WO2024032684A1 - Matériau de ferrite de manganèse-zinc haute fréquence à faible sensibilité à la contrainte, et procédé de préparation associé - Google Patents

Matériau de ferrite de manganèse-zinc haute fréquence à faible sensibilité à la contrainte, et procédé de préparation associé Download PDF

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WO2024032684A1
WO2024032684A1 PCT/CN2023/112106 CN2023112106W WO2024032684A1 WO 2024032684 A1 WO2024032684 A1 WO 2024032684A1 CN 2023112106 W CN2023112106 W CN 2023112106W WO 2024032684 A1 WO2024032684 A1 WO 2024032684A1
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zinc ferrite
stress
low
preparation
hours
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Chinese (zh)
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胡新跃
许校嘉
朱勇
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横店集团东磁股份有限公司
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    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2658—Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites
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    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
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Definitions

  • the embodiments of the present application belong to the technical field of magnetic core materials, such as a high-frequency manganese-zinc ferrite material, and particularly relate to a low-stress-sensitive high-frequency manganese-zinc ferrite material and a preparation method thereof.
  • manganese-zinc ferrite materials are widely used in the fields of electronics and communications as energy storage and conversion materials.
  • electronic components develop toward humanization, miniaturization, and high output power, the frequency of use of MnZn ferrite cores gradually moves from low frequency to high frequency.
  • CN 102503396A discloses a high-frequency low-loss MnZn ferrite and a preparation method thereof.
  • the high-frequency low-loss MnZn ferrite includes main materials: Fe 2 O 3 : 50.2 to 54 mol%, MnO: 36 to 42 mol%, ZnO: balance; auxiliary materials: CaCO 3 : 0.25 to 0.35 wt%, V 2 O 5 : 0.04 to 0.6 wt%, Nb 2 O 5 : 0.02 to 0.03 wt%.
  • the high-frequency low-loss MnZn ferrite disclosed in this patent has a power consumption of ⁇ 200mW/cm 3 at 100°C, 1MHz, and 30mT.
  • CN 104108925A discloses a preparation method of high-frequency manganese-zinc ferrite material.
  • the raw materials of the high-frequency manganese-zinc ferrite material include: Fe 2 O 3 , ZnO, MnO, SiO 2 , CaCO 3 , V 2 O 5.
  • TiO 2 and ZrO 2 where the molar ratio of Fe 2 O 3 :MnO:ZnO is (53 ⁇ 56): (38 ⁇ 41): (5 ⁇ 8), with Fe 2 O 3 , ZnO and MnO Based on the sum of masses, the mass fractions of SiO 2 , CaCO 3 , V 2 O 5 , TiO 2 , and ZrO 2 are 20 to 70 ppm, 100 to 800 ppm, 100 to 500 ppm, 200 to 2400 ppm, and 100 to 500 ppm respectively; the patent provides The power consumption of high-frequency low-loss manganese-zinc ferrite is ⁇ 330mW/cm 3 at 100°C, 1MHz, and 50mT.
  • CN 113277840A discloses a high-frequency, high-working magnetic density, low-loss manganese-zinc ferrite and a preparation method thereof.
  • the high-frequency, high-working magnetic density, low-loss manganese-zinc ferrite is composed of a main component and a sub-component.
  • the ingredients are calculated as oxides: Fe 2 O 3 : 54.55 ⁇ 55.20 mol%, ZnO: 4.0 ⁇ 5.0 mol%, and the balance is MnO into; the auxiliary component I based on the weight of the main component includes Nb 2 O 5 : 0.01 ⁇ 0.06wt%, Co 2 O 3 : 0.15 ⁇ 0.30wt%, CaCO 3 : 0.05 ⁇ 0.15wt%, V 2 O 5 : 0.01 ⁇ 0.04wt%, and the accessory component II is composed of at least two of NiO: 0.01 to 0.05wt%, SiO 2 : 0.005 to 0.015wt%, and MoO 3 : 0.01 to 0.05wt%.
  • the sintering temperature is 1060 ⁇ 1100°C, and the crushing particle size is 0.4 ⁇ 0.8 ⁇ m.
  • the material provided by this patent has a power consumption of less than 800kW/m 3 at 25°C ⁇ 100°C at 1MHz and 100mT.
