CN101206940A - Method for lot production of MnZn power ferrite containing high frequency and low loss - Google Patents
Method for lot production of MnZn power ferrite containing high frequency and low loss Download PDFInfo
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- CN101206940A CN101206940A CNA2007101565447A CN200710156544A CN101206940A CN 101206940 A CN101206940 A CN 101206940A CN A2007101565447 A CNA2007101565447 A CN A2007101565447A CN 200710156544 A CN200710156544 A CN 200710156544A CN 101206940 A CN101206940 A CN 101206940A
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Abstract
The invention belongs to the magnetic material field, in particular relates to a method for the mass production of a MnZn power ferrite with high-frequency and low loss. The invention mainly solves the technical problems existing in the prior art that the utilization range is limited, and the energy consumption is large, etc., and provides the method for the mass production of the MnZn power ferrite with high-frequency and low loss. The invention comprises the following main steps: raw materials are weighed, and then vibrated and milled to obtain powder lot; the powder lot is directly pre-burned by adopting a double push plate air kiln to obtain preburning material; the preburning material is sanded by adopting a sand mill; the preburning material is molded by adopting a fully automatic dry press machine; a molded blank is sintered by adopting an asintering furnace; the granule manufacture is performed to the blank by adopting a spray drying granulating machine; the surface of the blank is processed to the roughness degree that Ra is equals to 0.2 to 1.4 microns by adopting a double axle grinding machine.
Description
Technical field
The invention belongs to field of magnetic material.Relate in particular to a kind of method of lot production of MnZn power ferrite containing high frequency and low loss.
Background technology
At present domestic about in the method for producing the MnZn power ferrite, adopt mixing, pre-burning, doping, secondary ball milling, moulding, sintering several steps mostly.But because the difference of the material that various MnZn power ferrites are selected for use can adopt different processing methods, the MnZn power ferrite that obtains can produce difference very big on the performance because of the difference of small materials variance or production technology.
As one piece of China Patent No. disclosure of the Invention that is CN200610022470.3 a kind of preparation method of high frequency high power ferrite material, it may further comprise the steps: 1) mix: with 51～55mol%Fe2O3,5～10mol%ZnO, surplus is that the material powder of MnCO3 mixes; 2) pre-burning: step 1 gained compound is carried out pre-burning; 3) mix: step 2 gained material powder is added additive: 0.01～0.4wt%CaO, 0.01～0.2wt%Nb2O5,0.01～0.1wt%K2CO3 by following mass ratio, and the TiO2 and the SnO2 that is no more than 0.3wt% that are no more than 0.5wt%; 4) secondary ball milling: with the material powder that obtains in the step 3 ball milling once more; 5) moulding: step 4 ball milling gained material powder is added 8～12wt% organic bond, and mixing after the granulation, is pressed into blank; 6) atmosphere sintering: step 5 gained blank is placed sintering in the atmosphere sintering furnace.The MnZn power ferrite scope of application of the making of the method is limited, and between 1MHz～3MHz, and energy consumption is bigger.
Summary of the invention
The present invention mainly is technical problems such as the solution existing in prior technology scope of application is limited, and energy consumption is big, provides a kind of scope of application wide, the method for the lot production of MnZn power ferrite containing high frequency and low loss that energy loss is low.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: the method for lot production of MnZn power ferrite containing high frequency and low loss may further comprise the steps:
A) batching and vibration: weighing raw materials, adopt vibrating ball-mill vibration raw material then, the vibration time is 0.5～1 hour, obtains powder;
B) pre-burning: adopt two push pedal air kilns directly powder to be carried out pre-burning, temperature is 800 ℃～1000 ℃, and the time is 2～3 hours, obtains pre-imitation frosted glass;
C) sand milling: pre-imitation frosted glass adopts sand mill according to pre-imitation frosted glass: abrading-ball: the ratio of water=1: 5～6: 0.55～0.65 is carried out sand milling, and the time is 110～130 minutes;
D) moulding: adopt the full-automatic dry press that pre-imitation frosted glass is carried out to type, the green density after the moulding is 2.8～3.3g/cm
3
E) sintering: the blank after adopting sintering furnace to moulding carries out sintering, and sintering temperature is 1220 ℃～1280 ℃, sintering time 3～5 hours;
F) mist projection granulating: adopt the spray drying granulation machine that blank is carried out granulation, inlet temperature is 250～290 ℃, and outlet temperature is 120～150 ℃, and loose specific weight is 1.2～1.8g/cm
3Flow angle is more than 28 °;
G) mill processing: adopt the twin shaft grinding machine that the blank surface roughness is machined to Ra=0.2～1.4 μ m.
