CN106045494A - Manganese-zinc soft magnetic ferrite material and preparing method thereof - Google Patents
Manganese-zinc soft magnetic ferrite material and preparing method thereof Download PDFInfo
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- CN106045494A CN106045494A CN201610379003.XA CN201610379003A CN106045494A CN 106045494 A CN106045494 A CN 106045494A CN 201610379003 A CN201610379003 A CN 201610379003A CN 106045494 A CN106045494 A CN 106045494A
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- soft magnetic
- magnetic ferrite
- lithium chloride
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- 239000000463 material Substances 0.000 title claims abstract description 43
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- WJZHMLNIAZSFDO-UHFFFAOYSA-N manganese zinc Chemical compound [Mn].[Zn] WJZHMLNIAZSFDO-UHFFFAOYSA-N 0.000 title abstract 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims abstract description 56
- 239000000654 additive Substances 0.000 claims abstract description 27
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- UPWOEMHINGJHOB-UHFFFAOYSA-N oxo(oxocobaltiooxy)cobalt Chemical compound O=[Co]O[Co]=O UPWOEMHINGJHOB-UHFFFAOYSA-N 0.000 claims abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 10
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims description 23
- 239000011701 zinc Substances 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 20
- 238000013016 damping Methods 0.000 claims description 17
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 15
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 8
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims description 8
- 239000011787 zinc oxide Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000000470 constituent Substances 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 239000011236 particulate material Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 description 6
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2658—Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
- C04B35/62615—High energy or reactive ball milling
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62695—Granulation or pelletising
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- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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- Soft Magnetic Materials (AREA)
Abstract
The invention provides a preparing method of a manganese-zinc soft magnetic ferrite material. In the preparing process of the manganese-zinc soft magnetic ferrite material, the secondary impurity adding process is introduced; besides added additives prepared from, by mass, 0.03%-0.05% of CaCo3, 0.35%-0.45% of Co2O3, 0.03%-0.05% of Nb2O5 and 0.02%-0.05% of ZrO in the primary impurity adding process of material preparing, lithium chloride capable of being dissolved in water is added in the secondary impurity adding process, and the additive amount is 200 PPM to 300 PPM. The manganese-zinc soft magnetic ferrite material has the advantages of being wide in temperature range and ultralow in loss.
Description
Technical field
The present invention relates to a kind of Mn-Zn soft magnetic ferrite, particularly to a kind of, there is wide temperature, ultra-low loss characteristic
Mn-Zn soft magnetic ferrite and preparation method thereof.
Background technology
At present, Mn-Zn soft magnetic ferrite is more and more extensive in the application of field of power electronics, particularly at communication electricity
Source aspect, in recent years, along with advancing by leaps and bounds of mechanics of communication, also proposes higher requirement to its supporting basic material.
Along with popularizing of 4G technology, the most all stepping up construction 4G communication base station, the need of its supporting communication power supply
The amount of asking also gets more and more.Mostly building in the wild due to communication base station, in some remote districts, base station is the most all built in spaciousness
Place, these area temperature difference are relatively big, bad environments, and our supporting material is also required to adapt to various environment, so
Wide temperature, the exploitation of low-loss material have just filled up this blank.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide a kind of low-loss Mn-Zn soft magnetic ferrite and preparation thereof
Method.
The present invention is achieved through the following technical solutions:
A kind of Mn-Zn soft magnetic ferrite (JNP96), its main constituent is iron sesquioxide 53.0 ± 0.3%, manganese oxide
36.5 ± 0.2%, zinc oxide 10.5 ± 0.2% (percentage composition is all with molal quantity as units of percent).
The preparation method of above-mentioned Mn-Zn soft magnetic ferrite (JNP96), it is characterised in that comprise the steps of:
(1) by mixing raw materials: above-mentioned iron sesquioxide, mangano-manganic oxide and zinc oxide are mixed, further, above-mentioned raw materials
May be selected to be technical grade；
(2) pelletize: by three kinds of raw material mix homogeneously in pure water, is added binding agent (PVA), is then dried by spray tower
Particulate material is formed after Gan；
(3) pre-burning: carry out pre-burning by rotary kiln, temperature controls at 850～950 DEG C；
(4) sand milling: in this operation, adds sand mill by the additive required for formula, the most once adds miscellaneous, with raw material
It is mixed together grinding；The additive and the mole percent level that add are CaCO30.03～0.05%, Co2O30.35～
0.45%, Nb2O50.03～0.05%, ZrO 0.02～0.05%；
(5) mist projection granulating: identical with step (2), can obtain being beneficial to be pressed into by adjusting spray orifice and the size of swirl plate
The powder particle material of type；
(6) secondary adds miscellaneous: adding lithium chloride, lithium chloride is dissolved in water；Lithium chloride is made aqueous solution, prepares in step (5)
Powder particle material be sprayed among material by damping machine when carrying out damping,
(7) molding
(8) sintering
(9) attrition process makes finished product.
