A nickel-zinc ferrite material, a preparation method and application thereof

Abstract

The application relates to a nickel-zinc ferrite material and a preparation method and application thereof. The nickel-zinc ferrite material comprises main components and doped components, the main components comprise Fe2O3, NiO, ZnO and CuO, the doped components comprise Nd2O3, the doped components account for 0.001-0.005 wt% of the main components; the total mass of the main components is 100 wt%, the content of the Fe2O3 is 64.32-66.12 wt%, the content of the NiO is 8.89-9.91 wt%, the content of the ZnO is 17.12-18.15 wt%, and the content of the CuO is 6-10 wt%. The composition and content of the main components and the doped components of the nickel-zinc ferrite material are regulated, so that the Curie temperature and the high-frequency impedance coefficient are effectively improved while the high magnetic permeability and the saturation magnetic induction intensity are ensured.

Description

Technical Field

[0001] This invention relates to the field of magnetic materials technology, and in particular to a nickel-zinc ferrite material, its preparation method, and its application. Background Technology

[0002] With the development of electronic and power technology, the trend of electronic devices towards miniaturization, high frequency, and high current is inevitable. Therefore, the performance requirements for soft magnetic materials in electronic devices are also increasing. NiZn soft magnetic ferrites have advantages such as excellent high-frequency characteristics, good temperature stability, diverse formulations, large nonlinearity, and simple preparation process, and are widely used in television, communications, instrumentation, automatic control, electronic warfare and other fields.

[0003] NiZn ferrite materials can be divided into three main categories according to their applications and characteristics: high frequency, high saturation magnetic induction, and high initial permeability. However, they still have unavoidable drawbacks. For example, in order to achieve high permeability, the ZnO content of high-impedance NiZn ferrite materials must be increased, which leads to a significant decrease in their Curie temperature. Furthermore, high permeability will lower their cutoff frequency, and the impedance decrease is more pronounced at frequencies of tens of megahertz.

[0004] The prior art CN115925405A discloses a NiCuZn soft magnetic ferrite material with high permeability and high Curie temperature. Its main components include Fe2O3: 66.22wt%–68.65wt%; ZnO: 18.30wt%–22.15wt%; NiO: 7.75wt%–9.85wt%; with the balance being CuO. The dopants include Y2O3, MoO3, V2O5, and MnCO3, wherein Y2O3 accounts for 0.05wt%–0.1wt% of the main component mass, MoO3 accounts for 0.06wt%–0.18wt% of the main component mass, V2O5 accounts for 0.05wt%–0.15wt% of the main component mass, and MnCO3 accounts for 0.55wt% of the main component mass. At a test frequency of 100kHz, the initial permeability is 2011, and the specific loss coefficient is 28.78 × 10⁻⁶. -6 The Curie temperature is 145℃ and the saturation magnetic induction intensity Bs=352mT (10kHz, 4000A / m). The ferrite material disclosed in this prior art has extremely high initial magnetic permeability, but if it is to be used in automotive products, its Curie temperature must reach above 160℃. However, its Curie temperature is too low and cannot reach a high level.

[0005] CN109320227 discloses a NiCuZn ferrite material, its preparation method, and its uses. The NiCuZn ferrite material is mainly composed of Fe2O3, ZnO, NiO, and CuO. Based on the total molar amount of the NiCuZn ferrite material as 100%, the molar percentage of Fe2O3 is 48.8 mol%–50 mol%, the molar percentage of ZnO is 32–34 mol%, the molar percentage of NiO is 6.5–8 mol%, and the molar percentage of CuO is 8.5–12.7 mol%. The prepared NiCuZn ferrite material exhibits an initial permeability of 1600–2000 in the 100–300 kHz range, a saturation magnetic induction intensity Bs ≥ 240 mT at 25 °C, and a Curie temperature of 95–110 °C. While the ferrite material disclosed in this prior art also possesses a high initial permeability, its saturation magnetic induction intensity is relatively low, making it unsuitable for common-mode circuits. Furthermore, its Curie temperature is only 110 °C, limiting its application scope.

[0006] Therefore, how to provide a nickel-zinc ferrite material that simultaneously possesses high permeability, saturation magnetic induction, Curie temperature, and impedance coefficient has become an urgent problem to be solved. Summary of the Invention

[0007] To address the aforementioned technical problems, the present invention aims to provide a nickel-zinc ferrite material, its preparation method, and its applications. By controlling the composition and content of the main components and dopants in the nickel-zinc ferrite material, the present invention effectively improves the Curie temperature and high-frequency impedance coefficient of the material while ensuring high permeability and saturation magnetic induction.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a nickel-zinc ferrite material, the nickel-zinc ferrite material comprising a main component and a dopant component, the main component comprising Fe2O3, NiO, ZnO and CuO, the dopant component comprising Nd2O3, the dopant component comprising 0.001-0.005 wt% of the main component;

[0010] With the total mass of the main components being 100wt%, the content of Fe2O3 is 64.32-66.12wt%, the content of NiO is 8.89-9.91wt%, the content of ZnO is 17.12-18.15wt%, and the content of CuO is 6-10wt%.

