CN109836147B - Permanent magnetic ferrite and preparation method thereof - Google Patents
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Abstract
The invention relates to the technical field of permanent magnetic ferrite materials, and provides a permanent magnetic ferrite and a preparation method thereof for solving the problems that the traditional permanent magnetic ferrite material depends on higher Co addition and has high cost, wherein the permanent magnetic ferrite is composed of 55wt% or more of Sr series ferrite materials and 45wt% or less of Ca series ferrite materials on the basis of the total mass of the permanent magnetic ferrite; the Sr-based ferrite material has Sr1‑xLaxFe3+ 2n‑yCoyO19A ferrite primary phase; the Ca-based ferrite material contains Cax(Sr+Ba)yLa1‑x‑yFe3+ 2n‑ zCozO19A ferrite main phase. The invention forms a new ferrite main phase material by compounding two or more pre-sintering materials with different ferrite main components after secondary ball milling and molding sintering; meanwhile, the addition amount of Co is reduced, and the optimal magnetic performance and cost performance are obtained. The preparation process is simple to operate, has no special requirements on equipment, and is easy for large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of permanent magnetic ferrite materials, in particular to a permanent magnetic ferrite and a preparation method thereof.
Background
As a permanent magnet material formed of an oxide, hexagonal M-type (magnetoplumbite-type) Sr ferrite is well known. In recent years, as electronic parts have been reduced in size and improved in performance, permanent magnetic ferrite materials are also required to have high performance. Generally, the performance of the permanent magnetic ferrite can be remarkably improved by adding lanthanum and cobalt ions for replacement, and particularly, the rapid development of ternary materials of new energy automobiles raises the price of cobalt oxides, so that the cost of ferrite materials is increased. Therefore, how to reduce the addition amount of Co and obtain excellent magnetic properties is a hot research and development focus of high-performance magnetic materials at present.
Disclosure of Invention
In order to overcome the problems that the traditional permanent magnetic ferrite material depends on higher Co addition amount and has high cost, the invention provides the permanent magnetic ferrite formed by compounding two or more different ferrite main phases, and simultaneously reduces the Co addition amount to obtain the optimal magnetic performance and cost performance.
The invention also provides a preparation method of the permanent magnetic ferrite, which is simple to operate, has no special requirements on equipment and is easy for large-scale industrial production.
In order to achieve the purpose, the invention adopts the following technical scheme:
a permanent magnetic ferrite characterized by being composed of 55wt% or more of a Sr-based ferrite material and 45wt% or less of a Ca-based ferrite material, based on the total mass of the permanent magnetic ferrite; the Sr-based ferrite material has Sr1-xLaxFe3+ 2n-yCoyO19A ferrite primary phase; the Ca-based ferrite material contains Cax(Sr+Ba)yLa1-x-yFe3 + 2n-zCozO19A ferrite main phase.
Preferably, in the Sr-based ferrite material: x is more than or equal to 0.1 and less than or equal to 0.4, y is more than or equal to 0.05 and less than or equal to 0.35, and n is more than or equal to 5.8 and less than or equal to 6.1.
Preferably, the addition amount of the oxides corresponding to the Ca-based ferrite material is, based on the total amount of Ca-based ferrite material: fe2O3 80～90mol％，CaCO3 3.0～6.2mol％，La2O32.5 to 5.5 mol% and Co2O31.8-3.4 mol%, and the balance of BaCO3And/or SrCO3(ii) a Wherein n is more than or equal to 5.0 and less than or equal to 5.5.
