CN111302783A - Production method and use method of permanent magnetic ferrite for low-noise permanent magnet motor - Google Patents
Production method and use method of permanent magnetic ferrite for low-noise permanent magnet motor Download PDFInfo
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- 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
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- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
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- 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
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/442—Carbonates
Abstract
The invention discloses a production method of a permanent magnetic ferrite for a low-noise permanent magnetic motor, which comprises the following specific preparation steps: step a, stirring and mixing barium carbonate and iron oxide red according to a certain molar ratio, presintering after mixing to form a permanent magnetic ferrite presintering material, and then crushing the presintering material; b, preparing the following materials in percentage by weight: 70-84 parts of a pre-sintering material; 0.2-1.5 parts of silicon dioxide; 0.3-0.9 part of zirconium oxide; 0.8-2.1 parts of calcium carbonate; 2-5 parts of boric acid; 0.5-1.2 parts of strontium carbonate; c, adding the permanent magnetic ferrite pre-sintered material, the ingredients in percentage by weight in the step b and water into a ball mill for mixing, and carrying out ball milling for 3-4 h; d, precipitating the slurry, and forming the precipitated slurry; and e, sintering the formed mixture. The production method of the permanent magnetic ferrite for the low-noise permanent magnetic motor, provided by the invention, utilizes the pre-sintered material of the permanent magnetic ferrite and a reasonable formula for production, thereby greatly saving the production time and improving the yield of the permanent magnetic ferrite.
Description
Technical Field
The invention relates to a production method and a use method of a permanent magnetic ferrite for a low-noise permanent magnetic motor, and belongs to the technical field of permanent magnetic ferrites.
Background
Ferrite is a metal oxide having ferromagnetism. Depending on the magnetic properties and the application, ferrites can be classified as: the permanent magnetic ferrite can be divided into isotropic and anisotropic materials according to the difference of manufacturing processes. The two materials are the same in composition, the performance of the anisotropic permanent magnet is high, the anisotropic permanent magnet is prepared by molding and sintering a magnetic field, the easy magnetization axes of the particles are arranged along the direction of an external field, the anisotropic permanent magnet can be used for generating a constant magnetic field for an external space, and the permanent magnet ferrite has the following advantages and disadvantages: (1) the material has high resistivity (rho > -106 omega-m) and can be used in high-frequency occasions; (2) the raw materials are cheap, the sources are wide, the manufacturing process is simple and convenient, and the method is suitable for mass production; (3) the chemical stability is good, and the problem of oxidation does not exist; (4) the permanent magnetic ferrite has lower Curie temperature, so the temperature stability is poorer, and the permanent magnetic ferrite is not suitable for being used in occasions with strict requirements.
The existing permanent magnetic ferrite production method for the low-noise permanent magnetic motor is complex in production process and not mature in production process, so that the production cost is high, and technical innovation is performed on the basis of the existing technology.
Disclosure of Invention
The invention aims to provide a production method and a use method of a permanent magnetic ferrite for a low-noise permanent magnetic motor, and aims to solve the problems that the production process of the existing production method for the permanent magnetic ferrite for the low-noise permanent magnetic motor is complex, the production process is not mature enough, and the production cost is high in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a production method of a permanent magnetic ferrite for a low-noise permanent magnetic motor comprises the following specific preparation steps:
step a, stirring and mixing barium carbonate and iron oxide red according to a certain molar ratio, adding silicon dioxide again according to the ratio of 0.3-0.8%, presintering after mixing to form a permanent magnetic ferrite presintering material, and then crushing the presintering material;
b, preparing the following materials in percentage by weight: 70-84 parts of a pre-sintering material; 0.2-1.5 parts of silicon dioxide; 0.3-0.9 part of zirconium oxide; 0.8-2.1 parts of calcium carbonate; 2-5 parts of boric acid; 0.5-1.2 parts of strontium carbonate;
c, adding the permanent magnetic ferrite pre-sintered material, the ingredients in percentage by weight in the step b and water into a ball mill for mixing, and carrying out ball milling for 3-4 h;
d, filtering the slurry subjected to ball milling, putting the slurry into a natural precipitation tower for precipitation, and forming the precipitated slurry;
and e, pre-drying the formed mixture to enable the water content to be lower than 1%, and then sintering the formed mixture.
Preferably, the molar ratio of barium carbonate to iron oxide red in the step a is 1:5.0-7.1, and the pre-sintering temperature is 1000-1500 ℃.
Preferably, the ingredients in the step b are mixed according to the following weight percentage: 74-80 parts of a pre-sintering material; 0.6-1.2 parts of silicon dioxide; 0.5-0.7 part of zirconium oxide; 1.2-1.7 parts of calcium carbonate; 2.5-4.5 parts of boric acid; 0.7-1.0 part of strontium carbonate.