[0011] In this invention, the dopant component accounts for "0.001-0.005 wt%" of the main component, for example, 0.001 wt%, 0.0015 wt%, 0.002 wt%, 0.0025 wt%, 0.003 wt%, 0.0035 wt%, 0.004 wt%, 0.0045 wt%, or 0.005 wt%, etc.; the Fe2O3 is selected in the range of "64.32-66.12 wt%", for example... The NiO content is 64.32 wt%, 64.40 wt%, 64.60 wt%, 64.80 wt%, 65.00 wt%, 65.20 wt%, 65.40 wt%, 65.60 wt%, 65.80 wt%, 66.00 wt%, or 66.12 wt%, etc.; the NiO content is selected in the range of "8.89-9.91 wt%", for example, 8.89 wt%, 8.90 wt%, 9.00 wt%, 9.10 wt%. The ZnO content is 9.20 wt%, 9.30 wt%, 9.40 wt%, 9.50 wt%, 9.60 wt%, 9.70 wt%, 9.80 wt%, 9.90 wt%, or 9.91 wt%, etc.; the ZnO content is selected within the range of "17.12-18.15 wt%", for example, 17.12 wt%, 17.20 wt%, 17.30 wt%, 17.40 wt%, 17.50 wt%, 17.60 wt%, etc. The concentrations of CuO are 0 wt%, 17.70 wt%, 17.80 wt%, 17.90 wt%, 18.00 wt%, 18.10 wt%, or 18.15 wt%, etc.; the range of CuO is "6-10 wt%", for example, 6 wt%, 6.4 wt%, 6.8 wt%, 7.2 wt%, 7.6 wt%, 8 wt%, 8.4 wt%, 8.8 wt%, 9.2 wt%, 9.6 wt%, or 10 wt%, etc.

[0012] This invention, by controlling the composition and content of the main components of nickel-zinc ferrite materials and introducing a specific amount of Nd₂O₃ dopant, can ensure high permeability and saturation magnetic induction of the nickel-zinc ferrite material, while also effectively improving the Curie temperature and high-frequency impedance coefficient, thus giving the nickel-zinc ferrite material excellent comprehensive performance. Specifically, the introduction of copper oxide into the nickel-zinc ferrite material aims to promote solid-state reactions during pre-sintering and sintering; the doping of Nd₂O₃ can affect the crystal field in the material, increasing the supertransfer interaction between magnetic ions, which is beneficial to increasing its Curie temperature.

[0013] Preferably, the dopant component accounts for 0.003-0.004 wt% of the main component, such as 0.003 wt%, 0.0032 wt%, 0.0034 wt%, 0.0036 wt%, 0.0038 wt%, or 0.004 wt%.

[0014] This invention further regulates the content of doping components, which can further avoid a significant decrease in the magnetic permeability of ferrite materials, while improving the high-frequency impedance coefficient and Curie temperature of ferrite materials.

[0015] Preferably, the density of the nickel-zinc ferrite material is 4.5-5.5 g / cm³. 3 For example, 4.5g / cm 3 4.6g / cm 3 4.7g / cm 3 4.8g / cm 3 4.9g / cm 3 5.0g / cm 3 5.1g / cm 3 5.2g / cm 3 5.3g / cm 3 5.4g / cm 3 Or 5.5g / cm 3 wait.

[0016] Preferably, the magnetic permeability of the nickel-zinc ferrite material is 883.9-996.3 H / m, such as 883.9 H / m, 890.0 H / m, 900.0 H / m, 910.0 H / m, 920.0 H / m, 930.0 H / m, 940.0 H / m, 950.0 H / m, 960.0 H / m, 970.0 H / m, 980.0 H / m, 990.0 H / m, or 996.3 H / m.

[0017] Preferably, the saturation magnetic induction intensity of the nickel-zinc ferrite material is 374.8-380.8 mT, such as 374.8 mT, 375.0 mT, 375.5 mT, 376.0 mT, 376.5 mT, 377.0 mT, 377.5 mT, 378.0 mT, 378.5 mT, 379.0 mT, 379.5 mT, 380.0 mT, 380.5 mT, or 380.8 mT.

[0018] Preferably, the impedance coefficient of the nickel-zinc ferrite material at 30MHz is 60.8-62.3, such as 60.8, 61.0, 61.2, 61.4, 61.6, 61.8, 62.0, 62.2 or 62.3.

[0019] Preferably, the impedance coefficient of the nickel-zinc ferrite material at 50MHz is 74.6-76.6, such as 74.6, 74.8, 75.0, 75.2, 75.4, 75.6, 75.8, 76.0, 76.2, 76.4 or 76.6.