The preparation method of the permanent magnetic ferrite is characterized by comprising the following steps of:
(1) preparing an Sr-series ferrite material: weighing Fe according to the proportion2O3，La2O3，Co2O3And SrCO3Carrying out wet primary ball milling to obtain first slurry, drying, pre-pressing and pre-burning the first slurry to obtain first pre-burning materials, and then carrying out dry coarse crushing treatment on the first pre-burning materials to obtain Sr ferrite materials;
(2) preparing a Ca-based ferrite material: weighing Fe according to the proportion2O3，CaCO3，La2O3，Co2O3，SrCO3And BaCO3Adding an abrasive, performing wet primary ball milling to obtain second slurry, drying the second slurry, performing pre-pressing treatment, and pre-sintering to obtain a second pre-sintered material; then the second pre-sintering material is subjected to dry type coarse crushing treatment to obtain Ca series ironAn ferrite material;
(3) respectively weighing the Sr ferrite material prepared in the step (1) and the Ca ferrite material prepared in the step (2) according to the proportion, and simultaneously adding SiO2、CaCO3Putting the mixture of the calcium gluconate and the calcium gluconate into a ball mill, controlling the ball milling time to be 20-30 h, and adding deionized water as a ball milling medium for grinding to obtain mixed slurry;
(4) centrifugally dewatering the mixed slurry prepared in the step (3), and performing compression molding to obtain a molded body;
(5) and carrying out heat treatment on the formed body at the temperature of 100-600 ℃, and then sintering in an air atmosphere to obtain the permanent magnetic ferrite.
The invention forms a new ferrite main phase material by compounding two or more pre-sintering materials with different ferrite main components after secondary ball milling and molding sintering; meanwhile, the addition amount of Co is reduced, and the optimal magnetic performance and cost performance are obtained.
Preferably, in the step (1), the time of wet primary ball milling is controlled to be 5-10 h; the granularity of the first slurry is controlled to be 0.05-0.6 mu m; controlling the pressure of the pre-pressing treatment to be 5-10 MPa; controlling the pre-sintering temperature to be 1200-1250 ℃; the particle size of the Sr ferrite material is controlled to be 2.0-3.0 μm.
Preferably, in the step (2), the time of the wet primary ball milling is controlled to be 5-10 h; the granularity of the second slurry is controlled to be 0.05-0.6 mu m; controlling the pressure of the pre-pressing treatment to be 5-10 MPa; controlling the pre-sintering temperature to be 1250-1300 ℃; the particle size of the Ca-based ferrite material is controlled to be 2.0-3.0 μm.
Preferably, in the step (3), the particle size of the mixed slurry is controlled to be 0.5 to 0.7 μm.
Preferably, in the step (4), the concentration of the mixed slurry after the centrifugal dehydration is 50 to 70 wt%.
Preferably, in the step (4), the magnetic field of the press molding is controlled to be 14000-15000 Oe.
Preferably, in the step (5), the temperature rise rate in the sintering process is 100-150 ℃/h, the sintering temperature is 1200-1210 ℃, and the sintering time is controlled to be 70-90 min.
Preferably, in the step (2), the abrasive is boric acid, and the addition amount of the boric acid in the mixed raw material is 0.1 to 0.2 wt%.
Therefore, the invention has the following beneficial effects: two or more pre-sintering materials with different ferrite main components are subjected to secondary ball milling, molding and sintering to form a new ferrite main phase material; meanwhile, the addition amount of Co is reduced, and the optimal magnetic performance and cost performance are obtained. The preparation process is simple to operate, has no special requirements on equipment, and is easy for large-scale industrial production.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples.
In the present invention, all the equipment and materials are commercially available or commonly used in the art, and the methods in the following examples are conventional in the art unless otherwise specified.
