A high-curie-temperature high-frequency high-impedance manganese-zinc ferrite material and a preparation method thereof

Abstract

This invention discloses a high Curie temperature, high frequency, and high impedance manganese-zinc ferrite material and its preparation method, belonging to the technical field of soft magnetic ferrite materials. The manganese-zinc ferrite material consists of a main component and secondary components. The main component, calculated as oxides, comprises Fe2O3: 48.5–49.9 mol%, ZnO: 18.5–21.5 mol%, NiO: 0.5–2.0 mol%, with the remainder being MnO. The secondary components, by weight of the main component, include at least four of the following: Co2O3: 0.05–0.30 wt%, SiO2: 0.005–0.01 wt%, CaCO3: 0.02–0.05 wt%, ZrO2: 0.01–0.02 wt%, Bi2O3: 0.01–0.03 wt%, and V2O5: 0.01–0.05 wt%, mixed in any proportion. The resulting manganese-zinc ferrite material exhibits excellent properties such as high impedance.

Description

Technical Field

[0001] This invention belongs to the technical field of soft magnetic ferrite materials, specifically relating to a high Curie temperature, high frequency, high impedance manganese-zinc ferrite material and its preparation method. Background Technology

[0002] Electromagnetic interference (EMI) exists within electronic information products due to the conduction and radiation of electromagnetic waves. This EMI poses threats to power grids, the public environment, information security, and human health. With the widespread application of electronic information products in new energy vehicles, industrial control, and communication equipment, the operating environment temperature is increasing. Simultaneously, as the power density of electronic information products increases and their size decreases, their heat dissipation space shrinks, leading to increasingly stringent temperature requirements for electronic components. This places higher demands on the magnetic permeability and Curie temperature of ferrite materials used to combat EMI.

[0003] Ferrite materials, due to their high initial permeability and high impedance, are widely used in electromagnetic interference (EMI) suppression in electronic information products. NiZn ferrites, with their excellent frequency performance, are widely used in EMI suppression at high frequencies above 10MHz, while MnZn ferrites are generally used in low-frequency frequencies below 10MHz. However, NiZn ferrite materials have difficulty achieving a permeability above 2500, have relatively low Curie temperature and saturation flux density, and are expensive. With the development of manganese-zinc ferrite material technology, iron-depleted manganese-zinc ferrite materials have begun to replace some NiZn ferrite materials in recent years for EMI suppression at high frequencies above 10MHz.

[0004] Chinese patent CN 111233452 A discloses a high-frequency, high-impedance iron-poor manganese-zinc ferrite. Its materials include the following main components: Fe₂O₃: 47.8–49.8 mol%, MnO: 31–36 mol%, ZnO: 15–18.5 mol%, Co₂O₃: 0.7–2 mol%, and additives: SiO₂: 10–100 ppm, CaCO₃: 200–1000 ppm, Bi₂O₃: 100–300 ppm, ZrO₂: 100–300 ppm, and TiO₂: 100–600 ppm. Its impedance at 25 MHz and 100 MHz is above 50 Ω and 100 Ω, respectively, and its Curie temperature is above 160 °C, but its permeability is below 2500. Chinese patent CN 111892395 A discloses a high-frequency, high-impedance manganese-zinc ferrite material and its preparation method. The material comprises the main components Fe₂O₃: 48–49.7 mol%, MnO: 29–33 mol%, ZnO: 19–21 mol%, and Co₂O₃: 0.03–0.08 mol%. Additives include at least three of the following: Nb₂O₅: 0.01–0.05 wt%, CaCO₃: 0.02–0.05 wt%, SnO₂: 0.01–0.08 wt%, Bi₂O₃: 0.01–0.06 wt%, and MoO₃: 0.01–0.05 wt%. Its permeability reaches approximately 3000 Ω, and its impedance is above 50 Ω and around 125 Ω at 25 MHz and 100 MHz, respectively, but its Curie temperature is between 130°C and 140°C. Typically, the Curie temperature decreases as the permeability of ferrite materials increases, and it is difficult to simultaneously increase both permeability and Curie temperature. Existing high-frequency, high-impedance manganese-zinc ferrite materials struggle to meet the requirements of permeability above 3000 and Curie temperature above 150℃. Summary of the Invention