[0020] Preferably, the Curie temperature of the nickel-zinc ferrite material is 130-180℃, such as 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, 160℃, 165℃, 170℃, 175℃ or 180℃, and more preferably 160-180℃.

[0021] In a second aspect, the present invention provides a method for preparing the nickel-zinc ferrite material according to the first aspect, the method comprising the following steps:

[0022] (1) Fe2O3, NiO, ZnO and CuO are mixed according to the formula amount, and then pre-calcined to obtain pre-calcined mixture;

[0023] (2) The pre-calcined mixture, the formulated amount of Nd2O3 and the binder are mixed for a second time, and then pressed and sintered to obtain the nickel-zinc ferrite material.

[0024] This invention provides a method for preparing nickel-zinc ferrite materials with high Curie temperature and high impedance coefficient. By adjusting the formulation amount of the main components and the amount of dopant added, and combining the mixing process, pressing process and sintering process, it is possible to ensure that the obtained nickel-zinc ferrite material has high magnetic permeability, high saturation magnetic induction intensity and high frequency and high impedance coefficient, while effectively increasing its Curie temperature. Moreover, the manufacturing process is simple and conducive to industrial production.

[0025] Preferably, in step (2), the first mixing is performed using a ball milling process.

[0026] Preferably, the mixing time in step (1) is 2-3 hours, such as 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours or 3 hours.

[0027] Preferably, the rotational speed of the first mixing in step (1) is 300-500 r / min, such as 300 r / min, 320 r / min, 340 r / min, 360 r / min, 380 r / min, 400 r / min, 420 r / min, 440 r / min, 460 r / min, 480 r / min or 500 r / min.

[0028] Preferably, after the first mixing in step (1), a first drying process is also performed.

[0029] Preferably, the first dried product is further subjected to a first sieve.

[0030] Preferably, the mesh size of the first sieve is 20-50 mesh, such as 20 mesh, 25 mesh, 30 mesh, 35 mesh, 40 mesh, 45 mesh or 50 mesh, etc.

[0031] Preferably, the preheating temperature in step (1) is 800-850℃, such as 800℃, 810℃, 820℃, 830℃, 840℃ or 850℃.

[0032] Preferably, the heating rate of the preheating in step (1) is 1-3℃ / min, such as 1℃ / min, 1.5℃ / min, 2℃ / min, 2.5℃ / min or 3℃ / min.

[0033] Preferably, the pre-burning time in step (1) is 1-3 hours, such as 1 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours, 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours or 3 hours.

[0034] Preferably, the specific process of the second mixing in step (2) includes: mixing the pre-calcined mixture with the Nd2O3, and then granulating the product obtained by mixing with the binder to obtain a mixture.

[0035] Preferably, the pre-calcined mixture is subjected to a second sieving before the second mixing.

[0036] Preferably, the mesh size of the second sieve is 20-50 mesh, such as 20 mesh, 25 mesh, 30 mesh, 35 mesh, 40 mesh, 45 mesh or 50 mesh, etc.

[0037] Preferably, in the second mixing step (2), the pre-calcined mixture and the Nd2O3 are mixed by ball milling.

[0038] Preferably, in the second mixing step (2), the mixing time of the pre-calcined mixture and the Nd2O3 is 2-3 hours, such as 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours or 3 hours.

[0039] Preferably, in the second mixing step (2), the mixing speed of the pre-calcined mixture and the Nd2O3 is 300-500 r / min, for example, 300 r / min, 320 r / min, 340 r / min, 360 r / min, 380 r / min, 400 r / min, 420 r / min, 440 r / min, 460 r / min, 480 r / min or 500 r / min.

[0040] Preferably, the product after mixing the pre-calcined mixture with the Nd2O3 is further subjected to a second drying process.

[0041] Preferably, the dried product is further subjected to a third sieve.

[0042] Preferably, the third sieve has a mesh size of 20-50.

[0043] Preferably, the particle size D50 of the product after the third sieving is 1.0-1.2 μm, such as 1.0 μm, 1.1 μm or 1.2 μm.

[0044] Preferably, the particle size D99 of the product after the third sieving is 9.0-12.0 μm, such as 9.0 μm, 10.0 μm, 11.0 μm or 12.0 μm.

[0045] Preferably, the adhesive comprises polyvinyl alcohol.

[0046] Preferably, the concentration of the adhesive is 70-90 wt%, such as 70 wt%, 75 wt%, 80 wt%, 85 wt%, or 90 wt%.

[0047] Preferably, the amount of binder added is 5-13 wt% of the total mass of the pre-calcined mixture and the Nd2O3, such as 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, or 13 wt%.

[0048] Preferably, the pressing pressure in step (2) is 5-10 MPa, such as 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa, etc.

