CN104291804A - Method for preparing wide-temperature magnesium-copper-zinc soft magnetic ferrite core - Google Patents
Method for preparing wide-temperature magnesium-copper-zinc soft magnetic ferrite core Download PDFInfo
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Abstract
The invention discloses a wide-temperature magnesium-copper-zinc soft magnetic ferrite core and a preparation method thereof. The wide-temperature magnesium-copper-zinc soft magnetic ferrite core is characterized by comprising a main component and an auxiliary component, wherein the main component comprises 68-69 percent of Fe2O3, 18.5-19.0 percent of ZnO, 3.0-4.0 percent of MgO and 9.0-10.0 percent of CuO; the auxiliary component Bi2O3 accounts for 0.2 percent by weight of the main component according to the reference substance. The preparation method comprises the following steps of: 1), performing mixed oscillation grinding and pre-burning on the main components and obtaining a pre-burning material A and a pre-burning material B according to different pre-burning temperature; 2), totally adding the auxiliary component Bi2O3 into the pre-burning material A and the pre-burning material B, and adding adhesives into the pre-burning materials together for sanding and performing spray-granulation; 3) adding zinc stearic acid into a pelleting material, mixing uniformly, and pressing blank pieces for sintering to obtain the wide-temperature magnesium-copper-zinc soft magnetic ferrite core. The wide-temperature magnesium-copper-zinc soft magnetic ferrite core is high in initial magnetoconductivity and impedance characteristic, and is mainly used for manufacturing electromagnetic interference resistant magnetic cores.
Description
Technical field
That the present invention relates to is a kind of preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core, belongs to soft magnetic ferrite technical field.
Background technology
Soft magnetic ferrite belongs to ferrimagnetic material, is widely used in the electronicss such as transformation, filtering, electromagnetic compatibility as a base components.Along with the compulsory execution that country requires electronic and electrical equipment EMC, EMI electronic devices and components based on magnetic ferrite magnetic core are simple and practical with it, impedance frequency characteristic is good, cost performance high is used in various electronics, as power tool, household electrical appliances, instrument, electric power, communication etc. by a large amount of.Electromagnetic interference is divided into conducted interference and radiation interference, and wherein the frequency of radiation interference generation is higher, and generally from a few megahertz to hundreds of megahertz, nickel-zinc ferrite, owing to having excellent high-frequency resistance characteristic, is widely used.But sharp rising in recent years along with international metallic nickel market, also when the river rises the boat goes up for the price of nickel protoxide, be that the cost of the Ni-Zn soft magnetic ferrite of main raw material(s) is also multiplied thereupon with nickel protoxide, in the face of the cost pressure day by day increased, got up by pay attention to day by day with Mg-Zn material replacement nickel Zinc material, and the most initial magnetic permeability of existing Mg-Zn material is on the low side, generally be no more than 800, and its impedance characteristic, particularly be nothing like existing nickel Zinc material in this region of 10MHz ~ 25MHz, replacement nickel Zn ferrite has significant limitation.
Summary of the invention
That the present invention proposes is a kind of preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core, its object is intended to the above-mentioned defect overcome existing for prior art, this magnetic core can have higher initial magnetic permeability, has good impedance characteristic in this region of 10MHz ~ 25MHz.
Technical solution of the present invention: wide temperature magnesium copper Zn soft magnetic ferrite magnetic core, its structure comprises principal constituent and minor component, and described principal constituent forms Fe by the raw material of following weight percent
2o
368 ~ 69.5%; ZnO 18.5 ~ 19.0%; MgO 3.0 ~ 4.0%; CuO 9.0 ~ 10.0%; Described minor component accounts for the weight percent of principal constituent for Bi with its standard substance
2o
3: 0.2wt%.
The preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core, comprises the steps:
1) principal constituent is carried out mixing vibration, pre-burning, obtain A Preburning material and B Preburning material by different calcined temperatures;
2) by minor component Bi
2o
3all be added in A, B Preburning material (A:B=10:1 ~ 1.5), add caking agent sand milling together, sand milling granularity 1.0 ± 0.2 μm, then mist projection granulating; 40 ~ 200 eye mesh screens crossed by powder;
3) zinc stearate of 0.2 ~ 0.3wt% will be added in particulate material, mix rear pressed blanks and sinter, obtain wide temperature magnesium copper Zn soft magnetic ferrite magnetic core; Wherein blank density 3.0 ~ 3.1g/cm
3, sintering temperature 1050 ~ 1100 DEG C, soaking time 1.5 ~ 2 hours.
Advantage of the present invention:
1) this powder cost is low, is 1/2 of same permeability nickel-zinc ferrite;
2) although this powder impedance is a little less than nickel zinc, in interval much higher than existing magnesium zinc of 1M ~ 25MHz;
3) or perhaps in view of the very high Mg-Zn material of a kind of impedance cost performance between current existing nickel zinc and magnesium zinc.
Accompanying drawing explanation
Accompanying drawing 1 is process flow sheet of the present invention.
Accompanying drawing 2 is impedance characteristic schematic diagram.
Embodiment
Wide temperature magnesium copper Zn soft magnetic ferrite magnetic core, its structure comprises principal constituent and minor component, and described principal constituent forms Fe by the raw material of following weight percent
2o
368 ~ 69.5%; ZnO 18.5 ~ 19.0%; MgO 3.0 ~ 4.0%; CuO 9.0 ~ 10.0%; Described minor component accounts for the weight percent of principal constituent for Bi with its standard substance
2o
3: 0.2wt%.
Contrast Fig. 1, the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core, comprises the steps:
1) principal constituent is carried out mixing vibration, pre-burning, obtain A Preburning material and B Preburning material by different calcined temperatures;
2) by minor component Bi
2o
3all be added in A, B Preburning material (A:B=10:1 ~ 1.5), add caking agent sand milling together, sand milling granularity 1.0 ± 0.2 μm, then mist projection granulating; 40 ~ 200 eye mesh screens crossed by powder;
3) zinc stearate of 0.2 ~ 0.3wt% will be added in particulate material, mix rear pressed blanks and sinter, obtain wide temperature magnesium copper Zn soft magnetic ferrite magnetic core; Wherein blank density 3.0 ~ 3.1g/cm
3, sintering temperature 1050 ~ 1100 DEG C, soaking time 1.5 ~ 2 hours.
In granulation material, add lubricant, pressed blanks sinters, and obtains wide temperature magnesium copper Zn soft magnetic ferrite magnetic core.
Described carries out mixing vibration by principal constituent, carries out mixing vibration 30 ~ 60 minutes with intermittent type vibrating ball mill.
Described pre-burning, carries out pre-burning with 1050 ± 20 DEG C, rotary kiln, obtains A Preburning material; Carry out pre-burning with pushed bat kiln 1150 ± 20 DEG C, soaking time is 1 ~ 2 hour, obtains B Preburning material, wherein A Preburning material: the weight percent of B Preburning material is 10:1 ~ 1.5.
Caking agent during described sand milling is PVA solution, and concentration 10 ~ 11wt%, addition is 10 ~ 12wt%.
Described lubricant is Zinic stearas, and addition is 0.2 ~ 0.3wt%.
Its average sand milling granularity of described sand milling is 1.0 ± 0.2 μm.
Described pressed blanks carries out sintering condition: normal temperature is warmed up to 1050 DEG C in 8 ~ 10 hours, insulation 2 ~ 3
Hour, then with stove Temperature fall to 100 ~ 120 DEG C time, the room temperature of blow-on door naturally cooling.
The Fe that keeps under strict control is needed in formula
2o
3content, too high levels can cause this ferritic surface resistivity to decline, and this ferritic initial magnetic permeability that content is on the low side is not come and Curie temperature can reduce.Adding of CuO effectively can improve this ferritic impedance characteristic, especially at 10 ~ 25MHz.
Above-mentioned minor component Bi
2o
3the effect mainly played crystal grain thinning in the invention, suppress grain growing excessive.
