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Quick preparing method for textured single phase hexagonal ferrite

A technology of hexagonal crystal system and ferrite, which is applied in the field of information functional materials, can solve the problems of unsatisfactory calcination temperature and holding time, and achieve the effects of shortening the preparation cycle, saving electric energy, and being easy to produce at a large scale and at a low cost.

Inactive Publication Date: 2007-01-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unsatisfactory selection of calcination temperature and holding time, the prepared material is actually hexagonal M-type barium ferrite and BaFe 0.24 Fe 0.76 o 2.88 Composed of multiphase ferrite with a porous microstructure

Method used

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  • Quick preparing method for textured single phase hexagonal ferrite
  • Quick preparing method for textured single phase hexagonal ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Weigh 4.0g of M-type barium ferrite co-precipitation precursor powder, put it into a high-strength graphite mold with an inner diameter of 15mm, an outer diameter of 45mm, and a lining of carbon paper, and place it in an SPS vacuum chamber;

[0017] (2) Temperature measurement by thermocouple;

[0018] (3) Start the vacuum system, and slowly load when the vacuum degree is lower than 10Pa, and the co-precipitation precursor realizes vacuum dense molding;

[0019] (4) Set the process parameters of SPS sintering: heating rate 200°C / min, sintering temperature 850°C, holding time 10min;

[0020] (5) When the pressure reaches the set value and stabilizes, start the SPS sintering program;

[0021] (6) After the program runs, the SPS sintering system is closed to obtain a textured single-phase hexagonal ferrite, and the density measured by the Archimedes drainage method is 91.5%.

Embodiment 2

[0023] Steps (1), (2) and (3) are the same as in Example 1. Other steps are as follows:

[0024] (4) Set the process parameters of SPS sintering: heating rate 200°C / min, sintering temperature 850°C, holding time 15min;

[0025] (5) When the pressure reaches the set value and stabilizes, start the SPS sintering system;

[0026] (6) After the program runs, the SPS sintering system is closed to obtain a textured single-phase hexagonal ferrite, and the density measured by the Archimedes drainage method is 93.4%.

Embodiment 3

[0028] Steps (1), (2) and (3) are the same as in Example 1. Other steps are as follows:

[0029] (4) Set the process parameters of SPS sintering: heating rate 200°C / min, sintering temperature 850°C, holding time 25min;

[0030] (5) When the pressure reaches the set value and stabilizes, start the SPS sintering system;

[0031] (6) After the program runs, the SPS sintering system is closed to obtain a textured single-phase hexagonal ferrite, and the density measured by the Archimedes drainage method is 95.0%.

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Abstract

The quick preparation process of textured single phase hexagonal ferrite includes the following steps: 1. preparing coprecipitated precursor of M-type barium ferrite; and 2. plasma discharge sintering the coprecipitated precursor through setting the precursor inside high strength graphite mold and in plasma discharge sintering system; vacuum densifying formation; heating in the temperature raising rate of 100-300 deg.c / min to 850-1000 deg.c at pressure 5-20 MPa; and sintering for 10-40 min. The process can prepare textured single phase hexagonal ferrite in high speed and complete texturing and densification simultaneously.

Description

technical field [0001] The invention relates to the field of information functional materials, in particular to a new method for rapidly preparing single-phase hexagonal ferrite by using spark plasma sintering (SPS) technology, and the prepared material has a textured and high-density microstructure . Background technique [0002] Textured single-phase hexagonal ferrite has broad application prospects in the fields of information storage, electromagnetic shielding and military target stealth. The sintering temperature of the single-phase hexagonal ferrite ceramic process is very high. For BaFe 12 o 19 For example, it can be as high as 1250 ~ 1350 ℃, chemical co-precipitation method, molten salt method, hydrothermal crystallization method, sol-gel method, gel self-combustion method, aerosol pyrolysis method and ultrasonic sonolysis method and other methods Although the sintering temperature of the prepared precursor ultrafine powder has dropped below 1000°C, the crystalliz...

Claims

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Application Information

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IPC IPC(8): C04B35/26C30B29/22C30B1/02
Inventor 赵文俞魏平程海斌张清杰唐新峰
Owner WUHAN UNIV OF TECH
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