CN100372800C - Process for preparing high density double 5000Mn Zn ferrite material - Google Patents
Process for preparing high density double 5000Mn Zn ferrite material Download PDFInfo
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- CN100372800C CN100372800C CNB2005100218727A CN200510021872A CN100372800C CN 100372800 C CN100372800 C CN 100372800C CN B2005100218727 A CNB2005100218727 A CN B2005100218727A CN 200510021872 A CN200510021872 A CN 200510021872A CN 100372800 C CN100372800 C CN 100372800C
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Abstract
The invention discloses a preparing method of high-density double-5000MnZn ferrite material, which is characterized by the following: making the density of double-5000MnZn ferrite material less than 5.0g .cm-3 directly without punching or heat isostatic pressure.
Description
Technical field
Present technique belongs to the Ferrite Material preparing technical field, particularly the preparing technical field of high-density MnZn Ferrite Material.
Background technology
Along with Magnetographic Technology to high record density, high frequency high fidelity, large vol and miniaturization development, require to have high-density (d), high saturated magnetic induction (Bs) and high magnetic permeability (μ) as the MnZn ferrite magnetic recording materials of magnetic recording system " heart ".High-density makes MnZn ferrite magnetic recording materials have good wear resistance and hardness, magnetic head was saturated when high saturated magnetic induction can prevent that record current is excessive, high magnetic permeability has determined the material good frequency characteristic, high-density is the assurance of high saturated magnetic induction, and magnetic permeability depends on density and void content.And present two 5000 (magnetic permeability 5000, saturation induction density 5000Gs) MnZn Ferrite Materials, its density d＜5.0gcm
-3
Existing double 5000 Mn Zn ferrite main body prescription is Fe
2O
3, ZnO and Mn
3O
4, behind oversintering, forming composite spinelle MnZn ferrite, its lattice parameter is bigger, and theoretical density is not high, improves the density difficulty of sintered compact.In order to improve MnZn ferrite density, since the seventies in last century, prior art all is that employing hot pressing (HPF), hot isostatic pressing (HIP) method have prepared large size, highdensity MnZn Ferrite Material (is seen document 1, HirotaE., MiharaT.andIkedaA.Hot-pressedMnZn ferrite for magnetic recording heads.Intermag.Conf.IEEE Trans onMagn., 1971: 337; 2, Hu Guoguang, Wu Yulin. the surperficial magnetosphere of hot press ferrite. magneticsubstance and device .1989,20 (4): 17; 3, Vijay K.B.and Rajinder K.P.Hot-pressed Mn-Zn-Niand Mn-Zn-Co ferritesfor magnetic recording heads.IEEE TransonMagn.1992,28 (1): 21; 4, Takama E.and ItoM.New Mn-Zn ferrite fabricated by hot isostatic pressing.IEEE TransonMagn.1979, MAG-15 (6): 1858; 5, Wang Chonglin. HIP Ferrites for Magnetic Heads. powder metallurgy technology .1998,16 (1): 5), but above method all needs specific equipment, complex process, difficulty is bigger, and yield rate is low, and cost is higher.
The content of invention
High density double 5000 Mn Zn ferrite material preparation method provided by the invention, prepare high-density MnZn ferrite at hot pressing (HPF), hot isostatic pressing (HIP) method and need use specific equipment, complex process, the deficiency that cost is higher, adopt new prescription, novel process, make present method technology simple, cost is lower, density d〉5.0gcm
-3
The preparation method of high density double 5000 Mn Zn ferrite material, its feature comprises the steps:
1, batching
Adopt following prescription batching: 51～54mol%Fe
2O
3, 12～16mol%ZnO, 1～3mol%NiO, surplus is MnCO
3
2, ball milling
To the material powder be mixed with material loading powder ball milling 4～6 hours in ball mill;
3, pre-burning
With the pre-burning 1～3 hour in 850～950 ℃ of stoves of step 2 gained ball milling material;
4, mix
Step 3 gained material powder is added following additive: 0.1～0.4wt%TiO by weight percentage
2, 0.01～0.03wt%CaO, 0.02～0.2wt%V
2O
5, 0.02～0.2wt%Bi
2O
3, 0.01～0.1wt%MoO
3
5, secondary ball milling
With the material powder that obtains in the step 4 ball milling 12～20 hours in planetary ball mill;
6, moulding
Step 5 gained material powder is added 8～12wt% organic binder bond by weight percentage, and mixing after the granulation, is pressed into blank with granular powder on press;
7, atmosphere sintering
With step 6 gained blank in atmosphere sintering furnace, in oxygen partial pressure is 1.5～5% balanced atmosphere, 1370～1420 ℃ of sintering temperatures 3～7 hours.
