CN111029124A - Powder efficient coating method and finished product powder and finished product magnetic powder core preparation method - Google Patents
Powder efficient coating method and finished product powder and finished product magnetic powder core preparation method Download PDFInfo
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- CN111029124A CN111029124A CN202010047713.9A CN202010047713A CN111029124A CN 111029124 A CN111029124 A CN 111029124A CN 202010047713 A CN202010047713 A CN 202010047713A CN 111029124 A CN111029124 A CN 111029124A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
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- 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
- H01F1/12—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 soft-magnetic materials
- H01F1/14—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 soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15341—Preparation processes therefor
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- 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
- H01F1/12—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 soft-magnetic materials
- H01F1/14—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 soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15341—Preparation processes therefor
- H01F1/1535—Preparation processes therefor by powder metallurgy, e.g. spark erosion
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- 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
- H01F1/12—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 soft-magnetic materials
- H01F1/14—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 soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15383—Applying coatings thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
Abstract
The invention provides a high-efficiency powder coating method, which comprises the following steps: s1, preparing amorphous nanocrystalline powder; and S2, adding cohesive inorganic matters to form an insulating coating on the surface of the amorphous nanocrystalline powder to obtain coated powder. The invention also provides a finished product powder preparation method and a finished product magnetic powder core preparation method applying the powder high-efficiency coating method; the method disclosed by the invention is applied, the amorphous nanocrystalline powder is coated by using the cohesive inorganic substance, and the inorganic substance is used as the adhesive and the insulating coating agent, so that the production efficiency is effectively improved, the introduction of non-magnetic substances is reduced, and the magnetic conductivity of the product is improved.
Description
Technical Field
The invention relates to the technical field of magnetically soft alloy metallurgy, in particular to a powder efficient coating method and a finished product powder and a finished product magnetic powder core preparation method.
Background
The amorphous nanocrystalline material has high saturation magnetic induction, high magnetic conductivity, low coercive force, low high-frequency loss, good strong hardness, wear resistance, corrosion resistance, good temperature and environmental stability and the like, has excellent comprehensive performance, replaces permalloy, silicon steel and ferrite, is applied to the power electronic technology, shows the characteristics of small volume, high efficiency, energy conservation and the like, and has the optimal cost performance ratio in all metal soft magnetic materials.
The insulating coating is a key technology in the preparation process of the amorphous nanocrystalline magnetic powder core, the performance of the insulating coating layer is an important factor influencing the high-frequency loss of the magnetic powder core, and if the insulating coating layer is not completely coated or damaged, the eddy current loss among magnetic powder particles is increased rapidly, so that the high-frequency loss of the magnetic powder core is increased.
In the prior art, an insulating coating agent and a binder are usually applied to carry out insulating coating treatment, the production process links are more, the production control difficulty is higher, and the development of a simple, convenient and efficient amorphous nanocrystalline powder coating method and a magnetic powder core preparation method are important ways for reducing the industrial production cost of the magnetic powder core.
Disclosure of Invention
The invention aims to provide a powder high-efficiency coating method, finished powder and a finished powder core preparation method for overcoming the defects of the prior art.
The high-efficiency powder coating method comprises the following steps:
s1, preparing amorphous nanocrystalline powder;
and S2, adding the amorphous nanocrystalline powder by using a cohesive inorganic substance, and uniformly mixing to form an insulating coating layer on the surface of the amorphous nanocrystalline powder to obtain coated powder.
Further, the cohesive inorganic substance is formed by diluting and mixing sodium silicate solution or inorganic silicone resin with a diluent.
Furthermore, the using proportion of the cohesive inorganic substance is 0.5-3.2%, and the proportion of the diluent is 1.2-6.5%.
Further, the cohesive inorganic substance has a modulus of 2.2 to 3.5 and a baume degree of 0.32 to 0.48.
Further, the diluent application comprises purified water or acetone or ethanol.
Further, the alloy component of the amorphous nanocrystalline powder is FeSiB or FeSiBCuNb, the amorphous nanocrystalline powder is obtained by mechanically crushing an amorphous nanocrystalline strip or by atomizing molten alloy, and the amorphous nanocrystalline powder is in a sheet shape or a sphere-like shape.
Further, the amorphous nanocrystalline powder is graded, and in step S1, the mesh ratio of the amorphous nanocrystalline powder is: 10-30% of-100 meshes to +150 meshes, 20-50% of-150 meshes to +200 meshes, 10-30% of-200 meshes to +270 meshes, and 5-20% of-270 meshes to +400 meshes.
Further, in step S2, the humidity of the cohesive inorganic substance and the amorphous nanocrystalline powder is 0.32-0.58% after the cohesive inorganic substance and the amorphous nanocrystalline powder are uniformly mixed.
A finished product powder preparation method applies the powder high-efficiency coating method; and comprises the following steps:
and S3, adding a lubricant into the obtained coated powder, and stirring and mixing to obtain the finished product powder.