[0005] The purpose of this invention is to provide a high Curie temperature, high frequency, high impedance manganese zinc ferrite material and its preparation method, so as to solve the technical problem that manganese zinc ferrite materials cannot simultaneously improve magnetic permeability and Curie temperature.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component, calculated as oxides, consists of Fe2O3: 48.5–49.9 mol%, ZnO: 18.5–21.5 mol%, NiO: 0.5–2.0 mol%, with the remainder being MnO. The secondary components, by weight of the main component, include at least four of the following in any proportion: Co2O3: 0.05–0.30 wt%, SiO2: 0.005–0.01 wt%, CaCO3: 0.02–0.05 wt%, ZrO2: 0.01–0.02 wt%, Bi2O3: 0.01–0.03 wt%, and V2O5: 0.01–0.05 wt%.

[0008] Preferably, the main components, calculated as oxides, consist of Fe2O3: 49–49.8 mol%, ZnO: 19–20 mol%, NiO: 0.75–2.0 mol%, with the remainder being MnO.

[0009] This invention also provides a method for preparing a high Curie temperature, high frequency, high impedance manganese-zinc ferrite material, comprising the following steps:

[0010] 1) Ingredients: Weigh the main components according to the proportions and add deionized water to the sand mill to mix and grind. Then dry the slurry after mixing and grinding in an oven.

[0011] 2) Pre-calcination: The dried mixed sand powder is pre-calcined in a muffle furnace to obtain pre-calcined material;

[0012] 3) Sand milling: Add the by-products to the pre-calcined material in proportion and perform secondary sand milling in a sand mill;

[0013] 4) Granulation: After drying the slurry after secondary sand milling in an oven, PVA solution is added for granulation;

[0014] 5) Molding: The granulated particles are pressed to obtain a T25*15*7.5 blank magnetic ring;

[0015] 6) Sintering: The blank magnetic ring is sintered in a bell furnace, and then kept warm and cooled.

[0016] Preferably, the grinding time in step 1) is 20 min to 60 min.

[0017] Preferably, in step 2), the preheating temperature is 800℃~950℃, and the temperature is maintained for 1~3 hours.

[0018] Preferably, in step 3), the particle size D50 of the powder after sand milling is 1.0μm to 1.5μm, and the sand milling time is 40 to 90 min.

[0019] Preferably, in step 4), the amount of PVA solution used is 8-10 wt% of the dry powder weight.

[0020] Preferably, the compression density in step 5) is 2.9–3.2 g·cm³. -3 .

[0021] Preferably, the sintering temperature in step 6) is 1285~1325℃; the holding time is 3~5h; the oxygen concentration during holding is 1.0~3.5%; the cooling process is controlled by balancing the oxygen concentration according to the formula: lgPO2=a / T+b, where a is between -14500 and -10000, b is between 5 and 8, and T is the absolute temperature K.

[0022] More preferably, the sintering temperature in step 6) is 1285–1310 °C.

[0023] The beneficial effects of this invention are:

[0024] The manganese-zinc ferrite material prepared in this invention can achieve excellent characteristics such as magnetic permeability (μi) ≥3000 and Curie temperature (Tc) ≥155℃ at 25℃, and high impedance in the range of 1MHz to 100MHz, which can meet the high requirements of high frequency EMI in circuits under high temperature environments such as communication equipment, new energy vehicles, and industrial equipment.

[0025] The high Curie temperature, high frequency, and high impedance manganese-zinc ferrite of the present invention, in order to obtain a higher magnetic permeability and a higher Curie temperature Tc, since the Curie temperature of NiFe2O4 ferrite is 863K, which is much higher than that of MnFe2O4 ferrite (573K) and ZnFe2O4 ferrite (9.5K), can be increased by replacing a small amount of NiO in the main component.

[0026] The magnetic permeability of ferrite is inversely proportional to its anisotropy constant. Since CoFe2O4 ferrite has a high positive anisotropy constant, by adding an appropriate amount of Co2O3 to the additives, the negative anisotropy of MnFe2O4 can be offset, so that the overall anisotropy constant K of the material tends to a minimum value, and high magnetic permeability can be obtained.

