CN103996479B - Manufacturing method of sendust core with magnetic permeability mue 200 - Google Patents
Manufacturing method of sendust core with magnetic permeability mue 200 Download PDFInfo
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- CN103996479B CN103996479B CN201410220326.5A CN201410220326A CN103996479B CN 103996479 B CN103996479 B CN 103996479B CN 201410220326 A CN201410220326 A CN 201410220326A CN 103996479 B CN103996479 B CN 103996479B
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Abstract
The invention provides a manufacturing method of a sendust core with effective magnetic permeability mue 200. The manufacturing method comprises the following steps of (a) taking sendust in an appropriate particle size range ranging from -100 meshes to -325meshes, wherein the sendust comprises, by mass, Si 7.7-9.8%, Al 5.2-6.6% and the balance Fe; (b) preheating and activating the sendust and adding an insulation cladding agent when the temperature reaches to 60-80 DEG C, wherein the adding amount is 0.05%-2.0% of the sendust weight, the insulation cladding agent is a phosphoric anhydride solution, and heating and drying are performed at the temperature ranging 30 DEG C to 150 DEG C; (c) performing cooling and then adding an insulation filling agent to perform even mechanical mixing; (d) adding a bonding agent to perform even mechanical mixing; (e) adding a demolding lubricant to perform even mechanical mixing; (f) performing compression molding; (g) performing heat treatment to obtain a target product. The sendust core manufactured by adopting the method is high in effective magnetic permeability, low in volume power consumption density and low in cost.
Description
Technical field
The present invention relates to soft magnetic material manufactures field, particularly a kind of magnetic permeability mueThe system of 200 Fe-Si-Al magnetic core
Make method.
Background technology
Fe-Si-Al magnetic core referred to as sendust powder core or referred to as kool mu powder core in the world, China is referred to as iron sial
Powder core.Fe-Si-Al magnetic core has μeSeveral trades mark such as=26,40,60,75,90,125,147.Fe-Si-Al magnetic core industry is near
Year emerges rapidly in China, and present Fe-Si-Al magnetic core develops all fast than any magnetic material.Compared to iron silicon for ferrocart core
Aluminium energy-conservation reaches 80%, is a kind of high-tech novel electron energy-saving material.
With the development of energy technology, energy-saving and emission-reduction, sustainable development are the important component parts of national development strategy.Electricity
Sub- technical field is increasingly paid attention to by power electronics industry to low-loss development trend.Fe-Si-Al magnetic core is extensively applied
In high current, high DC stacked electronic product.Require high frequency and little with the Switching Power Supply that power electronics industry uses
Type, therefore will have efficient soft magnetic materials, and specific requirement has high magnetic permeability in frequency 10khz～200khz scope, low
Loss, good alternating current-direct current is superimposed the powder core of the performance magnetic core to make inductance.
Content of the invention
In order to solve the above problems, the present invention provides a kind of magnetic permeability mueThe manufacture method of 200 Fe-Si-Al magnetic core, system
The Fe-Si-Al magnetic core effective permeability obtaining is high, and summation watt rating loss density is low, and low cost.
Effective permeability μeThe manufacture method of 200 Fe-Si-Al magnetic core, comprises the following steps:
A) take appropriate iron aluminum silicon powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again through 800～
1000 DEG C of annealing, particle size range is -100～-325 mesh；Iron aluminum silicon powder mass fraction is 7.7～9.8% si, 5.2～
The 6.6% al and fe of surplus.
B) iron sial powder good for proportioning is carried out pre- thermal activation, reach addition insulating wrapped when 60 DEG C～80 DEG C to temperature
Agent, addition is the 0.05%～2.0% of iron aluminum silicon powder weight, and insulating wrapped agent is phosphoric anhydride solid, and it is after 20 times of dilution
Add, continue to be heated to drying at 30 DEG C～150 DEG C.
C) add insulation filling agent mechanical mixture after cooling down uniformly, addition be iron aluminum silicon powder weight 0.1%～
5.0%.
D) add bonding agent, addition is the 0.05%～0.3% of iron aluminum silicon powder weight, and mechanical mixture is uniform.
E) add demoulding lubricant, addition is the 0.3%～0.6% of iron aluminum silicon powder weight, and mechanical mixture is uniform.
