CN107673753B - High-performance Mn-Zn ferrite with wireless radiation interference resistance and preparation method thereof - Google Patents
High-performance Mn-Zn ferrite with wireless radiation interference resistance and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-performance Mn-Zn ferrite with wireless radiation interference resistance, and the density is more than or equal to 4.85kg/m3And an initial permeability at 25 ℃ of greater than 3400. The Mn-Zn ferrite comprises a main body material and an additive, wherein the sum of the mol percent of the main body material and the additive is 100%; the preparation method comprises the following steps: weighing and processing; pre-burning the main body material; crushing the main material; spray granulation; preparing a blank; and (5) sintering and forming. According to the invention, through adjustment of the formula and the process, on one hand, the initial permeability of the Mn-Zn ferrite is obviously improved, so that the hysteresis coefficient is reduced, on the other hand, the density of the Mn-Zn ferrite is effectively improved, the obtained product has excellent radio radiation interference resistance while meeting the requirements of broadband low loss and high strength, so that the radio radiation interference resistance of the electromagnetic filter is improved from the line interference resistance to the magnetic core per se interference resistance, the radio radiation interference resistance of the electromagnetic filter is effectively promoted, and the market prospect is wide.
Description
Technical Field
The invention relates to the technical field of ferrite preparation, in particular to a high-performance Mn-Zn ferrite with wireless radiation interference resistance and a preparation method thereof.
Background
With the progress of society and the rapid development of science and technology, electromagnetic interference (EMI for short) is gaining more and more attention. Electromagnetic interference can cause data transmission errors, image distortion and even misoperation of electronic equipment, and the consequences are very serious.
The propagation modes of electromagnetic interference are generally divided into conduction and radiation. For suppressing conducted interference, there are many methods, and usually an active or passive filtering method is used, and parameters are calculated and extracted by establishing an equivalent model of a common mode or a differential mode, and a filtering method is used, so that suppression can be effectively performed generally. However, for radiated interference, except for shielding, there are not many methods for suppressing, and at present, only the interference resistance in terms of line design is limited, for example, a filter with an additional metal shielding case is generally used to achieve the interference resistance against wireless radiation.
The research of the theory and the process of magnetic materials shows that because B-H of Mn-Zn ferrite is nonlinear characteristic, B lags behind H by a phase angle, the magnetic core has hysteresis loss under the operation of certain frequency, and after the expansion of Fourier series, the magnetic core can obtain quite abundant odd harmonics at the output end of the transformer.
Disclosure of Invention
The invention mainly solves the technical problem of providing a high-performance Mn-Zn ferrite with wide frequency, low power loss, high strength and wireless radiation interference resistance and a preparation method thereof.
In order to solve the technical problems, the invention adopts a technical scheme that: provides a high-performance Mn-Zn ferrite with wireless radiation interference resistance, and the density of the Mn-Zn ferrite is more than or equal to 4.85kg/m3An initial permeability at 25 ℃ of greater than 3400; the Mn-Zn ferrite includes a host material and an additive, wherein the host material includes Fe2O3MnO and ZnO; the additive comprises CO2O3、TiO2、CaCO3、SiO2、SiO2、ZrO2And Er2O3The sum of the molar percentage of the main body material and the additive is 100%.
In a preferred embodiment of the present invention, the host material comprises 53-54 mol% Fe2O338-38.02 mol% of MnO and 8.0-9.0 mol% of ZnO; the additive comprises 0.01-0.15 mo1 mol% of CO2O30.01 to 0.10mo 1% of TiO20.001 to 0.05mo 1% CaCO30.001 to 0.005mo 1% SiO20.001 to 0.03mo 1% of Nb2O50.001 to 0.01mo 1% ZrO2And 0.001-0.04 mo 1% Er2O3。
In a preferred embodiment of the invention, the Fe2O3Has a specific surface area of more than 4.5m2Per g, SiO therein2The content of (B) is less than or equal to 80ppm, P2O5Content of less than or equal to 10ppm, Al2O3The content of (A) is less than or equal to 30 ppm; the specific surface area of the MnO is 11-15 m2The content of K is less than or equal to 10ppm and the content of Na is less than or equal to 10 ppm; the content of Pb in the ZnO is less than or equal to 10ppm, ASThe content of (B) is less than or equal to 10 ppm.