  • the manganese-zinc ferrite materials provided by the above patents all have high-frequency characteristics, but none of them disclose the change in magnetic permeability of the high-frequency manganese-zinc ferrite material after external force is applied thereto. However, its changes will affect the application of the high-frequency manganese-zinc ferrite material. Therefore, the development of a high-frequency manganese-zinc ferrite material with low stress sensitivity and low loss has very important theoretical and practical significance.
  • Embodiments of the present application provide a low stress-sensitive high-frequency manganese-zinc ferrite material and a preparation method thereof.
  • This application reduces the magnetostriction coefficient of the material itself and the stress-sensitive performance of the material itself through a suitable proportion of the main formula; reduces material loss and improves the material temperature characteristics through a suitable additive combination and amount; and through low-temperature sintering process and special
  • the cooling curve is combined with reducing the material grain size, reducing the material stress sensitivity and high-frequency loss, and preparing a low-stress-sensitive, low-loss high-frequency manganese-zinc ferrite material.
  • embodiments of the present application provide a low-stress-sensitive high-frequency manganese-zinc ferrite material, which includes a main component and an additive;
  • the main components include Fe 2 O 3 , ZnO and MnO;
  • the additives include Co 2 O 3 , CaCO 3 , Nb 2 O 5 and TiO 2 .
  • This application reduces the magnetostriction coefficient of the material itself through a suitable proportion of the main formula and reduces the stress-sensitive performance of the material itself; reduces material loss and improves the temperature characteristics of the material through a suitable additive combination and addition amount.
  • the auxiliary additive selected in this application has the following effects: Co3+ in the Co 2 O 3 has a positive K 1 (magnetocrystalline anisotropy constant) to compensate for the negative K 1 value of the manganese-zinc ferrite, reducing the magnetic field. hysteresis loss and improve material temperature performance;
  • the CaCO 3 has the effect of increasing the grain boundary resistivity of the material and reducing the eddy current loss
  • the Nb 2 O 5 can promote the densification process during the sintering process, improve grain uniformity and reduce gas holes to reduce hysteresis loss, and form a high resistivity layer at the grain boundary to reduce material eddy current loss;
  • the TiO 2 can form local Ti 4+ -Fe 2+ ion pairs in the material, inhibit the electronic transition between Fe 2+ and Fe 3+ , increase the resistance at room temperature inside the grain, and reduce the eddy current loss at room temperature, and Provide additional cation holes for the diffusion of Nb 2 O 5 , further promoting the effect of Nb 2 O 5 .
  • the main component raw material includes: 52 to 53 mol% Fe 2 O 3 based on the percentage of the total material amount, for example, it can be 52 mol%, 52.2 mol%, 52.4 mol%, 52.6 mol%, 52.8 mol% Or 53 mol%, but not limited to the listed values, other unlisted values within the numerical range are also applicable; 6 to 7 mol% ZnO, for example, can be 6 mol%, 5.2 mol%, 6.4 mol%, 6.6 mol%, 6.8 mol % or 7 mol%, but not limited to the listed values, other unlisted values within the value range are also applicable; the balance is MnO.
  • the additives include: as a percentage of the total mass of the main component:
  • the content of Co 2 O 3 is 1500 to 3000 ppm, for example, it can be 1500 ppm, 2000 ppm, 2500 ppm or 3000 ppm, but is not limited to the listed values.
  • Other unlisted values within the numerical range are also applicable;
  • the content of CaCO 3 is 600 ⁇ 1000ppm, for example, it can be 600ppm, 700ppm, 800ppm, 900ppm or 1000ppm, but is not limited to the listed values.
  • Other unlisted values within the numerical range are also applicable;
  • the content of Nb 2 O 5 is 100 ⁇ 300ppm, for example It can be 100ppm, 150ppm, 200ppm, 250ppm or 300ppm, but is not limited to the listed values.
  • the content of TiO 2 is 1000 ⁇ 3000ppm, for example, it can be 1000ppm, 1500ppm, 2000ppm , 2500ppm or 3000ppm, but not limited to the listed values, other unlisted values within the value range are also applicable.
  • embodiments of the present application provide a method for preparing a low stress-sensitive high-frequency manganese-zinc ferrite material as described in the first aspect.