[0049] Preferably, the sintering temperature in step (2) is 1140-1180℃, such as 1140℃, 1150℃, 1160℃, 1170℃ or 1180℃.

[0050] In this invention, if the sintering temperature is too high, the sample will be overburned, and the magnetic permeability and other properties will decrease; if the sintering temperature is too low, the solid-phase reaction will be incomplete, and the overall performance of the resulting ferrite material will decrease.

[0051] Preferably, the sintering time in step (2) is 2-3 hours, such as 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours or 3 hours.

[0052] Preferably, the heating rate of the sintering in step (2) is 3-5℃ / min, such as 3℃ / min, 3.5℃ / min, 4℃ / min, 4.5℃ / min or 5℃ / min.

[0053] Preferably, the sintering atmosphere in step (2) is an air atmosphere.

[0054] As a preferred embodiment of the present invention, the preparation method includes the following steps:

[0055] (1) Fe2O3, NiO, ZnO and CuO are ball-milled and mixed at a speed of 300-500 r / min for 2-3 h under the conditions of ball milling media and grinding aid. After the first drying, the product after the first drying is sieved through a 20-50 mesh screen to obtain the first mixture. Then, the first mixture is pre-calcined at a heating rate of 1-3 °C / min from room temperature to 800-850 °C for 1-3 h to obtain the pre-calcined mixture.

[0056] (2) The pre-calcined mixture is second-sieved using a 20-50 mesh sieve. Then, the prescribed amount of Nd₂O₃ is added to the ball milling media and grinding aid, and the mixture is ball-milled at 300-500 r / min for 2-3 hours. After a second drying, the product from the second drying process is third-sieved using a 20-50 mesh sieve. The particle size D50 of the product after the third sieve is 1.0-1.2 μm, and the particle size D99 is 9.0-12.0 μm. A binder with a concentration of 70-90 wt% is added and stirred and granulated. The amount of binder added is 5-13 wt% of the total mass of the pre-calcined mixture and the Nd2O3 to obtain a second mixture. The second mixture is pressed and shaped under a pressure of 5-10 MPa. Then, the pressed product is sintered for 2-3 hours in air atmosphere at a heating rate of 3-5 °C / min from room temperature to 1140-1180 °C to obtain the nickel-zinc ferrite material.

[0057] In this invention, room temperature refers to a temperature of 20-30℃, such as 20℃, 21℃, 22℃, 23℃, 24℃, 25℃, 26℃, 27℃, 28℃, 29℃, or 30℃.

[0058] Thirdly, the present invention provides an application of the nickel-zinc ferrite material according to the first aspect, wherein the nickel-zinc ferrite material is applied in the fields of television, communications, instrumentation, automatic control or electronic countermeasures.

[0059] Compared with the prior art, the present invention has at least the following beneficial effects:

[0060] (1) By controlling the composition and content of the main components of nickel-zinc ferrite material and introducing a specific amount of Nd2O3 doping component, this invention can ensure the high permeability and saturation magnetic induction intensity of nickel-zinc ferrite material, while also effectively improving the Curie temperature and high-frequency impedance coefficient of the material, thereby giving the nickel-zinc ferrite material excellent comprehensive performance.

[0061] (2) This invention provides a method for preparing nickel-zinc ferrite materials with high Curie temperature and high impedance coefficient. By adjusting the formulation amount of the main components and the amount of dopant added, and combining the mixing process, pressing process and sintering process, it is possible to ensure that the nickel-zinc ferrite material has high magnetic permeability, high saturation magnetic induction intensity and high frequency and high impedance coefficient, while effectively increasing its Curie temperature. Moreover, the manufacturing process is simple and conducive to industrial production. Detailed Implementation

[0062] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0063] Example 1

[0064] This embodiment provides a nickel-zinc ferrite material, comprising main components and dopant components. The total mass of the main components is 100 wt%. The main components include 64.5 wt% Fe₂O₃, 9 wt% NiO, 17.5 wt% ZnO, and 9 wt% CuO. The dopant component includes Nd₂O₃, which accounts for 0.004 wt% of the total mass of the main components. The density of the nickel-zinc ferrite material is approximately 5.1 g / cm³. 3 .

[0065] This embodiment also provides a method for preparing the above-mentioned nickel-zinc ferrite material, the specific steps of which include the following:

[0066] (1) Fe2O3, NiO, ZnO and CuO were ball-milled for 2.5 h at a speed of 390 r / min under the condition of using water as grinding aid and zirconia balls as ball milling media according to the formula. After the first drying, the product after the first drying was sieved through a 30-mesh sieve to obtain the first mixture. Then, the first mixture was pre-calcined at 820°C for 2 h at a heating rate of 2°C / min from room temperature of 25°C to obtain the pre-calcined mixture.