F) compressing, typed pressure: 23～25tf/cm2.
G) it is heat-treated: 720～780 DEG C of temperature, carry out 20～120 minutes in nitrogen protection, you can obtain target product.
The solvent of phosphoric acid anhydride solution be following any one: deionized water, acetone, alcohol.
Described insulation filling agent be following any one: mica, kaolin, talcum powder.
Described bonding agent be following any one: molybdenum sulfide, waterglass.
Described demoulding lubricant be following any one: molybdenum bisuphide, zinc stearate, aluminum stearate, barium stearate.
Described compressing green density is 6.0～6.5g/cm3.
Effective permeability μ of the present inventioneThe manufacture method of 200 Fe-Si-Al magnetic core has the advantage that
1) adopt cheap iron aluminum silicon powder, greatly reduce production cost；
2) adopt multiple suitable particle size proportionings, make magnetic core reach high Effective permeability, low summation watt rating loss is close
Degree；
3) adopt New insulated covering, so that magnetic core defines high Effective permeability, high direct current biasing performance
With low summation watt rating loss density.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of not making creative work
Apply example, broadly fall into the scope of protection of the invention.
Magnetic permeability μeThe manufacture method of 200 Fe-Si-Al magnetic core, comprises the following steps:
A) take appropriate iron aluminum silicon powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again through 800～
1000 DEG C of annealing, then carry out grain size proportion, and particle size range is -100～-325 mesh；Iron aluminum silicon powder mass fraction be 7.7～
9.8% si, 5.2～6.6% al and the fe of surplus.
B) iron aluminum silicon powder is carried out pre- thermal activation, reach addition insulating wrapped agent, addition when 60 DEG C～80 DEG C to temperature
For the 0.05%～2.0% of iron aluminum silicon powder weight, insulating wrapped agent is phosphoric anhydride solid, and it adds through after 20 times of dilution, molten
Agent is one or more of deionized water, acetone, alcohol, continues to be heated to drying at 30 DEG C～150 DEG C.
C) insulation filling agent mechanical mixture are added after cooling down uniformly, insulation filling agent is mica, in kaolin, talcum powder
One or more, insulation filling agent addition be iron aluminum silicon powder weight 0.1%～5.0%.
D) add bonding agent and mechanical mixture is uniformly, bonding agent is molybdenum sulfide and/or waterglass, bonding agent addition is iron
The 0.05%～0.3% of aluminum silicon powder weight.
E) demoulding lubricant mechanical mixture are added uniformly, releasing agent is molybdenum bisuphide, zinc stearate, aluminum stearate, hard
One or more of resin acid barium, addition is the 0.3%～0.6% of iron aluminum silicon powder weight.
F) compressing, typed pressure: 23～25tf/cm2；Green density after compression molding is 6.0～6.5g/cm3.
G) it is heat-treated: 720～780 DEG C of temperature, carry out 20～120 minutes in nitrogen protection, obtain target product.
Present invention test uses instrument lcr electric impedance analyzer, 1～1mhz, 0～20a.
Effective permeability μeAnd quality factor q, with external diameter 26.92mm, the iron sial of internal diameter 14.73mm, height 11.18mm
Powder core measures for representative, coiling 26 circle, ф 0.50mm enamel-cover line footpath；V=1.0 lies prostrate, and other specification powder cores can
Use the different numbers of turn, 13 circles, 20 circles, 34 circles etc., carry out similar test.
DC stacked, often with certain dc component in high frequency ac circuit, provide certain operation level, thus
Make D.C. magnetic field produce with AC magnetic field to be superimposed, we term it DC stacked.
DC stacked measurement, coiling 26 circle, f=100khz, ф 0.50mm enamel-cover line footpath；Other specification powder cores can
Use the different numbers of turn, 13 circles, 20 circles, 34 circles etc., carry out similar test.
Embodiment 1:
A) first take appropriate sendust powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again
Anneal through 800～1000 DEG C, sendust powder includes the si of 9.6%wt, the al of 5.6%wt, remaining is fe, then carries out grain
Degree proportioning.Allocation ratio is: -100 mesh～+120 mesh account for 1%, and -120 mesh～+200 mesh account for 14%, and -200 mesh～+325 mesh account for
35%, -325 mesh account for 50%.
