WO2002085810A1 - Procede de fabrication d'aimants du type ferrite - Google Patents
Procede de fabrication d'aimants du type ferrite Download PDFInfo
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- WO2002085810A1 WO2002085810A1 PCT/FR2002/001378 FR0201378W WO02085810A1 WO 2002085810 A1 WO2002085810 A1 WO 2002085810A1 FR 0201378 W FR0201378 W FR 0201378W WO 02085810 A1 WO02085810 A1 WO 02085810A1
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- Prior art keywords
- raw material
- particle size
- equal
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- raw materials
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 75
- 239000002245 particle Substances 0.000 claims abstract description 61
- 238000006467 substitution reaction Methods 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 6
- 238000001238 wet grinding Methods 0.000 claims description 6
- 230000005347 demagnetization Effects 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910052712 strontium Inorganic materials 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 239000012736 aqueous medium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000007970 homogeneous dispersion Substances 0.000 claims description 2
- 229910052745 lead Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 6
- 229910020599 Co 3 O 4 Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 108020001568 subdomains Proteins 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910004762 CaSiO Inorganic materials 0.000 description 1
- 102100035971 Molybdopterin molybdenumtransferase Human genes 0.000 description 1
- 101710119577 Molybdopterin molybdenumtransferase Proteins 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
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- 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
-
- 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
-
- 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
- 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
- C01G49/0036—Mixed oxides or hydroxides containing one alkaline earth metal, magnesium or lead
-
- 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
- C01G49/0063—Mixed oxides or hydroxides containing zinc
-
- 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
- C01G49/0072—Mixed oxides or hydroxides containing manganese
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G51/00—Compounds of cobalt
- C01G51/006—Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen
-
- 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
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, 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
- C04B35/01—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
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
-
- 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
- C04B35/2641—Compositions containing one or more ferrites of the group comprising rare earth metals and one or more ferrites of the group comprising alkali metals, 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
- C04B35/01—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
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- 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
- C01P2002/52—Solid solutions containing elements as dopants
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- 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
- C01P2006/42—Magnetic properties
Definitions
- the invention relates to the field of permanent magnets, and more particularly ferrite type magnets comprising the magnetoplumbite phase.
- the present invention relates to permanent magnets of ferrite type based on the magnetoplumbite phase of formula M Fe 12 O 19 with M equal to Sr, Ba, etc., in which the element M is partially substituted by an element R, chosen among rare earths or bismuth, and in which the element Fe is partially substituted by at least one transition metal T.
- Such magnets are already known to have high magnetic properties, as disclosed in Japanese application J10-149910 or in European application EP-0 905 718 or in international application WO99 / 34379. In these applications, it is common to use lanthanum La as element R, and cobalt Co as element T.
- the manufacture of such magnets comprises the following stages: a) formation of a mixture of the raw materials either by a wet process to form a dispersion, or by a dry process to form granules, b) calcination of the mixture around 1250 ° C.
- a clinker, or chamotte comprising the desired magnetoplumbite phase, said mixture, either in the form of a dispersion or of granules, being introduced into a calcination oven, c) wet grinding of the clinker until an aqueous dispersion of particles is obtained with a particle size close to 1 ⁇ m, in the form of a paste with around 70% dry extract, d) the paste is concentrated and compressed under an orienting magnetic field of approximately 1 Tesla and under a pressure of 30 to 50 MPa so as to obtain a green tablet, called "green compact" in English, anisotropic and 87% extract dry, e) after drying and removal of the remaining water, sintering of the green tablet, f) final machining to obtain the magnet of predetermined shape.
- the object of the invention is a method for simultaneously achieving these goals, as well as the magnets obtained by this method. DESCRIPTION OF THE INVENTION
- a mixture MP of the raw materials MP M , MP F , MP R and MP T relating respectively to the elements M, Fe, R and T, typically in the form of powders, is formed in a mixing means, typically a mixer operating batchwise of oxide, carbonate or hydroxide, consisting of particles P, denoted respectively P M , PR, PF and P_, the raw material MP F relating to the element Fe, typically iron oxide Fe 2 O 3 , and the raw material MP M constituting so-called main raw materials, the raw materials MP R and MP T constituting raw materials MPs
- c) wet grinding of said clinker is carried out, typically in a dispersing apparatus in an aqueous medium, to obtain a homogeneous dispersion C of fine deagglomerated particles with an average particle size of less than 1.2 ⁇ m, d) concentrates and compresses said particles under orienting magnetic field to form a tablet with green D, anisotropic, manipulable and of predetermined shape, e) sintering said tablet with green D anisotropic to obtain a sintered element E, f) optionally carrying out final dimensions of said sintered element E, typically by machining.
