CN111261357A - Iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias and preparation method thereof - Google Patents
Iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias and preparation method thereof Download PDFInfo
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- CN111261357A CN111261357A CN202010055077.4A CN202010055077A CN111261357A CN 111261357 A CN111261357 A CN 111261357A CN 202010055077 A CN202010055077 A CN 202010055077A CN 111261357 A CN111261357 A CN 111261357A
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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
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
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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
- H01F1/20—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
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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
- 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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Abstract
The invention provides a preparation method of an iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias, which comprises the following steps: putting Fe, Si, Al and Ni into a smelting furnace according to the proportion, wherein the proportion of Si is 3-15%, the proportion of Al is 3-10%, the proportion of Ni is 10-25%, and the balance is Fe, and spraying powder by using gas atomization; sieving with a sieve larger than 200 meshes, baking the obtained-200-mesh Fe-Si-Al nickel powder, adding phosphoric acid diluent for surface treatment, and adding organic silicon resin diluent; adding stearic acid amide or calcium stearate as a lubricant; pressing and molding the Fe-Si-Al-Ni powder under the molding pressure of 15-26 tons/cm2(ii) a Carrying out heat treatment on the formed magnetic core, controlling the temperature to be between 600 and 900 ℃, and introducing nitrogen into the furnace for protection for 60-150 minutes; epoxy resin paintCoating on the surface of the material to obtain a finished product.
Description
Technical Field
The invention relates to the technical field of soft magnetic materials and powder metallurgy, in particular to an iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias.
Background
For a long time, the sendust magnetic powder core composed of three elements of Fe, Si and Al is widely applied to various aspects such as alternating current inductance, output inductance, line filter, power factor correction circuit and the like by virtue of the characteristics of low loss, low cost, no noise and the like.
With the development of power electronic technology, higher requirements are also put on magnetic elements. The gas atomization ferro-silicon-aluminum powder gradually replaces the traditional crushing ferro-silicon-aluminum powder by virtue of lower loss and higher direct current offset. Lower losses and higher dc bias capability have been sought. The iron-silicon-aluminum-nickel alloy has the same loss as the iron-silicon-aluminum magnetic core, and the direct current bias is better, so that a better choice is brought to a user. The saturation magnetic induction intensity is about 13000Gs, and the DC bias power is good.
Disclosure of Invention
In order to overcome the defect of the direct current bias capability of the iron-silicon-aluminum magnetic core, the invention provides the magnetic core with higher direct current bias capability, and the working efficiency is further improved.
The invention provides a preparation method of an iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias, which comprises the following steps:
step 1) pulverizing: putting Fe, Si, Al and Ni into a smelting furnace according to the weight ratio, wherein the Si accounts for 3-15%, the Al accounts for 3-10%, the Ni accounts for 10-25% and the balance is Fe, and spraying powder by using gas atomization;
step 2) sieving the Fe-Si-Al-Ni powder prepared in the step 1) by using a sieve with the mesh size larger than 200, and taking the sieved powder for later use;
step 3) roasting the-200-mesh Fe-Si-Al-Ni powder obtained in the step 2) until the temperature reaches 80-120 ℃, adding a phosphoric acid diluent for surface treatment, wherein the weight of the phosphoric acid diluent is 0.2-3.2% of that of the Fe-Si-Al-Ni alloy powder, uniformly mixing, and continuously roasting until the mixture is dried;
step 4) roasting the iron-silicon-aluminum-nickel alloy powder treated in the step 3) until the temperature reaches 70-120 ℃, adding an organic silicon resin dilution solution, wherein the weight of organic silicon resin in the organic silicon resin dilution solution is 0.2-2% of the weight of the iron-silicon-aluminum-nickel alloy powder, uniformly mixing, and continuously roasting until the mixture is dried;
step 5), adding stearic acid amide or calcium stearate as a lubricant and mixing;
step 6) pressing and forming the ferrum-silicon-aluminum-nickel powder under the forming pressure of 15-26 tons/cm2；
Step 7) carrying out heat treatment on the molded magnetic core, controlling the temperature to be between 600 and 900 ℃, and introducing nitrogen into the furnace for protection for 60-150 minutes;
and 8) coating the epoxy resin paint on the surface of the material to obtain a finished product.
In some embodiments, the phosphoric acid diluent has a mass concentration of 1% to 20%.
In some embodiments, the silicone resin diluted solution has a mass concentration of 1% to 10%.
