CN113956029A - Method for reducing shrinkage rate of permanent magnetic ferrite material - Google Patents
Method for reducing shrinkage rate of permanent magnetic ferrite material Download PDFInfo
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- CN113956029A CN113956029A CN202111412691.2A CN202111412691A CN113956029A CN 113956029 A CN113956029 A CN 113956029A CN 202111412691 A CN202111412691 A CN 202111412691A CN 113956029 A CN113956029 A CN 113956029A
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- permanent magnetic
- shrinkage
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- magnetic ferrite
- ferrite material
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- 239000000463 material Substances 0.000 title claims abstract description 38
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 3
- 230000000996 additive effect Effects 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 26
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical group [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 22
- 238000005245 sintering Methods 0.000 claims description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 12
- 235000019270 ammonium chloride Nutrition 0.000 claims description 11
- 229910052712 strontium Inorganic materials 0.000 claims description 10
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 150000003841 chloride salts Chemical class 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 125000001309 chloro group Chemical class Cl* 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 description 4
- 239000005995 Aluminium silicate Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000001467 acupuncture Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000007858 starting material Substances 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
- C04B35/2683—Other ferrites containing 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- 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
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
- H01F1/0315—Ferrites
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- 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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- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/442—Carbonates
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/95—Products characterised by their size, e.g. microceramics
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
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- Materials Engineering (AREA)
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- Inorganic Chemistry (AREA)
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Abstract
A method for reducing the shrinkage rate of permanent magnetic ferrite material uses chloride as low shrinkage additive. The invention can solve the problem of abnormal product size caused by fluctuation of shrinkage rate of raw materials by adopting a conventional production process without greatly adjusting the formula, simultaneously the magnetic property of the product is not influenced, the same pair of dies can be used for manufacturing products with different size tolerance specifications, and the production cost is obviously reduced.
Description
Technical Field
The invention relates to a method for reducing the shrinkage of a ferrite material, in particular to a method for reducing the shrinkage of a permanent magnetic ferrite material.
Background
The permanent magnetic ferrite is a basic functional material with wide application, has wide raw material sources and low price, and is mainly used for various permanent magnetic motors, microwave ovens, loudspeakers and other equipment at present, wherein the permanent magnetic ferrite has various shapes, such as sheet, tile, ring, special shape and the like. The permanent magnetic ferrite magnetic ring for the traditional loudspeaker industry is mainly obtained by pressing, sintering and grinding double end faces by using a die for fixing acupuncture points, and the inner diameter and the outer diameter of a product are strictly determined by the shrinkage rate of a material on the basis of the size of an opened pressing die because the grinding process is different from the process of processing all end faces by using a magnetic shoe for a motor, and the inner diameter and the outer diameter of the product are not in accordance with the requirements of customers if the raw material shrinkage and the die opening shrinkage of the die have certain deviation.
In order to solve the size abnormality caused by large fluctuation of raw material shrinkage, the conventional proposal usually achieves the purpose of reducing material shrinkage by adding sulfate or kaolin into a secondary formula. However, in the actual batch production process, the addition of sulfate causes the surface to be blackened although the shrinkage is reduced; when the addition amount of the kaolin is within 0.5 percent, almost no influence is caused on the shrinkage rate, and when the addition amount is too large, Br of the material is reduced, and the effect is limited when the shrinkage difference of the material is large; therefore, the mold adapting to the shrinkage of the raw material is required to be newly opened to meet the production requirement, so that the manufacturing cost of an enterprise is increased substantially when the raw material is frequently switched.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and providing a method for reducing the shrinkage rate of a permanent magnetic ferrite material without influencing the magnetic performance of the material.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for reducing the shrinkage rate of permanent magnetic ferrite material uses chloride as low shrinkage additive.
Preferably, the chloride salt and other raw materials are ground together in the grinding link, and then formed and sintered.
Preferably, the chloride salt is ammonium chloride.
Preferably, the other raw materials include strontium ferrite pre-sinter, calcium carbonate and silica.