In order to solve the technical problem, the invention adopts another technical scheme that: the preparation method of the high-performance Mn-Zn ferrite magnetic core with the function of resisting wireless radiation interference is provided, and comprises the following steps:
(1) weighing and processing: weighing the main material and the additive according to the formula ratio, stirring and mixing the weighed main material at a high speed, and then carrying out vibration milling and crushing treatment to obtain the bulk density of 1.3-1.5 g/cm3The host material of (1);
(2) pre-sintering treatment of main body materials: loading the main body material treated in the step (1) into a pre-burning kiln for pre-burning treatment;
(3) and (3) crushing a main material: adding the main material subjected to the pre-sintering treatment in the step (2) into a sand mill for sand milling treatment, and adding the additive weighed in the step (1) in the sand milling process to obtain mixed powder with the average particle size of 1.0-1.2 mu m;
(4) spray granulation: adding deionized water and glue into the mixed powder obtained in the step (3) to prepare slurry, and then carrying out spray granulation on the slurry to obtain granules;
(5) preparing a blank: pressing the granules prepared in the step (4) into a magnetic core blank;
(6) sintering and forming: and (5) loading the blank obtained in the step (5) into a programmed sintering kiln, adjusting the gas environment in the kiln, and performing programmed heating, heat preservation and cooling processes to obtain the high-performance Mn-Zn ferrite magnetic core with wireless radiation interference resistance.
In a preferred embodiment of the invention, in the step (2), the pre-sintering temperature is 950-1050 ℃, and the pre-sintering time is 30-90 min; the flow rate of the main material in the rotary kiln is 3-4 kg/min.
In a preferred embodiment of the present invention, in the step (3), the sanding treatment process conditions are as follows: 300-350 kg/h, and the volume percentage of the materials in the sanding process is 74-78%.
In a preferred embodiment of the present invention, in the step (4), the characteristic parameters of the granules are: particle size distribution of 100-300 μm, and bulk density of 1.3-1.5 g/cm3The weight percentage of the water is 0.15-0.25%, the weight percentage of the glue is 8 per mill, and the repose angle is less than or equal to 30 degrees.
In a preferred embodiment of the present invention, in the step (6), the process conditions of the temperature increase are: firstly, in the atmosphere, raising the temperature from room temperature to 700 ℃ at a heating rate of 0.5-2.0 ℃/min, then adjusting the oxygen partial pressure to be less than 1%, firstly raising the temperature from 700 ℃ to 1200 ℃ at a heating rate of 0.5-2.0 ℃/min, and then raising the temperature from 1200 ℃ to 1250-1340 ℃ at a heating rate of 3-10 ℃/min.
In a preferred embodiment of the present invention, in the step (6), the process conditions of the heat preservation are as follows: the oxygen partial pressure is 5-7%, the heat preservation temperature is 1250-1340 ℃, and the heat preservation time is 3.5-6.5 h.
In a preferred embodiment of the present invention, in the step (6), the process conditions of the temperature reduction are as follows: the oxygen partial pressure is balanced, the temperature is reduced from 1250 to 1340 ℃ to 1000 ℃ at the cooling rate of 0.5 to 2.0 ℃/min, and then the temperature is reduced from 1000 ℃ to the room temperature at the cooling rate of 3.0 to 5.0 ℃/min.
The invention has the beneficial effects that: on the basis of formula adjustment, the high-performance Mn-Zn ferrite with wireless radiation interference resistance obviously improves the initial permeability of the ferrite through reasonable doping process, main material presintering and sintering process adjustment, thereby reducing the hysteresis coefficient of the ferrite, effectively improving the density of the ferrite, ensuring that the obtained magnetic core product has excellent wireless radiation interference resistance while meeting the requirements of broadband, low loss and high strength, improving the anti-interference performance of the electromagnetic filter from the line anti-interference to the self anti-interference of the magnetic core in the aspect of wireless radiation interference resistance, effectively promoting the wireless radiation interference resistance of the electromagnetic filter, and having wide market prospect.
