CN102682946B - A kind of MnZn ferrite core and manufacture method having double grading concurrently - Google Patents
A kind of MnZn ferrite core and manufacture method having double grading concurrently Download PDFInfo
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Abstract
The invention discloses a kind of the MnZn ferrite core and the manufacture method that have double grading concurrently.Magnetic core is become to be grouped into auxiliary by principal component, principal component consist of Fe
2o
3: 54 ~ 56mol%, ZnO:5 ~ 10mol%, surplus is manganese oxide, and three's sum counts 100mol%; Auxiliary composition comprises the first auxiliary material, the second auxiliary material, the 3rd auxiliary material and optional 4th auxiliary material, and wherein, the first auxiliary material is the oxide of Co, and the second auxiliary material is Ni
2o
3, NiO or Li
2cO
3in one; 3rd auxiliary material CaCO
3and Nb
2o
5; 4th auxiliary material is selected from SiO
2, V
2o
5, ZrO
2.MnZn ferrite core material of the present invention, overcome the deficiency that conventional MnZn power ferrite material cannot take into account multiple characteristic, have high temperature height Bs and wide-temperature and low-consumption double grading concurrently, this magnetic core is from unit volume loss Pcv(100kHz, the 200mT of 25 DEG C ~ 120 DEG C) be all less than 350kW/m
3, near 90 DEG C, lowest loss is lower than 300kW/m
3, and also there is the saturation flux density up to 450mT 100 DEG C time.
Description
Technical field
The present invention relates to a kind of MnZn soft magnetic ferrite material and manufacture method, particularly a kind of MnZn soft-magnetic ferrite core and manufacture method having high temperature height Bs and wide-temperature and low-consumption double grading concurrently.
Background technology
Soft magnetic ferrite is a kind of magnetic material that kind is maximum, most widely used, consumption is maximum, is the important foundation functional material of electronics and information industry.Prevailing in soft magnetic ferrite is produced and used is MnZn ferrite, and the ferritic output of MnZn accounts for 70% of soft magnetic ferrite total output, is field of greatest concern and the most active in current soft magnetic material.In recent years, the development of MnZn Ferrite Material is improved the transverse direction expansion turning to many index simultaneously to improve by the depth of single performance.Such as power ferrite material, except reducing except the loss of material further, also requires to reduce the wastage in more wide temperature range, or more reduces the wastage under broadband, or higher saturation flux density etc.
Existing multinomial technology laterally can expand the ferritic performance of MnZn, but is only the transverse direction expansion of a few performance mostly.
In method disclosed in CN1287985A, by adding the cobalt oxide of accessory ingredient, make magnetic ferrites materials in the minimum value of the power loss of the temperature province Inner of 20 ~ 100 DEG C at 400kW/m
3below, and in the difference of the maxima and minima of the power loss of the temperature province of 20 ~ 100 DEG C at 150kW/m
3below.Achieve low-loss to expand in the transverse direction of wide temperature range, but and the unrealized performance having high Bs concurrently.
And for example in technical scheme disclosed in CN1404076A, by adding the NiO up to 3 ~ 6mol% in a large number, make magnetic core the saturation flux density of 100 DEG C up to more than 450mT, but low loss characteristic sacrifice is too many, the loss under 100kHz, 200mT, 100 DEG C of conditions is up to 550 ~ 900kW/m
3.
For another example in technical scheme disclosed in CN1649039A, by preparing the shaping powder of specific specific area, reach the object reducing power loss, but also only achieve low-loss and high Bs, its normal temperature loss is up to 600kW/m
3above, and the performance of unrealized wide-temperature and low-consumption.
In existing MnZn ferrite core material manufacture process, in the temperature-fall period after sintering, generally adopt and keep equilibrium oxygen partial pres-sure method to process, to ensure product quality and performances.According to equilibrium oxygen partial pres-sure computing formula, oxygen content when 1100 DEG C can be 0.01 ~ 0.6%, and in order to keep the balanced atmosphere of temperature descending section, oxygen content needs slowly to reduce.But the scope below 0.6% accurately controls oxygen content, there is strict requirement to furnace equipment and technical staff, be unfavorable for the stable operation of producing in batches.
Summary of the invention
The object of the present invention is to provide a kind of novel MnZn ferrite core material.
Another object of the present invention is the manufacture method providing above-mentioned material.