The concentration of above-mentioned lithium chloride is 200～500PPM, preferably 300-400PPM.
Beneficial effect:
Invention introduces secondary and add miscellaneous concept so that it is the content of additive more controllable precise, and material can be reduced
The sintering temperature of material, improves the sintered density of finished product.Secondary adds miscellaneous added lithium chloride and is soluble in water, so can be more
It is conveniently added in material.Secondary adds miscellaneous added lithium chloride and is dissolved in water and makes solution, carries out damping at material powder
In time, be sprayed among material by damping machine, so can make the more uniform of additive and material mixing.Secondary adds miscellaneous added
The lithium chloride entered can play reduction material sintering temperature, improves the effect of finished product sintered density.
Mn-Zn soft magnetic ferrite of the present invention introduces secondary in preparation process and adds miscellaneous operation, except in material system
Standby once add miscellaneous during the mass percent that adds be CaCO30.03～0.05%, Co2O3
0.35～0.45%, Nb2O50.03～0.05%, ZrO 0.02～0.05% additive outside, also at secondary
Add miscellaneous during add the lithium chloride being dissolvable in water water, addition is 200～500PPM, the percent mass that additive respectively forms
Calculate than the gross mass being relative main constituent and obtain.The Mn-Zn soft magnetic ferrite of the present invention has wide temperature, ultra-low loss spy
Property.
In general technical process, once can add miscellaneous, needed for formula in the sand milling operation of MnZn manufacture process
The additive wanted adds sand mill, is mixed together grinding with raw material；And the manufacturing process of the present invention is not only in sand grinding process
Once add miscellaneous, also after spray process, the most once add miscellaneous before molding, secondary is added miscellaneous required by damping machine
Additive join among finished product powder.
It is directly to add in finished product powder dry powder owing to secondary adds miscellaneous, can mix all with powder in order to ensure additive
Even, we have chosen the lithium chloride that can be dissolved in deionized water, utilizes the water jet of damping machine to be sprayed to after solution atomization
Among powder, damping machine rotates with given pace simultaneously, make additive can be evenly distributed on together with water powder dry powder it
In.
Secondary adds miscellaneous can not only more be accurately controlled the content of trace element in manganese-zinc ferrite powder, also can simultaneously
Enough avoid some impurity once add miscellaneous during produce some agglomerations, each ingredient that can make powder is more equal
Even.
Content and the uniformity of trace element important in miscellaneous accurate control manganese-zinc ferrite powder is added by secondary, permissible
Improve the microstructure of manganese-zinc ferrite product, reduce material power attenuation at various temperatures, apply in the various ministrys of electronics industry
Raising efficiency, the effect of energy-saving and emission-reduction can be played among part.
The lithium chloride added by this kind of method, can make the sintering temperature of manganese-zinc ferrite product from original 1350 DEG C
Left and right is reduced to existing about 1280 DEG C (according to the shape and size of product, sintering temperature has ± deviation of 20 DEG C), with
Time product performance can also be better than original product.Exploitation Mn-Zn soft magnetic ferrite secondary adds general labourer's skill, has both saved the energy, again
Improve the performance of product.
Accompanying drawing explanation
Fig. 1 is the curve chart of power attenuation and temperature；
Fig. 2 is conventional Mn-Zn soft magnetic ferrite production process figure；
Fig. 3 is the loss temperature comparisons figure of material of the present invention and other materials.
Detailed description of the invention
Describe the present invention in detail below in conjunction with embodiment, but embodiment should not limit the scope of the present invention.