In the method for above-mentioned lot production of MnZn power ferrite containing high frequency and low loss, as preferably, the granular size of powder is 1.5～2.2 μ m in the described steps A.
In the method for above-mentioned lot production of MnZn power ferrite containing high frequency and low loss, as preferably, the powder particle mean size through the sand milling fragmentation among the described step C is 1.0～1.4 μ m.
In the method for above-mentioned lot production of MnZn power ferrite containing high frequency and low loss, as preferably, described step D, the blank dimension tolerance after the moulding is ± 0.1mm.
In the method for above-mentioned lot production of MnZn power ferrite containing high frequency and low loss, as preferably, described step e through row, and adopts the top-hat kiln sintering under atmosphere, temperature uniformly.
Therefore, the present invention has the following advantages:
The scope of application is wide, and energy loss is low, and it is good to obtain microstructure, and the initial permeability of material is higher, the MnZn power ferrite material that the power loss under the high frequency is lower.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1:
The MnZn ferrite, it basic composition is the Fe of 52～56mol%
2O
3, 1～4mol% ZnO, all the other are MnO.The SiO that contains 0.001～0.008wt% in its accessory ingredient
2CaCO with 0.1～0.4wt%
3Above accessory ingredient is to be equivalent to Fe
2O
3, MnO, ZnO total amount calculate by weight percentage.
The flow process of the ferritic production technology of this MnZn is:
1) batching: use the electronic balance weighing raw materials, guarantee the accurate of weighing.
2) vibration: adopt the vibrating ball-mill vibration, the vibration time is 0.5 hour.
3) pre-burning: adopt two push pedal air kilns directly powder to be carried out pre-burning, temperature and time is 800 ℃～900 ℃, and the time is 2 hours.
4) sand milling: pre-imitation frosted glass adopts sand mill to carry out sand milling, and the time is 110 minutes, imitation frosted glass: abrading-ball: water=1: 5: 0.55 is 1.0 μ m through broken powder particle mean size.
5) moulding: adopt the full-automatic dry press to carry out, green density is at 2.8～3.3g/cm
3, dimensional tolerance is at ± 0.1mm.
6) sintering: adopt sintering furnace to carry out, guarantee atmosphere, the uniformity of temperature, and adopt the top-hat kiln sintering, sintering temperature is 1220 ℃, 5 hours time.
7) mist projection granulating: adopt the spray drying granulation machine to carry out, inlet temperature is 250 ℃, and outlet temperature is 120 ℃, and loose specific weight is 1.2g/cm3; Flow angle is more than 28 °.
8) mill processing: adopt the twin shaft grinding machine to carry out, surface roughness reaches Ra=0.2 μ m.
Embodiment 2:
1) batching: use the electronic balance weighing raw materials, guarantee the accurate of weighing.
2) vibration: adopt the vibrating ball-mill vibration, the vibration time is 1 hour.
3) pre-burning: adopt two push pedal air kilns directly powder to be carried out pre-burning, temperature and time is 900 ℃～1000 ℃, and the time is 3 hours.
4) sand milling: pre-imitation frosted glass adopts sand mill to carry out sand milling, and the time is 110 minutes, imitation frosted glass: abrading-ball: water=1: 6: 0.65 is 1.0 μ m through broken powder particle mean size.
