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CN-121974673-A - Ultralow-loss manganese zinc ferrite and preparation method thereof

CN121974673ACN 121974673 ACN121974673 ACN 121974673ACN-121974673-A

Abstract

The invention discloses ultralow-loss manganese-zinc ferrite and a preparation method thereof, and belongs to the technical field of ferrite soft magnetic materials. An ultralow-loss manganese-zinc ferrite comprises a main component, a first additive and a second additive, wherein the main component comprises Fe 2 O 3 , znO and MnO, the first additive comprises one or more of SiO 2 、TiO 2 、ZrO 2 , and the second additive comprises one or more of CaCO 3 、Co 3 O 4 、CuO、Al 2 O 3 . The invention finally realizes the comprehensive and effective reduction of the loss of the Mn-Zn ferrite core by the stepwise addition of the specific additives, and achieves the performance target of ultralow loss.

Inventors

  • YU JINGJING
  • LIU SHIHAO
  • LIU SHILIN

Assignees

  • 安徽龙磁金属科技有限公司

Dates

Publication Date
20260505
Application Date
20251231

Claims (10)

  1. 1. An ultralow-loss manganese-zinc ferrite is characterized by comprising the following raw materials of a main component, a first additive and a second additive; The main components comprise Fe 2 O 3 , znO and MnO; The first additive comprises one or more of SiO 2 、TiO 2 、ZrO 2 ; The second additive comprises one or more of CaCO 3 、Co 3 O 4 、CuO、Al 2 O 3 .
  2. 2. The ultralow-loss manganese-zinc-ferrite according to claim 1, wherein the purity of the raw material of the main component should be not lower than 98mol%; The main components are 53-54.5mol% of Fe 2 O 3 , 8.5-9.5mol% of ZnO and the balance of MnO.
  3. 3. The ultralow-loss manganese-zinc ferrite according to claim 1, wherein the first additive is added with SiO 2 and TiO 2 simultaneously, wherein the addition amount of SiO 2 is 20-50 ppm, the addition amount of TiO 2 is 150-300 ppm, and the addition amount of TiO 2 is 5-10 times that of SiO 2 .
  4. 4. The ultralow-loss manganese-zinc-ferrite according to claim 1, wherein CaCO 3 and Co 3 O 4 in the second additive are required to be added simultaneously, wherein the addition amount of CaCO 3 is 200-400 ppm, the addition amount of Co 3 O 4 is 50-100 ppm, and the addition amount of CaCO 3 is 5-10 times that of Co 3 O 4 .
  5. 5. A method for preparing the ultralow-loss manganese-zinc ferrite according to any one of claims 1 to 4, comprising the steps of: ball milling, sintering, ball milling, granulating, forming and sintering.
  6. 6. The method for preparing the ultralow-loss manganese-zinc ferrite according to claim 5, wherein the specific steps of one ball milling are as follows: And weighing the main components and the first additive according to the required proportion, putting into a ball mill, ball milling for 0.5-3 hours to obtain slurry, and drying the slurry to obtain primary ball milling powder.
  7. 7. The method for preparing ultralow-loss manganese-zinc ferrite according to claim 5, wherein the specific steps of primary sintering are as follows: And heating the primary ball-milling powder to 800-900 ℃ at the speed of 200-300 ℃ per hour in an air atmosphere, preserving heat for 1-2 hours, and cooling along with a furnace to obtain primary sintering powder.
  8. 8. The method for preparing ultralow-loss manganese-zinc ferrite according to claim 5, wherein the specific steps of secondary ball milling are as follows: and adding a second additive into the primary sintering powder in proportion, putting into a ball mill again, ball milling for 1-5 h, and drying the obtained slurry to obtain secondary ball milling powder.
  9. 9. The method for preparing ultralow-loss manganese-zinc ferrite according to claim 5, wherein the granulating comprises the following specific steps: Adding 8-10wt% of polyvinyl alcohol aqueous solution based on the total weight of the secondary ball milling powder, wherein the concentration of the polyvinyl alcohol aqueous solution is 8-10wt% and performing high-speed centrifugal granulation to obtain particles; The specific steps of the molding are as follows: the granulated granules were pressed into magnetic rings of T25 x 15 x 7.5.
  10. 10. The method for preparing ultralow-loss manganese-zinc ferrite according to claim 5, wherein the specific steps of secondary sintering are as follows: Sintering in a bell jar furnace by adopting balanced oxygen partial pressure, heating the temperature from normal temperature to 1100-1350 ℃ for 1-6 hours, preserving heat for 0.5-5 hours at the highest temperature, controlling the oxygen partial pressure in the sintering atmosphere to be 0.5% -4%, and cooling the atmosphere to be the balanced oxygen partial pressure of different temperatures, and reducing the temperature from the highest temperature to 100-300 ℃ for 10-20 hours to obtain the manganese zinc ferrite.

