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Method for preparing spherical alpha-phase alumina

A technology of spherical alumina and phase alumina, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems of limitation and difficulty in preparing α-phase alumina, and achieve high filling capacity, short preparation time and high fluidity Effect

Inactive Publication Date: 2013-04-24
雅安百图高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The α-alumina prepared by the existing conventional technology mainly uses electric heating technology to convert other phases such as γ-phase alumina into α-phase alumina. This method has a high content of α-phase, but the prepared product is non-spherical
Non-spherical alumina is limited in application
At the same time, the preparation method of α-phase spherical alumina with a particle size of 40 μm or more is relatively mature in the prior art, but it is difficult to prepare α-phase alumina with a high content of α-phase below 40 μm

Method used

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  • Method for preparing spherical alpha-phase alumina

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Commercially available α-alumina was crushed to an average particle size of 10 μm. As a raw material, the raw material was put into a triple tube burner and the temperature was controlled at 2100°C to 2300°C for melting and spheroidization to obtain Test Sample 1-1. The test sample 1-1 was put into the burner again and the flame temperature was controlled at 1800°C to 2000°C for heat treatment to obtain the test sample 1-2. The obtained samples were measured by XRD, and the content of each crystal phase was calculated from the intensity of each crystal characteristic peak and listed in Table 1.

Embodiment 2

[0019] Commercially available γ-alumina was crushed to an average particle size of 10 μm. As a raw material, the raw material was put into a triple tube burner and the temperature was controlled at 2100°C to 2300°C for melting and spheroidization to obtain test sample 2-1. The test sample 2-1 was put into the burner again, and the flame temperature was controlled at 1800°C to 2000°C for heat treatment to obtain the test sample 2-2. The obtained samples were measured by XRD, and the content of each crystal phase was calculated from the intensity of each crystal characteristic peak and listed in Table 1.

Embodiment 3

[0021] Commercially available α-alumina was crushed to an average particle size of 5 μm. As a raw material, the raw material was put into a triple tube burner and the temperature was controlled at 2100°C to 2300°C for melting and spheroidization to obtain test sample 3-1. The test sample 3-1 was put into the burner again and the flame temperature was controlled at 1800°C to 2000°C for heat treatment to obtain the test sample 3-2. The obtained samples were measured by XRD, and the content of each crystal phase was calculated from the intensity of each crystal characteristic peak and listed in Table 1.

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Abstract

The invention discloses a method for preparing spherical alpha-phase alumina. The method comprises the following steps of: step 1, heating aluminum-containing powder at 2100-2300 DEG C for spheroidization to obtain spherical alumina powder; and step 2, heating and calcining the spherical alumina powder at 1200-2072 DEG C to obtain spherical alpha-phase alumina. The prepared alpha-phase alumina is spherical, the spheroidization rate is higher than 90%, and the spherical alpha-phase alumina has high fluidity, uniform stress and high filling volume and can be widely applied to the field; besides, breaking is not needed in the preparation process, so that not only is the spheroidization of the alpha-phase alumina guaranteed, but also the preparation steps are decreased; and moreover, the alumina smaller than 40 microns is subjected to secondary heating, so the problem of difficultly preparing the high-content alpha phase from the alumina smaller than 40 microns is solved. Therefore, the preparation method and the preparation process are simple, the preparation time is short, and the spherical alpha-phase alumina with high content can be prepared.

Description

technical field [0001] The invention relates to a method for preparing spherical alpha-phase alumina by two high-temperature calcinations. Background technique [0002] α-phase alumina has strong thermal conductivity, good formability, stable crystal phase, high hardness, and good dimensional stability. It can be widely used in the reinforcement and toughening of various plastics, rubber, ceramics, refractory materials, etc. The compactness, smoothness, cold and heat fatigue, fracture toughness, creep resistance and wear resistance of polymer materials are particularly remarkable in ceramics. Since α-phase alumina is also an excellent far-infrared emitting material, it is used in chemical fiber products and high-pressure sodium lamps as a far-infrared emitting and thermal insulation material. In addition, the α-phase alumina has high resistivity and good insulation properties, and can be used in the main accessories of YGA laser crystals and integrated circuit substrates. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/42
Inventor 郭庆王樱丽杨冬高承兵
Owner 雅安百图高新材料股份有限公司
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