The technical solution used in the present invention is:
A kind of MnZn ferrite core, is become to be grouped into auxiliary by principal component, principal component consist of Fe
2o
3: 54 ~ 56 mol%, ZnO:5 ~ 10 mol%, surplus is manganese oxide, and three's sum counts 100 mol%; Auxiliary composition comprises the first auxiliary material, the second auxiliary material, the 3rd auxiliary material and the 4th auxiliary material, and wherein, the first auxiliary material is the oxide of Co, and it is 2500 ~ 4500ppm at ferrite magnetic content in the heart; The Ni of the second auxiliary material to be addition be 4300 ~ 8500 ppm
2o
3, addition be the NiO of 4000 ~ 8000 ppm or addition is 1000 ~ 2500 ppm Li
2cO
3in one; The CaCO of the 3rd auxiliary material to be addition be 100 ~ 500 ppm
3with the Nb that addition is 100 ~ 500 ppm
2o
5; 4th auxiliary material is selected from SiO
2, V
2o
5, ZrO
2, its addition is 0 ~ 500 ppm.
The composition of principal component is preferably Fe
2o
3: 54.5 ~ 55.5 mol%, ZnO:6 ~ 9 mol%, surplus is manganese oxide, and three's sum counts 100 mol%.
The Co of the first auxiliary material to be addition be 3000 ~ 4500 ppm
2o
3, the CoO of 2500 ~ 4000 ppm or the Co of 2500 ~ 4500 ppm
3o
4.
The manufacture method of above-mentioned MnZn ferrite core, comprises the steps:,
1) according to the composition of MnZn ferrite core, take principal component, or at least one in principal component and the first auxiliary material and the second auxiliary material, add water stirring, be ground, spraying dry obtains powder, and gained powder is warming up to 900 DEG C ~ 1050 DEG C with the programming rate of 150 ~ 200 DEG C/h, be incubated 1 ~ 3 hour, Preburning material of coming out of the stove to obtain of lowering the temperature;
2) by Preburning material, not yet add or do not add completely auxiliary material, water, dispersant, defoamer mixing, regrind is 0.8 ~ 1.2 μm to powder particle size, adds organic bond, mixing, spraying dry obtains the particulate material for being shaped;
3) aqueous solution of particulate material and organic bond is carried out batch mixing, the moisture content controlling particulate material is 0.2 ~ 0.4%, is pressed into green compact;
4) by green sintering, grinding, obtains MnZn ferrite core.
Preferably, the sintering temperature of green compact is 1200 DEG C ~ 1350 DEG C.
Preferably, adopt secondary reduction sintering process during green sintering, temperature-fall period keeps equilibrium oxygen partial pres-sure.
Preferably, the computing formula of equilibrium oxygen partial pres-sure is lg (P (O
2))=a-b/T, wherein, a value 4 ~ 15, b value 10000 ~ 19000, T is absolute temperature.
Preferably, comprise respectively and be incubated platform at least one times in the temperature-rise period of secondary reduction sintering and temperature-fall period, and be cooled to 1100 DEG C and be directly filled with nitrogen later.
Preferably, the MnZn ferrite sintered adopts passing through type grinder grinding, and cleans with ultrasonic cleaning apparatus.
Preferably, passing through type grinder selects the emery wheel of more than 300 orders.
The invention has the beneficial effects as follows:
MnZn ferrite core material of the present invention, overcome the deficiency that conventional MnZn power ferrite material cannot take into account multiple characteristic, have high temperature height Bs and wide-temperature and low-consumption double grading concurrently, this magnetic core is from unit volume loss Pcv(100kHz, the 200mT of 25 DEG C ~ 120 DEG C) be all less than 350kW/m
3, near 90 DEG C, lowest loss is lower than 300kW/m
3, and also there is the saturation flux density up to 450mT 100 DEG C time.This magnetic core, relative to ordinary power ferrite core, has the double grading of high temperature height Bs and wide-temperature and low-consumption concurrently, and be the most all-round in the heart one of existing ferrite magnetic, properties of product are better than import hit product, can be widely used in various occasion.
The effect of the first auxiliary material of the present invention is and Fe
2+ionic association compensates the magnetocrystalline constant K of conventional manganese-zinc ferrite
1, realize K
1value levels off to 0 at wider temperature range Inner, thus realizes the performance of wide-temperature and low-consumption.When first auxiliary material addition is lower than limited range of the present invention, cannot realize performance index of the present invention, the loss particularly more than less than 60 DEG C and 100 DEG C can enlarge markedly; When first auxiliary material addition exceedes limited range of the present invention, loss ~ temperature curve will be made too smooth, and cause overall losses level to increase, the loss near 90 DEG C cannot reach lower than 300kW/m
3level.
