Method for microwave-assisted low-temperature rapid synthesis of ferrite ultrafine powder

A microwave-assisted synthesis method technology, which is applied in the field of microwave-assisted low-temperature rapid synthesis of ferrite micropowder, can solve the problems of unfavorable large-scale industrial production, long synthesis cycle, and many process steps, and achieve shortened production cycle, uniform components, and The effect of simple preparation process

Inactive Publication Date: 2013-07-17
ANHUI UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although these methods can effectively overcome the defects of high-temperature solid-phase synthesis of ferrite powder and obtain ultrafine and ultra-pure ferrite powder at low temperat...

Method used

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  • Method for microwave-assisted low-temperature rapid synthesis of ferrite ultrafine powder
  • Method for microwave-assisted low-temperature rapid synthesis of ferrite ultrafine powder
  • Method for microwave-assisted low-temperature rapid synthesis of ferrite ultrafine powder

Examples

Experimental program
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Effect test

Embodiment 1

[0018] According to Ni 0.5 Zn 0.5 Fe 2 o 4 For the stoichiometric ratio of ferrite, respectively weigh and analyze pure metal oxides NiO3.479g, ZnO3.423g and Fe 2 o 3 13.433g, put it into a stainless steel ball mill tank, use absolute ethanol as solvent, wet ball mill for 5 hours, the ratio of ball to material is 6:1, the slurry obtained by ball mill is dried and passed through a 100-mesh sieve to obtain the mixture. Put the mixture into an alumina ceramic crucible, cover it with a SiC auxiliary heating sheet, then place it in a microwave sintering furnace to raise the temperature to 680°C at a heating rate of 20°C / min, then keep it warm for 30min, the microwave frequency is 2.45GHz, and it is ready after cooling Ferrite powder.

Embodiment 2

[0020] This embodiment is a comparative experiment of embodiment 1.

[0021] Weigh the analytically pure metal oxides NiO, ZnO and Fe respectively 2 o 3 3.479, 3.423 and 13.433g each. Put the raw materials into a stainless steel ball mill tank, use absolute ethanol as a solvent, and perform wet ball milling for 5 hours with a ball-to-material ratio of 6:1. The slurry obtained from the ball mill is dried and passed through a 100-mesh sieve to obtain a mixture. Put the ball mill mixture into an alumina ceramic crucible, then place it in a box-type furnace sintering furnace, raise the temperature to 900°C at a heating rate of 10°C / min, keep it for 120min, and obtain ferrite powder after cooling.

[0022] figure 1 Ni was synthesized by conventional solid-state reaction and microwave-assisted solid-phase synthesis. 0.5 Zn 0.5 Fe 2 o 4 XRD pattern of ferrite powder. From figure 1 It can be seen that Example 1 adopts microwave-assisted low-temperature rapid synthesis to obta...

Embodiment 3

[0026] According to Ni 0.7 Zn 0.3 Fe 2 o 4 For the stoichiometric ratio of ferrite, respectively weigh and analyze pure metal oxides NiO4.871g, ZnO0.104g and Fe 2 o 3 13.51g, put into a stainless steel ball mill jar, use absolute ethanol as solvent, wet ball mill for 5 hours, the ball-to-material ratio is 6:1, the slurry obtained by the ball mill is dried and passed through a 100-mesh sieve to obtain the mixture. Put the mixture into an alumina ceramic crucible, cover it with a SiC auxiliary heating sheet, then place it in a microwave sintering furnace to raise the temperature to 950°C at a heating rate of 30°C / min, then keep it warm for 20min, the microwave frequency is 2.45GHz, and it is ready after cooling Ferrite powder.

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Abstract

The invention discloses a method for microwave-assisted low-temperature rapid synthesis of ferrite ultrafine powder. The method comprises the steps of respectively weighing metallic oxide of Me, ZnO and Fe2O3 depending on chemical dosage of ferrite Me(1-x)ZnxFe2O4, mixing and wet-ball milling, drying and filtering by a 100-mesh sieve to obtain a mixture; and adding the mixture in a microwave reaction furnace, carrying out microwave-assisted solid synthesis for 10-30min in an air atmosphere at 600-950 DEG C, and cooling to obtain the ferrite ultrafine powder, wherein the Me is Ni, Mn or Co, and x is not greater than 1.0 and not less than 0. The process for microwave-assisted low-temperature rapid synthesis of the ferrite ultrafine powder is simple, high in temperature raising speed, short in heat preservation duration, low in synthesis temperature and excellent in performance, and is capable of effectively reducing production cost and energy consumption, and improving the production efficiency. And the method is applicable to mass production.

Description

1. Technical field [0001] The invention relates to a method for preparing magnetic materials, in particular to a method for rapidly synthesizing ferrite micropowder at low temperature with microwave assistance. 2. Background technology [0002] Ferrite magnetic materials have the characteristics of high resistivity, low loss, good dielectric properties and frequency characteristics, and are an important class of magnetic functional materials. Has a wide range of applications. At present, ferrite powder for industrial production is mainly prepared by metal oxide solid-state reaction method, which has simple process, accurate formula, and is easy for large-scale industrial production. However, the traditional solid state reaction method synthesizes ferrite powder, and its solid state reaction temperature is high (thousands of degrees) (Liu Shuxin, China Powder Technology, 2011, 17 (1): 29), and the synthesis period is long (several hours). The high-temperature diffusion and ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/64
Inventor 刘银闵凡飞朱金波张明旭
Owner ANHUI UNIV OF SCI & TECH
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