Drawings
FIG. 1 is a schematic view of a magnetic core of Mn-Zn ferrite according to the present invention for testing radio interference resistance;
fig. 2 is a schematic diagram of a conventional ferrite core for testing radio interference resistance.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1 and 2, an embodiment of the present invention includes:
the B-H nonlinear characteristic of Mn-Zn ferrite, because B lags behind H by a phase angle, has hysteresis loss under certain frequency working, so that very rich odd harmonics can be obtained at the output end of the transformer after Fourier expansion. The specific expansion formula is as follows:
consists of: the Rayleigh (Ray) loop equation is developed by Fourier series
Wherein b is a Rayleigh constant.
After ignoring the higher harmonics, there are:
it is clear that B lags H, so:
due to the fact that
Substituting into formula (1) to have:
also, according to the formula of the column grid (L egg):
wherein: a is a hysteresis loss coefficient of the magnetic material,
after finishing the formulas (2) and (3), the following are provided:
namely:
the hysteresis coefficient specified by national standard (GB) of China is represented by η B, wherein:
when (4) is substituted into (5), then
Namely:
therefore, the hysteresis coefficient is inversely proportional to the third power of the initial permeability, and the hysteresis coefficient can be reduced by increasing the initial permeability, so that the anti-electromagnetic interference performance of the ferrite is improved.
The invention discloses a high-performance Mn-Zn ferrite with wireless radiation interference resistance, which effectively improves the initial permeability on one hand through the design of a raw material formula and the adjustment of a forming process, thereby reducing a hysteresis coefficient and enabling the ferrite to have the wireless radiation interference resistance; on the other hand, the Mn-Zn ferrite has higher density and lower hysteresis loss through the adjustment, and has excellent comprehensive performances such as wide frequency, low power consumption, high strength and the like.
The Mn-Zn ferrite disclosed by the invention comprises a main body material and an additive, wherein the sum of the mol percent of the main body material and the mol percent of the additive is 100%, wherein the main body material comprises Fe with the mol percent of 53-54 mol%2O338-38.02 mol% of MnO and 8.0-9.0 mol% of ZnO; the additive comprises 53-54 mol% of Fe2O338-38.02 mol% of MnO and 8.0-9.0 mol% of ZnO; the additive comprises 0.01-0.15 mo1 mol% of CO2O30.01 to 0.10mo 1% of TiO20.001 to 0.05mo 1% CaCO30.001 to 0.005mo 1% SiO20.001 to 0.03mo 1% of Nb2O50.001 to 0.01mo 1% ZrO2And 0.001-0.04 mo 1% Er2O3。
In the above host material, Fe2O3Has the largest influence on the ferrite core by the chemical purity and the physical form, so that the high-purity Fe is used in the invention2O3The purity is more than 99.5 percent, and the specific surface area is more than 4.5m2Per g, SiO therein2The content of (B) is less than or equal to 80ppm, P2O5Content of less than or equal to 10ppm, Al2O3The content of CaO is less than or equal to 30ppm and less than or equal to 50 ppm.
The purity of the MnO is more than 99.7%, and the specific surface area of the MnO is 11-15 m2The content of K is less than or equal to 10ppm and the content of Na is less than or equal to 10 ppm.
The content of Pb in the ZnO is less than or equal to 15ppm, ASThe content of (B) is less than or equal to 10 ppm.
