CN103500644A - Method for manufacturing modified silicon iron boron soft magnetic powder core with magnetic conductivity of 75 - Google Patents
Method for manufacturing modified silicon iron boron soft magnetic powder core with magnetic conductivity of 75 Download PDFInfo
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Abstract
The invention belongs to the field of metal soft magnetic material manufacturing, and particularly relates to a method for manufacturing a modified silicon iron boron soft magnetic powder core with magnetic conductivity of 75. The method comprises the first step of embrittlement treatment, the second step of crushing, the third step of screening and matching, the fourth step of passivating treatment and insulation covering, the fifth step of modifying agent adding, the sixth step of compression moulding and the seventh step of annealing treatment and spraying. According to the method, the noise defect of the silicon iron boron soft magnetic powder core can be overcome, and the high-frequency performance of the silicon iron boron soft magnetic powder core can be improved.
Description
Technical field
The invention belongs to metal soft magnetic material and manufacture field, the preparation method of the Modified Iron silicon boron soft magnetic-powder core that to be specifically related to a kind of magnetic permeability be 75.
Background technology
Since nineteen sixty U.S. professor Duwez has invented and has prepared amorphous alloy with rapid quenching technique, due to its unique institutional framework, efficient preparation technology, the material property of excellence and wide application prospect, be subject to the special concern of material science worker and industrial circle always.Amorphous powder core is a kind of novel composite electron material, is mainly used in Switching Power Supply magnetic core, common mode inductance, high-frequency inverter and zero-sequence transformer etc.
The powder core product mainly contains iron silicon boron magnetic powder core, Fe-Si-Al magnetic core, iron nickel powder core, MPP powder core at present.Comparatively speaking, the iron Si-Al Magnetic Powder Core is inexpensive, and loss and frequency characteristic are better, but the bigoted ability of direct current under large electric current is poor, in some domain restrictions its application; Iron nickel powder core and MPP powder core electromagnetic performance are all relatively good, and the bigoted ability of direct current is also better, but, owing in these two kinds of powder cores, containing noble metal, price is high, makes it be difficult to extensively be applied; Iron silicon boron magnetic powder core has high strength, high rigidity, high anti-corrosion and characteristics such as soft magnet performance preferably, and with low cost, becomes gradually in recent years the focus of research and application.
But conventional iron silicon boron magnetic powder core high frequency characteristics is bad, noise problem is the problem that is difficult to solve and affect its useful life always simultaneously.The main cause that produces noise due to the amorphous ferrocart core is relevant with the magnetostriction coefficient of its composition material, and λ s>0th, the intrinsic characteristic of Fe-Si-B alloy itself, can't realize the situation of λ s=0 as the scheme of FeSiAl by changing proportioning.Therefore, improve the noise defect and become Fe-Si-B amorphous powder core major issue urgently to be resolved hurrily.
For improving the high frequency characteristics of iron silicon boron magnetic powder core, the applicant has submitted the application for a patent for invention that application number is 201310018768.7 " a kind of method for preparing alloy soft magnetic powder core " to, by powder sieving and proportioning, powder core has obtained optimum physical characteristic and composition homogeneity, and there is stable high frequency characteristics, its technical scheme comprises the steps: Fe-based amorphous metal sheet band is heat-treated, and its embrittlement is easily pulverized; Described embrittlement amorphous metal thin strip is pulverized to obtain the amorphous metal powder; Described amorphous metal powder is sieved to the powder particle of the second powder constituent that passes through-270 ~+325 sieve meshes that the first powder that passes through-200 ~+270 sieve meshes that then to be mixed into by weight content be 50 ~ 90% and weight content are 10 ~ 50%; The described amorphous metal powder be mixed into is carried out to passivation and insulating wrapped processing, and then compressing is magnetic core; Magnetic core to described moulding carries out annealing in process, then the magnetic core surface is sprayed to insulation processing.The step that is the preparation method of alloy soft magnetic powder core in this application is followed successively by: powder, screening and proportioning, Passivation Treatment and insulating wrapped, compressing, annealing in process and spraying are processed, are ground in the amorphous band embrittlement, but there is serious noise defect in the iron silicon boron magnetic powder core that adopts the method in this application to prepare.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide the preparation method of the Modified Iron silicon boron soft magnetic-powder core that a kind of magnetic permeability is 75, improve the noise defect of iron silicon boron soft magnetic-powder core, and improve its high frequency characteristics.
