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CN-122010545-A - MnZn ferrite material with wide temperature range, low loss and high Bs and preparation method and application thereof

CN122010545ACN 122010545 ACN122010545 ACN 122010545ACN-122010545-A

Abstract

The invention provides a MnZn ferrite material with wide temperature range, low loss and high Bs, a preparation method and application thereof, wherein the MnZn ferrite material comprises a main component and an additive, the main component comprises, by mole percent, fe 2 O 3 52.85-53.15mol%, mnO 37.40-37.90mol% and the balance ZnO, and the additive comprises any one or a combination of at least two of CaCO 3 、Nb 2 O 5 and Co 2 O 3 . According to the invention, the proportion of Fe 2 O 3 and MnO in the MnZn ferrite material and the sintering process are reasonably controlled, so that a single valley point of the traditional MnZn ferrite material is changed, and finally the MnZn ferrite material with wide temperature, low loss and high Bs is prepared, thereby better meeting the requirements of energy conservation, emission reduction and improvement of the working efficiency of electronic components and facilitating large-scale popularization and application.

Inventors

  • LV DONGHUA
  • ZHANG LIKANG
  • JIN JIJUN

Assignees

  • 横店集团东磁股份有限公司
  • 金华市磁盟知识产权服务有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. A MnZn ferrite material with wide temperature range, low loss and high Bs is characterized by comprising a main component and an additive; the main components comprise the following components in mole percent: Fe 2 O 3 52.85-53.15mol%; MnO 37.40-37.90mol%; The balance of ZnO; The additive comprises any one or a combination of at least two of CaCO 3 、Nb 2 O 5 or Co 2 O 3 .
  2. 2. The MnZn ferrite material according to claim 1, wherein the content of ZnO in the main component is 8.95-9.75mol% in terms of mole percent.
  3. 3. MnZn ferrite material according to claim 1 or 2, characterized in that the content of CaCO 3 in the additive is 0.05-0.15% based on the total weight of the main component as calculation basis; Preferably, the content of Nb 2 O 5 in the additive is 0.025-0.045% based on the total weight of the main component; Preferably, the content of Co 2 O 3 in the additive is 0.48-0.55% based on the total weight of the main component.
  4. 4. A method for producing the MnZn ferrite material as defined in any one of claims 1 to 3, characterized by comprising the steps of: (1) Mixing Fe 2 O 3 , mnO and ZnO, and performing primary sanding to obtain a first abrasive; (2) Mixing the glue and the first abrasive obtained in the step (1) for spray granulation to obtain a first intermediate material; (3) Presintering the first intermediate material obtained in the step (2) to obtain a presintering material; (4) Mixing the additive and the presintered material obtained in the step (3) for secondary sanding to obtain a second abrasive; (5) Mixing the glue and the second abrasive obtained in the step (4) for spray granulation to obtain a second intermediate material; (6) Pressing the second intermediate material obtained in the step (5) into a standard ring, and cooling after sintering to obtain a MnZn ferrite material; Wherein the oxygen content in the sintering in the step (6) is smaller than the oxygen content in the cooling.
  5. 5. The preparation method according to claim 4, wherein the mass ratio of the water in the balls subjected to primary sanding in the step (1) is 1 (4-8) (0.5-0.6); preferably, the time of the primary sanding in the step (1) is 60-80min; preferably, the glue of step (2) comprises a polyvinyl alcohol as a component; preferably, the concentration of the glue in the step (2) is 7-8wt%; preferably, the glue of step (2) is mixed in an amount of 8-12% based on the weight of the first abrasive.
  6. 6. The method according to claim 4 or 5, wherein the pre-firing temperature in step (3) is 900 to 920 ℃; Preferably, the presintering time in the step (3) is 60-180min; preferably, the pre-sintering in step (3) is performed in a rotary kiln.
  7. 7. The method according to any one of claims 4 to 6, wherein the secondary sand grinding in step (4) has a ball water mass ratio of 1 (4-8): 0.4-0.5; Preferably, the time of the primary sanding in the step (4) is 60-80min; preferably, the glue of step (5) comprises a polyvinyl alcohol as a component; Preferably, the concentration of the glue in the step (5) is 7-8wt%; preferably, the glue of step (5) is mixed in an amount of 8-12% based on the weight of the second abrasive.
  8. 8. The method of any one of claims 4-7, wherein the sintering temperature of step (6) is 1290-1300 ℃; preferably, the sintering time in the step (6) is 30-40min; preferably, the oxygen content is 0-1% when the sintering time is not more than 30min, and 3-5% when the sintering time is more than 30 min; preferably, the sintering of step (6) is performed in a bell jar furnace; preferably, the oxygen content is 1-1.5% when the temperature of the reduced temperature is below 1150 ℃.
  9. 9. The preparation method according to any one of claims 4 to 8, characterized in that the preparation method comprises the steps of: (1) Mixing Fe 2 O 3 , mnO and ZnO, performing primary sanding for 60-80min, and controlling the mass ratio of the ball water to 1 (4-8) (0.5-0.6) to obtain a first abrasive; (2) Spraying and granulating the polyvinyl alcohol glue with the mixed concentration of 7-8wt% and the first abrasive obtained in the step (1) to obtain a first intermediate material, wherein the mixed amount of the polyvinyl alcohol glue is 8-12% by taking the weight of the first abrasive as a calculation reference; (3) Placing the first intermediate material obtained in the step (2) into a rotary kiln, and presintering for 60-180min at 900-920 ℃ to obtain a presintering material; (4) Mixing the additive and the presintered material obtained in the step (3) for secondary sanding for 60-80min, and controlling the mass ratio of the ball water to 1 (4-8) (0.4-0.5) to obtain a second abrasive; (5) Spraying and granulating the polyvinyl alcohol glue with the mixed concentration of 7-8wt% and the second abrasive obtained in the step (4) to obtain a second intermediate material, wherein the mixed amount of the polyvinyl alcohol glue is 8-12% by taking the weight of the second abrasive as a calculation reference; (6) Pressing the second intermediate material obtained in the step (5) into a standard ring, placing the standard ring in a bell jar furnace, sintering the standard ring for 30-40min at 1290-1300 ℃, and cooling the standard ring to obtain a MnZn ferrite material; wherein the oxygen content in the step (6) is smaller than the oxygen content in the cooling process, the oxygen content is 0-1% when the sintering time is not more than 30min, the oxygen content is 3-5% when the sintering time is more than 30min, and the oxygen content is 1-1.5% when the cooling temperature is lower than 1150 ℃.
  10. 10. Use of a MnZn ferrite material as defined in any one of claims 1-3 for manufacturing micro-motors, filters or sensors.