The effect of the second auxiliary material of the present invention is to improve magnetic core sintered density, and can improve two peak temperatures, can increase Fe in principal component
2o
3content, thus the saturation flux density Bs improving magnetic core.When second auxiliary material addition is lower than limited range of the present invention, two peak temperatures cannot be made to be increased to enough scopes, high temperature consumption is difficult to reduce, if now reduce Fe
2o
3content, to improve the reduction that two peak temperatures realize high temperature consumption, will cause the synchronous reduction of saturation flux density Bs; When second auxiliary material addition exceeds limited range of the present invention, a large amount of Ni ferrite of formation is solid-solution in magnetic core, core loss is enlarged markedly.As described in CN1404076A, wherein NiO content is 3-6 mol%, is scaled part by weight and is about 19000 ~ 37000 ppm, its nickel oxide addition super limited range of the present invention far away, therefore core loss enlarges markedly.
The present invention passes through the interpolation scope of control first auxiliary material and the second auxiliary material, achieves the double grading that MnZn ferrite core has high Bs and wide-temperature and low-consumption concurrently.
The effect of the 3rd, the 4th auxiliary material of the present invention is the power loss reducing magnetic core.
The inventive method is arranged on the basis of insulation platform at temperature descending section, directly can be filled with nitrogen after being cooled to 1100 DEG C, and reduce kiln and regulate difficulty, the product quality obtained more ensures, the properties of product between batch are more stable.
Passing through type grinder selects the emery wheel of more than 300 orders, magnetic core abradant surface can be made level and smooth, reduce stress remaining, avoids leakage inductance increase, core loss increase.
Accompanying drawing explanation
Fig. 1 is the loss temperature curve of different core material.
Embodiment
A kind of MnZn ferrite core, is become to be grouped into auxiliary by principal component, principal component consist of Fe
2o
3: 54 ~ 56 mol%, ZnO:5 ~ 10 mol%, surplus is manganese oxide, and three's sum counts 100 mol%; Auxiliary composition comprises the first auxiliary material, the second auxiliary material, the 3rd auxiliary material and the 4th auxiliary material, and wherein, the first auxiliary material is the oxide of Co, and it is 2500 ~ 4500ppm at ferrite magnetic content in the heart; The Ni of the second auxiliary material to be addition be 4300 ~ 8500 ppm
2o
3, addition be the NiO of 4000 ~ 8000 ppm or addition is 1000 ~ 2500 ppm Li
2cO
3in one; The CaCO of the 3rd auxiliary material to be addition be 100 ~ 500 ppm
3with the Nb that addition is 100 ~ 500 ppm
2o
5; 4th auxiliary material is selected from SiO
2, V
2o
5, ZrO
2, its addition is 0 ~ 500 ppm.
The composition of principal component is preferably Fe
2o
3: 54.5 ~ 55.5 mol%, ZnO:6 ~ 9 mol%, surplus is manganese oxide, and three's sum counts 100 mol%.
The Co of the first auxiliary material to be addition be 3000 ~ 4500 ppm
2o
3, the CoO of 2500 ~ 4000 ppm or the Co of 2500 ~ 4500 ppm
3o
4.
The manufacture method of above-mentioned MnZn ferrite core, comprises the steps:,
5) according to the composition of MnZn ferrite core, take principal component, or at least one in principal component and the first auxiliary material and the second auxiliary material, add water stirring, be ground, spraying dry obtains powder, and gained powder is warming up to 900 DEG C ~ 1050 DEG C with the programming rate of 150 ~ 200 DEG C/h, be incubated 1 ~ 3 hour, Preburning material of coming out of the stove to obtain of lowering the temperature;
6) by Preburning material, not yet add or do not add completely auxiliary material, water, dispersant, defoamer mixing, regrind is 0.8 ~ 1.2 μm to powder particle size, adds organic bond, mixing, spraying dry obtains the particulate material for being shaped;
7) aqueous solution of particulate material and organic bond is carried out batch mixing, the moisture content controlling particulate material is 0.2 ~ 0.4%, is pressed into green compact;
8) by green sintering, grinding, obtains MnZn ferrite core.
