CN113066631B - Application method of Parylene powder in iron-based soft magnetic composite material - Google Patents
Application method of Parylene powder in iron-based soft magnetic composite material Download PDFInfo
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- CN113066631B CN113066631B CN202110324265.7A CN202110324265A CN113066631B CN 113066631 B CN113066631 B CN 113066631B CN 202110324265 A CN202110324265 A CN 202110324265A CN 113066631 B CN113066631 B CN 113066631B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 239000000843 powder Substances 0.000 title claims abstract description 73
- 229920000052 poly(p-xylylene) Polymers 0.000 title claims abstract description 63
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 33
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002131 composite material Substances 0.000 title claims abstract description 18
- 239000006247 magnetic powder Substances 0.000 claims abstract description 20
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 238000000859 sublimation Methods 0.000 claims abstract description 11
- 230000008022 sublimation Effects 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000000748 compression moulding Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims description 26
- 238000000576 coating method Methods 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 238000000151 deposition Methods 0.000 claims description 18
- 230000008021 deposition Effects 0.000 claims description 16
- 239000011247 coating layer Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 229910002796 Si–Al Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 10
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 8
- 238000009413 insulation Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- URLKBWYHVLBVBO-UHFFFAOYSA-N Para-Xylene Chemical class CC1=CC=C(C)C=C1 URLKBWYHVLBVBO-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052809 inorganic oxide Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- H01F1/20—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 in the form of particles, e.g. powder
- H01F1/22—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 in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—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 in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
- H01F1/26—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 in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention provides an application method of Parylene powder in an iron-based soft magnetic composite material, which utilizes the characteristic that Parylene is easy to sublimate, coats the Parylene powder on the surface of an insulated coated iron-based magnetic powder through heating sublimation, is used as a lubricant for the insulated coated iron-based magnetic powder during compression molding, and can completely remove the Parylene under high temperature during annealing. Even if a large amount of Parylene is added, the obtained iron-based soft magnetic composite material has lower carbon content after annealing, and maintains better magnetic performance.
Description
Technical Field
The invention belongs to the technical field of soft magnetic materials, and relates to an application method of Parylene powder in an iron-based soft magnetic composite material.
Background
The Parylene coating formed by sublimation, pyrolysis and deposition polymerization of Parylene powder (substituted or unsubstituted paraxylene dimer) has high compactness, good stability, low friction coefficient, low water vapor permeability and the like, and is widely applied to the protection of materials, especially metal surfaces. CN108183012a discloses an insulating coating treatment method for improving the pressing density of an iron-based soft magnetic composite material, and a silicon dioxide insulating layer and a Parylene coating are sequentially coated outside the metal magnetic powder.
In order to improve the lubricity of the powder during the compression molding in the production of the soft magnetic composite SMC, it is generally necessary to add a small amount of a lubricant such as an organic substance or an organic salt such as zinc stearate or stearic acid to the powder before the compression. However, the removal of the added lubricant is difficult, incomplete or charring occurs at high temperature to cause residue, which in turn leads to a decrease in the magnetic properties of the SMC.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an application method of Parylene powder in an iron-based soft magnetic composite material. The inventor unexpectedly found that the Parylene powder is used as a lubricant in the compression molding of the iron-based soft magnetic composite material, the residue is less after annealing, and the magnetic property of the SMC is better.
The technical scheme of the invention is as follows:
The invention provides an application method of Parylene powder in an iron-based soft magnetic composite material, which comprises the following steps,
S1, placing insulated coated iron-based metal magnetic powder in a roller of a deposition area of coating equipment, placing Parylene powder in a cavity of the coating equipment, heating and sublimating the Parylene powder at a vacuum degree lower than 10Pa, and depositing the Parylene powder on the surface of the iron-based metal magnetic powder to obtain second coated powder; the rotation speed of the drum during deposition is 40-150 rpm and the temperature is room temperature, such as 10-30 ℃. In the invention, the weight of the Parylene powder deposited on the surface of the iron-based metal magnetic powder can reach more than 0.1 percent of the weight of the iron-based metal magnetic powder.
S2, pressing and forming the second coating powder obtained in the step S1, and annealing to obtain the soft magnetic composite material.