[0027] The impedance at high frequencies is closely related to the grain size and resistivity inside the ferrite body after sintering. Generally, materials with fine and uniform grains and high resistivity will have high impedance at high frequencies. By refining the particle size through sand milling, combined with the addition of some low-melting-point V2O5, Bi2O3, and SiO2, CaCO3, materials with finer grains and higher grain boundary resistivity can be obtained by sintering at lower temperatures.

[0028] To achieve sintering at a lower temperature, some low-melting-point substances are added, which pose a risk of grain growth during sintering. To prevent this risk, ZrO2 is added, which can refine the grains and prevent abnormal grain growth.

[0029] This invention, through the selection of main components, combined with the optimization of trace element combinations and sintering processes, produces manganese-zinc ferrite materials with an initial permeability of up to 3000, a Curie temperature above 155℃, a 25MHz impedance (diameter 0.5mm * length 165mm, 1Ts) above 55Ω, and a 100MHz impedance above 130Ω. It exhibits excellent properties of high permeability, high Curie temperature, and high high-frequency impedance. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component is Fe2O3: 49.0 mol%, MnO: 30.5 mol%, ZnO: 19.5 mol%, NiO: 1.0 mol%. The secondary components are Co2O3: 0.1 wt%, SiO2: 0.005 wt%, CaCO3: 0.05 wt%, ZrO2: 0.01 wt%, and Bi2O3: 0.01 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, MnO, ZnO and NiO.

[0033] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0034] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and NiO according to the ratio and grind them in a sand mill for 20 minutes. Then dry the mixed and ground slurry in an oven.

[0035] 2) Pre-firing: The mixed powder is pre-firing at 900℃ for 3 hours to obtain pre-fired material;

[0036] 3) Sand milling: The by-products are added to the pre-calcined material for secondary mixing. The sand milling time is 60 min and the particle size D50 is 1.04 μm.

[0037] 4) Granulation: After drying the slurry after sand milling, add 10wt% PVA solution for granulation;

[0038] 5) Molding: The granulated particles are pressed to a raw density of 3.05 g·cm³. -3 This yields a T25*15*7.5 blank magnetic ring;

[0039] 6) Sintering: The blank magnetic ring is placed in a bell furnace for sintering at a temperature of 1300℃ and a holding time of 5h. The oxygen content in the holding section is controlled at 2.5%, and the oxygen concentration in the cooling section is controlled according to a=-12535 and b=5.

[0040] Example 2

[0041] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite alloy is composed of a main component and secondary components. The main component is Fe2O3: 49.5 mol%, MnO: 30.75 mol%, ZnO: 19.0 mol%, NiO: 0.75 mol%. The secondary components are Co2O3: 0.3 wt%, SiO2: 0.005 wt%, CaCO3: 0.02 wt%, and ZrO2: 0.01 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, ZnO, MnO, and NiO.

[0042] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0043] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and NiO according to the ratio and grind them in a sand mill for 30 minutes. Then dry the mixed and ground slurry in an oven.

[0044] 2) Pre-firing: The mixed powder is pre-firing at a temperature of 850℃ for 3 hours to obtain pre-fired material;

[0045] 3) Sand milling: The by-products are added to the pre-calcined material for secondary mixing. The sand milling time is 40 min and the particle size D50 is 1.25 μm.

[0046] 4) Granulation: Dry the slurry after sand milling, and add 10wt% PVA solution by weight of powder for granulation;

[0047] 5) Molding: The granulated particles are pressed to a density of 3.1 g·cm³. -3 This yields a T25*15*7.5 blank magnetic ring;

[0048] 6) Sintering: The blank is sintered in a bell-shaped furnace at a temperature of 1310℃ and a holding time of 3h. The oxygen concentration is 3.0%. The oxygen concentration is controlled by taking the values ​​a = -11050 and b = 5.5 for the cooling sections.

