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Method for preparing high-performance ferrite material with microwave sintering method

A ferrite material and microwave sintering technology, which is applied in the field of preparing high-performance ferrite materials by microwave sintering, can solve the problems of deteriorating ferrite electromagnetic properties, easy abnormal growth of grains, easy segregation of material components, etc., and achieve Effects of inhibiting abnormal grain growth, increasing densification rate, improving sintering performance and electromagnetic properties

Inactive Publication Date: 2013-07-10
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sintering temperature of the ferrite powder prepared by the traditional solid-state reaction method is generally above 1200°C, the firing cycle is long, the material components are easy to segregate during the firing process, and the grains inside the material are easy to grow abnormally, thus deteriorating the ferrite powder. The electromagnetic characteristics of the body, and the production cost is high and the energy consumption is large, so it is necessary to reduce its sintering temperature and sintering time to improve its performance

Method used

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  • Method for preparing high-performance ferrite material with microwave sintering method
  • Method for preparing high-performance ferrite material with microwave sintering method
  • Method for preparing high-performance ferrite material with microwave sintering method

Examples

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Effect test

Embodiment 1

[0024] Take 9.8g nanometer Ni 0.4 Zn 0.6 Fe 2 o 4 Ferrite powder and 0.02g sintering aid CuO powder, put the raw materials into a polytetrafluoroethylene ball mill tank, use absolute ethanol as a grinding aid, ball mill for 6 hours, and then dry at 80°C for 24 hours to obtain a mixture. Nano-Ni used 0.4 Zn 0.6 Fe 2 o 4 The particle diameter of ferrite powder is 10-30nm, and particle is spherical shape, and size is uniform; Add the polyvinyl alcohol of 6% of mixture mass in the obtained mixture as binding agent and carry out granulation to obtain pellets, and the obtained pellets The material is passed through a 200-mesh sieve, and then pre-pressed at a pressure of 30 MPa at normal temperature to obtain a pre-pressed molding material, and then the pre-pressed molding material is cold-isostatically pressed at a molding pressure of 200 MPa at room temperature to obtain a molding material; the molding material is placed in a muffle In the furnace, heat up to 500°C at a heat...

Embodiment 2

[0027] This embodiment is a comparative test of embodiment 1.

[0028] Take 9.7g nanometer Ni 0.4 Zn 0.6 Fe 2 o 4 Ferrite powder and 0.03g of sintering aid CuO powder were put into a polytetrafluoroethylene ball mill jar, and absolute ethanol was used as a grinding aid, ball milled for 6 hours, and then dried at 80°C for 24 hours to obtain a mixture. Nano-Ni used 0.4 Zn 0.6 Fe 2 o 4 The particle size of the ferrite powder is 10-30nm, and the particles are spherical and uniform in size; then add polyvinyl alcohol with 5% of the mass of the mixture into the mixture as a binder, and granulate to obtain pellets. The material is passed through a 200-mesh sieve, and then pre-pressed at a pressure of 20 MPa at room temperature to obtain a pre-pressed molding material, and then the pre-pressed molding material is cold-isostatically pressed at room temperature with a molding pressure of 300 MPa to obtain a molding material; the molding material is placed in a high-temperature bo...

Embodiment 3

[0033] Take 9.0g nanometer Ni 0.5 Zn 0.5 Fe 2 o 4 Ferrite powder and 0.02g sintering aid CuO powder, put the raw materials into a polytetrafluoroethylene ball mill tank, use absolute ethanol as a grinding aid, ball mill for 6 hours, and then dry at 80°C for 24 hours to obtain a mixture. Nano-Ni used 0.5 Zn 0.5 Fe 2 o 4 The particle diameter of the ferrite powder is 10-30nm, and the particles are spherical and uniform in size; then add polyvinyl alcohol with 6% of the mass of the mixture as a binder to the mixture, and granulate to obtain pellets. The material is passed through a 200-mesh sieve, and then pre-pressed at a pressure of 30 MPa at room temperature to obtain a pre-pressed molding material, and then the pre-pressed molding material is cold-isostatically pressed at a molding pressure of 250 MPa at room temperature to obtain a molding material; the molding material is placed in a muffle In the furnace, heat up to 600°C at a heating rate of 3°C / min, then keep it w...

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Abstract

The invention discloses a method for preparing a high-performance ferrite material with a microwave sintering method, which comprises the following steps: carrying out wet ball milling after mixing a nano ferrite powder material and a sintering adjuvant CuO, also drying so as to obtain a mixing material, then adding an adhesive of polyvinyl alcohol into the mixing material and granulating so as to obtain a particle material; and sieving the particle material by a sieve with 200 meshes, then prepressing by the pressure of 10 to 30MPa at normal temperature so as to obtain a prepressed forming material, forming the prepressed forming material by the forming pressure of 200 to 300MPa at the normal temperature in a cold isostatic pressing way so as to obtain a forming material, afterwards carrying out degumming treatment, then placing in a microwave sintering furnace and carrying out microwave sintering for 10 to 30 minutes in air at 1000 to 1200 DEG C so as to obtain a finished product after cooling. According to the method for preparing the high-performance ferrite material with the microwave sintering method, the process is simple, and the production period is short. The method for preparing the high-performance ferrite material with the microwave sintering method has the characteristics of high heating-up speed, short heating time, low sintering temperature and high efficiency,the aim of uniform heating with zero gradient is realized in an area with larger volume in the material, and energy is saved. The sintered ferrite material has better performance and considerable economic benefit.

Description

1. Technical field [0001] The invention relates to a magnetic material and a preparation method thereof, in particular to a method for preparing a high-performance ferrite material by a microwave sintering method. 2. Background technology [0002] Ferrite magnetic materials mainly include spinel-type, garnet-type and magnetoplumbite-type polycrystalline and single-crystalline ferrite materials, which have high resistivity, low loss, good dielectric properties and frequency characteristics, and are a class of Important magnetic functional materials are widely used in modern communication, military, electronics, information, chemical industry, biology, medicine and other fields. [0003] In recent years, with the miniaturization of various microelectronic devices and the sharp increase in demand, "high energy storage, low loss, high frequency of use, and good stability" has gradually become one of the development directions of ferrite materials. Therefore, in the preparation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 刘银丘泰闵凡飞朱金波张明旭
Owner ANHUI UNIV OF SCI & TECH
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