Preferably, the sintering temperature of green compact is 1200 DEG C ~ 1350 DEG C.
Preferably, adopt secondary reduction sintering process during green sintering, temperature-fall period keeps equilibrium oxygen partial pres-sure.
Preferably, the computing formula of equilibrium oxygen partial pres-sure is lg (P (O
2))=a-b/T, wherein, a value 4 ~ 15, b value 10000 ~ 19000, T is absolute temperature.
Preferably, comprise respectively and be incubated platform at least one times in the temperature-rise period of secondary reduction sintering and temperature-fall period, and be cooled to 1100 DEG C and be directly filled with nitrogen later.
Preferably, the MnZn ferrite sintered adopts passing through type grinder grinding, and cleans with ultrasonic cleaning apparatus.
Preferably, passing through type grinder selects the emery wheel of more than 300 orders.
Below in conjunction with embodiment, further illustrate the present invention.
example 1 ~ 8
1) commercially available Fe is adopted
2o
3, Mn
3o
4, ZnO as principal component, according to the amount shown in table 1 by Fe
2o
3, MnO(raw material is Mn
3o
4), ZnO and based on a certain proportion of Ni of principal component
2o
3be placed in sand mill, add the water of the 90wt% of described powder total weight in the aforementioned powder taken, also ground and mixed is even in stirring; Pre-burning 2h at being warming up to 950 DEG C with the speed of 180 DEG C/h after spraying dry;
2) based on the total weight of the powder after pre-burning, additive is added: the Co of 3500ppm
2o
3, 30ppm SiO
2, 300ppm CaCO
3, 300ppm Nb
2o
5and the deionized water of 65wt%, the dispersant of 1.2wt%, the defoamer of 0.8wt% carry out regrind together, being ground to particle mean size is 1.0 ± 0.2mm;
3) based on the total weight of the powder after ball milling, in this powder, add the poly-vinyl alcohol solution of 7.7wt%, mix granulation, adopt 20 tons of dry powder press that particulate material is pressed into green compact sample;
4) finally sintering under the sintering temperature of 1300 DEG C, and be incubated 8 hours at a sintering temperature, be cooled to 180 DEG C and come out of the stove, soaking zone partial pressure of oxygen 5% under balanced atmosphere, temperature-fall period adopts equilibrium oxygen partial pres-sure.
Normal temperature inductance L under adopting HP4294A electric impedance analyzer (Agilent Technology 4294A) and special fixture (Agilent Technology 16047E) to measure sample magnet ring 10kHz feeble field, calculates the initial permeability of material; With SY-8258 type B-H tester at 50Hz, 1200A/m, the Bs testing sample magnet ring at 100 DEG C; Test the power loss of sample magnet ring under 100kHz, 200mT, condition of different temperatures with Model 2335 Watt Meter, result is listed in table 1.
In example shown in table 1,1 ~ 4 is the embodiment of the present invention, and 5 ~ 8 is comparative example.
Data from table 1:
1) embodiment 1 ~ 4 principal component is all within limited range of the present invention, and magnetic core performance index are completely up to standard.
2) comparative example 5 ~ 6 for ZnO content exceeds limited range of the present invention, wherein the ZnO content of comparative example 5 exceeds the present invention and limits lower limit, and power loss is higher; The ZnO content of comparative example 6 exceeds the present invention and limits the upper limit, and the temperature stability of Bs worsens, and causes the Bs of 100 DEG C obviously on the low side.
3) comparative example 7 ~ 8 is Fe
2o
3content exceeds limited range of the present invention, wherein the Fe of comparative example 7
2o
3content exceeds the present invention and limits the upper limit, power loss severe exacerbation; The Fe of comparative example 8
2o
3content exceeds the present invention and limits lower limit, causes the Bs of 100 DEG C on the low side.