- This process is characterized in that, in the mixture MP in step a) of the process, at least one of the substitution raw materials MP R OR MP T has a particle size Gs, typically measured by the BET specific surface in m 2 / g and specifically noted GR OR GT for respectively the substitute raw materials MPR OR MPT, chosen according to the particle size G F of the main raw material MP F and according to the mass percentage% S of said raw material of substitution MPs with respect to said main raw material MP F taking into account said formula of ferrite M ⁇ -X R x Fe 12-y T y O 19 , so as to obtain a mixture MP comprising, statistically and ideally, whatever the formula of ferrite, a predetermined proportion of particles P R OR P T compared to those of particles P F.
- Gs typically measured by the BET specific surface in m 2 / g and specifically noted GR OR GT for respectively the substitute raw materials MPR OR MPT, chosen according to the particle size G F of the main raw material MP F and according to the mass percentage% S of said
- the Applicant has recognized the importance of the relative GR and / or Gr particle size of the alternative raw materials considered in relation to both the GF particle size of the ferric oxide constituting the main raw material MP F , and with the composition of ferrite which varies with the substitution indices x and y in the formula of ferrite M 1-x R x Fe 12-y T y O 19 .
- the Applicant has observed significant increases in the ratio b. ⁇ , all other things being equal, both with regard to the manufacturing process which is not found to be substantially modified, as with regard to the final properties of the magnets ferrites. Indeed, as the tests will show, it is remarkable to note that the method according to the invention not only makes it possible to obtain high values of the hK ratio but also that it also retains the high levels reached for the magnetic induction Br and the coercive field HcJ, which is particularly interesting in practice.
- FIG. 1 is a diagram indicating the particle sizes G R on the abscissa and G ⁇ on the ordinate - expressed in m 2 / g, of the various tests 1 to 4.
- FIG. 2 is a recording of the square character for magnets obtained according to the different tests 1 to 4.
- G F denoting the particle size of the main raw material MP F , namely ferric oxide, the constant K s being equal to (100 /% S) 1 3 . (dp / ds) 273 , d F and d s .
- sub-domains are also defined, such as the set of domains A + B + C defined by the unique condition G R > 2.53GF in which tests 2 and 3 are situated, or even the set domains A + D + G defined by the unique condition G ⁇ > 3.38GF in which trials 2 and 4 are situated.
- the particle size Gs of at least one substitution raw material MPs can be at least equal to 0.7. GS T H; OR also at least equal to 0.8, or also at least equal to 0.9, and preferably at least equal to G STH .
- Said particle size Gs can correspond to the particle size G R of the substitution raw material MP R.
- said particle size Gs may correspond to the particle size Gr of the substitute raw material MPT-
- G ⁇ > G ⁇ H 3.38G F
- the set of domains B + E + H is defined by the unique condition 0.7.
- said particle size G s can correspond simultaneously to the particle size GR of the substitute raw material MP R and to the particle size G ⁇ of the substitute raw material MP T.
- a preferred domain is thus defined, domain A in FIG. 1, and sub-domains B, D and E for which at least one substitution raw material is such that 0.7 G OR _TH ⁇ G R and / or G s ⁇ G OR TTH -
- the particle size G F of the raw material MP F can be between 1 and 10 m 2 / g.
- the invention is not limited to a particular formula of magnetoplumbite type ferrite, by the nature of the elements M, R and T in the general formula of ferrite indicated above.
- the method according to the invention can be applied to the manufacture of any ferrite in any one of claims 1 to 10 in which the values of x and of y relating respectively to the element R and to the element T can range from 0.05 to 0.5, and preferably from 0.10 to 0.25.
- the element R can be chosen equal to La and the element T can be chosen equal to Co.
- the constant K is taken equal to 3.38 for the substitution element T equal to cobalt, and the constant K is taken equal to 2.53 for the substitution element R taken equal to lanthanum.
- Another subject of the invention comprises the ferrite magnets obtained by the method of the invention.
- the performance index DP Br + 0.5.HcJ, with Br in mT and HcJ in kA.m '1 , is at least equal at 580, and preferably greater than 590, at least equal to 595
- the square character h ⁇ Hk HcJ in% of the demagnetization curve, with Hk and HcJ being expressed in kA.m "1 and with Hk being equal at H (Br-10%), is at least equal to 0.89, and preferably greater than 0.90, or even greater than 0.92.