  • the preparation method includes the following steps:
  • step (2) Mix the additives and the calcined material obtained in step (1), perform secondary sanding and drying to obtain sanding powder;
  • step (3) The sanded powder described in step (2) is sequentially screened, granulated, shaped and sintered to obtain the low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the main components are first mixed to make them evenly mixed, and then a pre-calcination process is performed to grow a partial spinel structure.
  • Appropriate additives are then added to the pre-calcined product and secondary ball milling is performed. Make its powder reach the appropriate particle size range.
  • This application cannot mix the main components and additives at one time to prevent the grains from growing too large and difficult to grind after the main components and additives are pre-fired. Furthermore, mixing at one time will cause the problem of inaccurate additive content.
  • the method can make the content of each component of the additive accurate.
  • the primary sanding process in step (1) includes: adding the main component and water into a sand mill to perform primary sanding.
  • the mass ratio of the main component to water is 1: (1.2-2.5), for example, it can be 1:1.2, 1:1.4, 1:1.6, 1:1.8, 1:2, 1:2.2 or 1: 2.5, but not limited to the listed values, other unlisted values within the value range are also applicable.
  • the time for one sanding step in step (1) is 1 to 3 hours, for example, it can be 1 hour, 1.4 hours, 1.8 hours, 2.2 hours, 2.6 hours or 3 hours, but is not limited to the listed values, other values within the range The same applies to non-enumerated values.
  • the pre-calcination temperature in step (1) is 750-850°C, for example, it can be 750°C, 760°C, 770°C, 780°C, 790°C, 800°C, 810°C, 820°C, 830°C, 840°C or 850°C, but not limited to the listed values, other unlisted values within the value range are also applicable.
  • the pre-burning time in step (1) is 1 to 3 hours, for example, it can be 1 hour, 1.4 hours, 1.8 hours, 2.2 hours, 2.6 hours or 3 hours, but is not limited to the listed values. Other values not listed are also applicable.
  • the precalcining atmosphere in step (1) is air atmosphere.
  • the pre-calcination temperature described in this application needs to be in the range of 750-850°C. If the pre-calcination temperature is too high, the grains will grow too large, making it difficult to grind to a suitable particle size range within a specific time; if the pre-calcination temperature is too low , the powder activity is too high, the uniformity of the grain size after sintering is poor, the product has more pores, and the product performance is poor.
  • the additives in step (2) include Co 2 O 3 , CaCO 3 , Nb 2 O 5 and TiO 2 ;
  • the added amount of Co 2 O 3 in the additive is 1500 to 3000 ppm of the total mass of the main component, for example, it can be 1500 ppm, 2000 ppm, 2500 ppm or 3000 ppm, but is not limited to the listed values. Other values are not within the range of the values. The same applies to the listed values.
  • the amount of CaCO 3 added in the additive is 600 to 1000 ppm of the total mass of the main component.
  • it can be 600 ppm, 800 ppm or 1000 ppm, but is not limited to the listed values. Other unlisted values within the value range are the same. Be applicable.
  • the amount of Nb 2 O 5 added in the additive is 100 to 300 ppm based on the total mass of the main component.
  • it can be 100 ppm, 150 ppm, 200 ppm, 250 ppm or 300 ppm, but is not limited to the listed values. Within the range of values Other values not listed are also applicable.
  • the amount of TiO 2 added in the additive is 1000 to 3000 ppm of the total mass of the main component, for example, it can be 1000 ppm, 1500 ppm, 2000 ppm, 2500 ppm or 3000 ppm, but is not limited to the listed values. Other values are not within the range of the values. The same applies to the listed values.
  • the secondary sanding time in step (2) is 2 to 4 hours, for example, it can be 2 hours, 2.4 hours, 2.8 hours, 3.2 hours, 3.6 hours or 4 hours, but is not limited to the listed values. Other values not listed are also applicable.
  • the grain size Other values not listed within are also applicable.
  • the mesh used for sieving in step (3) is 30 to 80 mesh, for example, it can be 30 mesh, 40 mesh, 50 mesh, 60 mesh, 70 mesh or 80 mesh, but is not limited to those listed. Numerical values, other unlisted values within the numerical range are also applicable.