In a preferred embodiment of the present invention, the insulating coating layer of the insulating coated iron-based metal magnetic powder in step S1 is selected from one or more of alumina, silica, titania, zinc oxide, magnesia and zirconia, or a product of a chemical reaction of at least two of them. In the preparation of soft magnetic composite materials, in order to reduce the electrical resistance of the metal magnetic powder and improve the insulation property, one or more high-temperature-resistant inorganic oxide insulating layers are generally coated on the surface of the metal magnetic powder. For example, CN109273235A coats an inorganic salt/oxide composite insulating layer on the surface of the metal magnetic powder through a sol-gel process, and CN110405201a forms a coating layer with content gradient distribution on the surface of the ferromagnetic powder through silicon dioxide and other coating components.
In a preferred embodiment of the present invention, the insulating coating layer for insulating and coating the iron-based metal magnetic powder in step S1 is a single-layer coating layer or a multi-layer coating layer.
In a preferred embodiment of the present invention, the iron-based metal magnetic powder in step S1 is selected from one of Fe powder, fe-Si-Al powder, fe-Ni powder, fe-Co powder, fe-P powder and Fe-Al powder.
In a preferred embodiment of the present invention, the Parylene powder in step S1 is one or more selected from PARYLENE N, PARYLENE C, PARYLENE D, PARYLENE F and PARYLENE HT. In a more preferred embodiment, the Parylene powder is selected from PARYLENE N, PARYLENE F or PARYLENE HT.
In a preferred embodiment of the present invention, the heating temperature of the heating sublimation in step S1 is 150 to 250 ℃.
In a preferred embodiment of the present invention, the pressing pressure of the press molding in the step S2 is 700 to 2500MPa. The pressing molding can be carried out under 700-1500 MPa for 30-50 s and then under 1200-2500 MPa for 30-50 s.
In a preferred embodiment of the present invention, the annealing in step S2 is performed under negative pressure, and the annealing temperature is 100 to 800 ℃. The negative pressure may be a pressure lower than 100Pa, or lower, such as 20Pa.
The beneficial effects of the invention are as follows:
(1) The invention adopts the Parylene powder as the lubricant for the compression molding of the insulated coated iron-based metal powder, the compression process is smooth, the molding is good, and the annealed soft magnetic composite material has low carbon content and high strength.
(2) Conventionally, zinc stearate or the like is used as a lubricant, and these lubricants are solid particles, and when mixed with the insulation-coated iron-based metal powder, the insulation-coated iron-based metal powder and the lubricant are uniformly mixed from a macroscopic whole, but from a microscopic particle scale, there is a significant unevenness between the particles, and thus, the actual unevenness, resulting in a large excess of the required lubricant. The application adopts the Parylene as the lubricant, the surface of the iron-based metal powder which is coated by insulation after sublimation is more uniform, and a coating layer is actually formed, so that the quantity of the lubricant which is actually required is greatly reduced, and the removal of the lubricant in the subsequent annealing process is also facilitated.
Detailed Description
The technical scheme of the invention is further described and illustrated below according to various embodiments. The parts are by weight in the examples below, unless otherwise indicated.
The insulating coated iron powder in each of the following examples and comparative examples was prepared as follows: the water atomized iron powder with carbon content not more than 0.01wt% and powder apparent density of 3.2g/cm 3 is prepared by mixing three fineness of 80 mesh, 120 mesh and 350 mesh according to weight ratio of 1.5:1.4:0.8. An insulation-coated iron powder (hereinafter, simply referred to as coated iron powder in each of examples and comparative examples) was prepared by referring to the method of example 1 in CN 109273235A.
Example 1
10 Parts of coated iron powder was placed in a drum in the deposition zone of the coating apparatus at a rotational speed of 80rpm. And 2 parts of Parylene powder is placed in a cavity of a coating device, PARYLENE N powder is heated to 160 ℃ for sublimation under the vacuum degree lower than 10Pa, and is deposited on the surface of coated iron powder at 25 ℃ to obtain second coated powder. The deposition time is controlled, and the weight of PARYLENE N powder deposited on the surface of the coated iron powder accounts for (0.3+/-0.015)% of the weight of the coated iron powder.