Description

MnZn ferrite material with wide temperature range, low loss and high Bs and preparation method and application thereof Technical Field The invention belongs to the technical field of ferrite materials, relates to a MnZn ferrite material, and particularly relates to a MnZn ferrite material with wide temperature range, low loss and high Bs, and a preparation method and application thereof. Background At present, electronic devices are continuously developed in the direction of miniaturization, light weight and high efficiency, so that a magnetic material with a higher saturation magnetic flux density (Bs) is required to achieve high power density of a magnetic device, and a lower loss is required to achieve high efficiency of the magnetic device. Particularly in recent years, electronic devices are focusing on efficiency under light load, and it is required to combine the characteristics of wide temperature range, low loss and high Bs for magnetic materials. However, the existing MnZn ferrite material does not have the three characteristics, namely, if Bs are increased, the loss is generally increased, or if the loss is reduced, the Bs are generally reduced, or the wide-temperature characteristic is not provided at all. For example, CN116283263A discloses a MnZn ferrite material with Bs at 100 ℃ being 409mT and only a single valley point being 100 ℃ and not a wide temperature material, CN101429016A discloses a MnZn ferrite material with Bs at 100 ℃ being 460mT (10 kHz 1200A/m), loss of 367-385kW/m 3 at 100kHz 200mT and only a single valley point being 100 ℃ and not a wide temperature material, and CN1890197A discloses a ferrite sintered body with Bs at 100 ℃ being 490mT (1000A/m) and only a single valley point being 100 ℃ and not a wide temperature material, but the loss of the ferrite sintered body is as high as 1089kW/m 3 at 50kHz 150 mT. Therefore, how to provide a MnZn ferrite material with wide temperature range, low loss and high Bs and a preparation method thereof, which better meet the requirements of energy conservation, emission reduction and improvement of the working efficiency of electronic components, becomes a urgent problem to be solved by the current technicians in the field. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide the MnZn ferrite material with wide temperature range, low loss and high Bs, the preparation method and the application thereof, the proportion of Fe 2O3 and MnO in the MnZn ferrite material and the sintering process are reasonably controlled, the single valley point of the traditional MnZn ferrite material is changed, and finally the MnZn ferrite material with wide temperature range, low loss and high Bs is prepared, thereby better meeting the requirements of energy conservation, emission reduction and improvement of the working efficiency of electronic components and being beneficial to large-scale popularization and application. To achieve the purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides a MnZn ferrite material which has the advantages of wide temperature range, low loss and high Bs, and the MnZn ferrite material consists of main components and additives. The main components comprise the following components in mole percent: Fe2O3 52.85-53.15mol%; MnO 37.40-37.90mol%; the balance being ZnO. The additives include any one or a combination of at least two of CaCO 3、Nb2O5 or Co 2O3, typically but not limited to, a combination of CaCO 3 and Nb 2O5, a combination of Nb 2O5 and Co 2O3, a combination of CaCO 3 and Co 2O3, or a combination of CaCO 3、Nb2O5 and Co 2O3. In the present invention, the content of Fe 2O3 is 52.85 to 53.15mol%, for example, 52.85mol%, 52.90mol%, 52.95mol%, 53.00mol%, 53.05mol%, 53.10mol% or 53.15mol%, but the present invention is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are equally applicable. Specifically, when the content of Fe 2O3 is less than 52.85mol%, the saturation magnetic flux density Bs of the MnZn ferrite material is significantly reduced, and when the content of Fe 2O3 is more than 53.15mol%, the eddy current loss of the MnZn ferrite material is significantly increased. In the present invention, the MnO content is 37.40 to 37.90mol%, for example, 37.40mol%, 37.45mol%, 37.50mol%, 37.55mol%, 37.60mol%, 37.65mol%, 37.70mol%, 37.75mol%, 37.80mol%, 37.85mol% or 37.90mol%, but the present invention is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are equally applicable. Specifically, when the content of MnO is lower than 37.40mol%, the eddy current loss of the MnZn ferrite material is obviously increased, and the magnetocrystalline anisotropy constant K1 is improved, and when the content of MnO is higher than 37.90mol%, the hysteresis expansion coefficient λs is obviously increased, so that the internal stress of the Mn