  • a granulating agent is added to the granulation in step (3).
  • the granulating agent includes PVA and/or PVB.
  • the added amount of the granulating agent is 8 to 15% of the mass of the sanding powder described in step (2), for example, it can be 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%, but not limited to the listed values, and other unlisted values within the value range are also applicable.
  • the forming in step (3) includes making the product obtained after granulation into a standard sample ring blank.
  • the size of the standard sample ring blank is 12.5mm ⁇ 7.5mm ⁇ 7mm.
  • the sintering process in step (3) includes: heating the standard sample ring blank to a first temperature in a balanced oxygen partial pressure atmosphere, keeping it warm, then cooling it to a second temperature at a first cooling rate, keeping it warm, and finally Cool to the third temperature at the second cooling rate.
  • the heating rate of the temperature rise is 1 to 3°C/min, for example, it can be 1°C/min, 1.5°C/min, 2°C/min, 2.5°C/min or 3°C/min, but is not limited to those listed.
  • the value of , other values within the range are not listed The same values mentioned above apply.
  • the first temperature is 950-1100°C, for example, it can be 950°C, 1000°C, 1020°C, 1040°C, 1060°C, 1080°C or 1100°C, but is not limited to the listed values, other values within the range The same applies to non-enumerated values.
  • the holding time at the first temperature is 3 to 7 hours, for example, it can be 3h, 3.5h, 4h, 4.5h, 5h, 5.5h, 6h, 6.5h or 7h, but is not limited to the listed values. The same applies to other values within the range not listed.
  • the first cooling rate is 2.5-5°C/min, for example, it can be 2.5°C/min, 3°C/min, 3.5°C/min, 4°C/min, 4.5°C/min or 5°C/min, However, it is not limited to the listed values, and other unlisted values within the numerical range are also applicable.
  • the second temperature is 250-300°C, for example, it can be 250°C, 260°C, 270°C, 280°C, 290°C or 300°C, but is not limited to the listed values. Other values within the range of the values are not listed. The same applies to numerical values.
  • the holding time at the second temperature is 3 to 5 hours, for example, it can be 3 hours, 3.5 hours, 4 hours, 4.5 hours or 5 hours, but is not limited to the listed values, and other unlisted values within the numerical range are also applicable.
  • the second cooling rate is 0.1-0.5°C/min, for example, it can be 0.1°C/min, 0.2°C/min, 0.3°C/min, 0.4°C/min or 0.5°C/min, but is not limited to those listed. value, other unlisted values within the value range are also applicable.
  • the third temperature is 40-80°C, for example, it can be 40°C, 50°C, 60°C, 70°C or 80°C, but is not limited to the listed values, and other unlisted values within the numerical range are also applicable. ; Preferably 50 to 70°C.
  • the reaction process during the heating process from 850°C to the first temperature is: MnMn 2 O 4 +Fe 2 O 3 ⁇ MnFe 2 O 4 +O 2 ;
  • the reaction process during the heat preservation process is Fe 2 O 3 ⁇ FeFe 2 O 4 +O 2 .
  • the oxygen content is different, the FeFe 2 O 4 content is different, the material K 1 (magnetocrystalline anisotropy constant) is different, and the properties are different; in the segmented cooling process, in the first cooling process, according to the equilibrium oxygen partial pressure formula, set Determine the oxygen partial pressure at each temperature point to maintain the required content of FeFe 2 O 4 in the manganese-zinc ferrite.
  • the Co 2+ ions in the ferrite change from a metastable state to a low energy level. Stability and reduced material loss.
  • the preparation method of the low stress-sensitive high-frequency manganese-zinc ferrite material described in the second aspect of the present application includes the following steps:
  • step (2) Mix the additives and the calcined material obtained in step (1), perform secondary sanding for 2 to 4 hours, and dry to obtain sanded powder with a particle size X50 of 0.8 to 1.2 ⁇ m;
  • the additives include based on the total mass of main components: 1500-3000ppm Co 2 O 3 600-1000ppm CaCO 3 , 100-300ppm Nb 2 O 5 and 1000-3000ppm TiO 2 ;
  • step (3) Pass the sanded powder described in step (2) through a 30-80 mesh sieve, granulate and shape it to obtain a standard sample ring blank with a size of 12.5mm ⁇ 7.5mm ⁇ 7mm, and obtain the low stress-sensitive ring blank after sintering.