Preferably, the weight of the ammonium chloride is 0.7-0.9% of the weight of the strontium ferrite pre-sintering material. When the addition amount of ammonium chloride is too low, the expected effect cannot be achieved, and when the addition amount is too high, the magnetic property of the product is changed and the color of the product is yellow.
More preferably, the weight of the calcium carbonate is 0.6-0.8% of the weight of the strontium ferrite pre-sinter.
More preferably, the weight of the silica is 0.3% -0.5% of the weight of the strontium ferrite pre-sinter.
Preferably, the weight ratio of the material, the water and the steel balls during grinding is 1: 1-2: 10-15; the grinding time is 5-10 h, the grinding temperature is less than 90 ℃, and the grinding is carried out until the granularity of the slurry reaches 1.02-1.08 mu m.
Preferably, the pressing pressure for forming is 400-450kg per square centimeter.
Preferably, the temperature is kept at 1000-1400 ℃ for 1-5 h in the sintering process.
The invention has the beneficial effects that: the invention can solve the problem of abnormal product size caused by fluctuation of shrinkage rate of raw materials by adopting a conventional production process without greatly adjusting the formula, simultaneously the magnetic property of the product is not influenced, the same pair of dies can be used for manufacturing products with different size tolerance specifications, and the production cost is obviously reduced.
Detailed Description
The present invention is further illustrated by the following examples.
The starting materials used in the examples of the present invention were all obtained from conventional commercial sources.
Example 1
The outer diameter of a permanent magnetic ferrite magnetic ring product is 75 +/-1.5 mm, the inner diameter of the permanent magnetic ferrite magnetic ring product is 32 +/-0.64 mm, the mold opening shrinkage rate of the existing mold is 1.14 (75 x 1.14=85.5 mm), the inner diameter of the existing mold is 1.152 (32 x 1.152=36.86 mm), the shrinkage rate of a slurry material for conventional production is 1.145, and the outer diameter of the product after pressing and sintering is 74.67mm and the inner diameter of the product after pressing and sintering is 32.19mm, which both meet the requirements of the drawing.
At present, because the shrinkage rate of the actually purchased raw materials is 1.17, the external diameter of a product pressed and sintered by using the same auxiliary die is 73.07mm and the internal diameter is 31.50mm through test verification, and the external diameter does not meet the requirements of the drawing. The preparation method is characterized in that 0.8% of ammonium chloride is added in the grinding link, and the ammonium chloride and other raw materials are ground, molded and sintered together, so that the magnetic performance of the obtained permanent magnetic ferrite product is not obviously changed, the shrinkage rate is reduced by 2% (1.147), and the outer diameter and the inner diameter of the pressed and sintered product are 74.54mm and 32.13mm, which both meet the requirements of drawings.
The specific preparation method of the permanent magnetic ferrite ring in this embodiment is as follows:
(1) preparing materials: weighing 1000g of strontium ferrite presintering material, 8g of calcium carbonate, 4g of silicon dioxide and 8g of ammonium chloride;
(2) grinding: wet material: the weight ratio of water to the steel ball is 1: 1.5: 12, grinding for 7 hours by using a rolling ball mill, controlling the temperature during grinding to be less than 90 ℃, and enabling the particle size of slurry to reach 1.05 mu m;
(3) molding: pressing and molding by using a mold, wherein the pressing pressure per unit area (square centimeter) reaches 400 kg;
(4) and (3) sintering: automatically feeding the blank into a 45-meter roller kiln, preserving heat for 2.5 hours at the temperature of 1210 +/-10 ℃, and automatically cooling along with the kiln;
(5) grinding: and grinding by using a double-end-face grinding machine to meet the drawing requirements.
Example 2
The outer diameter of a permanent magnetic ferrite magnetic ring product is 52 +/-1 mm, the inner diameter of the permanent magnetic ferrite magnetic ring product is 24mm, the mold opening shrinkage rate of the conventional mold is 1.14 (52 x 1.14=59.28 mm) and the inner diameter of the conventional mold is 1.152 (24.12 x 1.152=27.78 mm), the shrinkage rate of a slurry material for conventional production is 1.145, and the outer diameter of the product after pressing and sintering is 51.77mm and the inner diameter of the product after pressing and sintering is 24.26mm, which both meet the requirements of the drawing.
