CN100486738C - Manufacturing method of Fe-6.5Si alloy powder and manufacturing method of magnetic powder core - Google Patents
Manufacturing method of Fe-6.5Si alloy powder and manufacturing method of magnetic powder core Download PDFInfo
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- CN100486738C CN100486738C CNB2007100514541A CN200710051454A CN100486738C CN 100486738 C CN100486738 C CN 100486738C CN B2007100514541 A CNB2007100514541 A CN B2007100514541A CN 200710051454 A CN200710051454 A CN 200710051454A CN 100486738 C CN100486738 C CN 100486738C
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Abstract
The making of Fe-6.5Si alloy magnetic powder core comprises grain proportion, alloy powder inactivating, adding insulation agent to the metal powder, binder, lubricant and stripping agent, compression, heat treatment, solidification, surface coating, with the inactivating treatment getting phosphopyruvic acid with 5-15% phosphate chrome, the rest being acetone, adding alloy powder with 2-6% of mass percentage. Adding small quantity Ti nor Ni, it can reach the saturated alloy magnetic sensing strength BS value of 16000- 18000 Gaussian, coercitive force <=80A/m. It has better forming and compression feature. It reduces broken stress. The made magnetic powder core having magnetic conductivity of 125, with low metal core consumption.
Description
Technical field
The invention belongs to the manufacture method of magnetic bodies---particularly Fe-6.5Si alloy powder manufacture method and utilize the manufacture method of the magnetic core of this alloy powder compression molding.This magnetic core mainly is applicable to the iron core of doing PFC inductance and output inductor among Switching Power Supply and the UPS, makes the iron core of differential mode inductance etc. in electromagnetic interface filter.
Background technology
Along with the development of electronics industry, various Switching Power Supplies are widely applied in control system, wherein need to use various magnetic cores.Inexpensive pure iron core is in a large amount of uses, but its magnetic conductivity low (being generally μ e ≈ 75) and core loss are bigger.Nickeliferous permalloy magnetic core though performance is fine, costs an arm and a leg, and use is restricted.Fe-Si-Al magnetic core, moderate cost, magnetic property is suitable, but must be specific composition 9.5%Si, 5.6%Al, and the sial element was difficult to control when it was smelted, and brought a lot of troubles to post-production.According to reported in literature, the magnetostriction coefficient of Fe-6.5Si alloy is gone into
SValue approaches zero, and anisotropy constant K is very little, so magnetic conductivity is very high.The saturation induction density B of this alloy
SBe about 18000 Gausses, resistivity is about 82 microhms. centimetre, almost double than Fe-3%Si (silicon steel sheet), so eddy-current loss is very little, should be good soft magnetic materials, once have the people repeatedly to study, conclusion be impossible adopt common cold-rolling practice processing, must adopt the warm-rolling method, its lumber recovery is low and fail to realize suitability for industrialized production.
Summary of the invention
The objective of the invention is to work out a kind of manufacture method of alloy powder of soft-magnetic powder core and the manufacture method of magnetic core, making its magnetic conductivity is 125, has low core loss, at frequency f=50kHX
Z, B
m=500G
SThe time less than 80mw/cm
3, alternating current-direct current stack performance reaches the Fe-Si-Al magnetic core level.
The manufacture method of a kind of Fe of the present invention-6.5Si alloy powder comprises: the smelting of Fe-6.5Si alloy is cast steel ingot-fragmentation and is made powder---annealing in process, and its feature is as follows:
A alloy component mass percent is: Si6.2-7.0%, and Ti0.3-0.5% or Nb0.4-0.8%, C≤0.02%, O≤0.02%, S, P≤0.035%, remainder are Fe;
The b smelting is to adopt vacuum protection with intermediate frequency furnace;
The raw material that c adopts are ingot iron, polysilicon, titanium sponge or ferro-niobium;
The d annealing in process is that the heat treatment of the alloy powder after the fragmentation is to be incubated 3 in 900-1050 ℃ hydrogen reducing atmosphere---6 hours.
