Preparation method of spherical alpha-aluminum oxide powder

A technology of alumina powder and aluminum hydroxide, which is applied in the preparation of alumina/hydroxide, chemical instruments and methods, inorganic chemistry, etc. And thermal conductivity and other issues, to achieve the effect of good thermal conductivity

Inactive Publication Date: 2020-04-07
SUZHOU NANODISPERSIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sphericity of the spherical alumina powder prepared by this method is not high, and it often produces apple-shaped, corn-bread-shaped or pear-shaped non-complete spherical powders with a large number of voids.
These defects cannot be eliminated by normal high-temperature treatment, which seriously affects the fluidity and thermal conductivity of subsequent thermal conductive fillers.

Method used

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  • Preparation method of spherical alpha-aluminum oxide powder
  • Preparation method of spherical alpha-aluminum oxide powder

Examples

Experimental program
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Effect test

Embodiment 1

[0023] S1, take 2040g of aluminum isopropoxide, add 2040g of deionized water, use nitric acid to adjust the pH of the mixture to 4, pour it into a flask and stir in a water bath to heat, control the temperature at 80°C for 2 hours, vacuumize to remove isopropanol to obtain hydrogen oxidation Aluminum aluminum sol;

[0024] S2, pour the obtained aluminum sol into 2040g of cyclohexane, stir at a high speed of 500rpm, add 40g of Span 80 and continue stirring for 30min, then add 204g of ammonia water with a concentration of 14%, to obtain spherical aluminum hydroxide sol particles ; The aluminum hydroxide sol particles are centrifuged and dried in vacuum to obtain spherical aluminum hydroxide sol powder;

[0025] S4, input the dried powder into a vertical high-temperature furnace, and keep it at 1200° C. for 180 minutes, so as to obtain high-purity spherical α-alumina powder.

[0026] Such as figure 1 with figure 2 As shown, the obtained spherical α-alumina powder has a partic...

Embodiment 2

[0028] S1, take 2040g of aluminum isopropoxide, add 2040g of deionized water, use nitric acid to adjust the pH of the mixture to 4, pour it into a flask and stir in a water bath to heat, control the temperature at 80°C for 2 hours, vacuumize to remove isopropanol to obtain hydrogen oxidation Aluminum aluminum sol;

[0029] S2, pour the obtained aluminum sol into 2040g of cyclohexane, stir at a high speed of 200rpm, add 40g of Tween and continue to stir for 30min, then add 204g of ammonia water with a concentration of 14%, to obtain spheroidized aluminum hydroxide sol particles; The aluminum hydroxide sol particles are centrifuged and dried in vacuum to obtain spherical aluminum hydroxide sol powder;

[0030] S4, input the dried powder into a vertical high-temperature furnace, and keep it at 1300° C. for 120 minutes, so as to obtain high-purity spherical α-alumina powder.

[0031] The prepared spherical α-alumina powder has a particle size of D50=2.5 ​​μm, uniform distribution...

Embodiment 3

[0033] S1, take 2040g of aluminum isopropoxide, add 2040g of deionized water, use nitric acid to adjust the pH of the mixture to 4, pour it into a flask and stir in a water bath to heat, control the temperature at 80°C for 2 hours, vacuumize to remove isopropanol to obtain hydrogen oxidation Aluminum aluminum sol;

[0034] S2, pour the obtained aluminum sol into 2040g of cyclohexane, stir at a high speed of 150rpm, add 40g of Span 80 and continue stirring for 30min, then add 204g of ammonia water with a concentration of 14%, to obtain spherical aluminum hydroxide sol particles ; The aluminum hydroxide sol particles are centrifuged and dried in vacuum to obtain spherical aluminum hydroxide sol powder;

[0035] S4, input the dried powder into a vertical high-temperature furnace, and keep it at 1300° C. for 60 minutes, so as to obtain high-purity spherical α-alumina powder.

[0036] The prepared spherical α-alumina powder has a particle size of D50=5 μm, uniform distribution, no...

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Abstract

The invention discloses a preparation method of spherical alpha-aluminum oxide powder, and belongs to the technical field of inorganic non-metallic materials. The preparation method of the spherical alpha-aluminum oxide powder comprises the following steps: S1, hydrolyzing a rectified and purified organic aluminum salt under the pH value of less than 8 to obtain an aluminum sol; evaporating to remove the organic solvent in the aluminum sol under a vacuum heating condition; S2, mixing the aluminum sol into a non-polar organic solvent, stirring at a high speed to form an emulsion, adding a certain amount of a stabilizer into the emulsion to form spheroidized aluminum hydroxide sol particles, carrying out centrifugal separation on the spheroidized aluminum hydroxide sol particles, and carrying out vacuum drying to obtain spherical aluminum hydroxide sol powder; and S3, inputting the dried powder prepared in the step S2 into a vertical high-temperature furnace, and enabling the dried powder to pass through a high-temperature region of 1100-1300 DEG C for 60-180 minutes so as to obtain the spherical alpha-aluminum oxide powder. According to the method, the alpha-phase conversion rate can be increased, the particle size of the prepared aluminum oxide powder is controllable, and the powder is free of agglomeration and breakage.

Description

technical field [0001] The invention relates to a technique in the field of inorganic non-metallic materials, in particular to a method for preparing spherical α-alumina powder. Background technique [0002] With the high power of electronic components, the problem of heat conduction and heat dissipation of electronic equipment has become an important bottleneck in the information industry. In addition, the development of new energy vehicles also requires more efficient heat conduction and heat dissipation, which needs to be solved urgently. As the most commonly used heat conduction / heat dissipation filler for many materials such as thermal silica gel and heat conduction plastic, spherical alumina powder is a core key raw material in the field of heat conduction and heat dissipation due to its low price, stable performance, and abundant raw materials. As a thermally conductive alumina powder, there are generally several key technical requirements that need attention: the hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/44
CPCC01F7/30C01F7/441C01P2004/03C01P2004/32C01P2004/61C01P2004/62C01P2006/80
Inventor 朱堂龙吴永龙王宇湖
Owner SUZHOU NANODISPERSIONS
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