The preparation method of the high-performance Mn-Zn ferrite with the wireless radiation interference resistance comprises the following steps:
(1) weighing and processing: weighing the main material and the additive according to the formula ratio, and stirring and mixing the weighed main material at a high speed for 30-60 min by using a strong mixing device to ensure that all components of the main material are fully contacted and fully stirred uniformly, so as to promote solid phase reaction caused by diffusion of metal ions; after stirring, putting the mixture into a vibration mill mixer for vibration milling and crushing treatment to obtain the bulk density of 1.3-1.5 g/cm3The host material of (1);
(2) pre-sintering treatment of main body materials: loading the main body material treated in the step (1) into a rotary kiln, keeping the flow rate of the main body material in the rotary kiln at 3-4 kg/min, presintering for 30-90 min at 950-1050 ℃, and adjusting the inclination angle, the rotation speed and the oxygen content of the rotary kiln to enable various oxides of the main body material to undergo preliminary solid phase reaction, so as to ensure that the generation rate of ferrite is about 80%;
(3) and (3) crushing a main material: adding the block main body material subjected to the pre-sintering treatment in the step (2) into a sand mill for sand milling treatment to obtain powder with proper granularity, adding the additive weighed in the step (1) in the sand milling process, and finally obtaining mixed powder with the average particle size of 1.0-1.2 mu m through sand milling treatment; wherein, the process conditions of the sanding treatment are as follows: 300-350 kg/h, wherein the volume percentage of the material in the sanding process is 74-78%;
(4) spray granulation: adding deionized water and glue into the mixed powder obtained in the step (3) to prepare slurry, and then carrying out spray granulation on the slurry to obtain granules, wherein the granules have the following characteristic parameters: particle size distribution of 100-300 μm, and bulk density of 1.3-1.5 g/cm3The weight percentage of the water is 0.15-0.25%, the weight percentage of the glue is 8 per mill, the repose angle is less than or equal to 30 degrees, and the content of particles larger than 60 meshes and the content of particles smaller than 180 meshes are not higher than 5%;
(5) preparing a blank: pressing the granules prepared in the step (4) into a magnetic core blank;
(6) sintering and forming: and (3) loading the blank obtained in the step (5) into a programmed sintering kiln, adjusting the gas environment in the kiln, and performing programmed heating, heat preservation and cooling processes to obtain the high-performance Mn-Zn ferrite with wireless radiation interference resistance, wherein the heating process conditions are as follows: firstly, in the atmosphere, raising the temperature from room temperature to 700 ℃ at a temperature rise rate of 0.5-2.0 ℃/min, then adjusting the oxygen partial pressure to be less than 1%, firstly raising the temperature from 700 ℃ to 1200 ℃ at a temperature rise rate of 0.5-2.0 ℃/min, and then raising the temperature from 1200 ℃ to 1250-1340 ℃ at a temperature rise rate of 3-10 ℃/min;
in the step (6), the heat preservation process conditions are as follows: 5-7% of oxygen partial pressure, 1250-1340 ℃ of heat preservation temperature and 3.5-6.5 h of heat preservation time;
in the step (6), the process conditions of temperature reduction are as follows: the oxygen partial pressure is balanced, the temperature is reduced from 1250 to 1340 ℃ to 1000 ℃ at the cooling rate of 0.5 to 2.0 ℃/min, and then the temperature is reduced from 1000 ℃ to the room temperature at the cooling rate of 3.0 to 5.0 ℃/min.
The Mn-Zn ferrite prepared by the method is manufactured into an annular magnetic core, and the performance test is carried out, and the result is as follows: under the condition that the magnetic field intensity is 1194A/m and the temperature is 25-100 ℃, the saturation magnetic flux density is higher than 410-530 mT, and the power loss is lower than 290-380 kW/m at 100kHz, 200mT and the temperature is 25-100 DEG C3The density is more than or equal to 4.85kg/m3And has the advantages of wide frequency, low loss, high strength and the like.