Example 2
10 Parts of coated iron powder was placed in a drum in the deposition zone of the coating apparatus at a rotational speed of 80rpm. And 2 parts of Parylene powder is placed in a cavity of a coating device, PARYLENE F powder is heated to 210 ℃ for sublimation under the vacuum degree lower than 10Pa, and is deposited on the surface of the coated iron powder at 20 ℃ to obtain second coated powder. The deposition time is controlled, and the weight of PARYLENE F powder deposited on the surface of the coated iron powder accounts for (0.6+/-0.02) percent of the weight of the coated iron powder.
Example 3
10 Parts of coated iron powder was placed in a drum in the deposition zone of the coating apparatus at a rotational speed of 80rpm. And 2 parts of Parylene powder is placed in a cavity of a coating device, PARYLENE HT powder is heated to 200 ℃ for sublimation under the vacuum degree lower than 10Pa, and is deposited on the surface of the coated iron powder at 28 ℃ to obtain second coated powder. The deposition time is controlled, and the weight of PARYLENE HT powder deposited on the surface of the coated iron powder accounts for (0.1+/-0.01) percent of the weight of the coated iron powder.
Example 4
10 Parts of coated iron powder was placed in a drum in the deposition zone of the coating apparatus at a rotational speed of 80rpm. And 2 parts of Parylene powder is placed in a cavity of a coating device, PARYLENE N powder is heated to 160 ℃ for sublimation under the vacuum degree lower than 10Pa, and is deposited on the surface of coated iron powder at 25 ℃ to obtain second coated powder. The deposition time is controlled, and the weight of PARYLENE N powder deposited on the surface of the coated iron powder accounts for (0.4+/-0.02) percent of the weight of the coated iron powder.
Example 5
10 Parts of coated iron powder was placed in a drum in the deposition zone of the coating apparatus at a rotational speed of 80rpm. And 2 parts of Parylene powder is placed in a cavity of a coating device, PARYLENE N powder is heated to 160 ℃ for sublimation under the vacuum degree lower than 10Pa, and is deposited on the surface of the coated iron powder at 15 ℃ to obtain second coated powder. The deposition time is controlled, and the weight of PARYLENE N powder deposited on the surface of the coated iron powder accounts for (0.8+/-0.02) percent of the weight of the coated iron powder.
Example 6
10 Parts of coated iron powder was placed in a drum in the deposition zone of the coating apparatus at a rotational speed of 80rpm. And 2 parts of Parylene powder is placed in a cavity of a coating device, PARYLENE N powder is heated to 160 ℃ for sublimation under the vacuum degree lower than 10Pa, and is deposited on the surface of coated iron powder at 25 ℃ to obtain second coated powder. The deposition time is controlled, and the weight of PARYLENE N powder deposited on the surface of the coated iron powder accounts for (0.08+/-0.01) percent of the weight of the coated iron powder.
Comparative example 1
Zinc stearate accounting for 0.1 weight percent of the coated iron powder is added into the coated iron powder and is stirred uniformly.
Comparative example 2
Zinc stearate accounting for 0.3 weight percent of the coated iron powder is added into the coated iron powder and is stirred uniformly.
Comparative example 3
Zinc stearate accounting for 0.4 weight percent of the coated iron powder is added into the coated iron powder and stirred uniformly.
Comparative example 4
Zinc stearate accounting for 0.6wt% of the weight of the coated iron powder is added into the coated iron powder and is stirred uniformly.
Comparative example 5
Zinc stearate accounting for 0.8 weight percent of the coated iron powder is added into the coated iron powder and stirred uniformly.
Comparative example 6
Zinc stearate accounting for 0.08 weight percent of the coated iron powder is added into the coated iron powder and is stirred uniformly.
Comparative example 7
Referring to the method of coating the Parylene coating of example 1 in CN108183012a, PARYLENE N powder was used, and the Parylene coating was (0.1±0.01)% based on the weight of the coated iron powder.
Performance test:
The coated iron powders obtained by adding the lubricants in examples 1 to 6 and comparative examples 1 to 7 were pressed at 850MPa for 40s and at 2060MPa for 35s, respectively; and then annealing is carried out under negative pressure lower than 20Pa, the temperature is kept constant for 30 minutes at 120 ℃, the temperature is kept constant for 30 minutes at 210 ℃, the temperature is kept constant for 50 minutes at 450 ℃, the temperature is kept constant for 120 minutes at 720 ℃, and the temperature is reduced, so that the soft magnetic composite material is obtained.