The product of the product of example 3 and TDK company is carried out performance comparison, records its loss temperature curve.Result of the test as shown in Figure 1.As seen from the figure, properties of product of the present invention are obviously better than the product of TDK company.
example 9 ~ 21
1) with Fe
2o
354.9mol%, MnO 37.1mol%, ZnO 8.0mol% is that principal component formula takes Fe
2o
3, Mn
3o
4, ZnO raw material are placed in sand mill, add the water of the first auxiliary material or the second auxiliary material or the first auxiliary material and the second auxiliary material and the 90wt% based on described powder total weight in the above-mentioned powder taken, and stir and ground and mixed is even, auxiliary material addition is as shown in table 2; Pre-burning 1.5h at being warming up to 1000 DEG C with the speed of 200 DEG C/h after spraying dry;
2) based on the total weight of the powder after pre-burning, remaining auxiliary material is added according to the addition shown in table 2, add the deionized water of 67wt% again, the dispersant of 1.1wt%, the defoamer of 0.9wt% carry out regrind together, being ground to particle mean size is 1.0 ± 0.2mm;
3) based on the total weight of the powder after ball milling, in this powder, add the poly-vinyl alcohol solution of 8.2wt%, mix granulation, adopt 40 tons of dry powder press that particulate material is pressed into green compact sample;
4) finally sinter under the sintering temperature of 1330 DEG C, and be incubated 6 hours at a sintering temperature, soaking zone partial pressure of oxygen 7.5%, is cooled to after 1100 DEG C, is directly filled with nitrogen protection under balanced atmosphere, to be cooledly comes out of the stove to 180 DEG C.
Normal temperature inductance L under adopting HP4294A electric impedance analyzer (Agilent Technology 4294A) and special fixture (Agilent Technology 16047E) to measure sample magnet ring 10kHz feeble field, calculates the initial permeability of material; With SY-8258 type B-H tester at 50Hz, 1200A/m, the Bs testing sample magnet ring at 100 DEG C; Test the power loss of sample magnet ring under 100kHz, 200mT, condition of different temperatures with Model 2335 Watt Meter, the results are shown in Table 2.
In example shown in table 2,9 ~ 17 is the embodiment of the present invention, and 18 ~ 21 is comparative example.
Data from table 2:
1) embodiment 11 ~ 17 doping is all within limited range of the present invention, and magnetic core performance index are completely up to standard.
2) comparative example 18-21 doping exceeds limited range of the present invention: wherein the first auxiliary material Co of comparative example 18
2o
3the lower limit that addition limits lower than the present invention, K
1value undercompensation, fails to realize wide-temperature and low-consumption characteristic; The lower limit that second auxiliary material NiO addition of comparative example 19 limits lower than the present invention, two peak temperatures are significantly on the low side, and high temperature consumption worsens; Second auxiliary material Li of comparative example 20
2cO
3addition exceeds the upper limit that the present invention limits, and two peak temperatures are significantly higher, and normal temperature loss worsens; 3rd auxiliary material CaCO of comparative example 20
3, Nb
2o
5the lower limit that addition limits lower than the present invention, overall losses is higher.
Describe the present invention by preferred embodiment above, but, should be appreciated that these preferred embodiments are not intended to limit protection scope of the present invention.On the contrary, any amendment done within purport of the present invention and principle, equivalent replacement, improvement etc., all should be included within protection scope of the present invention of being defined by the following claims.
Claims (10)
1. a MnZn ferrite core, is become to be grouped into auxiliary by principal component, principal component consist of Fe
2o
3: 54 ~ 56 mol%, ZnO:5 ~ 10 mol%, surplus is manganese oxide, and three's sum counts 100 mol%; Auxiliary composition comprises the first auxiliary material, the second auxiliary material, the 3rd auxiliary material and the 4th auxiliary material, and wherein, the first auxiliary material is the oxide of Co, and it is 2500 ~ 4500ppm at ferrite magnetic content in the heart; The Ni of the second auxiliary material to be addition be 4300 ~ 8500 ppm
2o
3, addition is one in the NiO of 4000 ~ 8000 ppm; The CaCO of the 3rd auxiliary material to be addition be 100 ~ 500 ppm
3with the Nb that addition is 100 ~ 500 ppm
2o
5; 4th auxiliary material is selected from SiO
2, V
2o
5, ZrO
2, its addition is 0 ~ 500 ppm, ppm is weight ratio.
2. a kind of MnZn ferrite core according to claim 1, is characterized in that: principal component consist of Fe
2o
3: 54.5 ~ 55.5 mol%, ZnO:6 ~ 9 mol%, surplus is manganese oxide, and three's sum counts 100 mol%.
3. a kind of MnZn ferrite core according to claim 1 and 2, is characterized in that: the Co of the first auxiliary material to be addition be 3000 ~ 4500 ppm
2o
3, the CoO of 2500 ~ 4000 ppm or the Co of 2500 ~ 4500 ppm
3o
4, ppm is weight ratio.