[0067] (2) The pre-calcined mixture obtained in step (1) is sieved a second time using a 30-mesh sieve. Then, the prescribed amount of Nd₂O₃ is added, and the mixture is ball-milled for 2.5 hours at a speed of 390 r / min using water as a grinding aid and zirconia balls as the ball milling medium. After a second drying, the product after the second drying is sieved a third time using a 30-mesh sieve. The particle size D50 of the product after the third sieve is 1.0-1.2 μm, and the particle size D90 of the second mixture is 9.0-12.0 μm. PVA adhesive with a concentration of 80 wt% was added to the product and stirred and granulated. The amount of PVA adhesive added was 10 wt% of the total mass of the pre-calcined mixture and Nd2O3 to obtain a second mixture. The second mixture was then pressed into a sample ring under a pressure of 6 MPa. The sample ring had an inner diameter of 10 mm, an outer diameter of 20 mm, and a height of 5 mm. Then, the obtained sample ring was sintered in air at a heating rate of 3 °C / min from room temperature of 25 °C to 1150 °C for 2 h to obtain nickel-zinc ferrite material.

[0068] Example 2

[0069] This embodiment provides a nickel-zinc ferrite material, comprising main components and dopant components. The total mass of the main components is 100 wt%. The main components include 64.32 wt% Fe₂O₃, 9.91 wt% NiO, 17.12 wt% ZnO, and 8.65 wt% CuO. The dopant component includes Nd₂O₃, which accounts for 0.004 wt% of the total mass of the main components. The density of the nickel-zinc ferrite material is 5.1 g / cm³. 3 .

[0070] This embodiment also provides a method for preparing the above-mentioned nickel-zinc ferrite material, the specific steps of which include the following:

[0071] (1) Fe2O3, NiO, ZnO and CuO were ball-milled for 3 hours at a speed of 300 r / min under the condition of using water as grinding aid and zirconia balls as ball milling media according to the formula. After the first drying, the product after the first drying was sieved through a 30-mesh sieve to obtain the first mixture. Then, the first mixture was pre-calcined at 800°C for 3 hours at a heating rate of 3°C / min from room temperature of 25°C to 850°C to obtain the pre-calcined mixture.

[0072] (2) The pre-calcined mixture obtained in step (1) is sieved a second time through a 30-mesh sieve, and then the prescribed amount of Nd2O3 is added. Under the conditions of water as a grinding aid and zirconia balls as the ball milling medium, the mixture is ball-milled at 300 r / min for 3 h. After a second drying, the product after the second drying is sieved a third time through a 30-mesh sieve. The particle size D50 of the product after the third sieve is 1.0-1.2 μm, and the particle size D90 of the second mixture is 9.0-12.0 μm. PVA adhesive with a concentration of 70 wt% was added to the material and stirred and granulated. The amount of PVA adhesive added was 10 wt% of the total mass of the pre-calcined mixture and Nd2O3 to obtain a second mixture. The second mixture was then pressed into a sample ring under a pressure of 5 MPa. The sample ring had an inner diameter of 10 mm, an outer diameter of 20 mm, and a height of 5 mm. Then, the obtained sample ring was sintered in air at a heating rate of 3 °C / min from room temperature of 25 °C to 1140 °C for 3 h to obtain a nickel-zinc ferrite material.

[0073] Example 3

[0074] This embodiment provides a nickel-zinc ferrite material, comprising main components and dopant components. The total mass of the main components is 100 wt%. The main components include 66.12 wt% Fe₂O₃, 8.89 wt% NiO, 18.15 wt% ZnO, and 6.84 wt% CuO. The dopant component includes Nd₂O₃, which accounts for 0.004 wt% of the total mass of the main components. The density of the nickel-zinc ferrite material is 5.1 g / cm³. 3 .

[0075] This embodiment also provides a method for preparing the above-mentioned nickel-zinc ferrite material, the specific steps of which include the following:

[0076] (1) Fe2O3, NiO, ZnO and CuO were ball-milled for 2 hours at a speed of 500 r / min under the condition of using water as grinding aid and zirconia balls as ball milling media according to the formula. After the first drying, the product after the first drying was sieved through a 30-mesh sieve to obtain the first mixture. Then, the first mixture was heated from room temperature of 25°C to 850°C for 1 hour at a heating rate of 3°C / min to obtain the pre-calcined mixture.

[0077] (2) The pre-calcined mixture obtained in step (1) is sieved a second time through a 30-mesh sieve, and then the prescribed amount of Nd2O3 is added. Under the conditions of water as a grinding aid and zirconia balls as the ball milling medium, the mixture is ball-milled at a speed of 500 r / min for 2 hours. After a second drying, the product after the second drying is sieved a third time through a 30-mesh sieve. The particle size D50 of the product after the third sieve is 1.0-1.2 μm, and the particle size D90 of the second mixture is 9.0-12.0 μm. PVA adhesive with a concentration of 90wt% was added to the mixture and stirred and granulated. The amount of PVA adhesive added was 10wt% of the total mass of the pre-calcined mixture and Nd2O3 to obtain a second mixture. The second mixture was then pressed into a sample ring under a pressure of 10MPa. The sample ring had an inner diameter of 10mm, an outer diameter of 20mm, and a height of 5mm. The obtained sample ring was then sintered in air at a heating rate of 5℃ / min from room temperature of 25℃ to 1180℃ for 2h to obtain a nickel-zinc ferrite material.

