CN1686929A - Lowloss ferritc in manganese zinc series and preparation method thereof - Google Patents
Lowloss ferritc in manganese zinc series and preparation method thereof Download PDFInfo
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- CN1686929A CN1686929A CN 200510033612 CN200510033612A CN1686929A CN 1686929 A CN1686929 A CN 1686929A CN 200510033612 CN200510033612 CN 200510033612 CN 200510033612 A CN200510033612 A CN 200510033612A CN 1686929 A CN1686929 A CN 1686929A
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Abstract
The present invention relates to a low-loss manganese zinc series ferrite and its preparation method. Said ferrite includes main component formed from 50mol%-55mol% of Fe2O3, 31mol%-38mol% of MnO and 8 mol%-15 mol% of ZnO and auxiliary component formed from CaO, K2O and TiO2 whose total content is 0.01-0.65 wt%.
Description
Technical field
The present invention relates to a kind of Mn-Zn based ferrite, relate in particular to lower ferrite in manganese zinc series of a kind of power loss and preparation method thereof.
Background technology
Soft magnetic ferrite is the soft magnetic materials that uses in the supply transformer relatively early, and along with the switch power supply operating frequency is more and more higher, corresponding material one pickup monobasic develops.Early seventies for adapting to the needs in switch power supply market, is developed first-generation power ferrite material, as the H35 of TDK.This material only is applicable to the domestic switch power supply of operating frequency about 20kHz because its power consumption is big.Early eighties, s-generation power ferrite material comes out, and as the H7C1 (PC30) of TDK, this material has the negative temperature coefficient power consumption, and along with temperature raises, power consumption is on a declining curve, and the operating frequency that is suitable for is about 100kHz.The late nineteen eighties, for adapting to the development of high frequency switch power, develop third generation power ferrite material, PC40 material as TDK, its operating frequency is about 250kHz, it is hundreds of kilo hertzs switch power supply that this class material is specially adapted to operating frequency, is widely used in now in the switch power supply of industrial class.TDK correspondingly releases the PC44 high-frequency and low-consumption material that is used for switch power supply in mid-term the early 1990s, it has, the applying frequency higher (characteristic of 200KHz～500KHz) lower than PC40 material power consumption.
The domestic a fairly large number of soft magnetic ferrite manufacturer that has at present, some representational producers such as sky are logical, 898 factories and 899 factories etc. more stably produce product near or reach PC40 class Ferrite Material standard.
Similarly, the patent No. being arranged is that 03115906.0 Chinese patent application file discloses a kind of manganese-zinc power soft ferrite material powder and preparation method thereof, Fe in the soft magnetic ferrite material powder
2O
3Be 58-79wt%, Mn
3O
4: 15-30wt%, ZnO:5-15wt%, auxiliary material (comprises SiO
2, CaCO
3, V
2O
5, Nb
2O
5): 0-7wt%, total amount satisfies 100%.Major ingredient and auxiliary material are made manganese-zinc power soft ferrite material powder by mixing, pre-burning, coarse reduction, sand milling, five operations of mist projection granulating, it is said that its finish mix powder power consumption is lower, saturation induction density Bs height, and superior performance, with low cost.
The patent No. that also has similarly is that 02150733.3 Chinese patent application file also discloses a kind of high frequency close grain soft magnetic ferrimagnetics material and production technique thereof, it is that main raw material is made by ferric oxide, zinc oxide and manganese oxide, the average grain size that it is characterized in that described soft magnetic ferrite is 3-5 μ m, and each component in the weight percentage ranges of oxide compound is: Fe
2O
3: 50-57%; ZnO:0-13%; MnO:30-50%; All the other are doping composition M; Its processing step that adopts is: batching, ball milling, vibration, pre-burning, sand milling, granulation, moulding, sintering, mill processing and packing, it is said: its technology is fit to industrialized mass production, the characteristics that production cost is low, process stabilizing, product have the magnetic permeability height, power loss is little, reach the technical indicator of high-frequency low-consumption power Ferrite Material PC50, thereby provide advantageous conditions for miniaturization, the chip type of realizing electron device.
Similarly, also having publication number is the Mn-Zn ferrite that the Japanese patent application file of JP2002179461 also discloses a kind of high magnetic permeability, low-loss and high reliability, it takes to comprise the auxiliary material of tantalum pentoxide, hafnium oxide, and proportioning and content are different, will not give unnecessary details.
Summary of the invention
At the above-mentioned condition of prior art, the technical purpose that the present invention will reach is that a kind of lowloss ferritc in manganese zinc series and manufacture method thereof that negative temperature coefficient is the higher magnetic core of the power consumption operating frequency on a declining curve and suitable along with the temperature rising that have will be provided.