Preferably, the ingredients in the step b are mixed according to the following weight percentage: 76-78 parts of a pre-sintering material; 0.8-1.0 part of silicon dioxide; 0.55-0.65 part of zirconium oxide; 1.4-1.5 parts of calcium carbonate; 2.8-4.2 parts of boric acid; 0.8-0.9 part of strontium carbonate.
Preferably, in the step c, the mass ratio of the permanent magnetic ferrite pre-sintering material to the water is 78: 8: 14, and the ball-milled particles are controlled to be below 1.2 mu m.
Preferably, the precipitation time of the slurry after ball milling in the step d in a natural precipitation tower is 2-4 h.
Preferably, the sintering temperature in the step e is 1000-1200 ℃.
Compared with the prior art, the invention has the following beneficial effects:
according to the production method of the permanent magnetic ferrite for the low-noise permanent magnetic motor, provided by the invention, the permanent magnetic ferrite pre-sintering material and a reasonable formula are used for production, so that the production time is greatly saved, the yield of the permanent magnetic ferrite can be improved, the production quality is improved, and the process recorded in the application can be simultaneously used for carrying out large-scale production on the permanent magnetic ferrite, so that the production cost is further saved.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail with reference to the following examples, but the embodiments of the present invention are not limited thereto.
The production method of the permanent magnetic ferrite for the low-noise permanent magnetic motor provided by the embodiment comprises the following specific preparation steps:
step a, stirring and mixing barium carbonate and iron oxide red according to a certain molar ratio, adding silicon dioxide again according to the ratio of 0.3-0.8%, presintering after mixing to form a permanent magnetic ferrite presintering material, and then crushing the presintering material;
b, preparing the following materials in percentage by weight: 70-84 parts of a pre-sintering material; 0.2-1.5 parts of silicon dioxide; 0.3-0.9 part of zirconium oxide; 0.8-2.1 parts of calcium carbonate; 2-5 parts of boric acid; 0.5-1.2 parts of strontium carbonate;
c, adding the permanent magnetic ferrite pre-sintered material, the ingredients in percentage by weight in the step b and water into a ball mill for mixing, and carrying out ball milling for 3-4 h;
d, filtering the slurry subjected to ball milling, putting the slurry into a natural precipitation tower for precipitation, and forming the precipitated slurry;
and e, pre-drying the formed mixture to enable the water content to be lower than 1%, and then sintering the formed mixture.
The molar ratio of barium carbonate to iron oxide red in the step a is 1:5.0-7.1, and the pre-sintering temperature is 1000-1500 ℃.
In the step c, the mass ratio of the permanent magnetic ferrite pre-sintered material to the water is 78: 8: 14, and the ball-milled particles are controlled to be below 1.2 mu m.
And d, precipitating the slurry subjected to ball milling in the step d in a natural precipitation tower for 2-4 h.
In the step e, the sintering temperature is 1000-1200 ℃.
In this embodiment, the method for producing a permanent magnetic ferrite for a low-noise permanent magnetic motor specifically comprises the following steps:
step a, stirring and mixing barium carbonate and iron oxide red according to a certain molar ratio, adding silicon dioxide again according to the ratio of 0.3-0.8%, presintering after mixing to form a permanent magnetic ferrite presintering material, and then crushing the presintering material;
b, preparing the following materials in percentage by weight: 74-80 parts of a pre-sintering material; 0.6-1.2 parts of silicon dioxide; 0.5-0.7 part of zirconium oxide; 1.2-1.7 parts of calcium carbonate; 2.5-4.5 parts of boric acid; 0.7-1.0 part of strontium carbonate;
c, adding the permanent magnetic ferrite pre-sintered material, the ingredients in percentage by weight in the step b and water into a ball mill for mixing, and carrying out ball milling for 3-4 h;
d, filtering the slurry subjected to ball milling, putting the slurry into a natural precipitation tower for precipitation, and forming the precipitated slurry;
and e, pre-drying the formed mixture to enable the water content to be lower than 1%, and then sintering the formed mixture.
The molar ratio of barium carbonate to iron oxide red in the step a is 1:5.0-7.1, and the pre-sintering temperature is 1000-1500 ℃.
In the step c, the mass ratio of the permanent magnetic ferrite pre-sintered material to the water is 78: 8: 14, and the ball-milled particles are controlled to be below 1.2 mu m.
And d, precipitating the slurry subjected to ball milling in the step d in a natural precipitation tower for 2-4 h.
In the step e, the sintering temperature is 1000-1200 ℃.