Description

Ultralow-loss manganese zinc ferrite and preparation method thereof Technical Field The invention relates to the technical field of ferrite soft magnetic materials, in particular to ultralow-loss manganese zinc ferrite and a preparation method thereof. Background In recent years, with the increasing demands of new energy sources, automobile electronics, 5G, big data, internet of things and other new infrastructure application fields, the performance requirements on the power type manganese zinc ferrite are also higher and higher. The existing power type ferrite is difficult to meet the increasingly severe performance requirements, and the development of new ferrite products with lower loss becomes a common pursuit of various manufacturers. However, the loss (especially the high-frequency eddy current loss) of the existing power ferrite is still too high under the high-frequency, high-power density and wide-temperature working scenes, and the existing power ferrite becomes a key bottleneck for limiting the efficiency and the power density of the power module. Disclosure of Invention The invention provides an ultralow-loss manganese-zinc ferrite and a preparation method thereof, which can solve the problem that the loss of the power ferrite is still too high under the working scenes of high frequency, high power density and wide temperature in the prior art. The aim of the invention can be achieved by the following technical scheme: in a first aspect, the invention provides an ultralow-loss manganese-zinc ferrite, which comprises the following raw materials of a main component, a first additive and a second additive; The main components comprise Fe 2O3, znO and MnO; The first additive comprises one or more of SiO 2、TiO2、ZrO2; The second additive comprises one or more of CaCO 3、Co3O4、CuO、Al2O3. Further, the purity of the raw material of the main component should be not less than 98mol%. Further, the main component comprises 53-54.5 mol% of Fe 2O3, 8.5-9.5 mol% of ZnO and the balance of MnO. Further, the first additive needs to be added with SiO 2 and TiO 2 at the same time, wherein the addition amount of SiO 2 is 20-50 ppm, the addition amount of TiO 2 is 150-300 ppm, and the addition amount of TiO 2 is 5-10 times that of SiO 2. Further, caCO 3 and Co 3O4 in the second additive need to be added simultaneously, wherein the adding amount of CaCO 3 is 200-400 ppm, the adding amount of Co 3O4 is 50-100 ppm, and the adding amount of CaCO 3 is 5-10 times that of Co 3O4. In a second aspect, the invention provides a method for preparing ultralow-loss manganese-zinc ferrite, comprising the following steps: ball milling, sintering, ball milling, granulating, forming and sintering. Further, the specific steps of the primary ball milling are as follows: And weighing the main components and the first additive according to the required proportion, putting into a ball mill, ball milling for 0.5-3 hours to obtain slurry, and drying the slurry to obtain primary ball milling powder. Further, the specific steps of the primary sintering are as follows: And heating the primary ball-milling powder to 800-900 ℃ at the speed of 200-300 ℃ per hour in an air atmosphere, preserving heat for 1-2 hours, and cooling along with a furnace to obtain primary sintering powder. Further, the specific steps of the secondary ball milling are as follows: and adding a second additive into the primary sintering powder in proportion, putting into a ball mill again, ball milling for 1-5 h, and drying the obtained slurry to obtain secondary ball milling powder. Further, the granulating comprises the following specific steps: According to the total weight of the secondary ball milling powder, adding 8-10wt% of polyvinyl alcohol aqueous solution of the total weight of the powder, wherein the concentration of the polyvinyl alcohol aqueous solution is 8-10wt%, and performing high-speed centrifugal granulation to obtain particles. Further, the specific steps of the molding are as follows: the granulated granules were pressed into magnetic rings of T25 x 15 x 7.5. Further, the secondary sintering comprises the following specific steps: Sintering in a bell jar furnace by adopting balanced oxygen partial pressure, heating the temperature from normal temperature to 1100-1350 ℃ for 1-6 hours, preserving heat for 0.5-5 hours at the highest temperature, controlling the oxygen partial pressure in the sintering atmosphere to be 0.5% -4%, and cooling the atmosphere to be the balanced oxygen partial pressure of different temperatures, and reducing the temperature from the highest temperature to 100-300 ℃ for 10-20 hours to obtain the manganese zinc ferrite. The invention has the beneficial effects that: 1. The ultralow-loss manganese-zinc ferrite disclosed by the invention takes Fe 2O3, znO and MnO as main components, and is matched with a first additive containing SiO 2、TiO2、ZrO2 and a second additive containing CaCO 3、Co3O4、CuO、Al2O3 for use, and the two additives per