[0049] Example 3

[0050] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component is Fe2O3: 49.8 mol%, MnO: 28.2 mol%, ZnO: 20.0 mol%, NiO: 2.0 mol%. The secondary components are Co2O3: 0.3 wt%, SiO2: 0.008 wt%, CaCO3: 0.04 wt%, ZrO2: 0.02 wt%, and Bi2O3: 0.02 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, ZnO, MnO, and NiO.

[0051] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0052] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and NiO according to the ratio and grind them in a sand mill for 30 minutes. Then dry the mixed and ground slurry in an oven.

[0053] 2) Pre-firing: The mixed powder is pre-firing at a temperature of 950℃ for 3 hours to obtain the pre-fired material;

[0054] 3) Sand milling: The by-products are added to the pre-calcined material for secondary mixing, and the sand milling time is 90 min; the particle size D50 is 1.47 μm;

[0055] 4) Granulation: The slurry after sand milling is dried and then granulated;

[0056] 5) Molding: The granulated particles are pressed, and the raw compaction density is 3.10 g·cm³. -3 This yields a T25*15*7.5 blank magnetic ring;

[0057] 6) Sintering: The blank magnetic ring is sintered in a bell furnace at a temperature of 1280℃ for 5 hours. The oxygen content in the holding section is controlled at 1.0%. The oxygen content in the cooling section is controlled by taking values ​​of a = -14500 and b = 8 respectively.

[0058] Example 4

[0059] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component is Fe2O3: 49.0 mol%, MnO: 29.0 mol%, ZnO: 20.0 mol%, NiO: 2.0 mol%. The secondary components are Co2O3: 0.3 wt%, SiO2: 0.01 wt%, CaCO3: 0.02 wt%, ZrO2: 0.02 wt%, and V2O5: 0.05 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, MnO, ZnO, and NiO.

[0060] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0061] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and NiO according to the ratio, and grind them in a sand mill for 30 minutes.

[0062] 2) Pre-firing: The mixed powder is pre-firing at 950℃ for 1 hour to obtain pre-fired material;

[0063] 3) Sand milling: The by-products are added to the pre-calcined material for secondary mixing. The sand milling time is 80 min and the particle size D50 is 1.05 μm.

[0064] 4) Granulation: Dry the slurry after sand milling, add 8wt% PVA solution by weight of powder and then granulate;

[0065] 5) Molding: The granulated particles are pressed to control the pressing density at 3.05 g·cm³. -3 This yields a T25*15*7.5 blank magnetic ring;

[0066] 6) Sintering: The blank magnetic ring is sintered in a bell furnace at a temperature of 1285℃ for 3 hours with an oxygen concentration of 3.5%. The oxygen content in the cooling section is controlled by taking values ​​a = -14500 and b = 7 respectively.

[0067] Example 5

[0068] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component is Fe2O3: 49.8 mol%, MnO: 29.7 mol%, ZnO: 19.5 mol%, NiO: 1.0 mol%. The secondary components are Co2O3: 0.2 wt%, SiO2: 0.005 wt%, CaCO3: 0.04 wt%, ZrO2: 0.015 wt%, and V2O5: 0.025 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, MnO, ZnO, and NiO.

[0069] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0070] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and NiO according to the ratio and grind them in a sand mill for 20 minutes. Then dry the mixed and ground slurry in an oven.

[0071] 2) Pre-firing: The mixed powder is pre-firing at 800℃ for 1 hour to obtain pre-fired material;

[0072] 3) Sand milling: The secondary components are added to the pre-calcined material for secondary mixing. The sand milling time is 40 min and the particle size D50 is 1.16 μm.

[0073] 4) Granulation: Dry the slurry after sand milling, add 10wt% PVA solution by weight of powder and then granulate;

[0074] 5) Molding: The granulated particles are pressed to control the pressing density at 3.15 g·cm³. -3 This yields a T25*15*7.5 blank magnetic ring;

[0075] 6) Sintering: The blank magnetic ring is sintered in a bell furnace at a temperature of 1285℃ for 5 hours with an oxygen concentration of 2.5%. The oxygen content in the cooling section is controlled by taking values ​​a = -12500 and b = 8 respectively.