Technical scheme provided by the invention is, the preparation method of the Modified Iron silicon boron soft magnetic-powder core that a kind of magnetic permeability is 75, comprise the steps,
Step 1, embrittlement is processed: ferrum-silicon-boron amorphous metal sheet band is heat-treated, its embrittlement is easily pulverized;
Step 2, pulverize: described embrittlement amorphous metal thin strip is pulverized to obtain the amorphous metal powder;
Step 3, screening and proportioning: described amorphous metal powder is sieved to the powder particle of the 4th powder constituent that passes through-325 ~+400 sieve meshes that the 3rd powder that passes through-270 ~+325 sieve meshes that the second powder that passes through-200 ~+270 sieve meshes, the weight content that the first powder that passes through-170 ~+200 sieve meshes, the weight content that then to be mixed into by weight content be 15% ~ 20% is 45% ~ 50% is 25% ~ 30% and weight content are 5% ~ 10%;
Step 4, Passivation Treatment and insulating wrapped: adopt passivator to carry out passivation the powder particle of above-mentioned mixing, then add insulating compound and adhesive to carry out insulating wrapped;
Step 5, add modifier: add modifier in the amorphous powder particle after insulating wrapped, described modifier is selected from the mixture of one or more compositions in Ni powder, iron silica flour and iron nickel powder;
Step 6, compressing: that the amorphous powder particle after interpolation modifier is pressed into to powder core;
Step 7, annealing in process and spraying: the powder core to described moulding carries out annealing in process, then the powder core surface is sprayed to insulation processing.
Optimize, the granularity of the modifier added in step 5 is-500～+ 600 sieve meshes.
Optimize, the weight content of the modifier added in step 5 is 5% ~ 20% of amorphous powder particle.
Optimize the mixture that the modifier added in step 5 is iron silica flour and Ni powder.
Optimize, the part by weight of iron silica flour and Ni powder is 1:1 ~ 2:1.
Optimize, in step 1, embrittlement is processed and is carried out under 200 ~ 400 ℃ 1 ~ 3 hour.
Optimize, in step 4, passivator adopts phosphoric acid liquid, and its addition is 0.05 ~ 0.10% of amorphous powder granular mass; Insulating compound adopts glass powder with low melting point, and addition is 2 ~ 10wt%; Binding agent adopts epoxy resin, and addition is 1 ~ 5wt%.
Optimize, pressure compressing in step 6 adopts 14 ~ 28t/cm
2.
Optimize, in step 7, annealing in process is no more than 6 hours under 380 ~ 480 ℃; It is inorganic agent that the spraying insulation processing adopts epoxy resin.
Preparation method provided by the invention has following beneficial effect: 1, by adding modifier, greatly improved the noise defect of iron silicon boron magnetic powder core; 2, by powder sieving and proportioning, greatly improved the high frequency characteristics of iron silicon boron magnetic powder core, the soft magnetic-powder core that to have obtained magnetic permeability be 75; 3, modifier is the commercially available prod that can buy, and need not carry out complicated processing procedure, only by adding modifier, just can reach the purpose that reduces noise, and method is simple, easy to operate, and cost is lower; 4, the parameters such as the granularity by further optimizing modifier, addition, kind, greatly reduce the noise of powder core, and high energy reduces more than 60%; 5, by embrittlement, process, make the not oxidized easily pulverizing again of amorphous metal band; 6, by compressing and annealing in process, obtained the alloy soft magnetic powder core of even tissue, high strength, high-compactness and high frequency magnetic permeability; 7, by spraying insulation processing, corrosion resistance and the service time of improving soft magnetic-powder core.
Embodiment
Illustrate the present invention below in conjunction with execution mode.
Embodiment 1
The preparation method of the Modified Iron silicon boron soft magnetic-powder core that the present embodiment provides comprises the steps,
Step 1, embrittlement is processed: ferrum-silicon-boron amorphous metal sheet band is carried out under 300 ℃ to the heat treatment of 2 hours, its embrittlement is easily pulverized;
Step 2, pulverize: the amorphous metal thin strip of described embrittlement is pulverized to obtain the amorphous metal powder;
Step 3, screening and proportioning: described amorphous metal powder is sieved to the 3rd powder that passes through-270 ~+325 sieve meshes that the second powder that passes through-200 ~+270 sieve meshes, the weight content that the first powder that passes through-170 ~+200 sieve meshes, the weight content that then to be mixed into by weight content be 15% is 45% is 30% and the powder particle of the 4th powder constituent that passes through-325 ~+400 sieve meshes that weight content is 10%;
Step 4, Passivation Treatment and insulating wrapped: the amorphous powder particle that proportioning is good is poured in mixer, after being uniformly mixed, add the phosphoric acid liquid that plays passivation effect, addition is 0.10% of amorphous powder granular mass, mixes, and at the uniform velocity stirs until dry; Then add the glass powder with low melting point and the epoxy resin that play the insulation adhesive effect to mix, addition is respectively 2% and 1% of amorphous powder granular mass, at the uniform velocity stirs until dry.