In some embodiments, in step 1), the raw materials are fed into a smelting furnace according to the weight ratio of 75% of Fe, 6% of Si, 4% of Al and 15% of Ni, and gas atomization is used for spraying powder
In some embodiments, the weight of the stearic acid amide or calcium stearate in step 5) is 0.4% of the weight of the sendust powder.
The invention creatively selects the components of Fe, Si, Al and Ni and the proportional relation thereof, effectively improves the saturation magnetic induction intensity and keeps lower loss.
Furthermore, the properties such as loss, direct current bias and the like can be seriously influenced by the over-coarse powder, and the fine powder is obtained by sieving; then, carrying out insulation treatment, forming an insulation layer on the surface of the particles, and then using organic silicon resin as a binder to improve the formability and the forming strength of the product; during compression molding, high pressure is adopted, the density of a product can be improved, and gaps among internal particles are reduced, so that direct current bias is improved, and stress caused during molding is removed through high-temperature heat treatment. The epoxy resin paint is coated on the surface of the material so as to play a role in integral insulation and rust prevention.
In addition, the roasting temperature is selected to be 70-120 ℃ or 80-120 ℃ mainly for drying, the drying is slow when the temperature is too low, and the powder is easily oxidized when the temperature is too high, so that the performance is affected.
The invention has the following beneficial effects: 1. the manufacturing process is simple, and the used equipment is simple; 2. the product has higher saturation magnetic induction intensity which is about 13000 Gs; 3. the product loss is low, and simultaneously, the direct current bias capability is good.
Detailed Description
The following is a detailed description of specific embodiments of the invention.
Example 1
The embodiment provides a preparation method of an iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias, which comprises the following steps:
step 1) putting raw materials into a smelting furnace according to the weight ratio of 75% of Fe, 6% of Si, 4% of Al and 15% of Ni, and spraying powder by using gas atomization;
step 2), sieving the prepared Fe-Si-Al-Ni powder by using a 200-mesh screen to obtain powder of-200 meshes;
step 3) taking 1kg of powder, baking until the temperature reaches 120 ℃, adding 100g of phosphoric acid diluent with the concentration of 10%, uniformly mixing, and then continuously baking until the mixture is dried;
step 4) roasting the iron-silicon-aluminum-nickel alloy powder treated in the step 3) until the temperature reaches 120 ℃, adding 100g of organic silicon resin diluted solution with the concentration of 15%, uniformly mixing, and continuously roasting until the mixture is dried;
step 5), adding stearic acid amide or calcium stearate accounting for 0.4 percent of the weight of the iron-silicon-aluminum-nickel alloy powder as a lubricant, and mixing;
step 6) use 20t/cm2Pressing into a magnetic core with the outer diameter of 26.9mm, the inner diameter of 14.7mm and the height of 11.2 mm;
step 7) carrying out heat treatment on the steel plate, wherein the heat treatment temperature is 800 ℃, the time is 150 minutes, and nitrogen is adopted for protection;
and 8) finally coating the epoxy resin paint on the surface of the material to obtain a finished product.
Example 2
The element proportion is changed into 80 percent of Fe, 8.5 percent of Si, 5.5 percent of Al and 6 percent of Ni, and the rest preparation method is the same as that of the example 1, thus obtaining the finished product.
Example 3
The element proportion is changed into 84 percent of Fe, 10 percent of Si and 6 percent of Al, and the rest preparation method is the same as that of the example 1, so as to obtain a finished product (the gas atomization iron-silicon-aluminum magnetic core).
The following tests were carried out on the cores obtained in the 3 examples described above: l, Q, power loss and DC bias performance test, and the magnetic performance parameters are shown in Table 1
TABLE 1
From the test results shown in table 1, it can be known that, compared with the gas atomization sendust magnetic core, the direct current superposition performance is greatly improved under the condition that the loss is not high;
example 1 differs from a magnetic material disclosed in publication CN105280321A in both composition and compounding ratio, and the loss thereof was 200mW/cm at 50kHz/1000Gs as compared with a magnetic material disclosed in publication CN105280321A3Is equivalent to the present invention. But the direct current superposition performance (100oe) is 58%, while the embodiment 1 of the invention achieves 65%, the saturation magnetic induction intensity is about 11000Gs, the invention is about 13000Gs, and the two points of the invention have great advantages.
It should be emphasized that the above-described embodiments of the present invention are merely preferred examples of implementations, rather than limitations of the invention in any way, and all simple modifications, equivalents and modifications that may be made to the above-described embodiments based on the technical spirit of the present invention are intended to fall within the scope of the present invention.