The pressing effect is as follows: and observing whether demolding is normal.
Intensity: the test piece size was 30mm by 12mm by 6mm according to GB/T5319-2002 method for determination of transverse rupture Strength of sintered powder metallurgy Material (excluding cemented carbide).
Carbon content: the test was performed by the high-frequency combustion-infrared absorption method.
Total loss Ps: the test was performed with an AC B-H meter at 100mT and 100 KHz. The compression ring is wound, and the primary coil and the secondary coil are respectively 20 turns.
The results are shown in Table 1.
TABLE 1
Therefore, the invention adopts the Parylene powder as the lubricant in the compression molding of the iron-based soft magnetic composite material, has better demoulding effect on lower addition amount, can be removed more completely during annealing, has low carbon content, and has better saturation magnetic induction intensity, eddy current loss and mechanical strength.
As described above, the basic principles, main features and advantages of the present invention are shown and described. It will be appreciated by persons skilled in the art that the present invention is not limited to the embodiments described above, which are preferred embodiments of the present invention, and the scope of the invention is not limited thereto, i.e. equivalent changes and modifications as defined by the claims and the description herein should be made while remaining within the scope of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The application method of the Parylene powder in the iron-based soft magnetic composite material is characterized by comprising the following steps,
S1, placing insulated coated iron-based metal magnetic powder in a roller of a deposition area of coating equipment, placing Parylene powder in a cavity of the coating equipment, heating and sublimating the Parylene powder at a vacuum degree lower than 10Pa, and depositing the Parylene powder on the surface of the iron-based metal magnetic powder to obtain second coated powder; the weight of the Parylene powder deposited on the surface of the iron-based metal magnetic powder is more than 0.1 percent of the weight of the iron-based metal magnetic powder;
S2, pressing and forming the second coating powder obtained in the step S1, and annealing to obtain the soft magnetic composite material;
The annealing is performed under the negative pressure lower than 20Pa, the constant temperature is kept for 30 minutes at 120 ℃, the constant temperature is kept for 30 minutes at 210 ℃, the constant temperature is kept for 50 minutes at 450 ℃, the constant temperature is kept for 120 minutes at 720 ℃, and the temperature is reduced.
2. The application method according to claim 1, wherein the insulating coating layer of the insulating coated iron-based metal magnetic powder in step S1 is selected from one or more of alumina, silica, titania, zinc oxide, magnesia and zirconia, or a product of a chemical reaction of at least two of them.
3. The application method according to claim 1, wherein the insulating coating layer of the insulating coated iron-based metal magnetic powder in step S1 is a single-layer coating layer or a multi-layer coating layer.
4. The application method according to claim 1, wherein the iron-based metal magnetic powder in step S1 is one selected from the group consisting of Fe powder, fe-Si-Al powder, fe-Ni powder, fe-Co powder, fe-P powder and Fe-Al powder.
5. The application method according to claim 1, wherein the Parylene powder in step S1 is one or more selected from PARYLENE N, PARYLENE C, PARYLENE D, PARYLENE F and PARYLENE HT.
6. The method of claim 1, wherein the heating sublimation in step S1 is performed at a heating temperature of 150-250 ℃.
7. The application method according to claim 1, wherein the compression pressure of the compression molding in the step S2 is 700 to 2500MPa.
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| CN108183012A (en) * | 2017-12-25 | 2018-06-19 | 郑州轻工业学院 | A kind of insulating wrapped processing method for improving iron-based soft magnetic composite material pressed density |
| CN110706912A (en) * | 2019-09-09 | 2020-01-17 | 中国科学院宁波材料技术与工程研究所 | Preparation method of amorphous nanocrystalline soft magnetic powder core |
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| CN108183012A (en) * | 2017-12-25 | 2018-06-19 | 郑州轻工业学院 | A kind of insulating wrapped processing method for improving iron-based soft magnetic composite material pressed density |
| CN110706912A (en) * | 2019-09-09 | 2020-01-17 | 中国科学院宁波材料技术与工程研究所 | Preparation method of amorphous nanocrystalline soft magnetic powder core |
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