrite
- Prior art date
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- 239000000696 magnetic material Substances 0.000 title claims abstract description 56
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 62
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 229910017061 Fe Co Inorganic materials 0.000 claims description 36
- 230000004907 flux Effects 0.000 claims description 32
- 239000013078 crystal Substances 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 14
- 238000005245 sintering Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 3
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 34
- 239000011575 calcium Substances 0.000 description 30
- 238000001354 calcination Methods 0.000 description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 239000000203 mixture Substances 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 239000002994 raw material Substances 0.000 description 14
- 230000007423 decrease Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 238000010298 pulverizing process Methods 0.000 description 11
- 238000010304 firing Methods 0.000 description 9
- 229910052746 lanthanum Inorganic materials 0.000 description 8
- 229910052712 strontium Inorganic materials 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- 229910052791 calcium Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 239000006247 magnetic powder Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 239000012071 phase Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229940038504 oxygen 100 % Drugs 0.000 description 2
- 238000003746 solid phase reaction Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- -1 cationic metal oxides Chemical class 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005118 spray pyrolysis Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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- C01G51/006—Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen
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- 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
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- C01G49/0018—Mixed oxides or hydroxides
- C01G49/0036—Mixed oxides or hydroxides containing one alkaline earth metal, magnesium or lead
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- G11B5/62—Record carriers characterised by the selection of the material
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- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/767—Hexagonal symmetry, e.g. beta-Si3N4, beta-Sialon, alpha-SiC or hexa-ferrites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
Definitions
- the present invention relates to an oxide magnetic material.
- Ferrite is a general term for compounds formed by divalent cationic metal oxides and trivalent iron, and ferrite magnets are used in various applications such as various rotating machines and speakers.
- ferrite magnets Sr ferrite (SrFe 2 O 3) and Ba ferrite (BaFe 2 O 3) having a magnetoplumbite type hexagonal structure are widely used. These ferrites
- Element A is a metal that becomes a divalent cation, and is selected from forces such as Sr, Ba, and Pb.
- Patent Document 2 (Patent Document 2).
- Patent Document 3 Japanese Patent No. 3163279
- Patent Document 2 International Publication WO2005Z027153 Pamphlet
- Patent Document 3 Japanese Patent No. 3181559
- Ca ferrite In Ca ferrite, the structure of CaO-FeO or CaO-2FeO is stable. It is known that hexagonal ferrite is formed by adding La. However, the magnetic properties obtained were similar to those of conventional Ba ferrite and were not high. Therefore, in Patent Document 3, by adding La and Co simultaneously to Ca ferrite (hereinafter referred to as “CaLa Co ferrite”), the residual magnetic flux density B, the coercive force H are improved, and the temperature characteristics of the coercive force H r cj cj. It is disclosed to improve the above.
- CaLa Co ferrite by adding La and Co simultaneously to Ca ferrite
- Sr ferrite in which a part of Sr is replaced with a rare earth element such as La and a part of Fe is replaced with Co or the like (hereinafter referred to as “SrLaCo ferrite” t) is Due to its excellent magnetic properties, it is widely used in various applications in place of conventional Sr ferrite and Ba ferrite.
- r cj is a high-performance ferrite magnet that has both high residual magnetic flux density B and coercive force H.
- CaLaCo ferrite according to Patent Document 3 exceeds anisotropic magnetic field H force rLaCo ferrite.
- both the residual magnetic flux density B and the coercive force H are the conventional SrLaCo flight and r cj
- the purpose is to provide an oxide magnetic material superior to CaLaCo ferrite.
- the metal element contained in the oxide magnetic material is represented by the formula Ca La Sr Fe Co l- ⁇ - ⁇ xx 2n to yy, and represents the atomic ratio ⁇ , ⁇ ′, y, and the molar ratio n But,
- Oxide magnetic material that satisfies the above relationship.
- the acid magnetic material according to the above (1) to (7) is a calcined body.
- the oxide magnetic material described in (1) to (7) above is a sintered magnet.
- a magnetic recording medium comprising the oxide magnetic material according to (8).
- a rotating machine including the acid magnetic material according to any one of (10) to (13).