Through the high density double 5000 Mn Zn ferrite material that above prepared goes out, the uniform crystal particles densification, particle diameter is about 20 μ m.Magnetism of material can be tested with the rugged SY-8232B-H analyser of Japanese rock, and density is tested with MD-2 magnetic core density auto testing instrument, and its performance index are as follows:
Initial permeability μ i:5000 ± 20%
Under the magnetic field of the frequency of 8kHz, 1～8mT, mean amplitude of tide magnetic permeability μ a:5000 ± 20%
Saturation induction density Bs:5000 ± 20%
Coercivity H:＜5Am
-1
Remanent magnetism Br:＜100mT
Density d:〉5.0gcm
-3
Description of drawings
Fig. 1, high density double 5000 Mn Zn ferrite material preparation method process flow sheet
Fig. 2, the SEM picture of the high density double 5000 Mn Zn ferrite material of preparation
As we can see from the figure, the high density double 5000 Mn Zn ferrite material internal porosity of preparation is less, the uniform crystal particles densification, and particle diameter is about 20 μ m.
Specific embodiment:
1, batching
Adopt following molar ratio ingredient: 53mol%Fe
2O
3, 15mol%ZnO, 1.5mol%NiO, 30.5mol%MnCO
3
2, ball milling
To the material powder be mixed with material loading powder ball milling 4 hours in ball mill;
3, pre-burning
With the pre-burning 1.5 hours in 930 ℃ of stoves of step 2 gained ball milling material;
4, mix
Step 3 gained material powder is added following additive: 0.3wt%TiO by weight percentage
2, 0.02wt%CaO, 0.1wt%V
2O
5, 0.1wt%Bi
2O
3, 0.05wt%MoO
3
5, secondary ball milling
With the material powder that obtains in the step 4 ball milling 14 hours in planetary ball mill;
6, moulding
Step 5 gained material powder is added the 10wt% organic binder bond by weight percentage, and mixing after the granulation, is pressed into blank with granular powder on press;
7, atmosphere sintering
With step 6 gained blank in atmosphere sintering furnace, in oxygen partial pressure is 3% balanced atmosphere, 1390 ℃ of sintering temperatures 4 hours.
Through the high density double 5000 Mn Zn ferrite material that above prepared goes out, its performance index are as follows:
Initial permeability μ i:5200
Under the magnetic field of the frequency of 8kHz, 1～8mT, mean amplitude of tide magnetic permeability μ a:5600
Saturation induction density Bs:4900Gs
Coercivity H: 4.5Am
-1
Remanent magnetism Br:80mT
Density d: 5.05gcm
-3
Claims (2)
1. the preparation method of a high density double 5000 Mn Zn ferrite material, its feature comprises the steps:
(1) batching
Adopt following prescription batching: 51～54mol%Fe
2O
3, 12～16mol%ZnO, 1～3mol%NiO, surplus is MnCO
3
(2) ball millings
To the material powder be mixed with material loading powder ball milling 4～6 hours in ball mill;
(3) pre-burning
With the pre-burning 1～3 hour in 850～950 ℃ of stoves of step 2 gained ball milling material;
(4) mix
Step 3 gained material powder is added following additive: 0.1～0.4wt%TiO by weight percentage
2, 0.01～0.03wt%CaO, 0.02～0.2wt%V
2O
5, 0.02～0.2wt%Bi
2O
3, 0.01～0.1wt%MoO
3
(5) secondary ball milling
With the material powder that obtains in the step 4 ball milling 12～20 hours in planetary ball mill;
(6) moulding
Step 5 gained material powder is added 8～12wt% organic binder bond by weight percentage, and mixing after the granulation, is pressed into blank with granular powder on press;
(7) atmosphere sintering
With step 6 gained blank in atmosphere sintering furnace, in oxygen partial pressure is 1.5～5% balanced atmosphere, 1370～1420 ℃ of sintering temperatures 3～7 hours.