A finished magnetic powder core preparation method is applied to the finished powder preparation method and comprises the following steps:
s1, pressing the obtained finished product powder to obtain a magnetic powder core blank;
s2, sintering, annealing and curing the magnetic powder core blank to obtain a semi-finished magnetic powder core;
and S3, performing spraying treatment on the semi-finished magnetic powder core to obtain the finished magnetic powder core.
The invention has the beneficial effects that:
according to the efficient powder coating method disclosed by the invention, the amorphous nanocrystalline powder is coated by using the cohesive inorganic substance, and the inorganic substance is used as the adhesive and the insulating coating agent, so that the production efficiency is effectively improved, the introduction of non-magnetic substances is reduced, the magnetic conductivity of the product is improved, and the magnetic performance of the product is optimized.
Detailed Description
In order to make the technical solution, objects and advantages of the present invention more apparent, the present invention will be further explained with reference to the following embodiments.
The invention relates to a preparation method of a finished magnetic powder core, which comprises the following process steps:
(1) the amorphous nanocrystalline alloy raw material is smelted by a smelting furnace to obtain the master alloy.
(2) And (3) carrying out strip spraying treatment on the master alloy through a strip spraying machine to obtain the amorphous nanocrystalline strip.
(3) And crushing the amorphous nanocrystalline strip by a pulverizer to obtain amorphous nanocrystalline raw powder.
(4) The amorphous nanocrystalline raw powder is graded by a sieving machine to obtain amorphous nanocrystalline powder with different meshes, and the amorphous nanocrystalline powder is uniformly mixed.
(5) And carrying out insulation coating treatment on the mixed amorphous nanocrystalline powder with different meshes to obtain the coated powder with amorphous nanocrystalline.
(6) Adding lubricant into the coating powder, and mixing and stirring by a conical stirrer to obtain finished product powder with amorphous nanocrystalline.
(7) And pressing the finished powder by a forging press to obtain the magnetic powder core blank with the amorphous nanocrystalline.
(8) And sintering the magnetic powder core blank in a sintering furnace to obtain the sintered magnetic powder core with amorphous nanocrystalline.
(9) Annealing the sintered magnetic powder core by an annealing furnace, and carrying out different annealing treatment steps according to the sintered magnetic powder cores with different alloy components to obtain the annealed magnetic powder core with amorphous nanocrystalline.
(10) And curing the annealed magnetic powder core by a vacuum impregnation machine to obtain a semi-finished magnetic powder core with amorphous nanocrystalline.
(11) And spraying the semi-finished magnetic powder core by an electrostatic spraying machine or a roller coating machine to obtain the finished magnetic powder core with amorphous nanocrystalline.
In the step (1), the alloy material is preferably a FeSiB amorphous nanocrystalline alloy, preferably Fe as a component, based on the application of a typical Fe-based amorphous alloy78Si9B13(ii) a Or based on the application of typical iron-based nanocrystalline alloy, the alloy raw material is preferably FeSiBCuNb amorphous nanocrystalline alloy; the alloy raw material is smelted at high temperature to obtain the master alloy; wherein the high-temperature smelting temperature is as follows: the smelting time is 1.5-4.5 h at 1250-1550 ℃.
In the step (2), the prepared master alloy is processed by a rapid cooling method to prepare the amorphous nanocrystalline strip.
In the step (3), the amorphous nanocrystalline strip is mechanically crushed to obtain the amorphous nanocrystalline raw powder; besides the mechanical crushing treatment by the amorphous nanocrystalline strip, the preparation of the amorphous nanocrystalline raw powder can be correspondingly carried out by applying the molten alloy atomization treatment in the prior art, so that the amorphous nanocrystalline raw powder is flaky or spheroidal.
In the step (4), the prepared amorphous nanocrystalline raw powder is classified and sieved to obtain the required amorphous nanocrystalline powder with different meshes. Meanwhile, powder matching is carried out according to the designed mesh ratio and the powder is uniformly mixed, so that the mesh ratio of the obtained mixed powder is as follows: 10-30% of-100 meshes to +150 meshes, 20-50% of-150 meshes to +200 meshes, 10-30% of-200 meshes to +270 meshes, and 5-20% of-270 meshes to +400 meshes.
The mixed powder with good fluidity is obtained by adjusting the proportion and mixing configuration of the mixed powder with different mesh settings, and the main parameters of good powder fluidity are as follows: loose density, tap density, angle of repose, degree of dispersion, etc., the comprehensive index is a fluidity index which can be tested by a Dandongboet powder characteristic analyzer; the fluidity index is above 70 and is a good grade, and the larger the fluidity index is, the better the fluidity is; the powder with good fluidity has smaller inter-powder resistance in the forming process, is beneficial to forming, and has larger magnetic powder core density and better product performance under the same pressure condition.
In the step (5), the obtained mixed powder is added into a double-shaft stirrer, and a cohesive inorganic substance is added for stirring until the mixture is uniform, so that an insulating coating layer is formed on the surface of the mixed powder, and coated powder is obtained; the adopted cohesive inorganic matter is a sodium silicate solution or inorganic silicon resin, preferably the sodium silicate solution, the modulus of the sodium silicate solution is preferably 2.5-3.5, the Baume degree is preferably 0.35-0.48, the ratio of the sodium silicate solution is 0.5-3.2%, the sodium silicate solution is diluted by a diluent, the ratio of the diluent is 1.2-6.5%, and the diluent can be selected from but not limited to acetone and ethanol.