Example 1
(1) Preparing an Sr-series ferrite material: according to Sr0.6La0.4Fe11.6Co0.3O19Weighing Fe according to the main phase ratio of ferrite2O3(purity not less than 99.3 wt%, Cl)-Not more than 0.1 wt%, original average particle size of the particles is not more than 1.5 μm), La2O3(purity is more than or equal to 99.3 wt%, and original average particle size of particles is less than or equal to 5 mu m), Co2O3(Co content is more than or equal to 72 wt%, original average particle size of particles is less than or equal to 3 mu m) and SrCO3Carrying out wet primary ball milling to obtain first slurry (the purity is more than or equal to 97 wt%, and the original average particle size of particles is less than or equal to 1.5 mu m), controlling the particle size of the first slurry to be 0.56 mu m, carrying out ball milling for 10h, drying the first slurry, carrying out pre-pressing treatment under the pressure of 10Mpa, then carrying out pre-sintering at 1230 ℃ in air atmosphere to obtain a first pre-sintered material, and carrying out dry coarse crushing treatment on the first pre-sintered material to obtain a Sr ferrite material with the average particle size of 2.5 mu m;
(2) preparing a Ca-based ferrite material: according to Sr0.1Ba0.06Ca0.38La0.46Fe9.92Co0.28O19Proportioning and weighing Fe2O3(purity not less than 99.3 wt%, Cl)-Not more than 0.1 wt%, original average particle size of particles not more than 1.5 μm), CaCO3(purity is more than or equal to 98.5 wt%, and original average particle size of particles is less than or equal to 1.0 mu m), La2O3(purity is more than or equal to 99.3 wt%, original average particle size of particles is less than or equal to 5um), Co2O3(Co content is more than or equal to 72 wt%, original average particle size of particles is less than or equal to 3 mu m), SrCO3(purity is more than or equal to 97 wt%, and original average particle size of particles is less than or equal to 1.5 mu m) and BaCO3(the purity is more than or equal to 97 wt%, the original average particle size of the particles is less than or equal to 1.5 mu m), 0.2wt% of boric acid is added as a grinding agent, the first slurry is obtained by wet ball milling for 10 hours, the particle size of the second slurry is 0.55 mu m, the second slurry is dried, pre-pressed under the pressure of 10Mpa, and then pre-sintered in the air atmosphere at 1260 ℃ to obtain a second pre-sintered material; then the second pre-sintered material is subjected to dry type coarse crushing treatment to obtain a Ca-based ferrite material with the average grain size of 2.0 mu m;
(3) according to the proportion, 250g of Sr ferrite material prepared in the step (1) and 250g of Ca ferrite material prepared in the step (2) are respectively weighed, and 2.25g of SiO is added2、8.03g CaCO35.0g of calcium gluconate is put into a ball mill, the ball milling time is controlled to be 30h, and then 1000mL of deionized water is added as a ball milling medium for grinding to obtain mixed slurry with the particle size of 0.63 mu m;
(4) centrifugally dewatering the mixed slurry prepared in the step (3), adjusting the concentration of the slurry to 65 wt%, performing compression molding, and applying a molding magnetic field of 14000Oe in the compression direction to obtain a molded body; the obtained molded body is a cylinder with the diameter of 43.2mm and the height of 13mm, and the molding pressure is 5 MPa;
(5) and (3) carrying out heat treatment on the formed body at the temperature of 500 ℃, completely removing the organic dispersing agent, then sintering in the air atmosphere at the heating rate of 150 ℃/h, and carrying out heat preservation at 1210 ℃ for 90min to obtain the permanent magnetic ferrite.