- raw material MP M Also used as raw material MP M , source of the element Sr, strontium carbonate SrCO 3 in powder of specific surface equal to 1.38 m 2 / g.
- source of the element Sr, strontium carbonate SrCO 3 in powder of specific surface equal to 1.38 m 2 / g.
- Test 1 is to be considered as a test belonging to the state of the art.
- the manufacturing process comprises the following stages: a) a wet-phase mixing was carried out for 2 hours, so as to obtain a homogeneous mixture, b) after having isolated and dried the mixture formed, the mixture was calcined at 1250 ° C for 2 h in an oven, to form a ferrite clinker, c) the clinker was finely ground with the incorporation of additives (1% by weight of CaSiO 3 and 0.94% by weight of SrCO 3 ), in two stages: during a first stage, wet grinding was carried out for 9 hours with 6 mm balls, and during a second stage, wet grinding was carried out for 7 hours with 3 mm balls , 2 mm.
- Hk The values of Hk are plotted on FIG. 3 on the ordinate (in kA.ni "1 ) and on the abscissa the different tests 1 to 4, also spaced and ordered so as to have Hk increasing from one test to the next.
- the curve marked "MP R " relating to the element La, passes through the lower point ("black” diamond) with ordinate 0.875 and abscissa "-" because the average of h K of the two tests - tests 1 and 4 - in which the raw material MP R relating to the element La has a "low” particle size is worth: (0.86 + 0.89) / 2, or 0.875.
- the preponderant influence of the particle size of the raw material relative to the element La compared to that of the element Co could be explained by the differences in size and atomic weight between the two elements Co and La.
- the results obtained could be explained if one considers the speed of diffusion of the various chemical elements necessary for the synthesis of ferrite: the influence of the particle size would be all the greater as the chemical element in question would be cumbersome and large, so that the lower intrinsic diffusion would somehow be "compensated" for by a smaller particle size.
- G TTH 3.38.
- Q F 12.33 m 2 / g and ordinate equal to 0.7.
- the preferred domain of the invention is defined by the double condition G ⁇ > G TTH and GR> G RTH , domain A corresponding to the rectangle with crossed lines at the top right of Figure 1, while the domain excluded from l
- the invention is defined by the double condition G ⁇ 0.77GTTH and GR ⁇ 0.77G RT H, area corresponding to the "white" rectangle at the bottom left of Figure 1.
- domains noted B to H in FIG. 1 there are different intermediate domains, domains noted B to H in FIG. 1.
- domain C of test 3 is preferable to domain G of test 4.
- the invention has the following advantages: - on the one hand, it can be applied to all magnets of the ferrite type.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02735479A EP1381578A1 (fr) | 2001-04-25 | 2002-04-23 | Procede de fabrication d'aimants du type ferrite |
MXPA03009726A MXPA03009726A (es) | 2001-04-25 | 2002-04-23 | PROCESO DE FABRICACIoN DE IMANES DE TIPO FERRITA. |
BR0209180-1A BR0209180A (pt) | 2001-04-25 | 2002-04-23 | Processo de fabricação de ìmãs do tipo ferrita |
JP2002583347A JP3990291B2 (ja) | 2001-04-25 | 2002-04-23 | フェライトタイプの磁石の製造方法 |
KR1020037013966A KR100870690B1 (ko) | 2001-04-25 | 2002-04-23 | 페라이트 자석의 제조 방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0105569A FR2824178B1 (fr) | 2001-04-25 | 2001-04-25 | Procede de fabrication d'aimants du type ferrite |
FR0105569 | 2001-04-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002085810A1 true WO2002085810A1 (fr) | 2002-10-31 |
Family