At present, because the shrinkage rate of the actually purchased raw materials is 1.158, the external diameter and the internal diameter of a product pressed and sintered by using the same auxiliary die are both 50.66mm and 23.74mm through experimental verification, and the internal diameter and the external diameter do not meet the requirements of the drawing. The preparation method is characterized in that 0.8% of ammonium chloride is added in the grinding link, and the ammonium chloride and other raw materials are ground, molded and sintered together, so that the magnetic performance of the obtained permanent magnetic ferrite product is not obviously changed, the shrinkage rate is reduced by 1% (1.147), and the outer diameter and the inner diameter of the pressed and sintered product are 51.68mm and 24.26mm respectively, and meet the requirements of drawings.
The specific preparation method of the permanent magnetic ferrite ring in this embodiment is as follows:
(1) preparing materials: weighing 1000g of strontium ferrite pre-sintered material, 7g of calcium carbonate, 5g of silicon dioxide and 8g of ammonium chloride;
(2) grinding: wet material: the weight ratio of water to the steel ball is 1: 1.5: 12, grinding for 7 hours by using a rolling ball mill, controlling the temperature during grinding to be less than 90 ℃, and enabling the particle size of slurry to reach 1.05 mu m;
(3) molding: pressing and molding by using a mold, wherein the pressing pressure per unit area (square centimeter) reaches 400 kg;
(4) and (3) sintering: automatically feeding the blank into a 45-meter roller kiln, preserving heat for 2.5 hours at the temperature of 1210 +/-10 ℃, and automatically cooling along with the kiln;
(5) grinding: and grinding by using a double-end-face grinding machine to meet the drawing requirements.
Claims (10)
1. A method for reducing the shrinkage rate of a permanent magnetic ferrite material is characterized in that chlorine salt is used as a low shrinkage rate additive.
2. The method for reducing the shrinkage rate of the permanent magnetic ferrite material according to claim 1, wherein the chloride salt and other raw materials are ground together in the grinding step, and then the mixture is molded and sintered.
3. The method for reducing shrinkage of a permanent magnetic ferrite material according to claim 1 or 2, wherein the chloride salt is ammonium chloride.
4. The method for reducing the shrinkage of the permanent magnetic ferrite material according to any one of claims 1 to 3, wherein other raw materials comprise strontium ferrite pre-sintered material, calcium carbonate and silicon dioxide.
5. The method for reducing the shrinkage of the permanent magnetic ferrite material according to claim 3 or 4, wherein the weight of the ammonium chloride is 0.7-0.9% of the weight of the strontium ferrite pre-sintering material.
6. The method for reducing the shrinkage of a permanent magnetic ferrite material according to claim 4 or 5, wherein the weight of the calcium carbonate is 0.6-0.8% of the weight of the strontium ferrite pre-sintering material.
7. The method for reducing the shrinkage of the permanent magnetic ferrite material according to claim 4 or 5, wherein the weight of the silicon dioxide is 0.3% -0.5% of the weight of the strontium ferrite pre-sintering material.
8. The method for reducing the shrinkage of the permanent magnetic ferrite material according to any one of claims 2 to 7, wherein the weight ratio of the material, water and steel ball during grinding is 1: 1-2: 10-15; the grinding time is 5-10 h, the grinding temperature is less than 90 ℃, and the grinding is carried out until the granularity of the slurry reaches 1.02-1.08 mu m.
9. The method for reducing shrinkage of permanent magnetic ferrite material according to any one of claims 2 to 8, wherein the pressing pressure for molding is 400-450kg per square centimeter.
10. The method for reducing the shrinkage of the permanent magnetic ferrite material according to any one of claims 2 to 9, wherein the temperature is kept at 1000 to 1400 ℃ for 1 to 5 hours during the sintering process.
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|---|---|---|---|---|
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-
2021
- 2021-11-25 CN CN202111412691.2A patent/CN113956029A/en active Pending
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| 陈大明, 哈尔滨工程大学出版社 * |
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Application publication date: 20220121 |