B) iron sial powder good for proportioning is carried out pre- thermal activation, reach addition insulating wrapped agent when 60 DEG C to temperature, absolutely
Edge covering is the 0.2% of iron aluminum silicon powder weight for addition, and wherein insulating wrapped agent is phosphoric anhydride solid, and it is through 20 times of dilution
After add, solvent be deionized water, continue be heated to drying at 80 DEG C.
C) add insulation filling agent after cooling down, insulation filling agent is talcum powder, addition is iron aluminum silicon powder weight
0.15%, mechanical mixture is uniform.
D) it is subsequently added into bonding agent, bonding agent is molybdenum sulfide and/or waterglass, addition is iron aluminum silicon powder weight
1.0%, mechanical mixture is uniform.
E) it is subsequently adding demoulding lubricant, releasing agent is aluminum stearate, addition is the 0.5% of iron aluminum silicon powder weight, machine
Tool mixes.
F) it is pressed into annular powder core according to the different size of internal diameter, external diameter, height, pressure is 25tf/cm2；To suppress
The powder core of shaping, compressing green density is 6.5g/cm3.
G) it is heat-treated, 780 DEG C of temperature, is carried out in nitrogen 90 minutes, obtained final products.
Table 1, table 2 and table 3 are the data that the measurement of the present embodiment final products obtains, magnetic permeability μeFor 185～203, when frequency
When rate is 50khz and 100khz, magnetic permeability μeIt is respectively 203 and 200, inductance value l error range is ± 8%.
Table 1: Effective permeability μeAnd quality factor q
L=a is met during 100khzl×n2×10-3=251 × 262×10-3=169.7 (μ h) (± 8%)
Table 2: DC stacked performance
Table 3: drain performance
Embodiment 2:
A) first take appropriate sendust powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again
Anneal through 800～1000 DEG C, sendust powder includes the si of 7.7%wt, the al of 5.8%wt, remaining is fe, then carries out grain
Degree proportioning.Allocation ratio is: -100 mesh～+120 mesh account for 0%, and -120 mesh～+200 mesh account for 10%, and -200 mesh～+325 mesh account for
35%, -325 mesh account for 55%.
B) iron sial powder good for proportioning is carried out pre- thermal activation, reach addition insulating wrapped agent when 60 DEG C to temperature, its
Middle insulating wrapped agent adopts phosphoric anhydride solid, and insulating wrapped agent addition is the 0.1% of iron aluminum silicon powder weight, and solvent is alcohol,
Add after diluting 20 times, be heated to drying at 30 DEG C～150 DEG C.
C) add insulation filling agent after cooling down, insulation filling agent is kaolin, addition is iron aluminum silicon powder weight
0.3%, mechanical mixture is uniform.
D) add bonding agent, bonding agent is molybdenum sulfide and/or waterglass, addition is the 0.6% of iron aluminum silicon powder weight, machine
Tool mixes.
E) add demoulding lubricant, releasing agent is molybdenum bisuphide, addition is the 0.5% of iron aluminum silicon powder weight, and machinery is mixed
Close uniformly.
F) it is pressed into annular powder core according to the different size of internal diameter, external diameter, height, pressure is 25tf/cm2；To suppress
The powder core of shaping, compressing green density is 6.5g/cm3.
G) it is heat-treated, 750 DEG C of temperature, carry out in nitrogen 80 minutes, obtain final products.
Table 4, table 5 and table 6 are the data that the measurement of the present embodiment final products obtains, magnetic permeability μeFor 184～203, when frequency
When rate is 50khz and 100khz, magnetic permeability μeIt is respectively 201 and 200, inductance value l error range is ± 8%.
Table 4: Effective permeability μeAnd quality factor q
L=a is met during 100khzl×n2×10-3=251 × 262×10-3=169.7 (μ h) (± 8%)
Table 5: DC stacked performance
Table 6: drain performance
Embodiment 3:
A) first take appropriate sendust powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again
Anneal through 800～1000 DEG C, sendust powder includes the si of 8.8%wt, the al of 6.5%wt, remaining is fe, then carries out grain
Degree proportioning.Allocation ratio is: -100 mesh～+120 mesh account for 0%, and -120 mesh～+200 mesh account for 5%, and -200 mesh～+325 mesh account for
35%, -325 mesh account for 60%.