Step 5, add modifier: add modifier in the amorphous powder particle after insulating wrapped, described modifier is selected from the mixture of one or more compositions in Ni powder, iron silica flour and iron nickel powder;
Step 6, compressing: the amorphous powder particle after interpolation modifier is pressed into to the annular powder core that specification is external diameter 46.7mm, internal diameter 24.0mm, height 18.0mm, and pressure adopts 20t/cm
2;
Step 7, annealing in process and spraying: the powder core of described moulding is carried out under 440 ℃ to the annealing in process of 3 hours, then adopt epoxy resin to be sprayed insulation processing to the powder core surface.
The present embodiment, by changing kind, addition and the granularity of modifier in step 5, obtains 18 examples, is numbered (1) ~ (18).
Comparative Examples 1
The preparation method of the iron silicon boron soft magnetic-powder core that this Comparative Examples provides comprises the steps,
Step 1, embrittlement is processed: ferrum-silicon-boron amorphous metal sheet band is carried out under 300 ℃ to the heat treatment of 2 hours, its embrittlement is easily pulverized;
Step 2, pulverize: the amorphous metal thin strip of described embrittlement is pulverized to obtain the amorphous metal powder;
Step 3, screening and proportioning: described amorphous metal powder is sieved to the 3rd powder that passes through-270 ~+325 sieve meshes that the second powder that passes through-200 ~+270 sieve meshes, the weight content that the first powder that passes through-170 ~+200 sieve meshes, the weight content that then to be mixed into by weight content be 15% is 45% is 30% and the powder particle of the 4th powder constituent that passes through-325 ~+400 sieve meshes that weight content is 10%;
Step 4, Passivation Treatment and insulating wrapped: the amorphous powder particle that proportioning is good is poured in mixer, after being uniformly mixed, add the phosphoric acid liquid that plays passivation effect, addition is 0.10% of amorphous powder granular mass, mixes, and at the uniform velocity stirs until dry; Then add the glass powder with low melting point and the epoxy resin that play the insulation adhesive effect to mix, addition is respectively 2% and 1% of amorphous powder granular mass, at the uniform velocity stirs until dry.
Step 5, compressing: the amorphous powder particle after interpolation modifier is pressed into to the annular powder core that specification is external diameter 46.7mm, internal diameter 24.0mm, height 18.0mm, and pressure adopts 20t/cm
2;
Step 6, annealing in process and spraying: the powder core of described moulding is carried out under 440 ℃ to the annealing in process of 3 hours, then adopt epoxy resin to be sprayed insulation processing to the powder core surface.
This Comparative Examples is not add modifier with the difference of embodiment 1.
The powder core that example in above-described embodiment 1 and Comparative Examples 1 are obtained with the copper cash of 1.2mm*2 around 90 circles, make the PFC inductance, then it is installed in the air conditioner of laboratory respectively and does the complete machine experiment, p-wire is placed in to the standard anechoic chamber, at voltage 220v, the noise in the load 2kw situation identical with other conditions during each powder core work of test.Be recorded in table 1 ~ table 2.
Table 1
| Numbering | Modifier | The granularity of modifier | The part by weight of each composition | The addition of modifier | Noise (decibel) |
| （1） | The Ni powder | -500～+600 | —— | 2% | 62 |
| （2） | The Ni powder | -500～+600 | —— | 5% | 50 |
| （3） | The Ni powder | -500～+600 | —— | 12% | 41 |
| （4） | The Ni powder | -200～+300 | —— | 12% | 48 |
| （5） | The Ni powder | -300～+400 | —— | 12% | 52 |
| （6） | The Ni powder | -400～+500 | —— | 12% | 45 |
| （7） | The Ni powder | -500～+600 | —— | 20% | 27 |
| （8) | The Ni powder | -500～+600 | —— | 30% | 55 |
| Comparative Examples 1 | —— | —— | —— | —— | 68 |
Example by being numbered (1) ~ (8) in embodiment in table 11 and the contrast of Comparative Examples 1 are known, embodiment provided by the invention is by adding modifier, noise during its work is less than Comparative Examples, has improved the noise defect of iron silicon boron magnetic powder core, is better than Comparative Examples.