  • High frequency manganese zinc ferrite material
  • the sintering process includes: in a balanced oxygen partial pressure atmosphere, the standard sample ring blank is heated to 950-1100°C at a heating rate of 1-3°C/min, maintained for 3-7 hours, and then heated to 2.5-5°C. Cool to 250 ⁇ 300°C at a cooling rate of /min, keep warm for 3 ⁇ 5 hours, and finally cool to 40 ⁇ 80°C at a cooling rate of 0.1 ⁇ 0.5°C/min.
  • the low stress-sensitive high-frequency manganese-zinc ferrite material provided by the embodiments of the present application has low stress sensitivity. After applying a pressure of 10 MPa to the ferrite material, its magnetic permeability changes by less than 5%. .
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material includes the following steps:
  • step (2) Mix the additives and the calcined material obtained in step (1), conduct secondary sand grinding for 2 hours, and obtain sand-ground powder with a particle size X50 of 1 ⁇ m after drying;
  • the additives include, based on the total mass of main components: 3000ppm Co 2 O 3 , 1000 ppm CaCO 3 , 100 ppm Nb 2 O 5 and 2000 ppm TiO 2 ;
  • step (3) Pass the sanded powder described in step (2) through a 60-mesh sieve, granulate and shape to obtain a standard sample ring blank with a size of 12.5mm ⁇ 7.5mm ⁇ 7mm. After sintering, the low-stress-sensitive high-frequency Manganese zinc ferrite material;
  • the sintering process includes: in a balanced oxygen partial pressure atmosphere, the standard sample ring blank is heated to 1060°C at a heating rate of 1.5°C/min, maintained for 7 hours, and then cooled to 280°C at a cooling rate of 2.8°C/min. °C, keep warm for 3 hours, and finally cool to 50 °C at a cooling rate of 0.1 °C/min.
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material includes the following steps:
  • step (2) Mix the additives and the calcined material obtained in step (1), conduct secondary sanding for 4 hours, and dry to obtain sanding powder with a particle size X50 of 0.8 ⁇ m;
  • the additives include, based on the total mass of main components: 1500ppm Co 2 O 3 600ppm CaCO 3 , 300ppm Nb 2 O 5 and 3000ppm TiO 2 ;
  • step (3) Pass the sanded powder described in step (2) through a 60-mesh sieve, granulate and shape to obtain a standard sample ring blank with a size of 12.5mm ⁇ 7.5mm ⁇ 7mm. After sintering, the low-stress-sensitive high-frequency Manganese-zinc ferrite material;
  • the sintering process includes: in a balanced oxygen partial pressure atmosphere, the standard sample ring blank is heated to 950°C at a heating rate of 1.5°C/min, maintained for 7 hours, and then cooled to 300°C at a cooling rate of 2.5°C/min. °C, keep warm for 3 hours, and finally cool to 80 °C at a cooling rate of 0.1 °C/min.
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material includes the following steps:
  • step (2) Mix the additives and the calcined material obtained in step (1), conduct secondary sand grinding for 2 hours, and obtain sand-ground powder with a particle size X50 of 1 ⁇ m after drying;
  • the additives include, based on the total mass of main components: 3000ppm Co 2 O 3 , 1000 ppm CaCO 3 , 100 ppm Nb 2 O 5 and 1000 ppm TiO 2 ;
  • step (3) Pass the sanded powder described in step (2) through a 60-mesh sieve, granulate and shape to obtain a standard sample ring blank with a size of 12.5mm ⁇ 7.5mm ⁇ 7mm. After sintering, the low-stress-sensitive high-frequency Manganese zinc ferrite material;
  • the sintering process includes: in a balanced oxygen partial pressure atmosphere, the standard sample ring blank is heated to 1100°C at a heating rate of 1.5°C/min, maintained for 7 hours, and then cooled to 250°C at a cooling rate of 2.8°C/min. °C, keep warm for 3 hours, and finally cool to 40 °C at a cooling rate of 0.1 °C/min.
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the only difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Embodiment 1 is that: this embodiment will The first sintering temperature in step (3) was changed to 1135°C.
