阅读说明：本技术 一种稀土置换锶铁氧体及其制备方法 (Rare earth-substituted strontium ferrite and preparation method thereof ) 是由 许坚 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种稀土置换锶铁氧体及其制备方法,应用在磁瓦加工的领域中,解决了现有锶铁氧体磁材磁性性能不佳的技术问题,其技术方案要点是以质量百分数计,包括以下组分原料：碳酸锶17-21％、三氧化二铁15-25％、氧化镧20-25％、四氧化三钴28-39％、二氧化硅2-5％、碳酸钙1-3％、氧化锌0.5-1.2％、绝缘树脂0.1-0.7％、其他助剂0.2-0.6％,具有利于提升磁材中铁氧体磁性性能的技术效果。(The invention discloses a rare earth replacement strontium ferrite and a preparation method thereof, which are applied to the field of magnetic shoe processing and solve the technical problem of poor magnetic property of the existing strontium ferrite magnetic material, and the technical scheme is characterized by comprising the following raw materials in percentage by mass: 17-21% of strontium carbonate, 15-25% of ferric oxide, 20-25% of lanthanum oxide, 28-39% of cobaltosic oxide, 2-5% of silicon dioxide, 1-3% of calcium carbonate, 0.5-1.2% of zinc oxide, 0.1-0.7% of insulating resin and 0.2-0.6% of other auxiliary agents, and has the technical effect of being beneficial to improving the magnetic performance of the ferrite in the magnetic material.)

1. A rare earth replaced strontium ferrite and a preparation method thereof are characterized in that: the composite material comprises the following raw materials in percentage by mass:

17 to 21 percent of strontium carbonate

15 to 25 percent of ferric oxide

20 to 25 percent of lanthanum oxide

Cobaltosic oxide 28-39%

2 to 5 percent of silicon dioxide

1 to 3 percent of calcium carbonate

0.5 to 1.2 percent of zinc oxide

0.1 to 0.7 percent of insulating resin

0.2 to 0.6 percent of other auxiliary agents.

2. The rare earth-substituted strontium ferrite and the preparation method thereof according to claim 1, wherein the rare earth-substituted strontium ferrite comprises the following components: the auxiliary agent comprises absolute ethyl alcohol, bentonite, boron oxide and the like.

3. The rare earth-substituted strontium ferrite and the preparation method thereof according to claim 1, wherein the rare earth-substituted strontium ferrite comprises the following components: the insulating resin is acrylic resin.

4. A method for preparing rare earth substituted strontium ferrite according to claims 1-3, wherein the method comprises the following steps: comprises the following steps of (a) carrying out,

(1) ball milling and mixing, namely mixing strontium carbonate, ferric oxide, lanthanum oxide, cobaltosic oxide, silicon dioxide, calcium carbonate, zinc oxide and the like, and putting the mixture into a ball mill for ball milling to reach the grain diameter of 1.4-1.5 mu m of the mixture;

(2) pre-burning, namely adding water into the ball-milled granules to meet the condition that the mass ratio of the water to the granules is 1: 8-1: continuously stirring and mixing for 5-8min, performing compression molding, putting the molded blank into a combustion furnace for primary presintering at the temperature of 1040-;

(3) crushing, namely putting the combustion material obtained in the step 2 into a crusher for mechanical crushing, wherein the crushing speed is 600r/min and lasts for 5-10min, and the particle size of the obtained crushed particles meets 2.5-3 mu m;

(4) and (3) secondary grinding, namely grinding the particle mixture generated in the step (3) again, and simultaneously adding water and talcum powder to meet the requirement that the mass ratio of the water to the particle mixture is 1: 3.5-1: 4, continuously grinding until the granularity of the slurry reaches 0.5-0.65 mu m;

(5) wet pressing to form a blank, standing the slurry obtained in the step (4) until the water content is 30% -37%, performing pressure test under the pressure condition of 20-53 Mpa and an external magnetic field of 10-17kOe, and selecting proper pressure to perform a continuous wet pressing process to obtain a raw blank;

(6) decarburizing and sintering, namely decarburizing the green blank material generated in the step (5), and sintering again at the sintering temperature 990-1200 ℃ for 2.5 hours;

(7) polishing and grinding, namely grinding the sintered magnet produced in the step (6).

5. The rare earth-substituted strontium ferrite and the preparation method thereof according to claim 4, wherein the rare earth-substituted strontium ferrite comprises the following components: the green compact in the step (5) has a density of 2.8g/cm3-3.2g/cm 3.

6. The rare earth-substituted strontium ferrite and the preparation method thereof according to claim 5, wherein the rare earth-substituted strontium ferrite comprises the following components: the ball milling and grinding process comprises the following steps of: 3: 3. diameter of phi 2, phi 4, phi 8 mm.

Technical Field

The invention relates to the field of magnetic shoe processing, in particular to rare earth replacement strontium ferrite and a preparation method thereof.

Background

In the existing traditional magnetic shoe processing and producing process, strontium ferrite is mainly used as a main material for processing and forming magnetic materials. However, because the magnetic properties such as magnetic flux density of the conventional strontium ferrite are poor, the magnetic shoe component with the same quality needs to be achieved, and the volume and the mass of the magnetic material are often larger.