Example 2
(1) Preparing an Sr-series ferrite material: according to Sr0.6La0.4Fe11.6Co0.3O19Weighing Fe according to the main phase ratio of ferrite2O3(purity of≥99.3wt％，Cl-Not more than 0.1 wt%, original average particle size of the particles is not more than 1.5 μm), La2O3(purity is more than or equal to 99.3 wt%, and original average particle size of particles is less than or equal to 5 mu m), Co2O3(Co content is more than or equal to 72 wt%, original average particle size of particles is less than or equal to 3 mu m) and SrCO3Carrying out wet primary ball milling to obtain first slurry (the purity is more than or equal to 97 wt%, and the original average particle size of particles is less than or equal to 1.5 mu m), controlling the particle size of the first slurry to be 0.6 mu m, carrying out ball milling for 10h, drying the first slurry, carrying out pre-pressing treatment under the pressure of 8Mpa, then presintering at 1200 ℃ in air atmosphere to obtain a first presintering material, and then carrying out dry coarse crushing treatment on the first presintering material to obtain a Sr ferrite material with the average particle size of 3.0 mu m; (2) preparing a Ca-based ferrite material: according to Sr0.1Ba0.06Ca0.38La0.46Fe9.92Co0.28O19Weighing Fe according to the main phase ratio of ferrite2O3(purity not less than 99.3 wt%, Cl)-Not more than 0.1 wt%, original average particle size of particles not more than 1.5 μm), CaCO3(purity is more than or equal to 98.5 wt%, and original average particle size of particles is less than or equal to 1.0 mu m), La2O3(purity is more than or equal to 99.3 wt%, original average particle size of particles is less than or equal to 5um), Co2O3(Co content is more than or equal to 72 wt%, original average particle size of particles is less than or equal to 3 mu m), SrCO3(purity is more than or equal to 97 wt%, and original average particle size of particles is less than or equal to 1.5 mu m) and BaCO3(the purity is more than or equal to 97 wt%, the original average particle size of the particles is less than or equal to 1.5 mu m), 0.2wt% of boric acid is added as a grinding agent, the first slurry is obtained by wet ball milling for 10 hours, the particle size of the second slurry is 0.6 mu m, the second slurry is dried, pre-pressed under the pressure of 5Mpa, and then pre-sintered at 1300 ℃ in the air atmosphere to obtain a second pre-sintered material; then the second pre-sintered material is subjected to dry type coarse crushing treatment to obtain a Ca-based ferrite material with the average grain size of 2.8 mu m;
(3) according to the proportion, 250g of Sr ferrite material prepared in the step (1) and 250g of Ca ferrite material prepared in the step (2) are respectively weighed, and 2.25g of SiO is added2、8.03g CaCO35.0g of calcium gluconate is put into a ball mill, the ball milling time is controlled to be 2 hours, 1000mL of deionized water is added as a ball milling medium for milling,obtaining mixed slurry with the grain diameter of 0.66 mu m;
(4) centrifugally dewatering the mixed slurry prepared in the step (3), adjusting the concentration of the slurry to 70wt%, performing compression molding, and applying a molding magnetic field of 15000Oe in the compression direction to obtain a molded body; the obtained molded body is a cylinder with the diameter of 43.2mm and the height of 13mm, and the molding pressure is 5 MPa;
(5) and (3) carrying out heat treatment on the formed body at the temperature of 600 ℃, completely removing the organic dispersing agent, then sintering in the air atmosphere at the heating rate of 100 ℃/h, and keeping the temperature at 1200 ℃ for 70min to obtain the permanent magnetic ferrite.
Example 3