- the metal element contained in the sintered magnet is represented by the formula Ca La Sr Fe Co.
- Sintered magnet that satisfies the above relationship.
- the calcined body according to the present invention contains 50% or more of crystals having an aspect ratio (length 1Z thickness d) of 3 or less and a small particle size, a sintered magnet is produced from the calcined body In addition, high B and high H can be obtained.
- the sintered magnet according to the present invention has high B and high H, it is ideal for applications such as motors. R cj
- FIG. 6 is a graph showing the relationship between the residual magnetic flux density B and the coercive force H of the sintered magnet according to the comparative example, which is 6 to 5.9, r cj.
- FIG. 5 is a graph showing the relationship between the residual magnetic flux density B and the coercive force H of a sintered magnet according to the present invention, where 5.4 is assumed and the calcination temperature is 1150 to 1300.
- ⁇ - ⁇ - ⁇ 'xx, 2n ⁇ yy 5 is a graph showing the relationship between the residual magnetic flux density B and the coercive force H of a sintered magnet according to the present invention, where 5.4 is set and the calcining temperature is 1150 to 1250.
- FIG. 5 is an SEM photograph substituting for a drawing of a calcined body according to the present invention, which was set to 5.4.
- CaLaCo ferrite has an anisotropic magnetic field H greater than SrLaCo ferrite.
- the ratio between 0 ⁇ ) and (0)) is 7 ⁇ 1, preferably xZy ⁇ l. 3, more preferably x / y ⁇ l. 38, and Ca / Sr ⁇ l Further, by setting n to 5.2 to 5.8, preferably 5.2 to 5.5, more preferably 5.3 to 5.5, an oxide magnet having high B and high H r cj
- the inventors have found that a functional material can be obtained, and have proposed the present invention.
- the SrLaCo ferrite according to Patent Document 1 has no description about replacing 50% or more of Sr with Ca (CaZSr ⁇ 1), and SrL aCo ferrite in which a part of Sr according to Patent Document 2 is replaced with Ca.
- substitution amount of Ca being 50% CaZ (Sr + Ca) and replacing 50% or more of Sr with Ca (CaZSr ⁇ 1).
- Patent Document 3 preferably describes the force x and y at which CaLaCo ferrite is described, and the range thereof is 0.4 to 0.6 from the description of the examples.
- Patent Document 3 describes examples in which a part of Ca in CaLaCo ferrite is replaced with Sr (Example 11, Fig. 15, Fig. 16).
- the amount of force X (La), y (Co) are both 0.6, and the coercive force H decreases as Ca is replaced by Sr. This is because, like this invention,
- An acidic magnetic material according to the present invention is a gold represented by the formula Ca La Sr Fe Co.
- the number of moles of oxygen varies depending on the valence of Fe and Co, the calcination or firing atmosphere. For example, when the firing atmosphere is a reducing atmosphere, oxygen deficiency (vacancy) may occur.
- the oxide magnetic material according to the present invention is represented by the formula Ca La Sr Fe Co O ⁇ .
- the present invention relates to an improvement of CaLaCo flight, which is characterized in that Ca is an essential element and a part of the Ca is substituted with Sr. After replacing a part of Ca with Sr, the magnetic properties may not be deteriorated. A part of Ca or Sr may be replaced with Ba and Z or Pb to some extent! /. [0049] La is also an essential element, but to some extent the magnetic properties are not deteriorated, a part of Ca or La may be substituted with at least one selected from rare earth elements, Y, and ⁇ . . It can also be allowed as an inevitable impurity.
- Co is also an essential element, but part of Fe or Co may be substituted with at least one element selected from Zn, Ni, and Mn to an extent that does not deteriorate the magnetic properties. It can also be accepted as an inevitable impurity. Furthermore, elements other than those mentioned above that are inevitably mixed as impurities can be tolerated.
- X represents the content of La, and is preferably 0.4 ⁇ x ⁇ 0.6. This is because B and H decrease when the x force is less than 0.4 and exceeds 0.6. The more preferred range is 0.45 ⁇ x ⁇ 0.58 r cj
- x ' represents the Sr content, and preferably 0.01 ⁇ ⁇ ' ⁇ 0.3.