The initial magnetic permeability of the magnetic material at 25 ℃ is more than 3400, and the magnetic material can shield environmental electromagnetic radiation within 10m by radiation test, wherein the specific test conditions are as follows:
and (4) testing standard: EN 55022Class B; humidity of the test chamber: 26 ℃; and (3) testing humidity: 60% RH;
and (3) testing items: testing radiation; and (3) testing distance: 10m
The test chart is shown in the attached figure 1, and the test data table is as follows:
| No. | Frequency | Reading | Correct | Result | Limit | Margin | Height | Degree | Remark |
| (MHz) | (dBuV) | Factor(dB/m) | (dBuV/m) | (dBuV/m) | (dB) | (cm) | (deg) | ||
| 1 | 64.2900 | 41.74 | -15.74 | 26.00 | 30.00 | -4.00 | 400 | 232 | peak |
| 2 | 142.3200 | 37.96 | -12.91 | 25.05 | 30.00 | -4.95 | 400 | 205 | peak |
| 3 | 149.6100 | 40.53 | -12.61 | 27.92 | 30.00 | -2.08 | 400 | 214 | peak |
| 4 | 206.6680 | 36.11 | -13.04 | 23.07 | 30.00 | -6.93 | 400 | 246 | QP |
| 5 | 206.8500 | 41.17 | -13.04 | 28.13 | 30.00 | -1.87 | 400 | 241 | peak |
| 6 | 260.3100 | 43.09 | -12.32 | 30.77 | 37.00 | -6.23 | 400 | 67 | peak |
| 7 | 275.4300 | 43.34 | -11.59 | 31.75 | 37.00 | -5.25 | 300 | 67 | peak |
under the same test conditions, the conventional magnetic core on the market is taken for testing, the test chart is shown in the attached figure 2, and the test results are shown in the following table:
| No. | Frequeney | Reading | Correct | Rtsult | Limit | Margin | Height | Degree | Remark |
| (MHz) | (dBBuV) | Factor(dB/m) | (dBuV/m) | (dBuV/m) | (dB) | (cm) | (□) | ||
| 1 | 30.0000 | 38.26 | -6.35 | 31.91 | 30.00 | 1.91 | 100 | 157 | peak |
| 2 | 30.7450 | 35.58 | -6.86 | 28.72 | 30.00 | -1.28 | 100 | 109 | QP |
| 3 | 77.2500 | 49.61 | -18.62 | 30.99 | 30.00 | 0.99 | 200 | 199 | peak |
| 4 | 100.4700 | 45.29 | -17.41 | 27.88 | 30.00 | -2.12 | 100 | 55 | peak |
| 5 | 130.7100 | 40.77 | -14.91 | 25.86 | 30.00 | -4.14 | 100 | 96 | peak |
| 6 | 186.0600 | 42.62 | -14.09 | 28.53 | 30.00 | -1.47 | 100 | 34 | peak |
| 7 | 217.3800 | 48.68 | -14.58 | 34.10 | 30.00 | 4.10 | 100 | 47 | peak |
| 8 | 217.6700 | 43.05 | -14.59 | 28.46 | 30.00 | -1.54 | 100 | 49 | QP |
| 9 | 227.5600 | 48.52 | -14.70 | 33.82 | 30.00 | 3.82 | 100 | 29 | peak |
| 10 | 227.7200 | 45.39 | -14.70 | 30.69 | 30.00 | 0.69 | 100 | 0 | QP |
| 11 | 242.4900 | 47.03 | -14.87 | 32.16 | 37.00 | -4.84 | 100 | 67 | peak |
as can be seen from comparative tests, compared with the common magnetic core material, the magnetic core of the application has a good radiation interference resistance function, and the interference wave peak of the magnetic core does not exceed a limit (L imit) line.
The invention has the following characteristics:
1. the component purity of the main material is strictly controlled to reduce the influence of impurity components on the result;
2. through the compound addition of various additives, on one hand, the interaction of the compound additives is utilized to control the grain and grain boundary characteristics of the material, improve the grain insulation doping measure, improve the magnetic conductivity and density, break through the restriction bottleneck of loss coefficient and magnetic conductivity, and reduce the loss coefficient (η)B) Simultaneously, the magnetic permeability (ui) is improved to be more than 3400; on the other hand, a multi-element compound formula system is adopted, so that the occupied distribution of ions is adjusted, the magnetic moment and the super-exchange effect of molecules are increased, the bottleneck of low wide-temperature saturation magnetic induction (Bs) is broken through, the temperature at 25 ℃ is more than 530mT, and the temperature at 100 ℃ is more than 420 mT; finally, regulating and controlling magnetocrystalline anisotropy constant and temperature compensation point of hysteresis expansion coefficient, controlling valley point temperature of loss and improvingThe temperature characteristic of (2) realizes that high Bs is achieved at a high temperature of 100 ℃, has low hysteresis loss, has high-performance materials (magnetic cores) for improving the radio radiation interference resistance of the material, and the like, and provides a more powerful guarantee for improving the reliability of various electronic equipment systems.