The contrast of the example by being numbered (1), (2), (3), (7) and (8) is known, and when the modifier addition is 5% ~ 20%, the noise of powder core is less, lower than 50 decibels, with the noise of Comparative Examples, compares and has reduced more than 1/4; The contrast of the example by being numbered (3) ~ (6) is known, and the granularity of this modifier is-500～+ 600 o'clock, and the operating noise of powder core is less; Therefore the weight content of the preferred modifier of the present invention is 5% ~ 20% of amorphous powder particle, and preferably the granularity of modifier is-500～+ 600 sieve meshes.
Table 2
| Numbering | Modifier | The granularity of modifier | The part by weight of each composition | The addition of modifier | Noise (decibel) |
| (9) | The iron silica flour | -500～+600 | —— | 5% | 49 |
| (10) | The iron silica flour | -500～+600 | —— | 12% | 43 |
| (11) | The iron silica flour | -500～+600 | —— | 20% | 30 |
| (12) | The iron nickel powder | -500～+600 | —— | 12% | 49 |
| （13） | The iron nickel powder | -500～+600 | —— | 20% | 36 |
| （14） | Iron silica flour and Ni powder | -500～+600 | 1：1 | 12% | 25 |
| （15） | Iron silica flour and Ni powder | -500～+600 | 2：1 | 12% | 28 |
| （16） | Iron nickel powder and Ni powder | -500～+600 | 1：1 | 12% | 32 |
| （17） | Iron silica flour and iron nickel powder | -500～+600 | 1：1 | 12% | 37 |
| （18） | Iron silica flour, iron nickel powder and Ni powder | -500～+600 | 1：1：1 | 12% | 29 |
From upper table contrast, be numbered powder core operating noise minimum in (14) and (15) example, minimumly be down to 25 decibels, compare and reduced more than 60% with the noise of Comparative Examples 1, therefore the mixture that the preferred modifier of the present invention is iron silica flour and Ni powder, further both part by weight are 1:1 ~ 2:1.
Embodiment 2
The preparation method of the Modified Iron silicon boron soft magnetic-powder core that the present embodiment provides comprises the steps,
Step 1, embrittlement is processed: ferrum-silicon-boron amorphous metal sheet band is carried out under 300 ℃ to the heat treatment of 2 hours, its embrittlement is easily pulverized;
Step 2, pulverize: the amorphous metal thin strip of described embrittlement is pulverized to obtain the amorphous metal powder;
Step 3, screening and proportioning: described amorphous metal powder is sieved to the powder particle of the 4th powder constituent that passes through-325 ~+400 sieve meshes that the 3rd powder that passes through-270 ~+325 sieve meshes that the second powder that passes through-200 ~+270 sieve meshes, the weight content that the first powder that passes through-170 ~+200 sieve meshes, the weight content that then to be mixed into by weight content be 15% ~ 20% is 45% ~ 50% is 25% ~ 30% and weight content are 5% ~ 10%; Step 4, Passivation Treatment and insulating wrapped: the amorphous powder particle that proportioning is good is poured in mixer, after being uniformly mixed, add the phosphoric acid liquid that plays passivation effect, addition is 0.10% of amorphous powder granular mass, mixes, and at the uniform velocity stirs until dry; Then add the glass powder with low melting point and the epoxy resin that play the insulation adhesive effect to mix, addition is respectively 2% and 1% of amorphous powder granular mass, at the uniform velocity stirs until dry.
Step 5, add modifier: add modifier in the amorphous powder particle after insulating wrapped, described modifier adopts the mixture of iron silica flour and Ni powder, and part by weight is 1:1, and addition is 12%, and the granularity of described modifier is-500～+ 600 sieve meshes;
Step 6, compressing: the amorphous powder particle after interpolation modifier is pressed into to the annular powder core that specification is external diameter 46.7mm, internal diameter 24.0mm, height 18.0mm, and pressure adopts 20t/cm
2;
Step 7, annealing in process and spraying: the powder core of described moulding is carried out under 440 ℃ to the annealing in process of 3 hours, then adopt epoxy resin to be sprayed insulation processing to the powder core surface.