[0078] Example 4

[0079] The only difference between this embodiment and Embodiment 1 is that in the nickel-zinc ferrite material provided in this embodiment, Nd2O3 accounts for 0.003 wt% of the total mass of the main components. All other contents are the same as in Embodiment 1.

[0080] Example 5

[0081] The only difference between this embodiment and Embodiment 1 is that in the nickel-zinc ferrite material provided in this embodiment, Nd2O3 accounts for 0.002 wt% of the total mass of the main components. All other contents are the same as in Embodiment 1.

[0082] Example 6

[0083] The only difference between this embodiment and Embodiment 1 is that in the nickel-zinc ferrite material provided in this embodiment, Nd2O3 accounts for 0.001 wt% of the total mass of the main components. All other contents are the same as in Embodiment 1.

[0084] Example 7

[0085] The only difference between this embodiment and Embodiment 1 is that in the nickel-zinc ferrite material provided in this embodiment, Nd2O3 accounts for 0.005 wt% of the total mass of the main components. All other contents are the same as in Embodiment 1.

[0086] Comparative Example 1

[0087] The only difference between this comparative example and Example 1 is that Nd2O3 accounts for 0.01 wt% of the total mass of the main component in the nickel-zinc ferrite material provided in this comparative example. All other contents are the same as in Example 1.

[0088] Comparative Example 2

[0089] The only difference between this comparative example and Example 1 is that Nd₂O₃ is omitted in the nickel-zinc ferrite material provided in this comparative example. All other contents are the same as in Example 1.

[0090] Comparative Example 3

[0091] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 66.89wt%, the content of NiO is 7.64wt%, the content of ZnO is 19.54wt%, and the content of CuO is 5.93wt%. All other contents are the same as in Example 1.

[0092] Comparative Example 4

[0093] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 67.05wt%, the content of NiO is 7.42wt%, the content of ZnO is 20.37wt%, and the content of CuO is 5.16wt%. All other contents are the same as in Example 1.

[0094] Comparative Example 5

[0095] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 63.76wt%, the content of NiO is 9.81wt%, the content of ZnO is 17.64wt%, and the content of CuO is 8.79wt%. All other contents are the same as in Example 1.

[0096] Comparative Example 6

[0097] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 67.12wt%, the content of NiO is 8.97wt%, the content of ZnO is 17.32wt%, and the content of CuO is 6.59wt%. All other contents are the same as in Example 1.

[0098] Comparative Example 7

[0099] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 65.94wt%, the content of NiO is 8.14wt%, the content of ZnO is 20.76wt%, and the content of CuO is 5.16wt%. All other contents are the same as in Example 1.

[0100] Comparative Example 8

[0101] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 65.24wt%, the content of NiO is 10.27wt%, the content of ZnO is 18.05wt%, and the content of CuO is 6.44wt%. All other contents are the same as in Example 1.

[0102] Comparative Example 9

[0103] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 64.81wt%, the content of NiO is 9.65wt%, the content of ZnO is 16.34wt%, and the content of CuO is 9.20wt%. All other contents are the same as in Example 1.

[0104] Comparative Example 10

[0105] The only difference between this comparative example and Example 1 is that, in the nickel-zinc ferrite material provided in this comparative example, the total mass of the main components is 100wt%, the content of Fe2O3 is 64.73wt%, the content of NiO is 9.67wt%, the content of ZnO is 19.13wt%, and the content of CuO is 6.47wt%. All other contents are the same as in Example 1.

[0106] The nickel-zinc ferrite materials provided in Examples 1-7 and Comparative Examples 1-10 were tested for their permeability, impedance, saturation magnetic induction, and Curie temperature. Among them:

[0107] (1) Permeability test: The real part μ' of permeability at 1MHz was measured using an Agilent E4991A analyzer.

[0108] (2) Impedance test: The impedance of the nickel-zinc ferrite material obtained by the Agilent E4991A analyzer was measured, and the dimensionless impedance coefficient was calculated. The calculation formula is as follows:

[0109] Z / (A e / L e );

[0110] Where Z is the impedance, Ae is the window area of ​​the ferrite material, and Le is the magnetic circuit length.

[0111] (3) Saturation magnetic induction intensity: The nickel-zinc ferrite materials obtained in the examples and comparative examples were uniformly wound with 35 turns of straight 0.4mm copper wire. The test conditions were 50Hz, the test temperature was 25℃, and the maximum value of the applied magnetic field was 4000A / m.