In addition, the Mn-Zn ferrite of the present invention has the following typical applications and characteristics:
1. the wireless radiation interference resistance and the electromagnetic interference resistance are improved;
2. as a power inductor power transformer;
3. for automotive electronics, L CD backlights, and illumination electronics;
4. the pulse transformer is used in the field of common mode noise filters and pulse transformers for communication equipment.
The Mn-Zn ferrite prepared by the invention has the characteristics of excellent radio interference resistance and direct current superposition, and also has the characteristics of wide temperature, low loss, high saturation magnetic induction (high Bs), higher magnetic conductivity (mu i), high density and the like, and has no heterogenous phase.
The Mn-Zn ferrite of the invention is applicable to the field of magnetic cores and applicable products comprise PQ, RM, EOC, EFD, EPC, G, DS, L P, EP, EQ, ED, ER and EC rings, magnetic strips and the like.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The high-performance Mn-Zn ferrite with wireless radiation interference resistance is characterized in that the density of the Mn-Zn ferrite is more than or equal to 4.85kg/m3An initial permeability at 25 ℃ of greater than 3400; the Mn-Zn ferrite includes a host material and an additive, wherein the host material includes Fe2O3MnO and ZnO; the additive comprises Co2O3、TiO2、CaCO3、SiO2、Nb2O5、ZrO2And Er2O3The sum of the mole percentage contents of the main body material and the additive is 100%; the main body material comprises 53-54 mol% of Fe2O338-38.02 mol% of MnO and 8.0-9.0 mol% of ZnO; the additive comprises 0.01-0.15 mo1 mol% of Co2O30.01 to 0.10mo 1% of TiO20.001 to 0.05mo 1% CaCO30.001 to 0.005mo 1% SiO20.001 to 0.03mo 1% of Nb2O50.001 to 0.01mo 1% ZrO2And 0.001-0.04 mo 1% Er2O3。
2. The high-performance Mn-Zn ferrite having resistance to radio interference according to claim 1, wherein the Fe2O3Has a specific surface area of more than 4.5m2Per g, SiO therein2The content of (B) is less than or equal to 80ppm, P2O5Content of less than or equal to 10ppm, Al2O3The content of (A) is less than or equal to 30 ppm; the specific surface area of the MnO is 11-15 m2The content of K is less than or equal to 10ppm and the content of Na is less than or equal to 10 ppm; the Pb content in the ZnO is less than or equal to 10ppm, and the As content is less than or equal to 10 ppm.
3. A method for preparing a high-performance Mn-Zn ferrite having radio interference resistance according to claim 1 or 2, comprising the steps of:
(1) weighing and processing: weighing the main material and the additive according to the formula ratio, and firstly stirring the weighed main material at high speedMixing, vibration milling and crushing to obtain the bulk density of 1.3-1.5 g/cm3The host material of (1);
(2) pre-sintering treatment of main body materials: loading the main body material treated in the step (1) into a rotary kiln for presintering treatment;
(3) and (3) crushing a main material: adding the main material subjected to the pre-sintering treatment in the step (2) into a sand mill for sand milling treatment, and adding the additive weighed in the step (1) in the sand milling process to obtain mixed powder with the average particle size of 1.0-1.2 mu m;
(4) spray granulation: adding deionized water and glue into the mixed powder obtained in the step (3) to prepare slurry, and then carrying out spray granulation on the slurry to obtain granules;
(5) preparing a blank: pressing the granules prepared in the step (4) into a magnetic core blank;
(6) sintering and forming: and (5) loading the blank obtained in the step (5) into a programmed sintering kiln, adjusting the gas environment in the kiln, and performing programmed heating, heat preservation and cooling processes to obtain the high-performance Mn-Zn ferrite magnetic core with wireless radiation interference resistance.