B) iron sial powder good for proportioning is carried out pre- thermal activation, reach addition insulating wrapped agent when 60 DEG C to temperature, its
Middle insulating wrapped agent adopts phosphoric anhydride solid, and insulating wrapped agent addition is the 2.0% of iron aluminum silicon powder weight, and solvent is deionization
Water, adds after diluting 20 times, is heated to drying at 30 DEG C～150 DEG C.
C) add insulation filling agent after cooling down, insulation filling agent is mica, addition is the 0.1% of iron aluminum silicon powder weight,
Mechanical mixture is uniform.
D) add bonding agent, bonding agent is waterglass, addition is the 0.5% of iron aluminum silicon powder weight, and mechanical mixture is uniform.
E) add demoulding lubricant, releasing agent is the 0.3% of iron aluminum silicon powder weight for barium stearate addition, mechanical mixture
Uniformly.
F) it is pressed into annular powder core according to the different size of internal diameter, external diameter, height, pressure is 23tf/cm2；To suppress
Green density after the powder core compression molding of shaping is 6.0g/cm3.
G) it is heat-treated, 720 DEG C of temperature, carry out in nitrogen 70 minutes, obtain final products.
Table 7, table 8 and table 9 are the data that the measurement of the present embodiment final products obtains, magnetic permeability μeFor 181～199, when frequency
When rate is 50khz and 100khz, magnetic permeability μeIt is respectively 198 and 197, inductance value l error range is ± 8%.
Table 7: Effective permeability μeAnd quality factor q
L=a is met during 100khzl×n2×10-3=251 × 262×10-3=169.7 (μ h) (± 8%)
Table 8: DC stacked performance
Table 9: drain performance
Embodiment 4:
A) first take appropriate sendust powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again
Anneal through 800～1000 DEG C, sendust powder includes the si of 9.8%wt, the al of 6.2%wt, remaining is fe, then carries out grain
Degree proportioning.Allocation ratio is: -100 mesh～+120 mesh account for 1%, and -120 mesh～+200 mesh account for 14%, and -200 mesh～+325 mesh account for
35%, -325 mesh account for 50%.
B) iron sial powder good for proportioning is carried out pre- thermal activation, reach addition insulating wrapped agent when 60 DEG C to temperature, its
Middle insulating wrapped agent adopts phosphoric anhydride solid, and insulating wrapped agent addition is the 0.05% of iron aluminum silicon powder weight, and solvent is third
Ketone, adds after diluting 20 times, is heated to drying at 80 DEG C.
C) add insulation filling agent after cooling down, insulation filling agent is mica, addition is the 0.15% of iron aluminum silicon powder weight,
Mechanical mixture is uniform.
D) add bonding agent, bonding agent is molybdenum sulfide, addition is the 1.0% of iron aluminum silicon powder weight, and mechanical mixture is uniform.
E) add demoulding lubricant, releasing agent is aluminum stearate, addition is the 0.5% of iron aluminum silicon powder weight, and machinery is mixed
Close uniformly.
F) it is pressed into annular powder core according to the different size of internal diameter, external diameter, height, pressure is 25tf/cm2；To suppress
The powder core of shaping, the green density after compression molding is 6.3g/cm3.
G) it is heat-treated, 780 DEG C of temperature, carry out in nitrogen 90 minutes, obtain final products.
Table 10, table 11 and table 12 are the data that the measurement of the present embodiment final products obtains, magnetic permeability μeFor 185～204, when
When frequency is 50khz and 100khz, magnetic permeability μeIt is respectively 203 and 200, inductance value l error range is ± 8%.
Table 10: Effective permeability μeAnd quality factor q
L=a is met during 100khzl×n2×10-3=251 × 262×10-3=169.7 (μ h) (± 8%)
Table 8: DC stacked performance
Table 9: drain performance
Embodiment 5:
A) first take appropriate sendust powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again
Anneal through 800～1000 DEG C, sendust powder includes the si of 9.5%wt, the al of 6.2%wt, remaining is fe, then carries out grain
Degree proportioning.Allocation ratio is: -100 mesh～+120 mesh account for 0%, and -120 mesh～+200 mesh account for 10%, and -200 mesh～+325 mesh account for
35%, -325 mesh account for 55%.