A kind of manufacture method of production Fe-6.5Si alloy magnetic powder core, comprise: grain size proportion---the Passivation Treatment of alloy powder------compression molding---heat treatment---consolidation process---face coat that in alloy powder, adds insulating compound, bonding agent, lubricant and releasing agent, it is characterized in that: the Passivation Treatment of alloy powder is to prepare the phosphoric acid acetone soln earlier, concentration is 5---15% phosphoric acid, surplus for acetone, and addition is the mass percent 2 of alloy powder---6%.
The manufacture method of Fe of the present invention-6.5 Si alloy magnetic powder core, concrete steps are as follows:
A. above-mentioned Fe through annealing in process-6.5 Si alloy powder is sieved, account for 25 ± 5% by-120 orders～+ 200 orders ,-200 orders～+ 300 orders account for 55 ± 5%, and-300 orders account for 20 ± 5% ratio preparation;
B. with alloy powder Passivation Treatment in 5-15% phosphoric acid acetone soln of preparing, the consumption of phosphoric acid acetone soln is 2-6% (mass percent) of alloy powder, Passivation Treatment is to place solution evenly to stir alloy powder, volatilizees fully up to solution, till the powder bone dry.
C. in the alloy powder of Passivation Treatment, add insulating compound (as mica or kaolin, talcum powder) bonding agent (as FK155 or sodium metasilicate), lubricant (as M
0S
2) releasing agent (as stearic acid, zinc stearate, barium stearate, aluminum stearate etc.).
D. compression molding is that its pressure is 18-22t/cm with hydraulic pressure dry powder make-up machine
2
E. the heat treatment of moulding is that 700-800 ℃ of insulations were carried out more than 1 hour in nitrogen or argon shield atmosphere.
F. consolidation process is that the moulding product after the heat treatment were soaked into 20-30 minutes in W-6C of 10-30% or W-6A magnetic bonding agent (with acetone or absolute ethyl alcohol preparation), dries by the fire behind the taking-up airing and copies 1-1.5 hours.Make it arrive the requirement of mechanical strength of using enamel-covered wire coiling inductance.
G. surperficial spray treatment is the epoxy resin that the surface spraying of the moulding product after reinforcing has insulating properties, makes it arrive the dielectric strength requirement of making the coiling inductance.
The manufacture method of Fe of the present invention-6.5 Si alloy powder and the manufacture method of magnetic core have the following advantages:
(1) owing to add a little amount of titanium or niobium in the alloy, makes the saturation induction density B of alloy
SValue can reach 16000-18000 Gausses, coercivity≤80
A/ m.
(2) adopt mechanical crushing method, its particles of powder is shaped as polygon and a small amount of irregular polygon, has formability and compressibility preferably thereby make it make the magnetic core when compression moulding.
(3) annealing in process adopts hydrogen atmosphere to make powder interior carbon, oxygen, nitrogen content further reduce and eliminates Mechanical Crushing stress.
(4) the magnetic core of Zhi Zaoing, its magnetic conductivity is 125, has low core loss, at frequency f=50kH
Z, B
m=500G
SThe time less than 80mw/cm
3, alternating current-direct current stack performance reaches the Fe-Si-Al magnetic core level.
The specific embodiment
Embodiment one:
With ingot iron; silicon metal; titanium sponge (or ferro-niobium) drops into smelting in 50 kilograms of vaccum sensitive stoves of nominal; being cast into chemical composition is; silicon 6.2%; titanium 0.3%; C0.02% is surplus to be the alloy steel ingot of Fe; with hammering method it is broken into material piece below 40 millimeters; the input jaw crusher is ground into the fritter less than 5 millimeters; entering the vibrator ball milling again becomes less than 120 purpose alloy powders; annealing in process was carried out in 900 ℃ of insulations of cabinet-type electric furnace at hydrogen shield in 6 hours; sieve with vibrating sieving machine; account for 30% according to-120 orders～+ 200 orders;-200 orders～+ 300 orders account for 50%;-300 orders account for 20% ratio and carry out grain size proportion; press phosphoric acid 5%+ acetone 95% mass percent wiring solution-forming and press alloy powder 94% again; the mass percent of phosphoric acid acetone soln 6% evenly mixes; mechanical agitation is volatilized fully until acetone, adds 0.4% mica powder (or 0.6% kaolin) after the alloy powder drying; the 0.8%FK155 bonding agent; 0.2%M
0S
2Lubricant evenly mixes with 0.8% zinc stearate after evenly mixing again, promptly becomes the compression molding alloy powder, uses hydraulic pressure dry powder make-up machine, and pressure is 22t/cm
2Be incubated 1.5 hours for 700 ℃ at the nitrogen protection heat-treatment furnace after the compression moulding; come out of the stove and cool off fast; the acetone soln (being that 30%W-6C magnetic bonding agent+70% acetone is joined solution) of preparation 30%W-6C; moulding product after the heat treatment are put into this solution impregnation take out airing after 30 minutes; promptly finish consolidation process through 150 ℃ of oven dry in 1 hour again, be coated with thickness with the black epoxy painted surface at last and be formal product for 0.3 millimeter.Its magnetic parameter table 1:
Compacting size: external diameter ￠ 26.90, internal diameter ￠ 14.70, height 11.10mm coiling inductance coil enamel-covered wire, diameter is a ￠ 0.5mm.26 circle.