- ⁇ ′ is less than 0.01, the heel and haze decrease and the crystal refinement and the aspect ratio cj in the calcined body to be described later
- y represents the Co content, and 0.2 ⁇ y ⁇ 0.45 force is preferable.
- the preferred range of y is a force considered to be 0.4 to 0.6.
- Patent Document 3 when a part of Ca is substituted with Sr, y is 0. 4 to 0.6 caused a drop in H
- the range of y is in the range of 0.2 ⁇ y ⁇ 0.45, more preferably in the range of 0.25 ⁇ y ⁇ 0.4, and the ratio of X and y is xZy ⁇ l, preferably xZy ⁇ l .3, more preferably xZy ⁇ l .38, and by containing more X than y, there is no decrease in H even if y is increased.
- the molar ratio n that defines the ratio of Ca, La, Sr to Fe, Co is preferably 5.2 ⁇ n ⁇ 5.8. In this range, preferable B and H can be obtained. The preferred range is 5.2 ⁇ n ⁇ 5.5
- r cj It is.
- n is in the range 5.3 ⁇ n ⁇ 5.5 and x and y are in the above preferred ranges
- B 0.45T or more
- H 360kA / m (4.5kOe) or more, especially In the preferred range, r cj
- n tends to increase in a preferable value as x 'increases.
- n is preferably about 5.3.
- n is preferably 5.4 to 5.5.
- raw material powders such as CaCO, La 2 O, SrCO, Fe 2 O, and Co 2 O are prepared.
- the powder is blended so that x, x ′, y, and n are in the preferred ranges based on the above composition formula.
- the raw material powder may be in a solution state such as hydroxide, nitrate, chloride, etc. in addition to oxide and carbonate.
- raw material powders other than CaCO, La 2 O, SrCO, and Fe 2 O are used as raw materials.
- H BO is effective in improving B and H. Amount of added calories when adding H BO
- the raw material powder may be mixed in a wet or dry process! When the raw material powder is stirred together with a medium such as a steel ball, it can be mixed more uniformly. If wet, use water as solvent Is used.
- a known dispersant such as polycarboxylic acid ammonium or dalconic acid calcium may be used.
- the mixed raw material slurry is dehydrated to become a mixed raw material powder.
- the mixed raw material powder is heated using a rotary kiln, electric furnace, gas furnace or the like, and a magnetoplumbite type ferrite compound is formed by a solid phase reaction. This process is called “calcination” and the resulting compound is called “calcination”.
- the calcination step may be performed in an atmosphere at least having an oxygen concentration of 5% or more.
- a ferrite phase is formed by a solid-phase reaction as the temperature rises, and is completed at about 1100 ° C. Below this temperature, unreacted a-Fe 2 O remains and the magnet properties
- the calcination temperature is preferably more than 1100 ° C and not more than 1400 ° C. More preferred is 1150 to 1300. Further, the calcining time is not particularly limited, but 0.5 to 5 hours is a preferable range.
- the calcined body obtained by the calcining step is an oxide magnetic material of the present invention having a main phase of ferrite having a hexagonal crystal structure represented by the following chemical formula.
- the calcined body obtained as described above has an aspect ratio (length 1Z thickness d) of 3 or less, more preferably 2 or less, as shown in Examples described later, and Crystals with a small particle size occupy the majority. From the fact that x, x ', y, and n described above are set to optimum regions and, as a result, the crystals in the calcined body become smaller and the aspect ratio becomes smaller, the acid oxide according to the present invention.
- the magnetic material is considered to exhibit high B and high H r cj available.
- a magnetic powder By pulverizing and / or crushing such a calcined body, a magnetic powder can be obtained, which can be applied to a bond magnet or a magnetic recording medium.
- the above calcined body can be produced by a known production technique such as a spray pyrolysis method or a coprecipitation method.
- the magnetic powder When the magnetic powder is applied to a bonded magnet, the magnetic powder is mixed with a flexible rubber, hard light plastic, or the like, and then molded.
