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A kind of preparation method of dense small-grain yig ceramics

A small-grain, ceramic technology, applied in the field of preparation of small-grain YIG ceramics, can solve the problems of reducing the performance of YIG ceramics, increasing the grain size, and low saturation magnetization, so as to keep the grain boundary diffusion active and inhibit the crystallization. Boundary migration, the effect of ensuring uniformity

Inactive Publication Date: 2018-02-16
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation of YIG ceramics is mainly through the traditional solid-state method, usually by increasing the sintering temperature to improve the compactness of YIG ceramics, but the increase of sintering temperature will also increase the grain size, so that there are many internal structures in the ceramics. Pores, so that dense YIG ceramics cannot be prepared, resulting in saturation magnetization lower than the theoretical value, which greatly reduces the performance of YIG ceramics

Method used

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  • A kind of preparation method of dense small-grain yig ceramics
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  • A kind of preparation method of dense small-grain yig ceramics

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Experimental program
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Effect test

Embodiment 1

[0031] A kind of preparation method of compact small-grain YIG ceramics comprises the following steps:

[0032] (1) Ingredients: mix yttrium oxide and iron oxide according to chemical formula 3Y 2 o 3 +5Fe 2 o 3 =2Y 3 Fe 5 o 12 Proportioning is carried out to obtain raw materials;

[0033] (2) The first ball milling: put raw materials, balls, and alcohol in a ball mill according to the mass ratio of 20%, 45%, and 35% for wet ball milling. The ball milling time is 12 hours, so that the raw materials are mixed evenly to obtain a slurry ;

[0034] (3) drying: the slurry is placed in a constant temperature box to bake, remove alcohol, and grind in a mortar to obtain powder;

[0035] (4) Pre-burning: put the powder in a muffle furnace for pre-burning, the pre-burning temperature is 1100°C, and the holding time is 6 hours. After pre-burning, the raw materials undergo a chemical reaction (3Y 2 o 3 +5Fe 2 o 3 =2Y 3 Fe 5 o 12 ) to obtain the primary powder of YIG;

[00...

Embodiment 2

[0047] A kind of preparation method of compact small-grain YIG ceramics comprises the following steps:

[0048] (1) Ingredients: mix yttrium oxide and iron oxide according to chemical formula 3Y 2 o 3 +5Fe 2 o 3 =2Y 3 Fe 5 o 12 Proportioning is carried out to obtain raw materials;

[0049] (2) The first ball mill: put raw materials, balls and alcohol in a ball mill according to the mass ratio of 25%, 40%, and 35% for wet ball milling. The ball milling time is 24 hours, so that the raw materials are mixed evenly to obtain a slurry ;

[0050] (3) drying: the slurry is placed in a constant temperature box to bake, remove alcohol, and grind in a mortar to obtain powder;

[0051] (4) Pre-burning: put the powder in a muffle furnace for pre-burning, the pre-burning temperature is 1200°C, and the holding time is 6 hours. After pre-burning, the raw materials undergo a chemical reaction (3Y 2 o 3 +5Fe 2 o 3 =2Y 3 Fe 5 o 12 ), obtain YIG powder;

[0052] (5) The second ba...

Embodiment 3

[0059] A kind of preparation method of compact small-grain YIG ceramics comprises the following steps:

[0060] (1) Ingredients: mix yttrium oxide and iron oxide according to chemical formula 3Y 2 o 3 +5Fe 2 o 3 =2Y 3 Fe 5 o 12 Proportioning is carried out to obtain raw materials;

[0061] (2) The first ball mill: put raw materials, balls and alcohol in a ball mill according to the mass ratio of 25%, 45%, and 30% for wet ball milling. The ball milling time is 12 hours, so that the raw materials are mixed evenly to obtain a slurry ;

[0062] (3) drying: the slurry is placed in a constant temperature box to bake, remove alcohol, and grind in a mortar to obtain powder;

[0063] (4) Pre-burning: put the powder in a muffle furnace for pre-burning, the pre-burning temperature is 1100°C, and the holding time is 6 hours. After pre-burning, the raw materials undergo a chemical reaction (3Y 2 o 3 +5Fe 2 o 3 =2Y 3 Fe 5 o 12 ) to obtain YIG powder;

[0064] (5) The second ...

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Abstract

The invention discloses a preparation method of compact small-grain YIG ceramic. The preparation method comprises the following steps: placing iron oxide and yttrium oxide powder and a proper amount of alcohol in a ball mill and carrying out wet milling to obtain slurry; placing the slurry in a thermotank and drying, and grinding in a mortar to obtain a powder; presintering the powder at high temperature of 1100-1200 DEG C; carrying out wet milling on the presintered powder to obtain slurry; drying the slurry and grinding to a powder; carrying out granulation molding on the powder to obtain a green body; eliminating PVA in the green body; and sintering the green body, rapidly heating the green body to a high temperature T1, rapidly cooling to a low temperature T2 and carrying out heat insulation for a period of time, and naturally cooling to obtain the YIG ceramic. Parameters such as compactness, crystal grain size, saturated magnetization intensity and the like of the prepared YIG ceramic are obviously better than parameters of YIG ceramic prepared by a traditional method. The YIG ceramic of the invention can meet high application requirements.

Description

technical field [0001] The invention relates to the technical field of yttrium-iron-garnet-type ferrite materials, in particular to a method for preparing dense small-grain YIG ceramics. Background technique [0002] YIG(Y 3 Fe 5 o 12 ) is a ferrite with a garnet structure, which has the characteristics of narrow resonance line width and low dielectric loss, and is widely used in microwave ferrite devices. With the development of electronic technology, the performance requirements of electronic devices are getting higher and higher, which in turn puts forward higher requirements for the performance of ferrite materials. At present, the preparation of YIG ceramics is mainly through the traditional solid-state method, usually by increasing the sintering temperature to improve the compactness of YIG ceramics, but the increase of sintering temperature will also increase the grain size, so that there are many internal structures in the ceramics. Pores, so that dense YIG ceram...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/40C04B35/626C04B35/64
CPCC04B35/2675C04B35/626C04B35/6261C04B35/64C04B2235/3225C04B2235/602C04B2235/656C04B2235/764C04B2235/786
Inventor 郑鹏栗星星郑辉邓江峡郑梁秦会斌
Owner HANGZHOU DIANZI UNIV
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