Therefore, technical personnel try to continuously optimize the magnetic material formula so as to reduce the use of strontium ferrite components in actual production and processing, achieve stable magnetic performance and optimize the magnetic material components, improve the production and processing process of the traditional magnetic shoe and improve the performance characteristics of the magnetic shoe ferrite.

Disclosure of Invention

The invention aims to provide a rare earth replacement strontium ferrite and a preparation method thereof, and the rare earth replacement strontium ferrite has the advantage of being beneficial to improving the magnetic property of the ferrite.

The technical purpose of the invention is realized by the following technical scheme: the rare earth replaced strontium ferrite and the preparation method thereof comprise the following raw materials in percentage by mass:

17 to 21 percent of strontium carbonate

15 to 25 percent of ferric oxide

20 to 25 percent of lanthanum oxide

Cobaltosic oxide 28-39%

2 to 5 percent of silicon dioxide

1 to 3 percent of calcium carbonate

0.5 to 1.2 percent of zinc oxide

0.1 to 0.7 percent of insulating resin

0.2 to 0.6 percent of other auxiliary agents.

Preferably, the auxiliary agent comprises absolute ethyl alcohol, bentonite, boron oxide and the like.

Preferably, the insulating resin is an acrylic resin.

Preferably, the preparation method of the rare earth-substituted strontium ferrite comprises the following steps,

(1) ball milling and mixing, namely mixing strontium carbonate, ferric oxide, lanthanum oxide, cobaltosic oxide, silicon dioxide, calcium carbonate, zinc oxide and the like, and putting the mixture into a ball mill for ball milling to reach the grain diameter of 1.4-1.5 mu m of the mixture;

(2) pre-burning, namely adding water into the ball-milled granules to meet the condition that the mass ratio of the water to the granules is 1: 8-1: continuously stirring and mixing for 5-8min, performing compression molding, putting the molded blank into a combustion furnace for primary presintering at the temperature of 1040-;

(3) crushing, namely putting the combustion material obtained in the step 2 into a crusher for mechanical crushing, wherein the crushing speed is 600r/min and lasts for 5-10min, and the particle size of the obtained crushed particles meets 2.5-3 mu m;

(4) and (3) secondary grinding, namely grinding the particle mixture generated in the step (3) again, and simultaneously adding water and talcum powder to meet the requirement that the mass ratio of the water to the particle mixture is 1: 3.5-1: 4, continuously grinding until the granularity of the slurry reaches 0.5-0.65 mu m;

(5) wet pressing to form a blank, standing the slurry obtained in the step (4) until the water content is 30% -37%, performing pressure test under the pressure condition of 20-53 Mpa and an external magnetic field of 10-17kOe, and selecting proper pressure to perform a continuous wet pressing process to obtain a raw blank;

(6) decarburizing and sintering, namely decarburizing the green blank material generated in the step (5), and sintering again at the sintering temperature 990-1200 ℃ for 2.5 hours;

(7) polishing and grinding, namely grinding the sintered magnet produced in the step (6).

Preferably, the green body has a density of from 2.8g/cm3 to 3.2g/cm 3.

Preferably, the ball milling and grinding process comprises the following steps of: 3: 3. diameter of phi 2, phi 4, phi 8 mm.

In conclusion, the invention has the following beneficial effects:

1. through the sufficient mixing in the material mixing process, strontium ions and the like in the traditional ferrite are replaced by a large amount of lanthanum and cobalt ions in the rare earth, so that the main components of the ferrite are replaced, and the characteristics of the ferrite such as magnetic property, magnet structure and the like are remarkably improved.

Detailed Description

The present invention will be described in further detail below.

Example 1: a process for preparing rare-earth strontium ferrite includes such steps as preparing rare-earth strontium ferrite,

(1) mixing 18% of strontium carbonate, 20% of ferric oxide, 24% of lanthanum oxide, 33% of cobaltosic oxide, 3% of silicon dioxide, 1.2% of calcium carbonate, 0.5% of zinc oxide, 0.1% of acrylic resin and 0.2% of absolute ethyl alcohol, bentonite and boron oxide by mass percent, putting the mixture into a ball mill for ball milling, wherein the ball milling process comprises the following steps of: 3: 3 steel ball media with the diameters of phi 2, phi 4 and phi 8mm respectively to reach the grain diameter of the mixture of 1.4 mu m;

(2) pre-burning, namely adding water into the ball-milled granules to meet the condition that the mass ratio of the water to the granules is 1: 8, continuously stirring and mixing for 6min, performing compression molding, putting the molded blank into a combustion furnace for primary presintering at the temperature of 1040-;

(3) crushing, namely putting the combustion material obtained in the step 2 into a crusher for mechanical crushing, wherein the crushing speed is 600r/min and lasts for 6min, and the particle size of the obtained crushed particles meets 2.6 mu m;

(4) and (3) secondary grinding, namely grinding the particle mixture generated in the step (3) again, and simultaneously adding water and talcum powder to meet the requirement that the mass ratio of the water to the particle mixture is 1: 3.5, continuously grinding until the granularity of the slurry reaches 0.52 mu m;

(5) wet pressing to form a blank, standing the slurry obtained in the step (4) until the water content is 35%, carrying out pressure test under the pressure condition of 28Mpa and an external magnetic field of 12kOe, and carrying out continuous wet pressing to form the blank to obtain a raw blank, wherein the density of the raw blank reaches 2.9g/cm 3;

(6) decarburizing and sintering, namely decarburizing the green blank material generated in the step (5), and sintering again at the sintering temperature 990-1200 ℃ for 2.5 hours;

(7) polishing and grinding, namely grinding the sintered magnet produced in the step (6).