B) iron sial powder good for proportioning is carried out pre- thermal activation, reach addition insulating wrapped agent when 60 DEG C to temperature, its
Middle insulating wrapped agent adopts phosphoric anhydride solid, and insulating wrapped agent addition is the 1.0% of iron aluminum silicon powder weight, and solvent is acetone,
Add after diluting 20 times, be heated to drying at 30 DEG C～150 DEG C.
C) add insulation filling agent after cooling down, insulation filling agent is kaolin, and addition is iron aluminum silicon powder weight
0.15%, mechanical mixture is uniform.
D) add bonding agent, bonding agent is waterglass, addition is the 0.3% of iron aluminum silicon powder weight, and mechanical mixture is uniform.
E) add demoulding lubricant, releasing agent is zinc stearate, addition is the 0.6% of iron aluminum silicon powder weight, and machinery is mixed
Close uniformly.
F) it is pressed into annular powder core according to the different size of internal diameter, external diameter, height, pressure is 25tf/cm2；To suppress
The powder core of shaping, the green density after compression molding is 6.3g/cm3.
G) it is heat-treated, 750 DEG C of temperature, carry out in nitrogen 80 minutes, obtain final products.
Table 13, table 14 and table 15 are the data that the measurement of the present embodiment final products obtains, magnetic permeability μeFor 184～203, when
When frequency is 50khz and 100khz, magnetic permeability μeIt is respectively 201 and 200, inductance value l error range is ± 8%.
Table 13: Effective permeability μeAnd quality factor q
L=a is met during 100khzl×n2×10-3=251 × 262×10-3=169.7 (μ h) (± 8%)
Table 8: DC stacked performance
Table 9: drain performance
Embodiment 6:
A) first take appropriate sendust powder, it is obtained by the method for vacuum induction melting, after crushing through Mechanical Method again
Anneal through 800～1000 DEG C, sendust powder includes the si of 9.5%wt, the al of 6.2%wt, remaining is fe, then carries out grain
Degree proportioning.Allocation ratio is: -100 mesh～+120 mesh account for 0%, and -120 mesh～+200 mesh account for 5%, and -200 mesh～+325 mesh account for
35%, -325 mesh account for 60%.
B) iron sial powder good for proportioning is carried out pre- thermal activation, reach addition insulating wrapped agent when 60 DEG C to temperature, its
Middle insulating wrapped agent adopts phosphoric anhydride solid, and insulating wrapped agent addition is the 2.0% of iron aluminum silicon powder weight, and solvent is alcohol,
Add after diluting 20 times, be heated to drying at 30 DEG C～150 DEG C.
C) add insulation filling agent after cooling down, insulation filling agent is kaolin, addition is iron aluminum silicon powder weight
0.1%, mechanical mixture is uniform.
D) add bonding agent, bonding agent is molybdenum sulfide, addition is the 0.5% of iron aluminum silicon powder weight, and mechanical mixture is uniform.
E) add demoulding lubricant, releasing agent is molybdenum bisuphide, addition is the 0.3% of iron aluminum silicon powder weight, and machinery is mixed
Close uniformly.
F) it is pressed into annular powder core according to the different size of internal diameter, external diameter, height, pressure is 23tf/cm2；To suppress
The powder core of shaping, the green density after compression molding is 6.2g/cm3.
G) it is heat-treated, 720 DEG C of temperature, carry out in nitrogen 70 minutes, obtain final products.
Table 16, table 17 and table 18 are the data that the measurement of the present embodiment final products obtains, magnetic permeability μeFor 181.5～199,
When frequency is for 50khz and 100khz, magnetic permeability μeIt is respectively 197.7 and 196.8, inductance value l error range is ± 8%.