Inductance factor 157nH/N
2Corresponding magnetic conductivity μ e=125
Embodiment two:
Technological process is with example one, smelts composition Si6.98%, Ti0.5%, C0.012%, surplus be Fe.Be broken into behind the alloy powder 1050 ℃ of temperature, hydrogen reducing annealing in process insulation 3 hours accounts for 20% by-120 orders～+ 200 orders, and-200 orders～+ 300 orders account for 60%, and-300 orders account for 20% and carry out grain size proportion.By 15% phosphoric acid acetone (promptly 15% phosphoric acid+85% acetone is made into) wiring solution-forming, the above-mentioned phosphoric acid acetone soln of pressing alloy powder 98%, 2% mixes, and does not stop to stir, add insulating compound 0.4% kaolin, 0.6%FK155 bonding agent, 0.2%M again until the acetone alloy powder drying of volatilizing fully
0S
2After lubricant evenly mixes, use 0.8% barium stearate (releasing agent) evenly to mix again, magazine on the 100t hydraulic pressure dry powder automatic moulding machine of can packing into is pressed 21t/cm
2Pressure is pressed; compacting size: external diameter ￠ 26.90; internal diameter ￠ 14.7; height 11.10mm; compression moulding product 750 ℃ of insulations under argon shield cooling of coming out of the stove after 1 hour; reinforce with surperficial spraying and can test by example one again, use ￠ 0.5mm enamel-covered wire around 26 circles, its magnetic parameter such as table 2:
Embodiment three:
Technological process is with real embodiment one, and the smelting chemical composition sees the following form, and alloy powder annealing in process temperature is that 4 hours phosphoric acid acetone concentration of 950 ℃ of insulations are 10%, and addition is 4% (mass percent) of alloy powder.Its chemical composition change and magnetic property such as table 3:
Claims (2)
1, the manufacture method of a kind of Fe-6.5 Si alloy powder comprises: the smelting of Fe-6.5 Si alloy is cast steel ingot-fragmentation and is made powder---and annealing in process is characterized in that:
A alloy component mass percent is: Si 6.2-7.0%, and Ti 0.3-0.5% or Nb 0.4-0.8%, C≤0.02%, O≤0.02%, S, P≤0.035%, remainder are Fe;
It is to adopt vacuum protection with intermediate frequency furnace that b smelts;
The raw material that c adopts are ingot iron, polysilicon, titanium sponge or ferro-niobium;
The d annealing in process is the heat treatment of the alloy powder after the fragmentation, is incubated 3 in 900-1050 ℃ hydrogen reducing atmosphere---6 hours.
2, the manufacture method of a kind of Fe-6.5Si alloy magnetic powder core, comprise: grain size proportion---the Passivation Treatment of alloy powder------compression molding---heat treatment---consolidation process---face coat that in alloy powder, adds insulating compound, bonding agent, lubricant and releasing agent, it is characterized in that: the Passivation Treatment of alloy powder is to prepare the phosphoric acid acetone soln earlier, concentration is 5---15% phosphoric acid, surplus for acetone, and addition is the mass percent 2 of alloy powder---6%.
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