(1) Preparing an Sr-series ferrite material: according to Sr0.6La0.4Fe11.6Co0.3O19Weighing Fe according to the main phase ratio of ferrite2O3(purity not less than 99.3 wt%, Cl)-Not more than 0.1 wt%, original average particle size of the particles is not more than 1.5 μm), La2O3(purity is more than or equal to 99.3 wt%, and original average particle size of particles is less than or equal to 5 mu m), Co2O3(Co content is more than or equal to 72 wt%, original average particle size of particles is less than or equal to 3 mu m) and SrCO3Carrying out wet primary ball milling to obtain first slurry (the purity is more than or equal to 97 wt%, and the original average particle size of particles is less than or equal to 1.5 mu m), controlling the particle size of the first slurry to be 0.45 mu m, carrying out ball milling for 10h, drying the first slurry, carrying out pre-pressing treatment under the pressure of 5-10 Mpa, then carrying out pre-sintering at 1240 ℃ in the air atmosphere to obtain a first pre-sintered material, and carrying out dry coarse crushing treatment on the first pre-sintered material to obtain an Sr ferrite material with the average particle size of 2.0 mu m;
(2) preparing a Ca-based ferrite material: according to Sr0.1Ba0.06Ca0.38La0.46Fe9.92Co0.28O19Weighing Fe according to the main phase ratio of ferrite2O3(purity not less than 99.3 wt%, Cl)-Not more than 0.1 wt%, original average particle size of particles not more than 1.5 μm), CaCO3(purity is more than or equal to 98.5 wt%, and original average particle size of particles is less than or equal to 1.0 mu m), La2O3(purity is more than or equal to 99.3 wt%, and original average particle size of particles is less than or equal to 5 mu m), Co2O3(Co content is more than or equal to 72 wt%, original average particle size of particles is less than or equal to 3 mu m), SrCO3(purity is more than or equal to 97 wt%, and original average particle size of particles is less than or equal to 1.5 mu m) and BaCO3(the purity is more than or equal to 97 wt%, and the original average particle size of the particles is less than or equal to 1.5 mu m), adding 0.1 wt% of boric acid as a grinding agent, carrying out wet ball milling for 10 hours to obtain first slurry, wherein the particle size of the second slurry is 0.05-0.6 mu m, drying the second slurry, carrying out pre-pressing treatment under the pressure of 5-10 Mpa, and then presintering at 1250 ℃ in an air atmosphere to obtain a second presintering material; then the second pre-sintered material is subjected to dry type coarse crushing treatment to obtain a Ca-based ferrite material with the average grain size of 2.0 mu m;
(3) according to the proportion, 250g of Sr ferrite material prepared in the step (1) and 250g of Ca ferrite material prepared in the step (2) are respectively weighed, and 2.25g of SiO is added2、8.03g CaCO35.0g of calcium gluconate is put into a ball mill, the ball milling time is controlled to be 25 hours, and then 1000mL of deionized water is added as a ball milling medium for grinding to obtain mixed slurry with the particle size of 0.67 mu m;
(4) centrifugally dewatering the mixed slurry prepared in the step (3), adjusting the concentration of the slurry to 50 wt%, performing compression molding, and applying a 14500Oe molding magnetic field in the compression direction to obtain a molded body; the obtained molded body is a cylinder with the diameter of 43.2mm and the height of 13mm, and the molding pressure is 5 MPa;
(5) and (3) carrying out heat treatment on the formed body at the temperature of 450 ℃, completely removing the organic dispersing agent, then sintering in the air atmosphere at the heating rate of 120 ℃/h, and carrying out heat preservation at 1205 ℃ for 80min to obtain the permanent magnetic ferrite.
Comparative example 1
(1) 500g of the Sr-based ferrite material obtained in the step (1) of example 1 was weighed, and 2.5g of SiO was added thereto2、6.0g CaCO35g of the mixture of calcium gluconate is put into a ball mill, 1000mL of deionized water is added as a ball milling medium for grinding for 30 hours, and the average particle size of the ground paste after ball milling is 0.62 mu m;
(2) centrifugally dewatering the slurry, adjusting the concentration of the slurry to 65 wt%, performing press forming, and applying a forming magnetic field of 14000Oe in the pressing direction to obtain a formed body; the obtained molded body is a cylinder with the diameter of 43.2mm and the height of 13mm, and the molding pressure is 5 MPa;
(3) and (3) carrying out heat treatment on the formed body at the temperature of 500 ℃, completely removing the organic dispersing agent, then sintering in the air atmosphere at the heating rate of 150 ℃/h, and carrying out heat preservation at 1210 ℃ for 90min to obtain the permanent magnetic ferrite.