Table 16: Effective permeability μeAnd quality factor q
L=a is met during 100khzl×n2×10-3=251 × 262×10-3=169.7 (μ h) (± 8%)
Table 17: DC stacked performance
Table 18: drain performance
Effective permeability μ of the present inventioneThe manufacture method of 200 Fe-Si-Al magnetic core has the advantage that
1) adopt cheap iron aluminum silicon powder, greatly reduce production cost；
2) adopt multiple suitable particle size proportionings, make magnetic core reach high Effective permeability, low summation watt rating loss density；
3) adopt New insulated covering, so that magnetic core defines high Effective permeability, high direct current biasing performance
With low summation watt rating loss density.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (4)
1. a kind of Effective permeability μeThe manufacture method of 200 Fe-Si-Al magnetic core is it is characterised in that comprise the following steps:
A) take appropriate iron aluminum silicon powder, it is obtained by the method for vacuum induction melting, again through 800～1000 DEG C after crushing through Mechanical Method
Annealing, particle size range is -100～-325 mesh；Iron aluminum silicon powder mass fraction is 7.7～9.8% si, 5.2～6.6% al and
The fe of surplus；
B) iron sial powder good for proportioning is carried out pre- thermal activation, reaches addition insulating wrapped agent when 60 DEG C～80 DEG C to temperature,
Addition is the 0.05%～2.0% of iron aluminum silicon powder weight, and insulating wrapped agent is phosphoric anhydride solid, and it adds after diluting 20 times
Enter, continue to be heated to drying at 30 DEG C～150 DEG C；
C) add insulation filling agent after cooling down and mechanical mixture is uniformly, addition is the 0.1%～5.0% of iron aluminum silicon powder weight；
D) add bonding agent, addition is the 0.05%～0.3% of iron aluminum silicon powder weight, and mechanical mixture is uniform；
E) add demoulding lubricant, addition is the 0.3%～0.6% of iron aluminum silicon powder weight, and mechanical mixture is uniform；
F) compressing, typed pressure: 23～25tf/cm2；
G) it is heat-treated: 720～780 DEG C of temperature, carry out 20～120 minutes in nitrogen protection, you can obtain target product；
The solvent of described phosphoric acid anhydride solution is: acetone or alcohol；Described compressing green density is 6.0～6.5g/cm3.
2. Effective permeability μ according to claim 1eThe manufacture method of 200 Fe-Si-Al magnetic core is it is characterised in that described
Insulation filling agent be following any one: mica, kaolin, talcum powder.
3. Effective permeability μ according to claim 1eThe manufacture method of 200 Fe-Si-Al magnetic core is it is characterised in that described
Bonding agent be following any one: molybdenum sulfide, waterglass.
4. Effective permeability μ according to claim 1eThe manufacture method of 200 Fe-Si-Al magnetic core is it is characterised in that described
Demoulding lubricant be following any one: molybdenum bisuphide, zinc stearate, aluminum stearate, barium stearate.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04272166A (en) * | 1991-02-27 | 1992-09-28 | Kawasaki Steel Corp | Manufacture of ultralow core loss grain-oriented silicon steel sheet |
| CN103551565A (en) * | 2013-10-30 | 2014-02-05 | 武汉欣达磁性材料有限公司 | Manufacturing method for soft-magnetic Fe-Si-Al-Ni alloy powder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002081130A1 (en) * | 2001-04-02 | 2002-10-17 | Mitsubishi Materials Corporation | Composite soft magnetic sintered material having high density and high magnetic permeability and method for preparation thereof |
| JP2002299113A (en) * | 2001-04-03 | 2002-10-11 | Daido Steel Co Ltd | Soft magnetic powder and dust core using the same |
| CN100527292C (en) * | 2006-03-01 | 2009-08-12 | 北京七星飞行电子有限公司 | FeSiAl material magnetic core and producing method thereof |
| CN102623123B (en) * | 2012-04-05 | 2015-04-22 | 天通控股股份有限公司 | Method for manufacturing mu 125 sendust cores |
| CN102938312B (en) * | 2012-11-14 | 2016-10-05 | 胡贤晨 | A kind of manufacture method of ferrum sial metal magnetic powder core |
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2014
- 2014-05-22 CN CN201410220326.5A patent/CN103996479B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04272166A (en) * | 1991-02-27 | 1992-09-28 | Kawasaki Steel Corp | Manufacture of ultralow core loss grain-oriented silicon steel sheet |
| CN103551565A (en) * | 2013-10-30 | 2014-02-05 | 武汉欣达磁性材料有限公司 | Manufacturing method for soft-magnetic Fe-Si-Al-Ni alloy powder |
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