[0112] (4) Curie temperature: The nickel-zinc ferrite material obtained in the examples and comparative examples was wound 10 turns evenly with a straight 0.4 mm copper wire, and then placed in an oven. The starting temperature was 30°C, and the interval was 10°C. The permeability was measured with a Wenke 6500B. The point where the permeability became 0 was the Curie temperature Tc.

[0113] The test results for the above parameters are shown in Table 1:

[0114] Table 1

[0115]

[0116]

[0117] The test results show that:

[0118] (1) As can be seen from Examples 1 to 7, the present invention, by controlling the composition and content of the main components and dopant components in the nickel-zinc ferrite material, effectively improves the Curie temperature and high-frequency impedance coefficient of the nickel-zinc ferrite material while ensuring its high permeability and saturation magnetic induction. Furthermore, by controlling the doping amount of the dopant components, the permeability, saturation magnetic induction, high-frequency impedance coefficient, and Curie temperature of the nickel-zinc ferrite material can be further improved, resulting in a nickel-zinc ferrite material with even better overall performance.

[0119] (2) A comparison of Example 1 with Comparative Examples 1 and 2 shows that if the amount of Nd2O3 added to the nickel-zinc ferrite provided by the present invention is too high, the magnetic permeability will decrease significantly. This is because Nd2O3... 3+ It will localize between grain boundaries, hindering the displacement of magnetic domain walls; if the dopant Nd₂O₃ is lacking, the Curie temperature of the material will be lower, because of the absence of Nd. 3+ It will reduce the supertransfer effect between magnetic ions.

[0120] (3) By comparing Example 1 with Comparative Examples 3-10, it can be seen that in the nickel-zinc ferrite material provided by the present invention, if the content of Fe2O3 is too low, the high-frequency impedance coefficient is too low; if the content of Fe2O3 is too high, the permeability is too low; if the content of NiO is too low, the saturation magnetic induction intensity Bs is too low; if the content of NiO is too high, the permeability decreases; if the content of ZnO is too low, the permeability is too low; if the content of ZnO is too high, the overall performance of the ferrite material decreases.

[0121] In summary, by controlling the composition and content of the main components of nickel-zinc ferrite materials and introducing a specific amount of Nd2O3 dopant, this invention can ensure the high permeability and saturation magnetic induction of nickel-zinc ferrite materials, while also effectively improving the Curie temperature and high-frequency impedance coefficient of the materials, thereby giving nickel-zinc ferrite materials excellent comprehensive performance.

[0122] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A nickel-zinc ferrite material, characterized in that, The nickel-zinc ferrite material is composed of a main component and a dopant component. The main component consists of Fe2O3, NiO, ZnO, and CuO, and the dopant component is Nd2O3, which accounts for 0.001-0.005 wt% of the main component. With the total mass of the main components being 100wt%, the content of Fe2O3 being 64.32-66.12wt%, the content of NiO being 8.89-9.91wt%, the content of ZnO being 17.12-18.15wt%, and the content of CuO being 6-10wt%.

2. The nickel-zinc ferrite material according to claim 1, characterized in that, The dopant component accounts for 0.003-0.004 wt% of the main component.

3. The nickel-zinc ferrite material according to claim 1, characterized in that, The density of the nickel-zinc ferrite material is 4.5-5.5 g / cm³. 3 .

4. The nickel-zinc ferrite material according to claim 1, characterized in that, The magnetic permeability of the nickel-zinc ferrite material is 883.9-996.3 H / m.

5. The nickel-zinc ferrite material according to claim 1, characterized in that, The saturation magnetic induction intensity of the nickel-zinc ferrite material is 374.8-380.8 mT.

6. The nickel-zinc ferrite material according to claim 1, characterized in that, The impedance coefficient of the nickel-zinc ferrite material at 30MHz is 60.8-62.

3.

7. The nickel-zinc ferrite material according to claim 1, characterized in that, The impedance coefficient of the nickel-zinc ferrite material at 50MHz is 74.6-76.

6.

8. The nickel-zinc ferrite material according to claim 1, characterized in that, The Curie temperature of the nickel-zinc ferrite material is 130-180℃.

9. The nickel-zinc ferrite material according to claim 8, characterized in that, The Curie temperature of the nickel-zinc ferrite material is 160-180℃.

10. A method for preparing a nickel-zinc ferrite material according to any one of claims 1-9, characterized in that, The preparation method includes the following steps: (1) Fe2O3, NiO, ZnO and CuO are mixed according to the formula amount, and then pre-fired to obtain pre-fired mixture; (2) The pre-calcined mixture, the formulated amount of Nd2O3 and the binder are mixed for a second time, and then pressed and sintered to obtain the nickel-zinc ferrite material.

11. The preparation method according to claim 10, characterized in that, Step (2) The first mixing is carried out using a ball milling process.