- the molding process may be performed by methods such as injection molding, extrusion molding, and roll molding.
- the magnetic powder when it is applied to a bonded magnet, it is preferably heat-treated at a temperature range of 700 ° C. to 1100 ° C. for about 0.1 to 3 hours in order to reduce crystal distortion of the magnetic powder.
- a more preferable temperature range is 900 ° C to 1000 ° C.
- a coating type magnetic recording medium is prepared. can do.
- a thin film magnetic layer used for a magnetic recording medium can be formed by a sputtering method or the like using the oxide magnetic material of the present invention and a sintered magnet using the same as a target.
- the calcined body is finely pulverized into fine particles by a vibration mill, a ball mill, Z or an attritor.
- the average particle size of the fine particles is preferably about 0.4 to 0.8 m (air permeation method).
- the fine pulverization step may be either dry pulverization or wet pulverization, but is preferably performed in combination.
- an aqueous solvent such as water or various non-aqueous solvents (for example, organic solvents such as acetone, ethanol, xylene) can be used.
- a slurry in which the solvent and the calcined body are mixed is generated. It is preferable to add various known dispersants and surfactants to the slurry in a solid content ratio of 0.2% by mass to 2.0% by mass.
- the slurry is preferably dehydrated and dried.
- the calcined body with a calcined body composition of 5.2 ⁇ n ⁇ 5.8 is CaCO 1.
- the sintered body composition is 4.3 ⁇
- the sintered body composition is the same as that of the calcined body.
- n in the sintered body composition is the lower limit when additive is added and the upper limit when no additive is added. 4.3 ⁇ n ⁇ 5.8. This is called “sintered body composition” corresponding to the calcined body composition. However, hereinafter, in the case where nothing is displayed, it is all expressed in the calcined body composition.
- the ratio of x, x ′, y in the composition varies from the ratio of x, x ′, y in the calcined body.
- n which indicates the molar ratio of Ca site to Fe site, fluctuates to the smaller n and becomes 4.3 ⁇ n ⁇ 5.8. y also varies less as n varies.
- the sintered magnet in the present invention is a sintered magnet in the present invention. Therefore, the sintered magnet in the present invention is a sintered magnet in the present invention.
- a sintered magnet having a hexagonal structure ferrite as a main phase The metal element contained in the sintered magnet is represented by the formula Ca La Sr Fe Co.
- press molding is performed in a magnetic field or in a non-magnetic field while removing the solvent in the slurry.
- the crystal orientation of the powder particles can be aligned. Magnetic properties can be dramatically improved by press molding in a magnetic field.
- a dispersant and a lubricant may be added from 0.01 to L: 0% by mass.
- the molded body obtained by press molding is subjected to a degreasing step as necessary, followed by a sintering step.
- the sintering process is performed using an electric furnace, a gas furnace, or the like.
- the sintering step can be performed in the air.
- the oxide magnetic material of the present invention can obtain high B and high H by firing in the atmosphere.
- the sintering temperature is preferably 1150 ° C to 1250 ° C.
- the sintering time is preferably 0.5 to 2 hours.
- the average crystal grain size of the sintered magnet obtained by the sintering process is about 0.5-4 / ⁇ ⁇ .
- a ferrite sintered magnet product is finally completed through known manufacturing processes such as a processing step, a cleaning step, and an inspection step.
- the CaCO powder is 0.6% by mass in terms of CaO, and the SiO powder is 0%.
- a sintered magnet was produced in the same manner as in Example 1 except that it was set to ⁇ 5.8.
- Fig. 2 shows the measurement results of residual magnetic flux density B and coercivity H of the obtained sintered magnet.
- Figure 3 shows the measurement results of residual magnetic flux density B and coercive force H of the obtained sintered magnet.
- a sintered magnet was produced in the same manner as in Example 1 except that the content was changed to 2 to 5.5.
- Figure 4 shows the measurement results of residual magnetic flux density B and coercivity H of the obtained sintered magnet.
- a sintered magnet was produced in the same manner as in Example 1 except that it was set to ⁇ 5.7.
