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High performance soft magnetic ferrite materials doped with Ni-Zn series and preparation method thereof

A soft magnetic material and ferrite technology, applied in the field of high-performance doped nickel-zinc ferrite soft magnetic material and its preparation, can solve the problems of no signal, magnetic core burst, temperature rise, etc., and achieve a simple process. , the effect of light weight and low production cost

Active Publication Date: 2010-02-03
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Claims
  • Application Information

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Problems solved by technology

However, if ordinary high-frequency Ni-Zn ferrite cores are used in high-frequency and large-field applications, when the current passing through the core coil reaches the ampere level, the temperature will rise sharply due to the increased loss and heat generation of the core. Magnetic cores are prone to "burst" or fail the signal

Method used

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  • High performance soft magnetic ferrite materials doped with Ni-Zn series and preparation method thereof
  • High performance soft magnetic ferrite materials doped with Ni-Zn series and preparation method thereof
  • High performance soft magnetic ferrite materials doped with Ni-Zn series and preparation method thereof

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preparation example Construction

[0032]The preparation method comprises the following process steps and contents:

[0033] (1) Weigh raw materials according to the design composition of the Ni-Zn series ferrite soft magnetic material, and add 0-10 wt% of dispersant and binder.

[0034] (2) Mix the claimed powder with high-purity and high-wear-resistant zirconia grinding media and deionized water in a polyurethane ball mill tank, grind and mix evenly on a high-energy ball mill.

[0035] (3) Dry the finely mixed slurry in a drying oven.

[0036] (4) Grind the dried powder, mix and granulate.

[0037] (5) Select a sieve with a suitable aperture and mesh number to sieve the mixed and granulated powder.

[0038] (6) Dry press the ground powder in a mold with specified specifications and shapes.

[0039] (7) Synthesize and sinter the ferrite soft magnetic material according to the preset sintering system.

[0040] In the ball mill, the grinding media are high-purity and high-wear-resistant zirconia balls with a...

Embodiment 1

[0047] Embodiment 1: commercially available analysis pure ZnO, NiO, Fe 2 o 3 、 Bi 2 o 3 , MnCO 3 、Al 2 o 3 For mixing, ZnO, NiO, Fe 2 o 3 、Al 2 o 3 The molar ratio ratio is ZnO:NiO:Fe 2 o 3 : Al 2 o 3 =49.40:25.00:25.00:0.60, with respect to the total weight of other components, 1.0 wt% of Bi was added 2 o 3 and 2.0wt% MnCO 3 , and added 0.3wt% polyvinyl alcohol and 0.05wt% Davon C. According to the powder of 1:4:2: grinding ball: deionized water (mass ratio) into the polyurethane ball mill tank, after ball milling on the ball mill for 24 hours, dry in the air at 130°C in a drying oven for 24 hours , after being ground and sieved, dry-pressed into a ring shape, sintered at 1175°C for 2 hours, kept at 300°C for 2 hours, with a heating rate of 2°C / min, and cooled with the furnace.

[0048] The resulting material is a phase-pure spinel ferrite (see figure 1 ), the grain size is relatively uniform (see figure 2 ), the initial permeability μ at a frequency of 1M...

Embodiment 2

[0049] Embodiment 2: commercially available analysis pure ZnO, NiO, Fe 2 o 3 、 Bi 2 o 3 , MnCO 3 、Pr 6 o 11 For mixing, ZnO, NiO, Fe 2 o 3 、Pr 6 o 11 The molar ratio ratio is ZnO:NiO:Fe 2 o 3 :Pr 6 o 11 =49.33:25.17:25.17:0.34, with respect to the total weight of other components, 1.0 wt% of Bi was added 2 o 3 and 2.0wt% MnCO 3 , and added 0.3wt% polyvinyl alcohol and 0.05wt% Davon C. According to the mass ratio of 1:4:2 powder: zirconium ball: deionized water, put it into the polyurethane ball mill tank, after ball milling on the ball mill for 24 hours, dry in the air at 130°C in a drying oven for 24 hours, after grinding , dry pressed into a ring, sintered at 1150°C for 2 hours, kept at 300°C for 2 hours, the heating rate was 2°C / min, and cooled with the furnace. The resulting material is a typical two-phase structure (comprising a spinel phase and a phase mainly composed of praseodymium ferrite, see figure 1 ), the grain size is relatively uniform (see f...

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Abstract

The invention relates to a high performance soft magnetic ferrite material doped with Ni-Zn series and a preparation method thereof, belonging to the technical field of electronic ceramic preparationand application. The main components of the material comprise 47.0-50.0 mol% of Fe2O3, 24.0-26.0 mol% of ZnO and 24.0-26.0 mol% of NiO; the extra assistant components comprise 0.5-5.0 wt% of Bi2O3 and0.5-5.0 wt% of MnCO3 and at least one of the following doped components: 0-75 mol% of Al2O3, 0.1-10 mol% of Pr6O11 and 0.2-10 mol% of WO3. The preparation method of the material comprises the processes and steps of 'batching->high energy ball milling->drying->mixing and granulating->sieving->pressure forming->sintering' in turn; only a ferrite sintering and synthesizing step is needed, thus the method is economical, simple and reliable. The sintering body of the Ni-Zn series soft magnetic ferrite material prepared by the preparation method provided by the invention according to the formula has an average crystal particle size of 1-10 mu m; the initial permeability mui is at least 100 when the frequency is 1 MHz; the Curie temperature (Tc) is at least 300 DEG C; the coercive force is lessthan 4.5 Oe; the cut-off frequency fr is greater than 10 MHz; the magnetic loss (mu'' / mu') is less than 2.00 in 1k-100 MHz; the dielectric loss (epsilon'' / epsilon') is less than 0.03; and the comprehensive performance is good, so that the sintering body is particularly suitable for the application of high frequency great magnetic field communication device.

Description

technical field [0001] The invention relates to a high-performance doped nickel-zinc ferrite soft magnetic material and a preparation method, belonging to the technical field of electronic ceramic preparation and application. Background technique [0002] In recent years, in the field of high-frequency device applications, the demand for Ni-Zn-based ferrite soft magnetic materials has continued to expand. However, if ordinary high-frequency Ni-Zn ferrite cores are used in high-frequency and large-field applications, when the current passing through the core coil reaches the ampere level, the temperature will rise sharply due to the increased loss and heat generation of the core. Magnetic cores can easily "pop" or fail the signal. This is caused by the sudden increase of hysteresis loss and dielectric loss caused by the irreversible wall movement of the magnetic core in the high-frequency strong magnetic field. Therefore, high-power Ni-Zn ferrites used in high-frequency and...

Claims

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Application Information

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IPC IPC(8): H01F1/34C04B35/26C04B35/64
Inventor 彭志坚葛慧琳李旦王成彪付志强于翔岳文
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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