Control grain growing speed further with High Temperature Pre imitation frosted glass B, prevent crystal grain transition from growing up.
The starting material adopted and equipment etc. all can be buied from market or this area is conventional.
Embodiment
(1) prepare burden: weigh each following each main composition by recipe requirements electronic scales; Its screening formulation is as follows:
Fe
2O
3：68.55wt%；
ZnO：18.56wt%；
MgO：3.56wt%；
CuO：9.33wt%。
(2) vibration: by the powder prepared, is added in intermittent type vibrating ball mill, and vibration 30 minutes, mixes.
(3) pre-burning: pre-burning about 30 ~ 40 minutes at 1050 DEG C, rotary kiln, obtains Preburning material A;
At pushed bat kiln 1150 DEG C, pre-burning 90 ~ 120 minutes, obtains Preburning material B.
(4) sand milling: add water in sand mill according to the ratio admittedly containing 60 ~ 62wt%, PVA solution is added in the ratio of 10 ~ 12wt%, add appropriate dispersion agent and defoamer, start sand mill and enter circulation sand milling state, then A and B Preburning material is poured in sand mill according to the ratio of 10:1, add 0.2%Bi simultaneously
2o
3, circulate sand milling in sand mill, when sand milling granularity reaches 1.0 ± 0.2 μm, stops sand milling.
(5) mist projection granulating: above-mentioned slip is sent into spray tower and carries out mist projection granulating, the particle made is crossed 40 ~ 200 eye mesh screens and obtained finished product material.
(6) compression moulding: the zinc stearate above-mentioned finished product material being mixed into 0.2 ~ 0.3wt%, puts into mould inner pressure and makes
Type, green density 3.0 ~ 3.1g/cm
3.
(7) sinter: be placed in high temperature sintering furnace by above-mentioned blank and sinter, normal temperature is warmed up to 1080 DEG C in 8 ~ 10 hours, is incubated 2 hours, then with stove Temperature fall to 100 ~ 120 DEG C time, the room temperature of blow-on door naturally cooling.
According to the wide temperature magnesium copper Zn soft magnetic ferrite magnetic core that above-mentioned example is obtained, its performance is as follows:
Compare with the ambrose alloy Zn soft magnetic ferrite magnetic core of my company existing equal initial magnetic permeability (ui=1000 ± 25%) according to the wide temperature magnesium copper Zn soft magnetic ferrite magnetic core of above-mentioned example, reach more than 85% of nickel zinc impedance level at 10MHz ~ 25MHz, its impedance characteristic as shown in Figure 2.
The actual verification of above data and client shows, this material can substitute most nickel Zinc material and manufacture anti-interference magnetic core, thus significantly reduces material cost.
Claims (9)
1. wide temperature magnesium copper Zn soft magnetic ferrite magnetic core, it is characterized in that comprising principal constituent and minor component, described principal constituent forms Fe by the raw material of following weight percent
2o
368 ~ 69.5%; ZnO 18.5 ~ 19.0%; MgO 3.0 ~ 4.0%; CuO 9.0 ~ 10.0%; Described minor component accounts for the weight percent of principal constituent for Bi with its standard substance
2o
3: 0.2wt%.
2. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core as claimed in claim 1, is characterized in that: comprise the steps:
1) principal constituent is carried out mixing vibration, pre-burning, obtain A Preburning material and B Preburning material by different calcined temperatures;
2) by minor component Bi
2o
3all be added in A, B Preburning material of A:B=10:1 ~ 1.5, add caking agent sand milling together, sand milling granularity 1.0 ± 0.2 μm, then mist projection granulating; 40 ~ 200 eye mesh screens crossed by powder;
3) zinc stearate of 0.2 ~ 0.3wt% will be added in particulate material, mix rear pressed blanks and sinter, obtain wide temperature magnesium copper Zn soft magnetic ferrite magnetic core; Wherein blank density 3.0 ~ 3.1g/cm
3, sintering temperature 1050 ~ 1100 DEG C, soaking time 1.5 ~ 2 hours.
3. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core according to claim 2, it is characterized in that described adding lubricant by granulation material, pressed blanks sinters, and obtains magnetic ferrite magnetic core.
4. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core according to claim 2, is characterized in that described principal constituent being carried out mixing vibration, carries out mixing vibration 30 ~ 60 minutes with intermittent type vibrating ball mill.
5. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core according to claim 2, is characterized in that described pre-burning, carries out pre-burning, obtain A Preburning material with 1050 ± 20 DEG C, rotary kiln; Carry out pre-burning with pushed bat kiln 1150 ± 20 DEG C, soaking time is 1 ~ 2 hour, obtains B Preburning material, wherein A Preburning material: the weight percent of B Preburning material is 10:1 ~ 1.5.
6. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core according to claim 2, caking agent when it is characterized in that described sand milling is PVA solution, concentration 10 ~ 11wt%, and addition is 10 ~ 12wt%.
7. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core according to claim 2, it is characterized in that described lubricant is Zinic stearas, addition is 0.2 ~ 0.3wt%.
8. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core according to claim 2, is characterized in that its average sand milling granularity of described sand milling is 1.0 ± 0.2 μm.
9. the preparation method of wide temperature magnesium copper Zn soft magnetic ferrite magnetic core according to claim 2, it is characterized in that described pressed blanks carries out sintering condition and is: normal temperature is warmed up to 1050 DEG C in 8 ~ 10 hours, be incubated 2 ~ 3 hours, then with stove Temperature fall to 100 ~ 120 DEG C time, the room temperature of blow-on door naturally cooling.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891975A (en) * | 2015-04-24 | 2015-09-09 | 马鞍山科信咨询有限公司 | High flexural strength nickel-zinc soft magnetic ferrite material and preparation method thereof |
| CN104891979A (en) * | 2015-04-24 | 2015-09-09 | 马鞍山科信咨询有限公司 | Wide temperature magnesium copper zinc soft magnetic ferrite magnetic core and preparation method thereof |
| CN104891982A (en) * | 2015-04-24 | 2015-09-09 | 马鞍山科信咨询有限公司 | Rare earth high-magnetic-permeability soft magnetic ferrite and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013622A (en) * | 2005-12-19 | 2007-08-08 | Tdk株式会社 | Ferrite magnetic material |
| CN102531560A (en) * | 2011-12-30 | 2012-07-04 | 南通鼎源电子磁材有限公司 | Magnetism, copper and zinc-iron soft magnetic ferrite material and preparation method thereof |
| CN102557606A (en) * | 2012-03-16 | 2012-07-11 | 南京深宁磁电有限公司 | Preparation method for magnesium-zinc soft ferrite material and magnesium-zinc soft ferrite material |
-
2014
- 2014-09-30 CN CN201410516709.7A patent/CN104291804B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013622A (en) * | 2005-12-19 | 2007-08-08 | Tdk株式会社 | Ferrite magnetic material |
| CN102531560A (en) * | 2011-12-30 | 2012-07-04 | 南通鼎源电子磁材有限公司 | Magnetism, copper and zinc-iron soft magnetic ferrite material and preparation method thereof |
| CN102557606A (en) * | 2012-03-16 | 2012-07-11 | 南京深宁磁电有限公司 | Preparation method for magnesium-zinc soft ferrite material and magnesium-zinc soft ferrite material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891975A (en) * | 2015-04-24 | 2015-09-09 | 马鞍山科信咨询有限公司 | High flexural strength nickel-zinc soft magnetic ferrite material and preparation method thereof |
| CN104891979A (en) * | 2015-04-24 | 2015-09-09 | 马鞍山科信咨询有限公司 | Wide temperature magnesium copper zinc soft magnetic ferrite magnetic core and preparation method thereof |
| CN104891982A (en) * | 2015-04-24 | 2015-09-09 | 马鞍山科信咨询有限公司 | Rare earth high-magnetic-permeability soft magnetic ferrite and preparation method thereof |
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