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the only difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Embodiment 1 is that: this embodiment will The first sintering temperature in step (3) is changed to 1100°C.
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the only difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Embodiment 1 is that: this embodiment will step (3) The second cooling rate of sintering is changed to 1°C/min.
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the only difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Embodiment 1 is that: this embodiment will The contents of the main components described in step (1) are changed to: 52.5 mol% Fe 2 O 3 , 6.3 mol% ZnO, and the balance is MnO.
  • This embodiment provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the only difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Embodiment 1 is that: this embodiment will The content of the additives described in step (2) is changed to include, based on the total mass of the main components: 2000 ppm Co 2 O 3 , 1000 ppm CaCO 3 , 100 ppm Nb 2 O 5 and 1000 ppm TiO 2 .
  • This comparative example provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Example 1 is only that: this comparative example will The content of ZnO described in step (1) was changed to 5 mol%.
  • This comparative example provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the only difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Example 1 is that: this comparative example omits Add Co 2 O 3 in the additive described in step (2).
  • This comparative example provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the only difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Example 1 is that: this comparative example omits Add TiO 2 in the additive described in step (2).
  • This comparative example provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Example 1 is only that: this comparative example will The amount of Co 2 O 3 in the additive described in step (2) was changed to 3500 ppm.
  • This comparative example provides a low stress-sensitive high-frequency manganese-zinc ferrite material.
  • the difference between the preparation method of the low-stress-sensitive high-frequency manganese-zinc ferrite material and Example 1 is only that: this comparative example will step (2)
  • the amount of TiO2 in the additive is changed to 3500ppm.
  • the magnetic permeability and the magnetic permeability under an external uniform pressure of 10Mpa were tested. The results are shown in Table 1.
  • Example 1 (1) Analysis of Example 1 and Comparative Example 1 shows that the ZnO content in the ferrite material is too low, the overall magnetic permeability decreases, and the influence of stress on the magnetic permeability increases;
  • Example 1 shows that the cooling section cools down quickly during the sintering process, and the overall power consumption of the material becomes worse;
  • Example 1 Analysis of Example 1 and Comparative Example 4 shows that the addition of excessive Co2O3 will make the overall power consumption of the material worse and the magnetic permeability lowered.
  • Example 1 Analysis of Example 1 and Comparative Example 5 shows that the addition of excessive TiO2 will worsen the high-temperature power consumption of the material, lower the magnetic permeability, and worsen the stress performance.
  • the low stress-sensitive high-frequency manganese-zinc ferrite material provided by this application can reduce the magnetostriction coefficient of the material itself through the appropriate main formula ratio, and reduce the stress-sensitive performance of the material itself; through appropriate additives
  • the combination and addition amount reduce material loss and improve material temperature characteristics; after applying a pressure of 10MPa to the ferrite material, its magnetic permeability changes by less than 5%.

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Abstract

Le présent texte divulgue un matériau de ferrite de manganèse-zinc haute fréquence à faible sensibilité à la contrainte et un procédé de préparation associé. Le matériau de ferrite de manganèse-zinc haute fréquence à faible sensibilité à la contrainte comprend : des composants principaux et des additifs, les composants principaux comprenant Fe2O3, ZnO et MnO, les additifs comprenant Co2O3, CaCO3, Nb2O5 et TiO2. Dans la présente demande, les rapports de formule principaux appropriés réduisent le coefficient de magnétostriction du matériau, réduisant les caractéristiques de sensibilité à la contrainte du matériau ; la combinaison d'additifs appropriée et les quantités d'ajout réduisent la perte de matériau et améliorent les propriétés de température de matériau ; et une combinaison de frittage à basse température et d'une courbe de refroidissement spéciale réduit la taille de grain du matériau, réduit la sensibilité à la contrainte et la perte haute fréquence du matériau, et permet d'obtenir un matériau de ferrite de manganèse-zinc haute fréquence présentant une faible sensibilité à la contrainte et une faible perte.
PCT/CN2023/112106 2022-08-12 2023-08-10 Matériau de ferrite de manganèse-zinc haute fréquence à faible sensibilité à la contrainte, et procédé de préparation associé WO2024032684A1 (fr)

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