For this reason, technical solution of the present invention is a kind of lowloss ferritc in manganese zinc series, this ferrite comprises principal constituent ferric oxide, zinc oxide and manganese oxide and ancillary component, described principal constituent and ancillary component sintering form face-centered cubic spinel crystalline form, and described principal constituent is as follows in the content of standard substance separately, Fe
2O
3: 50mol%～55mol%, MnO:31mol%～38mol%, ZnO:8mol%～15mol%, described ancillary component comprises calcium oxide, potassium oxide and titanium oxide, described relatively principal constituent total amount, described calcium oxide, potassium oxide and titanium oxide are with its standard substance CaO, K
2O and TiO
2The total content of meter is 0.01～0.65wt%.Manganese of the present invention-zinc power ferrite material powder has the technical indicator that good processability and sintered products can reach expection.Material powder physicals is as follows:
The particulate water content is 0.2～0.6wt%,
The pine dress is than being: 1.25～1.45g/cm
3,
Angle of repose is≤30 °.
In order to strengthen above-mentioned advantage of the present invention, as the good embodiment of practicality of the present invention, described relatively principal constituent total amount, described ancillary component is respectively CaO:0.002～0.1wt%, K in the content of standard substance separately
2O:0.003～0.4wt%, TiO
2: 0.005～0.15wt%.
Described ancillary component further comprises Si oxide, barium oxide, niobium oxide, cobalt/cobalt oxide, tin-oxide, tantalum pentoxide, Zirconium oxide, described relatively principal constituent total amount, and these ancillary components are with its standard substance SiO
2, V
2O
5, Nb
2O
5, Co
2O
3, SnO, Ta
2O
5, ZrO
2The total content of meter is 0～0.66wt%.
Described relatively principal constituent total amount, Si oxide, barium oxide, niobium oxide, cobalt/cobalt oxide, tin-oxide, tantalum pentoxide, Zirconium oxide are separately with its standard substance SiO in the described ancillary component
2, V
2O
5, Nb
2O
5, Co
2O
3, SnO, Ta
2O
5, ZrO
2The content of meter is respectively SiO
2: 0～0.01wt%, V
2O
5: 0～0.15wt%, Nb
2O
5: 0～0.1wt%, Co
2O
3: 0～0.1wt%, SnO:0～0.1wt%, Ta
2O
5: 0～0.1wt%, ZrO
2: 0～0.1wt%.
Correspondingly, be a kind of manufacture method of aforesaid lowloss ferritc in manganese zinc series for reaching another technical solution of technical purpose of the present invention, this method comprises the steps: A) with principal constituent Fe
2O
3, Mn
3O
4, the ZnO pellet mixes through a sand milling, making median size is the main powder that divides of 1.0 ± 0.3 μ m; B) with described main divide powder drying, pre-burning, add pure water, dispersion agent and ancillary component again, carry out the secondary sand milling together, adding tackiness agent and defoamer make the mixed powder that median size is 1.0 ± 0.2 μ m in the secondary sand grinding process; C) with mixed powder drying, compression moulding, under 1300～1400 ℃ of following inflated with nitrogen atmosphere, be incubated 4～6 hours sintering, cooling makes described ferrite finished product under balanced atmosphere.Method of the present invention and production cost are lower, be applicable to common big industrial production, utilize the power consumption of the magnetic core that the present invention makes to raise and on a declining curve along with temperature, and (200～300KHz) have low power loss, also have higher initial permeability at normal temperatures under medium-high frequency.
As the preferred embodiment of the inventive method, among the described step B, described defoamer comprises n-Octanol, and described tackiness agent comprises polyvinyl alcohol.
Among the described step B, described relatively principal constituent total amount, the adding proportion of described pure water are 35～38wt%, and the adding proportion of described dispersion agent is 0～0.5wt%, the adding proportion of described tackiness agent is 0.4～1.0wt%, and the adding proportion of described defoamer is 0～0.5wt%.
In the described steps A, described calcined temperature is controlled at 900 ℃ ± 30 ℃ scopes, and in the pre-burning process, the described main magnetization degree of powder that divides is controlled in 0～25 scope.
Among described step B, the C, described drying process is to adopt spray method; Among the described step C, the density of the mixed powder after the described compression moulding is 3.0 ± 0.2g/cm
3
The invention will be further described below in conjunction with specific embodiment.