Embodiment 1:
The preparation method of a kind of Mn-Zn soft magnetic ferrite (JNP96), comprises the steps of:
(1) by mixing raw materials: iron sesquioxide 53.0 ± 0.3%, manganese oxide 36.5 ± 0.2%, zinc oxide 10.5 ±
0.2% (percentage composition is all with molal quantity as units of percent)
(2) pelletize: by three kinds of raw material mix homogeneously in pure water, add a certain amount of binding agent (PVA), then pass through
Spray tower forms particulate material after drying,
(3) pre-burning: carry out pre-burning by rotary kiln, temperature controls at 850～950 DEG C
(4) sand milling: in this operation, adds sand mill by the additive required for formula, the most once adds miscellaneous, with raw material
It is mixed together grinding；The additive and the content that add are CaCO30.03%, Co2O30.35%, Nb2O50.03%, ZrO
0.02%；The mass percent that additive respectively forms is that the gross mass of relative main constituent calculates and obtains.
(5) mist projection granulating: by adjusting spray orifice and the size of swirl plate, obtain the most compressing powder particle material
(6) secondary adds miscellaneous: adding lithium chloride, lithium chloride is made aqueous solution, the powder particle material prepared in step (5) enters
Being sprayed among material by damping machine during row damping, the concentration of lithium chloride is 300PPM.
(7) molding: be pressed into the shape of customer requirement.
(8) sintering: sintering process can be adjusted according to different product, Different Weight etc.
(9) attrition process makes finished product
Embodiment 2:
The preparation method of a kind of Mn-Zn soft magnetic ferrite (JNP96), comprises the steps of:
(1) by mixing raw materials: iron sesquioxide 53.0 ± 0.3%, manganese oxide 36.5 ± 0.2%, zinc oxide 10.5 ±
0.2% (percentage composition is all with molal quantity as units of percent)
(2) pelletize: by three kinds of raw material mix homogeneously in pure water, add a certain amount of binding agent (PVA), then pass through
Spray tower forms particulate material after drying,
(3) pre-burning: carry out pre-burning by rotary kiln, temperature controls at 850～950 DEG C
(4) sand milling: in this operation, adds sand mill by the additive required for formula, the most once adds miscellaneous, with raw material
It is mixed together grinding；The additive and the content that add are CaCO30.03%, Co2O30.35%, Nb2O50.03%, ZrO
0.02%；The mass percent that additive respectively forms is that the gross mass of relative main constituent calculates and obtains.
(5) mist projection granulating: by adjusting spray orifice and the size of swirl plate, obtain the most compressing powder particle material
(6) secondary adds miscellaneous: adding lithium chloride, lithium chloride is made aqueous solution, the powder particle material prepared in step (5) enters
Being sprayed among material by damping machine during row damping, the concentration of lithium chloride is 400PPM.
(7) molding: be pressed into the shape of customer requirement.
(8) sintering: sintering process can be adjusted according to different product, Different Weight etc.
(9) attrition process makes finished product
Embodiment 3:
The preparation method of a kind of Mn-Zn soft magnetic ferrite (JNP96), comprises the steps of:
(1) by mixing raw materials: iron sesquioxide 53.0 ± 0.3%, manganese oxide 36.5 ± 0.2%, zinc oxide 10.5 ±
0.2% (percentage composition is all with molal quantity as units of percent)
(2) pelletize: by three kinds of raw material mix homogeneously in pure water, add a certain amount of binding agent (PVA), then pass through
Spray tower forms particulate material after drying,
(3) pre-burning: carry out pre-burning by rotary kiln, temperature controls at 850～950 DEG C
(4) sand milling: in this operation, adds sand mill by the additive required for formula, the most once adds miscellaneous, with raw material
It is mixed together grinding；The additive and the content that add are CaCO30.05%, Co2O30.45%, Nb2O50.05%, ZrO
0.05%；The mass percent that additive respectively forms is that the gross mass of relative main constituent calculates and obtains.
(5) mist projection granulating: by adjusting spray orifice and the size of swirl plate, obtain the most compressing powder particle material
(6) secondary adds miscellaneous: adding lithium chloride, lithium chloride is made aqueous solution, the powder particle material prepared in step (5) enters
Being sprayed among material by damping machine during row damping, the concentration of lithium chloride is 400PPM.
(7) molding: be pressed into the shape of customer requirement.
(8) sintering: sintering process can be adjusted according to different product, Different Weight etc.