4. the manufacture method of MnZn ferrite core described in claims 1 to 3 any one, comprises the steps:
1) according to the composition of MnZn ferrite core, take principal component, or at least one in principal component and the first auxiliary material and the second auxiliary material, add water stirring, be ground, spraying dry obtains powder, and gained powder is warming up to 900 DEG C ~ 1050 DEG C with the programming rate of 150 ~ 200 DEG C/h, be incubated 1 ~ 3 hour, Preburning material of coming out of the stove to obtain of lowering the temperature;
2) by Preburning material, not yet add or do not add completely auxiliary material, water, dispersant, defoamer mixing, regrind is 0.8 ~ 1.2 μm to powder particle size, adds organic bond, mixing, spraying dry obtains the particulate material for being shaped;
3) aqueous solution of particulate material and organic bond is carried out batch mixing, the moisture content controlling particulate material is 0.2 ~ 0.4%, is pressed into green compact;
4) by green sintering, grinding, obtains MnZn ferrite core.
5. method according to claim 4, is characterized in that: the sintering temperature of green compact is 1200 DEG C ~ 1350 DEG C.
6. method according to claim 5, is characterized in that: adopt secondary reduction sintering process during green sintering, and temperature-fall period keeps equilibrium oxygen partial pres-sure.
7. method according to claim 6, is characterized in that: the computing formula of equilibrium oxygen partial pres-sure is lg (P (O
2))=a-b/T, wherein, a value 4 ~ 15, b value 10000 ~ 19000, T is absolute temperature.
8. method according to claim 7, is characterized in that: comprise respectively and be incubated platform at least one times in the temperature-rise period of secondary reduction sintering and temperature-fall period, and is cooled to 1100 DEG C and is directly filled with nitrogen later.
9. the method according to claim 4 ~ 8 any one, is characterized in that: the MnZn ferrite sintered adopts passing through type grinder grinding, and cleans with ultrasonic cleaning apparatus.
10. method according to claim 9, is characterized in that: passing through type grinder selects the emery wheel of more than 300 orders.
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| CN103887055A (en) * | 2013-10-20 | 2014-06-25 | 山东嘉诺电子有限公司 | High-inductance polishing method of small soft magnetic-ferrite magnetic core |
| CN103708816B (en) * | 2013-12-12 | 2015-09-02 | 桐乡市耀润电子有限公司 | The high curie point High Initial Permeability MnZn Ferrite Materials at two 25 DEG C, peaks and preparation method thereof |
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| CN104556994B (en) * | 2014-12-19 | 2017-03-29 | 江门安磁电子有限公司 | The MnZn ferrite material without Ni and its manufacture method for 20～140 DEG C |
| CN104591712B (en) * | 2014-12-19 | 2017-04-19 | 江门安磁电子有限公司 | Low-loss manganese zinc ferrite material for temperature of 20 DEG C below zero to 140 DEG C and manufacturing method thereof |
| CN105645943A (en) * | 2015-05-25 | 2016-06-08 | 泰州茂翔电子器材有限公司 | High Bs soft magnetic ferrite material |
| CN107555984B (en) * | 2017-10-10 | 2018-09-21 | 浙江大学 | A kind of ferritic sintering process control climate methods of high frequency wide-temperature and low-consumption MnZn |
| CN108275992B (en) * | 2018-01-18 | 2020-11-03 | 常熟市三佳磁业有限公司 | Wide-temperature low-power-consumption high-magnetic-permeability manganese-zinc ferrite material and preparation method thereof |
| CN111233451A (en) * | 2018-11-28 | 2020-06-05 | 泰州茂翔电子器材有限公司 | High Bs, high frequency and low loss magnetic material |
| CN111848148B (en) * | 2020-08-03 | 2021-06-18 | 广东泛瑞新材料有限公司 | High Bs nickel-zinc ferrite and preparation method thereof |
| CN112552037B (en) * | 2020-12-11 | 2024-05-24 | 江门安磁电子有限公司 | Low-loss ferrite material and preparation method thereof |
| CN115745588B (en) * | 2022-09-23 | 2023-11-03 | 西南应用磁学研究所(中国电子科技集团公司第九研究所) | High-performance factor manganese zinc ferrite material and preparation method thereof |
| CN115650718A (en) * | 2022-11-18 | 2023-01-31 | 浙江工业大学 | Manganese-zinc ferrite material with ultra-wide temperature, low power consumption and magnetic conductivity and temperature stability and preparation method thereof |
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