2. ferrite preparation method according to claim 1 is characterized in that may further comprise the steps:
(1) batching
Adopt following molar ratio ingredient: 53mol%Fe
2O
3, 15mol%ZnO, 1.5mol%NiO, 30.5mol%MnCO
3
(2) ball millings
To the material powder be mixed with material loading powder ball milling 4 hours in ball mill;
(3) pre-burning
With the pre-burning 1.5 hours in 930 ℃ of stoves of step 2 gained ball milling material;
(4) mix
Step 3 gained material powder is added following additive: 0.3wt%TiO by weight percentage
2, 0.02wt%CaO, 0.1wt%V
2O
5, 0.1wt%Bi
2O
3, 0.05wt%MoO
3
(5) secondary ball milling
With the material powder that obtains in the step 4 ball milling 14 hours in planetary ball mill;
(6) moulding
Step 5 gained material powder is added the 10wt% organic binder bond by weight percentage, and mixing after the granulation, is pressed into blank with granular powder on press;
(7) atmosphere sintering
With step 6 gained blank in atmosphere sintering furnace, in oxygen partial pressure is 3% balanced atmosphere, 1390 ℃ of sintering temperatures 4 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100218727A CN100372800C (en) | 2005-10-18 | 2005-10-18 | Process for preparing high density double 5000Mn Zn ferrite material |
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|---|---|---|---|
| CNB2005100218727A CN100372800C (en) | 2005-10-18 | 2005-10-18 | Process for preparing high density double 5000Mn Zn ferrite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1951864A CN1951864A (en) | 2007-04-25 |
| CN100372800C true CN100372800C (en) | 2008-03-05 |
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ID=38058447
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|---|---|---|---|
| CNB2005100218727A Expired - Fee Related CN100372800C (en) | 2005-10-18 | 2005-10-18 | Process for preparing high density double 5000Mn Zn ferrite material |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486567B (en) * | 2008-01-14 | 2012-08-22 | 王永安 | Preparation of high-frequency high temperature low loss MnNiZn ferrite material |
| CN101412621B (en) * | 2008-10-23 | 2011-08-03 | 电子科技大学 | High-magnetic conductivity high-saturation magnetic strength MnZn ferrite material and preparation thereof |
| CN101928134A (en) * | 2010-04-29 | 2010-12-29 | 中冶恒通冷轧技术有限公司 | Barium ferrite pre-sintered material and preparation method thereof |
| CN107540360B (en) * | 2016-06-25 | 2020-12-04 | 临沂春光磁业有限公司 | Ferrite material with high saturation magnetic induction intensity and high direct current superposition |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294099A (en) * | 1999-10-12 | 2001-05-09 | Tdk株式会社 | Nickel-Mn-Zn Series ferrite |
-
2005
- 2005-10-18 CN CNB2005100218727A patent/CN100372800C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294099A (en) * | 1999-10-12 | 2001-05-09 | Tdk株式会社 | Nickel-Mn-Zn Series ferrite |
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| CN1951864A (en) | 2007-04-25 |
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Application publication date: 20070425 Assignee: Haining Lianfeng Magnet Industry Co., Ltd. Assignor: University of Electronic Science and Technology of China Contract record no.: 2010330000337 Denomination of invention: Process for preparing high density double 5000Mn Zn ferrite material Granted publication date: 20080305 License type: Exclusive License Record date: 20100329 |
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Change date: 20111125 Contract record no.: 2010330000337 Assignee after: Haining Lianfeng Magnet Industry Co., Ltd. Assignee before: Haining Lianfeng Magnet Industry Co., Ltd. |
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Granted publication date: 20080305 Termination date: 20171018 |