4. The method for preparing a high-performance Mn-Zn ferrite with radio frequency interference resistance according to claim 3, wherein in the step (2), the pre-sintering temperature is 950-1050 ℃, and the pre-sintering time is 30-90 min; host material
The flow rate in the rotary kiln is 3-4 kg/min.
5. The method for preparing a high-performance Mn-Zn ferrite having radio interference resistance according to claim 3, wherein in the step (3), the sanding treatment is performed under the following process conditions: 300-350 kg/h, and the volume percentage of the materials in the sanding process is 74-78%.
6. The method for preparing a high performance Mn-Zn ferrite having immunity to radio radiation interference according to claim 3, wherein in the step (4), the particlesThe characteristic parameters of the granules are as follows: particle size distribution of 100-300 μm, and bulk density of 1.3-1.5 g/cm3The weight percentage of the water is 0.15-0.25%, the weight percentage of the glue is 8 per mill, and the repose angle is less than or equal to 30 degrees.
7. The method for preparing a high-performance Mn-Zn ferrite having resistance to radio interference according to claim 3, wherein in the step (6), the process conditions of the temperature rise are as follows: firstly, in the atmosphere, raising the temperature from room temperature to 700 ℃ at a heating rate of 0.5-2.0 ℃/min, then adjusting the oxygen partial pressure to be less than 1%, firstly raising the temperature from 700 ℃ to 1200 ℃ at a heating rate of 0.5-2.0 ℃/min, and then raising the temperature from 1200 ℃ to 1250-1340 ℃ at a heating rate of 3-10 ℃/min.
8. The method for preparing a high-performance Mn-Zn ferrite having radio frequency interference resistance according to claim 3, wherein in the step (6), the process conditions of the heat preservation are as follows: 5-7% of oxygen partial pressure and 1250-1340 ℃ of heat preservation temperature,
the heat preservation time is 3.5-6.5 h.
9. The method for preparing a high-performance Mn-Zn ferrite with radio frequency interference resistance according to claim 3, wherein in the step (6), the process conditions of temperature reduction are as follows: the oxygen partial pressure is balanced, the temperature is reduced from 1250 to 1340 ℃ to 1000 ℃ at the cooling rate of 0.5 to 2.0 ℃/min, and then the temperature is reduced from 1000 ℃ to the room temperature at the cooling rate of 3.0 to 5.0 ℃/min.
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| CN103382101A (en) * | 2013-06-26 | 2013-11-06 | 蚌埠市高华电子有限公司 | Rare-earth soft-magnetic ferrite with high magnetic permeability and preparation method thereof |
| CN104387050A (en) * | 2014-11-04 | 2015-03-04 | 横店集团东磁股份有限公司 | High-magnetic-permeability manganese-zinc series ferrite and preparation method thereof |
| CN104446423A (en) * | 2014-11-13 | 2015-03-25 | 常熟市三佳磁业有限公司 | Material for high-superposition manganese-zinc ferrite magnetic core and preparation method thereof |
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| JPS55130824A (en) * | 1979-03-27 | 1980-10-11 | Tohoku Metal Ind Ltd | Oxide magnetic material |
| CN103382101A (en) * | 2013-06-26 | 2013-11-06 | 蚌埠市高华电子有限公司 | Rare-earth soft-magnetic ferrite with high magnetic permeability and preparation method thereof |
| CN104387050A (en) * | 2014-11-04 | 2015-03-04 | 横店集团东磁股份有限公司 | High-magnetic-permeability manganese-zinc series ferrite and preparation method thereof |
| CN104446423A (en) * | 2014-11-13 | 2015-03-25 | 常熟市三佳磁业有限公司 | Material for high-superposition manganese-zinc ferrite magnetic core and preparation method thereof |
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