[0076] Example 6

[0077] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component is Fe2O3: 49.5 mol%, MnO: 29.5 mol%, ZnO: 20.0 mol%, NiO: 1.0 mol%. The secondary components are Co2O3: 0.2 wt%, SiO2: 0.006 wt%, CaCO3: 0.05 wt%, ZrO2: 0.015 wt%, and V2O5: 0.045 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, MnO, ZnO, and NiO.

[0078] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0079] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and ZnO according to the ratio and grind them in a sand mill for 30 minutes. Then dry the mixed and ground slurry in an oven.

[0080] 2) Pre-firing: The mixed powder is pre-firing at 950℃ for 3 hours to obtain pre-fired material;

[0081] 3) Sand milling: The secondary components are added to the pre-calcined material for secondary mixing. The sand milling time is 90 min and the particle size D50 is 1.24 μm.

[0082] 4) Granulation: Dry the slurry after sand milling, add 10wt% PVA solution by weight of powder and then granulate;

[0083] 5) Molding: The granulated particles are pressed to control the pressing density at 3.10 g·cm³. -3 This yields a T25*15*7.5 blank magnetic ring;

[0084] 6) Sintering: The blank magnetic ring is sintered in a bell furnace at a temperature of 1310℃ for 5 hours with an oxygen concentration of 3.5%. The oxygen content in the cooling section is controlled by taking values ​​a = -12000 and b = 6 respectively.

[0085] Comparative Example 1

[0086] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component is Fe2O3: 49.5 mol%, MnO: 32.5 mol%, ZnO: 18.0 mol%, NiO: 0 mol%. The secondary components are Co2O3: 0.2 wt%, SiO2: 0.01 wt%, CaCO3: 0.05 wt%, ZrO2: 0 wt%, Bi2O3: 0.02 wt%, and V2O5: 0.025 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, MnO, ZnO, and NiO.

[0087] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0088] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and NiO according to the ratio and grind them in a sand mill for 30 minutes. Then dry the mixed and ground slurry in an oven.

[0089] 2) Pre-firing: The mixed powder is pre-firing at 900℃ for 3 hours to obtain pre-fired material;

[0090] 3) Sand milling: The by-products are added to the pre-calcined material for secondary mixing. The sand milling time is 75 min and the particle size is 1.15 μm.

[0091] 4) Granulation: Dry the slurry after sand milling, add 8wt% PVA solution by weight of powder and then granulate;

[0092] 5) Molding: The granulated particles are pressed to control the pressing density at 3.10 g·cm³. -3This yields a T25*15*7.5 blank magnetic ring;

[0093] 6) Sintering: The blank magnetic ring is sintered in a bell furnace at a temperature of 1310℃ for 5 hours with an oxygen concentration of 3.5%. The oxygen content in the cooling section is controlled by taking values ​​a = -12000 and b = 6 respectively.

[0094] Comparative Example 2

[0095] A high Curie temperature, high frequency, high impedance manganese-zinc ferrite material is composed of a main component and secondary components. The main component is Fe2O3: 48.0 mol%, MnO: 29.5 mol%, ZnO: 22.0 mol%, NiO: 0.5 mol%, and the secondary components are Co2O3: 0.2 wt%, SiO2: 0.005 wt%, CaCO3: 0.02 wt%, ZrO2: 0 wt%, Bi2O3: 0.01 wt%, and V2O5: 0.05 wt%. The above secondary components are calculated according to the total weight percentage of Fe2O3, MnO, ZnO, and NiO.

[0096] The preparation method of the above-mentioned high Curie temperature high frequency high impedance manganese zinc ferrite material includes the following steps:

[0097] 1) Ingredients: Weigh and mix the main components Fe2O3, MnO, ZnO and Co2O3 according to the ratio and grind them in a sand mill for 30 minutes. Then dry the mixed and ground slurry in an oven.

[0098] 2) Pre-firing: The mixed powder is pre-firing at 900℃ for 3 hours to obtain the premixed material;

[0099] 3) Sand milling: The secondary components are added to the pre-calcined material for secondary mixing. The sand milling time is 75 min and the particle size is 1.15 μm.