In this embodiment, the method for producing a permanent magnetic ferrite for a low-noise permanent magnetic motor specifically comprises the following steps:
step a, stirring and mixing barium carbonate and iron oxide red according to a certain molar ratio, adding silicon dioxide again according to the ratio of 0.3-0.8%, presintering after mixing to form a permanent magnetic ferrite presintering material, and then crushing the presintering material;
b, preparing the following materials in percentage by weight: 76-78 parts of a pre-sintering material; 0.8-1.0 part of silicon dioxide; 0.55-0.65 part of zirconium oxide; 1.4-1.5 parts of calcium carbonate; 2.8-4.2 parts of boric acid; 0.8-0.9 part of strontium carbonate;
c, adding the permanent magnetic ferrite pre-sintered material, the ingredients in percentage by weight in the step b and water into a ball mill for mixing, and carrying out ball milling for 3-4 h;
d, filtering the slurry subjected to ball milling, putting the slurry into a natural precipitation tower for precipitation, and forming the precipitated slurry;
and e, pre-drying the formed mixture to enable the water content to be lower than 1%, and then sintering the formed mixture.
The molar ratio of barium carbonate to iron oxide red in the step a is 1:5.0-7.1, and the pre-sintering temperature is 1000-1500 ℃.
In the step c, the mass ratio of the permanent magnetic ferrite pre-sintered material to the water is 78: 8: 14, and the ball-milled particles are controlled to be below 1.2 mu m.
And d, precipitating the slurry subjected to ball milling in the step d in a natural precipitation tower for 2-4 h.
Preferably, the sintering temperature in the step e is 1000-1200 ℃.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.
Claims (7)
1. A production method of a permanent magnetic ferrite for a low-noise permanent magnetic motor is characterized by comprising the following specific preparation steps:
step a, stirring and mixing barium carbonate and iron oxide red according to a certain molar ratio, adding silicon dioxide again according to the ratio of 0.3-0.8%, presintering after mixing to form a permanent magnetic ferrite presintering material, and then crushing the presintering material;
b, preparing the following materials in percentage by weight: 70-84 parts of a pre-sintering material; 0.2-1.5 parts of silicon dioxide; 0.3-0.9 part of zirconium oxide; 0.8-2.1 parts of calcium carbonate; 2-5 parts of boric acid; 0.5-1.2 parts of strontium carbonate;
c, adding the permanent magnetic ferrite pre-sintered material, the ingredients in percentage by weight in the step b and water into a ball mill for mixing, and carrying out ball milling for 3-4 h;
d, filtering the slurry subjected to ball milling, putting the slurry into a natural precipitation tower for precipitation, and forming the precipitated slurry;
and e, pre-drying the formed mixture to enable the water content to be lower than 1%, and then sintering the formed mixture.
2. The method for producing permanent magnetic ferrite for a low noise permanent magnet motor according to claim 1, wherein: the molar ratio of barium carbonate to iron oxide red in the step a is 1:5.0-7.1, and the pre-sintering temperature is 1000-1500 ℃.
3. The method for producing permanent magnetic ferrite for a low noise permanent magnet motor according to claim 1, wherein: the ingredients in the step b are prepared according to the following weight percentages: 74-80 parts of a pre-sintering material; 0.6-1.2 parts of silicon dioxide; 0.5-0.7 part of zirconium oxide; 1.2-1.7 parts of calcium carbonate; 2.5-4.5 parts of boric acid; 0.7-1.0 part of strontium carbonate.
4. The method for producing permanent magnetic ferrite for a low noise permanent magnet motor according to claim 1, wherein: the ingredients in the step b are prepared according to the following weight percentages: 76-78 parts of a pre-sintering material; 0.8-1.0 part of silicon dioxide; 0.55-0.65 part of zirconium oxide; 1.4-1.5 parts of calcium carbonate; 2.8-4.2 parts of boric acid; 0.8-0.9 part of strontium carbonate.
5. The method for producing permanent magnetic ferrite for a low noise permanent magnet motor according to claim 1, wherein: in the step c, the mass ratio of the permanent magnetic ferrite pre-sintered material to the water is 78: 8: 14, and the ball-milled particles are controlled to be below 1.2 mu m.
6. The method for producing permanent magnetic ferrite for a low noise permanent magnet motor according to claim 1, wherein: and d, precipitating the slurry subjected to ball milling in the step d in a natural precipitation tower for 2-4 h.
7. The method for producing permanent magnetic ferrite for a low noise permanent magnet motor according to claim 1, wherein: and e, sintering at 1000-1200 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112723871A (en) * | 2020-12-30 | 2021-04-30 | 南京瑞洋新材料科技有限公司 | High-magnetism permanent magnetic ferrite magnetic shoe and preparation method thereof |
| CN112723871B (en) * | 2020-12-30 | 2023-09-29 | 南京瑞洋新材料科技有限公司 | High-magnetic permanent magnetic ferrite magnetic shoe and preparation method thereof |
| CN115716744A (en) * | 2021-08-24 | 2023-02-28 | 横店集团东磁股份有限公司 | Method for preparing permanent magnetic ferrite from low-purity high-silicon iron red and permanent magnetic ferrite |
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Application publication date: 20200619 |