Claims (6)
1. A preparation method of an iron-silicon-aluminum-nickel magnetic core is characterized by comprising the following steps:
step 1) pulverizing: putting Fe, Si, Al and Ni into a smelting furnace according to the weight ratio, wherein the Si accounts for 3-15%, the Al accounts for 3-10%, the Ni accounts for 10-25% and the balance is Fe, and spraying powder by using gas atomization;
step 2) sieving the Fe-Si-Al-Ni powder prepared in the step 1) by using a sieve with the mesh size larger than 200, and taking the sieved powder for later use;
step 3) roasting the-200-mesh Fe-Si-Al-Ni powder obtained in the step 2) until the temperature reaches 80-120 ℃, adding a phosphoric acid diluent for surface treatment, wherein the weight of the phosphoric acid diluent is 0.2-3.2% of that of the Fe-Si-Al-Ni alloy powder, uniformly mixing, and continuously roasting until the mixture is dried;
step 4) roasting the iron-silicon-aluminum-nickel alloy powder treated in the step 3) until the temperature reaches 70-120 ℃, adding an organic silicon resin dilution solution, wherein the weight of organic silicon resin in the organic silicon resin dilution solution is 0.2-2% of the weight of the iron-silicon-aluminum-nickel alloy powder, uniformly mixing, and continuously roasting until the mixture is dried;
step 5), adding stearic acid amide or calcium stearate as a lubricant and mixing;
step 6), pressing and forming the iron-silicon-aluminum nickel powder, wherein the forming pressure is 15-26 tons/cm 2;
step 7) carrying out heat treatment on the molded magnetic core, controlling the temperature to be between 600 and 900 ℃, and introducing nitrogen into the furnace for protection for 60-150 minutes;
and 8) coating the epoxy resin paint on the surface of the material to obtain a finished product.
2. The method of claim 1, wherein the phosphoric acid diluent has a mass concentration of 1% to 20%.
3. The method of claim 1, wherein the diluted solution of silicone resin has a mass concentration of 1% to 10%.
4. The method according to claim 1, characterized in that in step 1), the raw materials are fed into the smelting furnace according to the weight ratio of 75% of Fe, 6% of Si, 4% of Al and 15% of Ni, and gas atomization is used for spraying.
5. The method of claim 1, wherein the weight of the amide or calcium stearate in step 5) is 0.4% of the weight of the sendust powder.
6. An iron-silicon-aluminum-nickel magnetic core prepared by the method of any one of claims 1 to 5.
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| CN202010055077.4A CN111261357A (en) | 2020-01-17 | 2020-01-17 | Iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias and preparation method thereof |
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| CN202010055077.4A CN111261357A (en) | 2020-01-17 | 2020-01-17 | Iron-silicon-aluminum-nickel magnetic core with low loss and good direct current bias and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55100961A (en) * | 1979-01-22 | 1980-08-01 | Hitachi Metals Ltd | Magnetic material |
| EP0541887A1 (en) * | 1991-08-19 | 1993-05-19 | TDK Corporation | Method of making a composite soft magnetic material and composite soft magnetic material |
| CN1518011A (en) * | 2002-12-26 | 2004-08-04 | ������������ʽ���� | Metal powder and compressed powder magnetic core using the metal powder |
| CN104036902A (en) * | 2014-05-28 | 2014-09-10 | 浙江明贺钢管有限公司 | Preparing method of metal magnetic powder core |
| CN105810382A (en) * | 2014-12-30 | 2016-07-27 | 天长市高新技术创业服务中心 | Preparation method of iron-silicon material |
-
2020
- 2020-01-17 CN CN202010055077.4A patent/CN111261357A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55100961A (en) * | 1979-01-22 | 1980-08-01 | Hitachi Metals Ltd | Magnetic material |
| EP0541887A1 (en) * | 1991-08-19 | 1993-05-19 | TDK Corporation | Method of making a composite soft magnetic material and composite soft magnetic material |
| CN1518011A (en) * | 2002-12-26 | 2004-08-04 | ������������ʽ���� | Metal powder and compressed powder magnetic core using the metal powder |
| CN104036902A (en) * | 2014-05-28 | 2014-09-10 | 浙江明贺钢管有限公司 | Preparing method of metal magnetic powder core |
| CN105810382A (en) * | 2014-12-30 | 2016-07-27 | 天长市高新技术创业服务中心 | Preparation method of iron-silicon material |
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