[0100] 4) Granulation: Dry the slurry after sand milling, add 8wt% PVA solution by weight of powder and then granulate;

[0101] 5) Molding: The granulated particles are pressed to control the pressing density at 3.10 g·cm³. -3 This yields a T25*15*7.5 blank magnetic ring;

[0102] 6) Sintering: The blank magnetic ring is sintered in a bell furnace at a temperature of 1310℃ for 5 hours with an oxygen concentration of 3.5%. The oxygen content in the cooling section is controlled by taking values ​​a = -12000 and b = 6 respectively.

[0103] Performance tests were conducted on Examples 1-6 and Comparative Examples 1-2, and the test results are shown in Table 1:

[0104] Table 1

[0105]

[0106] Therefore, the manganese-zinc ferrite material prepared in this invention has high Curie temperature, high frequency and high impedance characteristics, which meets the development needs of electronic equipment in the electronics and communications industries for high-temperature applications.

[0107] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0108] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high Curie temperature, high frequency, high impedance Mn-Zn ferrite material, characterized in that, The main component consists of Fe2O3: 48.5-49.9 mol%, ZnO: 18.5-21.5 mol%, NiO: 0.5-2.0 mol%, and the rest is MnO; the secondary component includes Co2O3: 0.05-0.30 wt%, SiO2: 0.005-0.01 wt%, CaCO3: 0.02-0.05 wt%, and ZrO2: 0.01-0.02 wt%, based on the weight of the main component.

2. The high Curie temperature, high frequency, high permeability Mn-Zn ferrite material of claim 1, wherein, The main component consists of Fe2O3: 49-49.8 mol%, ZnO: 19-20 mol%, NiO: 0.75-2.0 mol%, and the rest is MnO.

3. The method of producing high curie temperature high frequency high impedance Mn-Zn ferrite material according to claim 1, characterized in that, The method comprises the following steps: 1) batching: weighing the main component according to the proportion and mixing the sand mill with deionized water in a sand mill, and then drying the mixed sand mill slurry in an oven; 2) pre-burning: pre-burning the dried mixed sand mill powder in a muffle furnace to obtain a pre-burned material; 3) sand milling: adding the secondary component to the pre-burned material in proportion and performing secondary sand milling in a sand mill; 4) granulation: drying the secondary sand-milled slurry in an oven, adding PVA solution, and performing granulation; 5) forming: pressing the granulated particles to obtain a T25*15*7.5 blank magnetic ring; 6) sintering: sintering the blank magnetic ring in a bell jar furnace, and holding and cooling.

4. The method of producing a high Curie temperature, high frequency, high impedance Mn-Zn ferrite material according to claim 3, characterized in that, The sand milling time in step 1) is 20-60 min.

5. The method of producing high curie temperature high frequency high impedance Mn-Zn ferrite material as claimed in claim 3, wherein, The pre-burning temperature in step 2) is 800-950°C, and the holding time is 1-3 h.

6. The method of producing a high curie temperature high frequency high impedance Mn-Zn ferrite material according to claim 3, characterized in that, The particle size D50 of the sand-milled powder in step 3) is 1.0-1.5 μm, and the sand milling time is 40-90 min.

7. The method of producing a high curie temperature high frequency high impedance Mn-Zn ferrite material according to claim 3, characterized by, The amount of PVA solution used in step 4) is 8-10 wt% of the dry powder weight.

8. The method of producing a high curie temperature high frequency high impedance Mn-Zn ferrite material according to claim 3, characterized by, The compacted density in step 5) is 2.9 to 3.2 g-cm -3 .

9. The method of producing a high curie temperature high frequency high impedance Mn-Zn ferrite material according to claim 3, characterized by, The sintering temperature in step 6) is 1285-1325°C; the holding time is 3-5 h; the oxygen concentration during holding is 1.0-3.5%; and the equilibrium oxygen concentration during cooling is controlled according to the formula: lgPO2=a / T+b, wherein a is-14500 to-10000, b is 5-8, and T is the absolute temperature in K.

10. The method of producing a high curie temperature, high frequency, high impedance Mn-Zn ferrite material according to claim 3, characterized in that, The sintering temperature in step 6) is 1285-1310°C.

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