ID=8862678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/001378 WO2002085810A1 (fr) | 2001-04-25 | 2002-04-23 | Procede de fabrication d'aimants du type ferrite |
Country Status (9)
Country | Link |
---|---|
US (1) | US6811718B2 (fr) |
EP (1) | EP1381578A1 (fr) |
JP (1) | JP3990291B2 (fr) |
KR (1) | KR100870690B1 (fr) |
CN (1) | CN1330605C (fr) |
BR (1) | BR0209180A (fr) |
FR (1) | FR2824178B1 (fr) |
MX (1) | MXPA03009726A (fr) |
WO (1) | WO2002085810A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115974258A (zh) * | 2023-01-10 | 2023-04-18 | 安徽工业大学 | 一种去除水体中腐殖酸的方法 |
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CN1937121B (zh) * | 2006-09-21 | 2010-04-14 | 上海大学 | 复相纳米晶永磁铁氧体材料的制备方法 |
KR101082389B1 (ko) | 2011-05-31 | 2011-11-11 | 쌍용머티리얼 주식회사 | 마그네토플럼바이트형 페라이트 자성재료 및 이로부터 유도된 세그멘트형 영구자석 |
CN102731080B (zh) * | 2012-07-13 | 2014-03-12 | 当涂县海川磁性材料有限公司 | 一种制备铁氧体磁性材料用的粉料加工方法 |
JP6680762B2 (ja) | 2014-08-29 | 2020-04-15 | エコラボ ユーエスエー インコーポレイティド | ポリアクリル酸を含む固体すすぎ補助組成物 |
CN104446412A (zh) * | 2014-11-14 | 2015-03-25 | 连云港市兆昱新材料实业有限公司 | 一种基于钕铁硼废料生产的高性能永磁铁氧体预烧料及制备方法 |
CN115215643A (zh) * | 2022-07-21 | 2022-10-21 | 成都信息工程大学 | 一种Nd-Co共取代M型锶铁氧体及其制备方法 |
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EP0905718A1 (fr) * | 1997-02-25 | 1999-03-31 | TDK Corporation | Materiau magnetique a base d'oxyde, particule de ferrite, aimant obtenu par frittage, aimant issu d'une liaison, support d'enregistrement magnetique et moteur |
FR2784498A1 (fr) * | 1999-11-30 | 2000-04-14 | Ugimag Sa | Procede de fabrication d'aimants du type ferrite |
FR2785281A1 (fr) * | 1999-07-05 | 2000-05-05 | Ugimag Sa | Procede de fabrication de poudres ou biscuits d'hexaferrites de type m |
-
2001
- 2001-04-25 FR FR0105569A patent/FR2824178B1/fr not_active Expired - Fee Related
-
2002
- 2002-04-09 US US10/118,451 patent/US6811718B2/en not_active Expired - Fee Related
- 2002-04-23 EP EP02735479A patent/EP1381578A1/fr not_active Withdrawn
- 2002-04-23 WO PCT/FR2002/001378 patent/WO2002085810A1/fr not_active Application Discontinuation
- 2002-04-23 CN CNB028088263A patent/CN1330605C/zh not_active Expired - Fee Related
- 2002-04-23 BR BR0209180-1A patent/BR0209180A/pt not_active Application Discontinuation
- 2002-04-23 KR KR1020037013966A patent/KR100870690B1/ko not_active IP Right Cessation
- 2002-04-23 MX MXPA03009726A patent/MXPA03009726A/es active IP Right Grant
- 2002-04-23 JP JP2002583347A patent/JP3990291B2/ja not_active Expired - Fee Related
Patent Citations (3)
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EP0905718A1 (fr) * | 1997-02-25 | 1999-03-31 | TDK Corporation | Materiau magnetique a base d'oxyde, particule de ferrite, aimant obtenu par frittage, aimant issu d'une liaison, support d'enregistrement magnetique et moteur |
FR2785281A1 (fr) * | 1999-07-05 | 2000-05-05 | Ugimag Sa | Procede de fabrication de poudres ou biscuits d'hexaferrites de type m |
FR2784498A1 (fr) * | 1999-11-30 | 2000-04-14 | Ugimag Sa | Procede de fabrication d'aimants du type ferrite |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115974258A (zh) * | 2023-01-10 | 2023-04-18 | 安徽工业大学 | 一种去除水体中腐殖酸的方法 |
CN115974258B (zh) * | 2023-01-10 | 2023-10-17 | 安徽工业大学 | 一种去除水体中腐殖酸的方法 |
Also Published As
Publication number | Publication date |
---|---|
FR2824178A1 (fr) | 2002-10-31 |
CN1561316A (zh) | 2005-01-05 |
KR100870690B1 (ko) | 2008-11-27 |
JP3990291B2 (ja) | 2007-10-10 |
JP2004532524A (ja) | 2004-10-21 |
EP1381578A1 (fr) | 2004-01-21 |
KR20040023795A (ko) | 2004-03-19 |
CN1330605C (zh) | 2007-08-08 |
US20030052300A1 (en) | 2003-03-20 |
US6811718B2 (en) | 2004-11-02 |
FR2824178B1 (fr) | 2003-05-30 |
BR0209180A (pt) | 2004-08-03 |
MXPA03009726A (es) | 2004-01-29 |
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