Embodiment
Embodiment 1
Take by weighing 53.2mol%Fe
2O
3, (the raw material form is Mn to 35.0mol%MnO
3O
4), 11.8mol%ZnO, wherein iron oxide red adopts homemade Baosteel iron oxide red (Fe
2O
3% 〉=99.2%), Mn
3O
4Adopt gold auspicious common (Mn% 〉=71%), ZnO producer is capital, Shanghai (ZnO% 〉=99.7%).Drop in the sand mill and stir, the control median size is 1.0 ± 0.3 μ m, and once spraying back electricity consumption heating revolving kiln under 900 ± 30 ℃ of temperature carries out pre-burning, and the control magnetization degree is 0～25.Pre-subsequently imitation frosted glass drops into sand mill and carries out the secondary sand milling, and described relatively principal constituent total amount in the sand grinding process adds pure water 36%, dispersion agent 0.01% and defoamer 0.008%, and adds addition of C aCO
30.05wt%, SiO
20.005wt%, Nb
2O
50.05wt%, K
2CO
30.04wt%, Co
2O
30.03wt% and TiO
20.10wt%, the median size of control sand milling is 1.0 ± 0.2 μ m.Carry out the secondary spraying at last and obtain Mn-Zn ferrite particle material powder.
Get the toroidal core of this particulate material moulding compacting φ 25mm * φ 15mm * 7.5mm, compact density is 3.0 ± 0.2g/cm
3, at 1300～1400 ℃ of following N
2Carry out sintering under the protection, be incubated 4～6 hours, under balanced atmosphere, cool off.
Grinding the BHS-4 tester with the U.S.'s 2330 power consumption instrument, CH100 tester, Japan's reason, to record the correlated performance of sintered compact as shown in table 1.
Embodiment 2
Take by weighing 52.9mol%Fe
2O
3, (the raw material form is Mn to 32.9mol%MnO
3O
4), 14.2mol%ZnO, drop in the sand mill and stir, the control median size is 1.0 ± 0.3 μ m, once spraying back electricity consumption heating revolving kiln under 900 ± 30 ℃ of temperature carries out pre-burning, the control magnetization degree is 0～25.Pre-subsequently imitation frosted glass drops into sand mill and carries out the secondary sand milling, and described relatively principal constituent total amount in the process adds pure water 36wt%, dispersion agent 0.01wt% and defoamer 0.008wt%, and adds additive SiO
20.002wt%, CaCO
30.03wt%, V
2O
50.06wt%, K
2CO
30.4wt%, Nb
2O
50.05wt%, ZrO
20.05wt% and Ta
2O
50.03wt%, the median size of control secondary sand milling is 1.0 ± 0.2 μ m.Carry out the secondary spraying at last and obtain Mn-Zn ferrite particle material powder.
Get the toroidal core of this particulate material moulding compacting φ 25mm * φ 15mm * 7.5mm, compact density is 3.0 ± 0.2g/cm
3, at 1300～1400 ℃ of following N
2Carry out sintering under the protection, be incubated 4～6 hours, under balanced atmosphere, cool off.
Grinding the BHS-4 tester with the U.S.'s 2330 power consumption instrument, CH100 tester, Japan's reason, to record the correlated performance of sintered compact as shown in table 1 below.
Table 1
| Lot number | Initial permeability | Saturation magnetic flux density (H=1194A/m) | ??????Pcv(mw/cm 3)(100KHz，200mT) | ||
| ??25℃ | ??80℃ | ??100℃ | |||
| ??TDK?PC40 | ??2300 | ??510 | ??600 | ??/ | ??410 |
| Embodiment 1 | ??2345 | ??513 | ??546 | ??365 | ??351 |
| Embodiment 2 | ??2384 | ??508 | ??565 | ??371 | ??356 |
As shown in table 1, product of the present invention has low-power consumption, and suitable operating frequency is higher.
Claims (9)
1, a kind of lowloss ferritc in manganese zinc series, this ferrite comprises principal constituent ferric oxide, zinc oxide and manganese oxide and ancillary component, it is characterized in that: described principal constituent is as follows in the content of standard substance separately, Fe
2O
3: 50mol%～55mol%, MnO:31mol%～38mol%, ZnO:8mol%～15mol%, described ancillary component comprises calcium oxide, potassium oxide and titanium oxide, described relatively principal constituent total amount, described calcium oxide, potassium oxide and titanium oxide are with its standard substance CaO, K
2O and TiO
2The total content of meter is 0.01～0.65wt%.
2, lowloss ferritc in manganese zinc series as claimed in claim 1 is characterized in that: described relatively principal constituent total amount, described ancillary component is respectively CaO:0.002～0.1wt%, K in the content of standard substance separately
2O:0.003～0.4wt%, TiO
2: 0.005～0.15wt%.