The present embodiment, by changing the content of four kinds of powder in step 3, obtains 2 examples, is numbered (19) ~ (20).
Comparative Examples 2
The preparation method of the iron silicon boron soft magnetic-powder core that this Comparative Examples provides comprises the steps,
Step 1, embrittlement is processed: ferrum-silicon-boron amorphous metal sheet band is carried out under 300 ℃ to the heat treatment of 2 hours, its embrittlement is easily pulverized;
Step 2, pulverize: the amorphous metal thin strip of described embrittlement is pulverized to obtain the amorphous metal powder;
Step 3, screening and proportioning: described amorphous metal powder is sieved to the powder particle of the powder formation of passing through-270 ~+325 sieve meshes that the powder that pass through-200 ~+270 sieve meshes that then to be mixed into by weight content be 50% and weight content are 50%;
Step 4, Passivation Treatment and insulating wrapped: the amorphous powder particle that proportioning is good is poured in mixer, after being uniformly mixed, add the phosphoric acid liquid that plays passivation effect, addition is 0.10% of amorphous powder granular mass, mixes, and at the uniform velocity stirs until dry; Then add the glass powder with low melting point and the epoxy resin that play the insulation adhesive effect to mix, addition is respectively 2% and 1% of amorphous powder granular mass, at the uniform velocity stirs until dry.
Step 5, add modifier: add modifier in the amorphous powder particle after insulating wrapped, described modifier adopts the mixture of iron silica flour and Ni powder, and part by weight is 1:1, and addition is 12%, and the granularity of described modifier is-500～+ 600 sieve meshes;
Step 6, compressing: the amorphous powder particle after interpolation modifier is pressed into to the annular powder core that specification is external diameter 46.7mm, internal diameter 24.0mm, height 18.0mm, and pressure adopts 20t/cm
2;
Step 7, annealing in process and spraying: the powder core of described moulding is carried out under 440 ℃ to the annealing in process of 3 hours, then adopt epoxy resin to be sprayed insulation processing to the powder core surface.
Comparative Examples 3
After the difference of this Comparative Examples and Comparative Examples 2 is in step 3 described amorphous metal powder is sieved, the powder particle of the 4th powder constituent that passes through-325 ~+400 sieve meshes that the 3rd powder that passes through-270 ~+325 sieve meshes that the second powder that passes through-200 ~+270 sieve meshes, the weight content that the first powder that passes through-170 ~+200 sieve meshes, the weight content that to be mixed into by weight content be 50% is 20% is 15% and weight content are 15%.
Observe the powder core that embodiment 2 and Comparative Examples 2 and 3 obtain, and it is carried out to the test of operating noise test and magnetic property, and test result is recorded in table 3.Magnetic performance testing method is: the enamel-cover copper conductor is wound around to 30 circles, then uses accurate LCR measuring instrument to measure its inductance.Then according to L=(0.4 π μ N
2a * 10
-2)/
lderive magnetic permeability.Wherein N represents the number of turns, and A represents the sectional area of magnetic core,
lrepresent the average length of magnetic circuit.Measuring condition is: alternating voltage is 1V.
Table 3
| Numbering | （14） | （19） | （20） | Comparative Examples 2 | Comparative Examples 3 |
| -170 ~+200 sieve meshes | 15% | 20% | 20% | 0% | 50% |
| -200 ~+270 sieve meshes | 45% | 50% | 45% | 50% | 20% |
| -270 ~+325 sieve meshes | 30% | 25% | 25% | 50% | 15% |
| -325 ~+400 sieve meshes | 10% | 5% | 10% | 0% | 15% |
| High frequency magnetic permeability (100KHz, 1V) | 75 | 74.5 | 74 | —— | —— |
| High frequency magnetic permeability (1MHz, 1V) | 75 | 74 | 73.7 | —— | —— |
| The soft magnetic-powder core surface composition | Surface composition is even | Surface composition is even | Surface composition is even | Surface composition is even | Skin breakage |
| Noise (decibel) | 25 | 32 | 25 | 52 | —— |
Contrast by upper table is known, and the powder core of the embodiment of the present invention is compared and improved the noise defect with Comparative Examples, and have surface composition evenly, magnetic permeability is 75, the more stable good high frequency characteristics with frequency rising magnetic permeability.