(9) attrition process makes finished product
Embodiment 4
The preparation method of a kind of Mn-Zn soft magnetic ferrite (JNP96), comprises the steps of:
(1) by mixing raw materials: iron sesquioxide 53.0 ± 0.3%, manganese oxide 36.5 ± 0.2%, zinc oxide 10.5 ±
0.2% (percentage composition is all with molal quantity as units of percent)
(2) pelletize: by three kinds of raw material mix homogeneously in pure water, add a certain amount of binding agent (PVA), then pass through
Spray tower forms particulate material after drying,
(3) pre-burning: carry out pre-burning by rotary kiln, temperature controls at 850～950 DEG C
(4) sand milling: in this operation, adds sand mill by the additive required for formula, the most once adds miscellaneous, with raw material
It is mixed together grinding；The additive and the content that add are CaCO30.035%, Co2O30.45%, Nb2O50.04%, ZrO
0.03%；The mass percent that additive respectively forms is that the gross mass of relative main constituent calculates and obtains.
(5) mist projection granulating: by adjusting spray orifice and the size of swirl plate, obtain the most compressing powder particle material
(6) secondary adds miscellaneous: adding lithium chloride, lithium chloride is made aqueous solution, the powder particle material prepared in step (5) enters
Being sprayed among material by damping machine during row damping, the concentration of lithium chloride is 500PPM.
(7) molding: be pressed into the shape of customer requirement.
(8) sintering: sintering process can be adjusted according to different product, Different Weight etc.
(9) attrition process makes finished product
Mn-Zn soft magnetic ferrite (JNP96) prepared by the present invention can make the sintering temperature of manganese-zinc ferrite product from
About 1350 DEG C originally are reduced to existing about 1280 DEG C, and (according to the shape and size of product, sintering temperature has ± 20
DEG C deviation), the performance of product can also be better than original product simultaneously.Exploitation Mn-Zn soft magnetic ferrite secondary adds general labourer's skill, both
Save the energy, improve again the performance of product.
Present invention JNP96 material newly developed reduces about 10% than traditional wide-temperature and low-consumption 95 material overall losses,
Can further promote the curve of the efficiency of power supply, concrete power attenuation and temperature as shown in Figure 1.
EE70 manganese-zinc ferrite core that following table and Fig. 3 are JNP96 material to be simultaneously manufactured with 95 materials before and its
Loss temperature comparisons's data of his company 96 material:
Table 1 is lost temperature comparisons's data
From the point of view of upper table 1 and Fig. 3, the product that JNP96 material is fabricated by substantially is better than other materials in loss.
Embodiment described above is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (4)
1. a Mn-Zn soft magnetic ferrite, its main constituent with mole percent level be calculated as iron sesquioxide 53.0 ±
0.3%, manganese oxide 36.5 ± 0.2%, zinc oxide 10.5 ± 0.2%, it is characterised in that: the additive of addition is CaCO3 0.03
～0.05%, Co2O30.35～0.45%, Nb2O50.03～0.05%, ZrO 0.02～0.05%.
Mn-Zn soft magnetic ferrite the most according to claim 1, it is characterised in that: it is additionally added lithium chloride.
Mn-Zn soft magnetic ferrite the most according to claim 2, it is characterised in that: lithium chloride adds in form of an aqueous solutions
Entering, concentration is 200-500PPM, preferably 300-500PPM.
4. a preparation method for Mn-Zn soft magnetic ferrite, comprises the steps:
(1) by mixing raw materials: iron sesquioxide, mangano-manganic oxide and zinc oxide are mixed；
(2) pelletize: by three kinds of raw material mix homogeneously in pure water, adds binding agent (PVA), after then being dried by spray tower
Form particulate material；
(3) pre-burning: carry out pre-burning by rotary kiln, temperature controls at 850～950 DEG C；
(4) sand milling: in this operation, adds sand mill by the additive required for formula, the most once adds miscellaneous, together with raw material
Mixed grinding；The additive and the mole percent level that add are CaCO30.03～0.05%, Co2O30.35～0.45%,
Nb2O50.03～0.05%, ZrO 0.02～0.05%；
(5) mist projection granulating: by adjusting spray orifice and the size of swirl plate, obtain the most compressing powder particle material；
(6) secondary adds miscellaneous: adding lithium chloride, lithium chloride is dissolved in water；Lithium chloride is made aqueous solution, in powder prepared by step (5)
End particulate material carries out being sprayed among material by damping machine during damping；
(7) molding；
(8) sintering；
(9) attrition process makes finished product.
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