3, lowloss ferritc in manganese zinc series as claimed in claim 1 or 2, it is characterized in that: described ancillary component further comprise Si oxide, barium oxide, niobium oxide, cobalt/cobalt oxide, tin-oxide, tantalum pentoxide, Zirconium oxide wherein one or more, described relatively principal constituent total amount, these ancillary components are with its standard substance SiO
2, V
2O
5, Nb
2O
5, Co
2O
3, SnO, Ta
2O
5, ZrO
2The total content of meter is 0～0.66wt%.
4, lowloss ferritc in manganese zinc series as claimed in claim 3, it is characterized in that: described relatively principal constituent total amount, Si oxide, barium oxide, niobium oxide, cobalt/cobalt oxide, tin-oxide, tantalum pentoxide, Zirconium oxide are separately with its standard substance SiO in the described ancillary component
2, V
2O
5, Nb
2O
5, Co
2O
3, SnO, Ta
2O
5, ZrO
2The content of meter is respectively SiO
2: 0～0.01wt%, V
2O
5: 0～0.15wt%, Nb
2O
5: 0～0.1wt%, Co
2O
3: 0～0.1wt%, SnO:0～0.1wt%, Ta
2O
5: 0～0.1wt%, ZrO
2: 0～0.1wt%.
5, as the preparation method of the described lowloss ferritc in manganese zinc series of one of claim 1～4, described method comprises the steps: A) with principal constituent Fe
2O
3, Mn
3O
4, the ZnO pellet mixes through a sand milling, making median size is the main powder that divides of 1.0 ± 0.3 μ m; B) with described main divide powder drying, pre-burning, add pure water, dispersion agent and ancillary component again, carry out the secondary sand milling together, adding tackiness agent and defoamer make the mixed powder that median size is 1.0 ± 0.2 μ m in the secondary sand grinding process; C) with mixed powder drying, compression moulding, under 1300～1400 ℃ of following inflated with nitrogen atmosphere, be incubated 4～6 hours sintering, cooling makes described ferrite finished product under balanced atmosphere.
6, the preparation method of lowloss ferritc in manganese zinc series as claimed in claim 5 is characterized in that: among the described step B, described defoamer comprises n-Octanol, and described tackiness agent comprises polyvinyl alcohol.
7, the manufacture method of lowloss ferritc in manganese zinc series as claimed in claim 5, it is characterized in that: among the described step B, described relatively principal constituent total amount, the adding proportion of described pure water is 35～38wt%, the adding proportion of described dispersion agent is 0～0.5wt%, the adding proportion of described tackiness agent is 0.4～1.0wt%, and the adding proportion of described defoamer is 0～0.5wt%.
8, the manufacture method of lowloss ferritc in manganese zinc series as claimed in claim 5 is characterized in that: among the described step B, described calcined temperature is controlled at 900 ℃ ± 30 ℃ scopes, and in the pre-burning process, the described main magnetization degree of powder that divides is controlled in 0～25 scope.
9, the manufacture method of lowloss ferritc in manganese zinc series as claimed in claim 5 is characterized in that: among described step B, the C, described drying process is to adopt the mist projection granulating method; Among the described step C, the density of the green compact after the described compression moulding is 3.0 ± 0.2g/cm
3
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| CN100344571C CN100344571C (en) | 2007-10-24 |
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| CN1023583C (en) * | 1990-07-14 | 1994-01-19 | 机械电子工业部第三十三研究所 | low-loss oxide magnetic material and manufacturing method thereof |
| KR960012995B1 (en) * | 1993-03-31 | 1996-09-25 | 엘지전자 주식회사 | Single crystal ferrite |
| TW364125B (en) * | 1997-03-13 | 1999-07-11 | Tdk Corp | Mn-Zn ferric salt |
| JPH10338600A (en) * | 1997-06-06 | 1998-12-22 | Hitachi Metals Ltd | Manganese-zinc single crystal ferrite material and high frequency magnetic head |
| JP2001064076A (en) * | 1999-08-26 | 2001-03-13 | Tdk Corp | Magnetic ferrite material and its production |
| JP2001068326A (en) * | 1999-08-30 | 2001-03-16 | Tdk Corp | MnZn BASED FERRITE |
| JP2001080952A (en) * | 1999-09-09 | 2001-03-27 | Tdk Corp | Magnetic ferrite material |
| US6773619B2 (en) * | 2001-07-17 | 2004-08-10 | Tdk Corporation | Magnetic core for transformer, Mn-Zn based ferrite composition and methods of producing the same |
| CN1186785C (en) * | 2002-09-13 | 2005-01-26 | 无锡晶石磁性电子器件有限公司 | Manganese-zinc ferrite magnetic core mfg. method |
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