In sum, embodiment provided by the invention has following beneficial effect: 1, by adding modifier, greatly improved the noise defect of iron silicon boron magnetic powder core; 2, by powder sieving and proportioning, greatly improved the high frequency characteristics of iron silicon boron magnetic powder core, the soft magnetic-powder core that to have obtained magnetic permeability be 75; 3, modifier is the commercially available prod that can buy, and need not carry out complicated processing procedure, only by adding modifier, just can reach the purpose that reduces noise, and method is simple, easy to operate, and cost is lower; 4, the parameters such as the granularity by further optimizing modifier, addition, kind, greatly reduce the noise of powder core, and high energy reduces more than 60%; 5, by embrittlement, process, make the not oxidized easily pulverizing again of amorphous metal band; 6, by compressing and annealing in process, obtained the alloy soft magnetic powder core of even tissue, high strength, high-compactness and high frequency magnetic permeability; 7, by spraying insulation processing, corrosion resistance and the service time of improving soft magnetic-powder core.
Claims (9)
1. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that a magnetic permeability is 75 is characterized in that: comprises the steps,
Step 1, embrittlement is processed: ferrum-silicon-boron amorphous metal sheet band is heat-treated, its embrittlement is easily pulverized;
Step 2, pulverize: described embrittlement amorphous metal thin strip is pulverized to obtain the amorphous metal powder;
Step 3, screening and proportioning: described amorphous metal powder is sieved to the powder particle of the 4th powder constituent that passes through-325 ~+400 sieve meshes that the 3rd powder that passes through-270 ~+325 sieve meshes that the second powder that passes through-200 ~+270 sieve meshes, the weight content that the first powder that passes through-170 ~+200 sieve meshes, the weight content that then to be mixed into by weight content be 15% ~ 20% is 45% ~ 50% is 25% ~ 30% and weight content are 5% ~ 10%;
Step 4, Passivation Treatment and insulating wrapped: adopt passivator to carry out passivation the powder particle of above-mentioned mixing, then add insulating compound and adhesive to carry out insulating wrapped;
Step 5, add modifier: add modifier in the amorphous powder particle after insulating wrapped, described modifier is selected from the mixture of one or more compositions in Ni powder, iron silica flour and iron nickel powder;
Step 6, compressing: that the amorphous powder particle after interpolation modifier is pressed into to powder core;
Step 7, annealing in process and spraying: the powder core to described moulding carries out annealing in process, then the powder core surface is sprayed to insulation processing.
2. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that magnetic permeability according to claim 1 is 75, it is characterized in that: the granularity of the modifier added in step 5 is-500～+ 600 sieve meshes.
3. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that magnetic permeability according to claim 1 is 75, it is characterized in that: the weight content of the modifier added in step 5 is 5% ~ 20% of amorphous powder particle.
4. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that magnetic permeability according to claim 1 is 75, is characterized in that: the mixture that the modifier added in step 5 is iron silica flour and Ni powder.
5. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that magnetic permeability according to claim 4 is 75, it is characterized in that: the part by weight of iron silica flour and Ni powder is 1:1 ~ 2:1.
6. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that is 75 according to the described any magnetic permeability of claim 1 ~ 5 is characterized in that: in step 1, embrittlement is processed and is carried out under 200 ~ 400 ℃ 1 ~ 3 hour.
7. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that is 75 according to the described any magnetic permeability of claim 1 ~ 5 is characterized in that: in step 4, passivator adopts phosphoric acid liquid, and its addition is 0.05 ~ 0.10% of amorphous powder granular mass; Insulating compound adopts glass powder with low melting point, and addition is 2 ~ 10wt%; Binding agent adopts epoxy resin, and addition is 1 ~ 5wt%.
8. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that is 75 according to the described any magnetic permeability of claim 1 ~ 5 is characterized in that: pressure compressing in step 6 adopts 14 ~ 28t/cm
2.
9. the preparation method of the Modified Iron silicon boron soft magnetic-powder core that is 75 according to the described any magnetic permeability of claim 1 ~ 5, it is characterized in that: in step 7, annealing in process is no more than 6 hours under 380 ~ 480 ℃; It is inorganic agent that the spraying insulation processing adopts epoxy resin.
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| CN111491753A (en) * | 2017-12-19 | 2020-08-04 | 株式会社村田制作所 | Amorphous alloy particles and method for producing amorphous alloy particles |
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