Comparative example 2
(1) 500g of the Ca-based ferrite material obtained in the step (2) of example 1 was weighed, and 2.25g of SiO was added2、9.25g CaCO35g of the mixture of calcium gluconate is put into a ball mill, 1000mL of deionized water is added as a ball milling medium for grinding for 30 hours, and the average particle size of the ground paste after ball milling is 0.62 mu m;
(2) centrifugally dewatering the slurry, adjusting the concentration of the slurry to 65 wt%, performing press forming, and applying a forming magnetic field of 14000Oe in the pressing direction to obtain a formed body; the obtained molded body is a cylinder with the diameter of 43.2mm and the height of 13mm, and the molding pressure is 5 MPa;
(3) and (3) carrying out heat treatment on the formed body at the temperature of 500 ℃, completely removing the organic dispersing agent, then sintering in the air atmosphere at the heating rate of 150 ℃/h, and carrying out heat preservation at 1210 ℃ for 90min to obtain the permanent magnetic ferrite.
The upper and lower surfaces of the permanent magnetic ferrites prepared in examples 1 to 3 and comparative examples 1 and 2 were respectively ground, and the residual magnetic induction strength (Br), coercive force (Hcb), intrinsic coercive force (Hcj), and maximum magnetic energy product (BH) max were measured, and the results are shown in table 1:
TABLE 1 test results
| Numbering | Br(Gs) | Hcb(Oe) | Hcj(Oe) | (BH)max |
| Example 1 | 4450 | 3950 | 5360 | 4.56 |
| Example 2 | 4480 | 3980 | 5260 | 4.58 |
| Example 3 | 4468 | 3965 | 5285 | 4.62 |
| Comparative example 1 | 4410 | 3920 | 4520 | 4.45 |
| Comparative example 2 | 4490 | 4012 | 5320 | 4.62 |
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (4)
1. A permanent magnetic ferrite characterized by being composed of 55wt% or more of a Sr-based ferrite material and 45wt% or less of a Ca-based ferrite material, based on the total mass of the permanent magnetic ferrite; the Sr-based ferrite material has Sr0.6La0.4Fe11.6Co0.3O19A ferrite primary phase; the Ca-based ferrite material has Sr0.1Ba0.06Ca0.38La0.46Fe9.9 2Co0.28O19A ferrite primary phase;
the preparation method of the permanent magnetic ferrite comprises the following steps:
(1) preparing an Sr-series ferrite material: weighing Fe according to the proportion2O3，La2O3，Co2O3And SrCO3Carrying out wet primary ball milling to obtain first slurry, drying, pre-pressing and pre-burning the first slurry to obtain first pre-burning materials, and then carrying out dry coarse crushing treatment on the first pre-burning materials to obtain Sr ferrite materials; the granularity of the first slurry is controlled to be 0.05-0.6 mu m; the particle size of the Sr ferrite material is controlled to be 2.0-3.0 mu m;
(2) preparing a Ca-based ferrite material: weighing Fe according to the proportion2O3，CaCO3，La2O3，Co2O3，SrCO3And BaCO3Adding an abrasive, performing wet primary ball milling to obtain first slurry, drying, pre-pressing and pre-sintering the second slurry to obtain a second pre-sintered material; then the second pre-sintered material is subjected to dry type coarse crushing treatment to obtain a Ca-based ferrite material; the granularity of the second slurry is controlled to be 0.05-0.6 mu m, and the grain size of the Ca-based ferrite material is controlled to be 2.0-3.0 mu m; the grinding agent is boric acid, and the addition amount of the boric acid in the mixed raw material is 0.1-0.2 wt%;
(3) respectively weighing the Sr ferrite material prepared in the step (1) and the Ca ferrite material prepared in the step (2) according to the proportion, and simultaneously adding SiO2、CaCO3Adding the mixture of calcium gluconate and calcium gluconate into a ball mill, and adding deionized water as a ball milling medium for grinding to obtain mixed slurry; the particle size of the mixed slurry is controlled to be 0.5-0.7 mu m;
(4) centrifugally dewatering the mixed slurry prepared in the step (3), and performing compression molding to obtain a molded body; the concentration of the mixed slurry after centrifugal dehydration is 50-70 wt%; controlling the magnetic field of the press forming to be 14000-15000 Oe;
(5) carrying out heat treatment on the formed body at the temperature of 100-600 ℃, and then sintering in an air atmosphere to obtain the permanent magnetic ferrite; in the sintering process, the heating rate is 100-120 ℃/h, the sintering temperature is 1200-1205 ℃, and the sintering time is controlled to be 70-80 min.