Example 2: a process for preparing rare-earth strontium ferrite includes such steps as preparing rare-earth strontium ferrite,

(1) mixing 21% of strontium carbonate, 22% of ferric oxide, 22% of lanthanum oxide, 28% of cobaltosic oxide, 4% of silicon dioxide, 2% of calcium carbonate, 1% of zinc oxide, 0.6% of acrylic resin, 0.4% of absolute ethyl alcohol, bentonite and boron oxide by mass percent, and putting the mixture into a ball mill for ball milling, wherein the ball milling process comprises the following steps of: 3: 3 steel ball media with the diameters of phi 2, phi 4 and phi 8mm respectively to reach the grain diameter of the mixture of 1.5 mu m;

(2) pre-burning, namely adding water into the ball-milled granules to meet the condition that the mass ratio of the water to the granules is 1: 10, continuously stirring and mixing for 8min, performing compression molding, putting the molded blank into a combustion furnace for primary presintering at the temperature of 1040-;

(3) crushing, namely putting the combustion material obtained in the step 2 into a crusher for mechanical crushing, wherein the crushing speed is 600r/min and lasts for 9min, and the particle size of the obtained crushed particles meets 3 mu m;

(4) and (3) secondary grinding, namely grinding the particle mixture generated in the step (3) again, and simultaneously adding water and talcum powder to meet the requirement that the mass ratio of the water to the particle mixture is 1: 4, continuously grinding until the granularity of the slurry reaches 0.6 mu m;

(5) wet pressing to form a blank, standing the slurry obtained in the step (4) until the water content is 35%, carrying out pressure test under the pressure condition of 43Mpa and with an external magnetic field of 17kOe, and carrying out continuous wet pressing to form the blank to obtain a raw blank, wherein the density of the raw blank reaches 3.1g/cm 3;

(6) decarburizing and sintering, namely decarburizing the green blank material generated in the step (5), and sintering again at the sintering temperature 990-1200 ℃ for 2.5 hours;

(7) polishing and grinding, namely grinding the sintered magnet produced in the step (6).

Example 3: a process for preparing rare-earth strontium ferrite includes such steps as preparing rare-earth strontium ferrite,

(1) mixing 21% of strontium carbonate, 20% of ferric oxide, 20% of lanthanum oxide, 34% of cobaltosic oxide, 4% of silicon dioxide, 1% of calcium carbonate, 0.6% of zinc oxide, 0.2% of acrylic resin, 0.2% of absolute ethyl alcohol, bentonite and boron oxide in percentage by mass, putting the mixture into a ball mill for ball milling, wherein the ball milling process comprises the following steps of: 3: 3, the steel ball media with the diameters of phi 2, phi 4 and phi 8mm respectively reach the grain diameter of the mixture of 1.4 to 1.5 mu m;

(2) pre-burning, namely adding water into the ball-milled granules to meet the condition that the mass ratio of the water to the granules is 1: 10.5, continuously stirring and mixing for 7.5min, performing compression molding, putting the molded blank into a combustion furnace for primary presintering at the temperature of 1040-;

(3) crushing, namely putting the combustion material obtained in the step 2 into a crusher for mechanical crushing, wherein the crushing speed is 600r/min and lasts for 8min, and the particle size of the obtained crushed particles meets 2.9 mu m;

(4) and (3) secondary grinding, namely grinding the particle mixture generated in the step (3) again, and simultaneously adding water and talcum powder to meet the requirement that the mass ratio of the water to the particle mixture is 1: 3.8, continuously grinding until the granularity of the slurry reaches 0.5 mu m;

(5) wet pressing to form a blank, standing the slurry obtained in the step (4) until the water content is 36%, performing pressure test under the pressure condition of 50Mpa and an external magnetic field of 15kOe, and selecting proper pressure to perform continuous wet pressing to form the blank, wherein the density of the blank is 3g/cm 3;

(6) decarburizing and sintering, namely decarburizing the green blank material generated in the step (5), and sintering again at the sintering temperature 990-1200 ℃ for 2.5 hours;

(7) polishing and grinding, namely grinding the sintered magnet produced in the step (6).

Through the actual processing of the above-mentioned embodiments, the following parameters were obtained: (in mass percent)

The ferrite product processed and produced by the preparation method and the preparation formula has excellent performance on magnetic property, can meet the use requirement of actual processing and production, and obviously improves the property of strontium ferrite produced by the traditional process formula.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.