5) moulding: adopt the full-automatic dry press to carry out, green density is at 2.8～3.3g/cm
3, dimensional tolerance is at ± 0.1mm.
6) sintering: adopt sintering furnace to carry out, guarantee atmosphere, the uniformity of temperature, and adopt the top-hat kiln sintering, sintering temperature is 1280 ℃, 3 hours time.
7) mist projection granulating: adopt the spray drying granulation machine to carry out, inlet temperature is 290 ℃, and outlet temperature is 150 ℃, and loose specific weight is 1.8g/cm3; Flow angle is more than 32 °.
8) mill processing: adopt the twin shaft grinding machine to carry out, surface roughness reaches Ra=1.4 μ m.
Embodiment 3:
The flow process of this tool of production technology is:
1) batching: use the electronic balance weighing raw materials, guarantee the accurate of weighing.
2) vibration: adopt the vibrating ball-mill vibration, the vibration time is 0.5～1 hour
3) pre-burning: adopt two push pedal air kilns directly powder to be carried out pre-burning, temperature and time is generally 900 ℃ (± 100 ℃) * 2.5 hours
4) sand milling: pre-imitation frosted glass adopts sand mill to carry out sand milling, and the time is 130 minutes, material: ball: water=1: 6: 0.65 is 1.4 μ m through broken powder particle mean size.
5) moulding: adopt the full-automatic dry press to carry out, green density is controlled at 2.8～3.3g/cm3, and dimensional tolerance is controlled at ± and the 0.1mm. reviewer inspects by random samples the green density and the size of moulding.
6) sintering: adopt sintering furnace to carry out, guarantee atmosphere, the uniformity of temperature, and adopt the top-hat kiln sintering, and sintering temperature is 1250 ℃ * 4 hours, the reviewer should select the cracking that occurs in the sintering, distortion grade waste product, must not flow into next procedure.
7) mist projection granulating: adopt the spray drying granulation machine to carry out, inlet temperature is 250～290 ℃, and outlet temperature is 120～150 ℃, and loose specific weight is 1.2～1.8g/cm3; Flow angle is more than 28～32 °.Particle size distribution.
8) mill processing: adopt the twin shaft grinding machine to carry out, surface roughness reaches Ra=0.2～1.4 μ m.
The comparative example 1:
The scope of application of the MnZn power ferrite material of this method manufacturing can be 200KHz～3MHz, and the common MnZn power ferrite scope of application is 1MHz～3MHz, and the MnZn power ferrite material of this method manufacturing has the wide characteristics of the scope of application.
The MnZn power ferrite material of this method manufacturing performance 25 ℃, 60 ℃, 100 ℃ the time is tested, obtains following data:
The MnZn power ferrite material μ i of this method manufacturing is 1200 ± 25%, and μ a is at 100KHz, 200mT, 100 ℃ of time＞3000;
When external condition 1194A/m, test b s, Br, Hc obtain following data.
Bs is 480mT in the time of 25 ℃; Bs is 450mT in the time of 60 ℃; Bs is 380mT in the time of 100 ℃;
Br is 130mT in the time of 25 ℃; Br is 110mT in the time of 60 ℃; Br is 100mT in the time of 98 ℃;
Hc is 36A/m in the time of 25 ℃; Hc is 60A/m in the time of 31 ℃; Hc is 27A/m in the time of 100 ℃;
External condition 500KHz, during 50mT, Pcv is 130Kw/m3 in the time of 25 ℃; Pcv is 80Kw/m3 in the time of 60 ℃; Pcv is 80Kw/m3 in the time of 100 ℃;
External condition 1MHz, during 30mT, Pcv is 800Kw/m3 in the time of 100 ℃;
External condition 3MHz, during 10mT, Pcv is 260Kw/m3 in the time of 100 ℃.