2. A method for preparing a permanent magnetic ferrite according to claim 1, comprising the steps of:
(1) preparing an Sr-series ferrite material: weighing Fe according to the proportion2O3，La2O3，Co2O3And SrCO3Carrying out wet primary ball milling to obtain first slurry, drying, pre-pressing and pre-burning the first slurry to obtain first pre-burning materials, and then carrying out dry coarse crushing treatment on the first pre-burning materials to obtain Sr ferrite materials;
(2) preparing a Ca-based ferrite material: weighing Fe according to the proportion2O3，CaCO3，La2O3，Co2O3，SrCO3And BaCO3Adding an abrasive, performing wet primary ball milling to obtain first slurry, drying, pre-pressing and pre-sintering the second slurry to obtain a second pre-sintered material; then the second pre-sintered material is subjected to dry type coarse crushing treatment to obtain a Ca-based ferrite material; the grinding agent is boric acid, and the addition amount of the boric acid in the mixed raw material is 0.1-0.2 wt%;
(3) respectively weighing the Sr ferrite material prepared in the step (1) and the Ca ferrite material prepared in the step (2) according to the proportion, and simultaneously adding SiO2、CaCO3Adding the mixture of calcium gluconate and calcium gluconate into a ball mill, and addingGrinding with ionized water as ball milling medium to obtain mixed slurry;
(4) centrifugally dewatering the mixed slurry prepared in the step (3), and performing compression molding to obtain a molded body; the concentration of the mixed slurry after centrifugal dehydration is 50-70 wt%; controlling the magnetic field of the press forming to be 14000-15000 Oe;
(5) carrying out heat treatment on the formed body at the temperature of 100-600 ℃, and then sintering in an air atmosphere to obtain the permanent magnetic ferrite; in the sintering process, the heating rate is 100-120 ℃/h, the sintering temperature is 1200-1205 ℃, and the sintering time is controlled to be 70-80 min.
3. The preparation method of the permanent magnetic ferrite according to claim 2, characterized in that in the step (1), the time of the wet primary ball milling is controlled to be 5-10 h; the granularity of the first slurry is controlled to be 0.05-0.6 mu m; controlling the pressure of the pre-pressing treatment to be 5-10 MPa; controlling the pre-sintering temperature to be 1200-1250 ℃; the particle size of the Sr ferrite material is controlled to be 2.0-3.0 μm.
4. The preparation method of the permanent magnetic ferrite according to claim 2, characterized in that in the step (2), the time of the wet primary ball milling is controlled to be 5-10 h; the granularity of the second slurry is controlled to be 0.05-0.6 mu m; controlling the pressure of the pre-pressing treatment to be 5-10 MPa; controlling the pre-sintering temperature to be 1250-1300 ℃; the particle size of the Ca-based ferrite material is controlled to be 2.0-3.0 μm.
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| JP2007176757A (en) * | 2005-12-28 | 2007-07-12 | Tdk Corp | Method of manufacturing ferrite magnetic material |
| CN104087246A (en) * | 2014-07-11 | 2014-10-08 | 司徒建辉 | Ceramic abrasive |
| CN105418062A (en) * | 2015-12-02 | 2016-03-23 | 横店集团东磁股份有限公司 | Permanent ferrite and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007176757A (en) * | 2005-12-28 | 2007-07-12 | Tdk Corp | Method of manufacturing ferrite magnetic material |
| CN104087246A (en) * | 2014-07-11 | 2014-10-08 | 司徒建辉 | Ceramic abrasive |
| CN105418062A (en) * | 2015-12-02 | 2016-03-23 | 横店集团东磁股份有限公司 | Permanent ferrite and preparation method thereof |
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