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A kind of low magnetic permeability ferrite magnetic medium material, its preparation method and application

A technology of magnetic medium and low magnetic permeability, applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of difficult magnetic permeability and achieve high insulation resistance

Active Publication Date: 2022-08-09
中国电子科技集团公司第九研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The magnetic permeability of the NiCuZn-based LTCF material is adjusted and controlled by the above method. Because the high magnetic permeability of the low-temperature sintered material and the low sintering temperature are a pair of contradictions, taking into account the comprehensive performance, the low-temperature sintered NiCuZn-based ferrite material currently meeting the requirements of use, its The magnetic permeability is mostly adjustable between 15 and 400, and it is quite difficult if the magnetic permeability is higher than 400 and lower than 15, especially to realize the μ i The basic requirements of ≤3 ferrite magnetic medium materials are almost impossible

Method used

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  • A kind of low magnetic permeability ferrite magnetic medium material, its preparation method and application
  • A kind of low magnetic permeability ferrite magnetic medium material, its preparation method and application
  • A kind of low magnetic permeability ferrite magnetic medium material, its preparation method and application

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Embodiment 1

[0029] A low magnetic permeability ferrite magnetic medium material, the specific composition percentages are: main component content: NiO 0.65mol%, ZnO 42.00mol%, CuO 11.00mol%, Fe 2 O 3 46.35mol%; Auxiliary component content: Co 2 O 3 0.25wt%, MnCO 3 0.20wt%, Bi 2 O 3 0.60wt%.

[0030] The preparation method is as follows:

[0031] First of all, the high-frequency vibration mixing system is used to effectively improve the mixing uniformity of the oxides of the raw materials, achieve high-speed crushing effect, complete the dry mixing, and control the mixing time to 70 minutes;

[0032] Then, further use a sintering kiln for pre-sintering, and control the pre-sintering temperature to be 890°C;

[0033] Further, the large flow circulating sand mill wet abrasive (primary abrasive for 4 hours, secondary fine abrasive for 5 hours) is used to refine the powder particles to improve the activity of the powder, reduce the activation energy of the reaction and effectively redu...

Embodiment 2

[0036] A low magnetic permeability ferrite magnetic medium material, the specific composition percentages are: main component content: NiO 0.60mol%, ZnO 43.00mol%, CuO 10.50mol%, Fe 2 O 3 45.90mol%; Auxiliary component content: Co 2 O 3 0.21wt%, MnCO 3 0.25wt%, Bi 2 O 3 0.55wt%.

[0037] The preparation method is as follows:

[0038] First, the high-frequency vibration mixing system is used to effectively improve the mixing uniformity of the oxides of each raw material, achieve high-speed crushing effect, complete dry mixing, and control the mixing time to 65 minutes;

[0039] Then, further use a sintering kiln for pre-sintering, and control the pre-sintering temperature to be 885°C;

[0040] Further, the large flow circulating sand mill wet abrasive (primary abrasive for 4 hours, secondary fine abrasive for 4.5 hours) is used to refine the powder particles to improve the activity of the powder, reduce the activation energy of the reaction and effectively reduce the sin...

Embodiment 3

[0043] A low magnetic permeability ferrite magnetic medium material, the specific composition percentages are: main component content: NiO 0.50mol%, ZnO 43.50mol%, CuO 10.00mol%, Fe 2 O 3 46.00mol%; Auxiliary component content: Co 2 O 3 0.20wt%, MnCO 3 0.30wt%, Bi 2 O 3 0.50wt%.

[0044] The preparation method is as follows:

[0045] First, the high-frequency vibration mixing system is used to effectively improve the mixing uniformity of the oxides of the raw materials, achieve high-speed crushing effect, complete dry mixing, and control the mixing time to 60 minutes;

[0046] Then, further use a sintering kiln for pre-sintering, and control the pre-sintering temperature to be 880°C;

[0047] Further, the wet abrasives of the large-flow circulating sand mill (primary abrasive for 4 hours and secondary fine abrasive for 4 hours) are used to refine the powder particles to improve the activity of the powder, reduce the activation energy of the reaction and effectively redu...

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Abstract

The invention discloses a low magnetic permeability ferrite magnetic medium material, which belongs to the technical field of ferrite materials. , ZnO (42~45) mol%, CuO (9~11) mol%, Fe 2 O 3 (45-47) mol%, the content of the auxiliary components: Co 2 O 3 (0.15~0.25)wt%, MnCO 3 (0.2~0.4)wt%, Bi 2 O 3 (0.4-0.6) wt%; the dielectric material obtained by the present invention has a magnetic permeability μ i ≤3, shrinkage rate 12~20%, sintering temperature 850~910℃, high resistivity, compatible with power nickel zinc LTCF material system, suitable for the development of ferrite magnetic medium paste, meet the requirements of ferrite magnetic medium paste High withstand voltage (breakdown voltage>1500V / 50μm), high insulation resistance (>10 12 Ω), extremely low permeability (μ i ≤3) and achieve the matching co-firing requirements of multi-heterogeneous materials such as power nickel-zinc LTCF materials and Ag conductor pastes for LTCF power devices at around 900 °C.

Description

technical field [0001] The invention relates to the technical field of ferrite materials, in particular to a low magnetic permeability ferrite magnetic medium material, a preparation method and application thereof. Background technique [0002] LTCF power device dielectric paste is the key material to realize the structure and function of LTCF power devices such as LTCF micro-magnetic transformer, power inductor, power transformer, etc. It is used to construct magnetic circuit and air gap, improve transformer coupling coefficient and enhance anti-saturation ability. The realization of power device structure and function plays a crucial role. [0003] The ferrite magnetic medium material is the key material for the development of the LTCF power device medium slurry and the realization of the slurry characteristics. It is essentially different from the conventional medium material used in the LTCC process. High withstand voltage (breakdown voltage>1500V / 50μm), high insulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/626H01F1/36H01F41/00
CPCC04B35/265C04B35/6261H01F1/344H01F1/36H01F41/00C04B2235/3279C04B2235/3284C04B2235/3281C04B2235/3275C04B2235/442C04B2235/3298C04B2235/96
Inventor 刘兴吴江孙小龙王福海
Owner 中国电子科技集团公司第九研究所
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