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Novel method for preparing ferrite ceramic soft magnetic material

A soft magnetic material and ferrite technology, which is applied in the field of electronic ceramics preparation and application, can solve the problems of complicated preparation process and operation, achieve few process steps, uniform and controllable grain size, saturation magnetization and Curie high temperature effect

Active Publication Date: 2009-02-18
CHINA UNIV OF GEOSCIENCES (BEIJING) +2
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of traditional ferrite soft magnetic materials such as complex preparation process and operation, and propose a spinel phase with simple process steps, low sintering temperature, precise controllable material composition and doping elements, and excellent sintered body performance Preparation method of ferrite ceramic soft magnetic material, optimize its sintering process parameters, and improve material performance

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  • Novel method for preparing ferrite ceramic soft magnetic material
  • Novel method for preparing ferrite ceramic soft magnetic material
  • Novel method for preparing ferrite ceramic soft magnetic material

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Embodiment 1

[0035] Embodiment 1: commercially available analysis pure NiO, ZnO, Fe 2 o 3 According to 0.5:0.5:1 molar ratio mixing, and add 1% (mass fraction) Bi 2 o 3 , 2% (mass fraction) MnCO 3 , 0.3% (mass fraction) polyvinyl alcohol and 0.05% (mass fraction) DavonC, press 1:2:1 powder: zirconium ball: deionized water mass ratio is put into polyurethane ball mill tank, ball mills on high-energy ball mill for 48 hours Finally, it is dried in the air at 130°C for 48 hours in a drying oven, mixed and sized and sieved, then dry-pressed and sintered at 1150°C for 2 hours. The resulting material is a phase-pure spinel ferrite (see figure 1 ), the grain size is uniform (see figure 2 ), the saturation magnetic moment per unit mass is 75.16emu / g, the coercive force is 2.34Oe, and the Curie temperature is 325°C; the cut-off frequency is in the high frequency range, the high frequency performance is good, and the magnetic permeability at 1MHz is 322.09; within the frequency range of 1k-100M...

Embodiment 2

[0036] Embodiment 2: commercially available analysis pure NiO, ZnO, Fe 2 o 3 、Al 2 o 3 Mix by 0.5:0.5:0.965:0.035 molar ratio, and add 1% (mass fraction) Bi 2 o 3 , 2% (mass fraction) MnCO 3 , 0.3% (mass fraction) polyvinyl alcohol and 0.05% (mass fraction) Davon C, press 1:2:1 powder material: zirconium ball: deionized water mass ratio is put into polyurethane ball mill jar, ball mills 48 on the high-energy ball mill After 1 hour, it was dried in the air at 130°C for 48 hours in a drying oven, mixed and granulated and sieved, then dry-pressed and sintered at 1170°C for 2 hours. The resulting material is a phase-pure spinel ferrite (see image 3 ), the grain size is uniform (see Figure 4); the saturation magnetic moment per unit mass is 71.13emu / g, the coercive force is 2.7366 Oe, and the Curie temperature is 325°C; the cut-off frequency is in the high frequency range, the high frequency performance is good, and the magnetic permeability is 255.02 at 1MHz; in the frequ...

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Abstract

The invention relates to a preparation method of a ferrite ceramics soft magnetic material, which belongs to the technology field of electronic ceramics preparation and application. The ceramics is a pure phase spinelle phase ferrite. The material preparation method comprises the technology steps of dosing, high-energy ball milling, parching, mixing whole grain, sifting, forming, sintering, and the like. Compared to the traditional ferrite material preparation method, the method of the invention only needs once sintering, which is simply called one-step synthesis method; because the preparation technology is much easier, device and technology costs are reduced, and technology reliability and controllability are raised; high pure and high wear resistant zirconia grinding is adopted to precisely control doping element ratio; especial sintering fluxing agent is adopted, and sintering temperature is low. Because the material component can be precisely controlled, grain size can be evenly controlled, with little defect, the obtained ferrite material has exceptional magnetics performance, good high frequency characteristic and high quality factor, and can be widely used for preparing and producing high quality high frequency components. The invention also can be used for other types of electronic ceramics materials, and the like.

Description

technical field [0001] The invention relates to a method for preparing a ferrite ceramic soft magnetic material, belonging to the technical field of electronic ceramic preparation and application. Background technique [0002] Spinel phase ferrite is a widely used ceramic soft magnetic material. The preparation process of ferrite has a great influence on its performance. The traditional ferrite ceramic preparation process is: batching→primary ball milling→drying→crushing→pre-firing→secondary ball milling→drying→mixing and sizing→forming→sintering (Weng Xingyuan. Ni-Zn soft ferrite material application and market Development. New Materials Industry, 2002, 4: 23-24). The method has many process steps, complex equipment, long time consumption, high cost, high sintering temperature, long sintering time, high impurity content, difficult composition control and many defects. Reducing process steps can not only save equipment and man-hour costs, but also reduce uncontrollable fa...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 彭志坚葛慧琳李旦王成彪付志强于翔
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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