At specific embodiment described herein only is that the present invention's spirit and part experiment are illustrated.Those skilled in the art in the invention can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (5)
1. the method for a lot production of MnZn power ferrite containing high frequency and low loss may further comprise the steps:
A) batching and vibration: weighing raw materials, adopt vibrating ball-mill vibration raw material then, the vibration time is 0.5～1 hour, obtains powder;
B) pre-burning: adopt two push pedal air kilns directly powder to be carried out pre-burning, temperature is 800 ℃～1000 ℃, and the time is 2～3 hours, obtains pre-imitation frosted glass;
C) sand milling: pre-imitation frosted glass adopts sand mill according to pre-imitation frosted glass: abrading-ball: the ratio of water=1: 5～6: 0.55～0.65 is carried out sand milling, and the time is 110～130 minutes;
D) moulding: adopt the full-automatic dry press that pre-imitation frosted glass is carried out to type, the green density after the moulding is 2.8～3.3g/cm
3
E) sintering: the blank after adopting sintering furnace to moulding carries out sintering, and sintering temperature is 1220 ℃～1280 ℃, sintering time 3～5 hours;
F) mist projection granulating: adopt the spray drying granulation machine that blank is carried out granulation, inlet temperature is 250～290 ℃, and outlet temperature is 120～150 ℃, and loose specific weight is 1.2～1.8g/cm
3Flow angle is more than 28 °;
G) mill processing: adopt the twin shaft grinding machine that the blank surface roughness is machined to Ra=0.2～1.4 μ m.
2. the method for lot production of MnZn power ferrite containing high frequency and low loss according to claim 1, it is characterized in that: the granular size of powder is 1.5～2.2 μ m in the described steps A.
3. the method for lot production of MnZn power ferrite containing high frequency and low loss according to claim 1 is characterized in that: the powder particle mean size through the sand milling fragmentation among the described step C is 1.0～1.4 μ m.
4. according to the method for claim 1 or 2 or 3 described lot production of MnZn power ferrite containing high frequency and low loss, it is characterized in that: described step D, the blank dimension tolerance after the moulding is ± 0.1mm.
5. according to the method for claim 1 or 2 or 3 described lot production of MnZn power ferrite containing high frequency and low loss, it is characterized in that: described step e through row, and adopts the top-hat kiln sintering under uniformly atmosphere, temperature.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531637A (en) * | 2010-12-22 | 2012-07-04 | 上海宝钢磁业有限公司 | Dry process for manufacturing high performance soft ferrite powder |
| CN102643083A (en) * | 2012-04-01 | 2012-08-22 | 天长市昭田磁电科技有限公司 | Method for producing soft magnetic ferrite core |
| CN109384463A (en) * | 2018-12-30 | 2019-02-26 | 常熟浩博电子科技有限公司 | High frequency high energy efficiency converts MnZn ferrite and preparation method thereof |
-
2007
- 2007-11-08 CN CN2007101565447A patent/CN101206940B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531637A (en) * | 2010-12-22 | 2012-07-04 | 上海宝钢磁业有限公司 | Dry process for manufacturing high performance soft ferrite powder |
| CN102531637B (en) * | 2010-12-22 | 2015-05-20 | 上海宝钢磁业有限公司 | Dry process for manufacturing high performance soft ferrite powder |
| CN102643083A (en) * | 2012-04-01 | 2012-08-22 | 天长市昭田磁电科技有限公司 | Method for producing soft magnetic ferrite core |
| CN102643083B (en) * | 2012-04-01 | 2014-10-29 | 天长市昭田磁电科技有限公司 | Method for producing soft magnetic ferrite core |
| CN109384463A (en) * | 2018-12-30 | 2019-02-26 | 常熟浩博电子科技有限公司 | High frequency high energy efficiency converts MnZn ferrite and preparation method thereof |
| CN109384463B (en) * | 2018-12-30 | 2021-04-02 | 常熟浩博电子科技有限公司 | High-frequency high-energy-efficiency conversion MnZn ferrite and preparation method thereof |
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