12. The preparation method according to claim 10, characterized in that, Step (1) The first mixing time is 2-3 hours.

13. The preparation method according to claim 10, characterized in that, Step (1) The rotation speed of the first mixing is 300-500 r / min.

14. The preparation method according to claim 10, characterized in that, Step (1) After the first mixing, a first drying process is also performed.

15. The preparation method according to claim 14, characterized in that, The first dried product is then subjected to a first sieve.

16. The preparation method according to claim 15, characterized in that, The first sieve has a mesh size of 20-50.

17. The preparation method according to claim 10, characterized in that, The preheating temperature in step (1) is 800-850℃.

18. The preparation method according to claim 10, characterized in that, The heating rate for preheating in step (1) is 1-3℃ / min.

19. The preparation method according to claim 10, characterized in that, The preheating time in step (1) is 1-3 hours.

20. The preparation method according to claim 10, characterized in that, Step (2) The specific process of the second mixing includes: mixing the pre-calcined mixture with the Nd2O3, and then granulating the product obtained by mixing with the binder to obtain a mixture.

21. The preparation method according to claim 10, characterized in that, Before the second mixing, the pre-calcined mixture is also subjected to a second sieving.

22. The preparation method according to claim 21, characterized in that, The second sieve has a mesh size of 20-50.

23. The preparation method according to claim 20, characterized in that, In step (2), the second mixing process involves ball milling to mix the pre-calcined mixture with the Nd2O3.

24. The preparation method according to claim 20, characterized in that, In step (2), the second mixing process, the mixing time between the pre-calcined mixture and the Nd2O3 is 2-3 hours.

25. The preparation method according to claim 20, characterized in that, In step (2), the mixing speed of the pre-calcined mixture and the Nd2O3 is 300-500 r / min.

26. The preparation method according to claim 20, characterized in that, The product obtained by mixing the pre-calcined mixture with the Nd2O3 is then subjected to a second drying process.

27. The preparation method according to claim 26, characterized in that, The dried product is then subjected to a third sieve.

28. The preparation method according to claim 27, characterized in that, The third sieve has a mesh size of 20-50.

29. The preparation method according to claim 27, characterized in that, The particle size D50 of the product after the third sieve is 1.0-1.2 μm.

30. The preparation method according to claim 27, characterized in that, The particle size D99 of the product after the third sieve is 9-12 μm.

31. The preparation method according to claim 10, characterized in that, The adhesive includes polyvinyl alcohol.

32. The preparation method according to claim 10, characterized in that, The concentration of the adhesive is 70-90 wt%.

33. The preparation method according to claim 10, characterized in that, The amount of binder added is 5-13 wt% of the total mass of the pre-calcined mixture and the Nd2O3.

34. The preparation method according to claim 10, characterized in that, The pressure for pressing in step (2) is 5-10 MPa.

35. The preparation method according to claim 10, characterized in that, The sintering temperature in step (2) is 1140-1180℃.

36. The preparation method according to claim 10, characterized in that, The sintering time in step (2) is 2-3 hours.

37. The preparation method according to claim 10, characterized in that, The heating rate for sintering in step (2) is 3-5℃ / min.

38. The preparation method according to claim 10, characterized in that, The sintering atmosphere in step (2) is an air atmosphere.

39. The preparation method according to claim 10, characterized in that, The preparation method includes the following steps: (1) Fe2O3, NiO, ZnO and CuO are ball-milled and mixed at a speed of 300-500 r / min for 2-3 h under the conditions of ball milling media and grinding aid. After the first drying, the product after the first drying is sieved through a 20-50 mesh screen to obtain the first mixture. Then, the first mixture is pre-calcined at a heating rate of 1-3 °C / min from room temperature to 800-850 °C for 1-3 h to obtain the pre-calcined mixture. (2) The pre-calcined mixture is sieved a second time using a 20-50 mesh sieve, and then the prescribed amount of Nd2O3 is added to the ball milling media and grinding aid. The mixture is ball-milled at a speed of 300-500 r / min for 2-3 hours. After a second drying, the product after the second drying is sieved a third time using a 20-50 mesh sieve. The particle size D50 of the product after the third sieve is 1.0-1.2 μm, and the particle size D99 is 9.0-12.0 μm. A binder with a concentration of 70-90 wt% is added and stirred and granulated. The amount of binder added is 5-13 wt% of the total mass of the pre-calcined mixture and the Nd2O3 to obtain a second mixture. The second mixture is pressed and shaped under a pressure of 5-10 MPa. Then, the pressed product is sintered for 2-3 hours in air atmosphere at a heating rate of 3-5℃ / min from room temperature to 1140-1180℃ to obtain the nickel-zinc ferrite material.

40. An application of the nickel-zinc ferrite material according to any one of claims 1-9, characterized in that, The nickel-zinc ferrite material is used in the fields of television, communications, instrumentation, automatic control, or electronic warfare.

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