- Figure 5 shows the measurement results of residual magnetic flux density B and coercivity H of the obtained sintered magnet.
- a sintered magnet was produced in the same manner as in Example 1 except that it was set to ⁇ 5.9.
- Figure 6 shows the measurement results of residual magnetic flux density B and coercivity H of the obtained sintered magnet.
- Examples 4 and 5 and Comparative Example 6 are examples in which x '(Sr) was changed.
- the preferred value of n tends to increase as x ′ increases.
- a sintered magnet was produced in the same manner as in Example 1 except that the sintering temperature was 1190 ° C.
- Fig. 7 shows the measurement results of residual magnetic flux density B and coercivity H of the obtained sintered magnet.
- a sintered magnet was produced in the same manner as in Example 1, except that the calcining temperature was 1150 to 1300.
- Figure 8 shows the measurement results of residual magnetic flux density B and coercivity H of the obtained sintered magnet.
- a sintered magnet was produced in the same manner as in Example 1 except that the calcining temperature was 1150 ° C to 1250 ° C.
- Fig. 9 shows the measurement results of residual magnetic flux density B and coercive force H of the obtained sintered magnet.
- a calcined body was prepared in the same manner as in Example 1 except for the above, and SEM observation was performed. The results are shown in Fig. 11.
- the calcined body according to the present invention has a substantially spherical crystal with an aspect ratio (length 1Z thickness d) l having a diameter of 1 ⁇ m to 8 ⁇ m. Occupies the majority.
- Example 11 except that 0.2% by mass of H BO was added to the raw material powder before wet ball milling.
- the oxide magnetic material of the present invention has a residual magnetic flux density B and a coercive force H both of which are the conventional SrLaC.
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Abstract
Description
Claims
Priority Applications (8)
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BRPI0620713-8A BRPI0620713B1 (pt) | 2005-12-28 | 2006-12-26 | “Material magnético de óxido, seu meio de gravação magnético, seu ímã combinado, sua máquina rotativa e ímã magnético sinterizado” |
CN2006800498932A CN101351853B (zh) | 2005-12-28 | 2006-12-26 | 氧化物磁性材料 |
EP18182479.8A EP3467828A1 (en) | 2005-12-28 | 2006-12-26 | Method of preparing a sintered magnet |
KR1020087015520A KR101347851B1 (ko) | 2005-12-28 | 2006-12-26 | 산화물 자성 재료 |
EP06843243A EP1968077A4 (en) | 2005-12-28 | 2006-12-26 | MAGNETIC OXIDE MATERIAL |
JP2007552931A JP4254897B2 (ja) | 2005-12-28 | 2006-12-26 | 酸化物磁性材料 |
KR1020137029131A KR102215944B1 (ko) | 2005-12-28 | 2006-12-26 | 소결 자석 및 산화물 자성 재료 |
US12/145,703 US8206606B2 (en) | 2005-12-28 | 2008-06-25 | Oxide magnetic material |
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US12/145,703 Continuation US8206606B2 (en) | 2005-12-28 | 2008-06-25 | Oxide magnetic material |
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JP (1) | JP4254897B2 (ja) |
KR (2) | KR101347851B1 (ja) |
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Also Published As
Publication number | Publication date |
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BRPI0620713A2 (pt) | 2011-11-22 |
KR102215944B1 (ko) | 2021-02-15 |
US8206606B2 (en) | 2012-06-26 |
EP2378519A1 (en) | 2011-10-19 |
KR20130128484A (ko) | 2013-11-26 |
CN101351853B (zh) | 2013-07-17 |
BRPI0620713B1 (pt) | 2018-07-03 |
KR101347851B1 (ko) | 2014-01-03 |
EP1968077A4 (en) | 2009-04-15 |
US20090261288A1 (en) | 2009-10-22 |
EP1968077A1 (en) | 2008-09-10 |
EP3467828A1 (en) | 2019-04-10 |
KR20080081935A (ko) | 2008-09-10 |
JP4254897B2 (ja) | 2009-04-15 |
CN101351853A (zh) | 2009-01-21 |
JPWO2007077811A1 (ja) | 2009-06-11 |
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