In the step (6), the coating powder after insulation coating is added with a lubricant and mixed uniformly, wherein the lubricant includes but is not limited to zinc stearate, paraffin, and barium stearate.
In the step (7), the prepared finished powder is pressed and molded, and the molding pressure is 16-22t/cm 2.
In the step (8), the molded magnetic powder core is sintered in a sintering furnace, and the lubricant is discharged, wherein the sintering temperature is 240-.
In the step (9), the obtained sintered magnetic powder core is annealed, and when the alloy raw material of the sintered magnetic powder core is based on the application of a typical iron-based amorphous alloy, the annealing temperature is 350-480 ℃, the total annealing time is 1.5-3.5 h, and the heat preservation time is 20-60 min; when the alloy raw material of the sintered magnetic powder core is based on the application of a typical iron-based nanocrystalline alloy, the annealing temperature is 490-580 ℃, the total annealing time is 2-8 h, and the heat preservation time is 60-180 min.
In the step (11), the product is subjected to chamfer spraying treatment to obtain the final finished magnetic powder core.
The above description is only a preferred embodiment of the present invention, and those skilled in the art may still modify the described embodiment without departing from the implementation principle of the present invention, and the corresponding modifications should also be regarded as the protection scope of the present invention.
Claims (10)
1. The method for coating the powder with high efficiency is characterized by comprising the following steps:
s1, preparing amorphous nanocrystalline powder;
and S2, adding the amorphous nanocrystalline powder by using a cohesive inorganic substance, and uniformly mixing to form an insulating coating layer on the surface of the amorphous nanocrystalline powder to obtain coated powder.
2. The method for coating powder of claim 1, wherein the binding inorganic substance is formed by diluting and mixing sodium silicate solution or inorganic silicone resin with diluent.
3. The method for efficiently coating powder according to claim 2, wherein the binder inorganic substance is used in an amount of 0.5 to 3.2% and the diluent is used in an amount of 1.2 to 6.5%.
4. The method of claim 2, wherein the cohesive inorganic substance has a modulus of 2.2 to 3.5 and a baume degree of 0.32 to 0.48.
5. The method for coating powder with high efficiency as claimed in claim 3, wherein the diluent application comprises purified water or acetone or ethanol.
6. The method for high-efficiency cladding of powder according to claim 1, wherein the amorphous nanocrystalline powder has an alloy component of FeSiB or FeSiBCuNb, and the amorphous nanocrystalline powder is in a flake shape or a sphere-like shape.
7. The method for efficiently coating powder according to claim 1, wherein in step S1, the mesh ratio of the amorphous nanocrystalline powder is: 10-30% of-100 meshes to +150 meshes, 20-50% of-150 meshes to +200 meshes, 10-30% of-200 meshes to +270 meshes, and 5-20% of-270 meshes to +400 meshes.
8. The method for efficiently coating powder according to claim 1, wherein in step S2, the humidity of the mixture of the cohesive inorganic substance and the amorphous nano-crystalline powder is 0.32-0.58%.
9. A finished powder preparation method, which applies the high-efficiency powder coating method of any one of claims 1 to 8; the method is characterized by further comprising the following steps:
and S3, adding a lubricant into the obtained coated powder, and stirring and mixing to obtain the finished product powder.
10. A method for preparing a magnetic powder core finished product, which applies the method for preparing the powder finished product as claimed in claim 9; the method is characterized by further comprising the following steps:
s1, pressing the obtained finished product powder to obtain a magnetic powder core blank;
s2, sintering, annealing and curing the magnetic powder core blank to obtain a semi-finished magnetic powder core;
and S3, performing spraying treatment on the semi-finished magnetic powder core to obtain the finished magnetic powder core.
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| CN2019108826099 | 2019-09-18 | ||
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112185640A (en) * | 2020-09-23 | 2021-01-05 | 江西艾特磁材有限公司 | Method for coating magnetic powder core with sodium silicate |
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2020
- 2020-01-16 CN CN202010047713.9A patent/CN111029124A/en active Pending
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| CN1032197A (en) * | 1988-09-28 | 1989-04-05 | 张开正 | The production method of particulate Si ferrorphosphorus |
| JP2009130286A (en) * | 2007-11-27 | 2009-06-11 | Mitsubishi Materials Corp | Method of manufacturing high-strength, high-specific-resistance composite soft magnetic material, and electromagnetic circuit component |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112185640A (en) * | 2020-09-23 | 2021-01-05 | 江西艾特磁材有限公司 | Method for coating magnetic powder core with sodium silicate |
| WO2022062394A1 (en) * | 2020-09-23 | 2022-03-31 | 江西艾特新材料有限公司 | Method for coating magnetic powder core with sodium silicate |
| CN112185640B (en) * | 2020-09-23 | 2023-01-24 | 江西艾特磁材有限公司 | Method for coating magnetic powder core with sodium silicate |
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Application publication date: 20200417 |