Preparation method of spherical alpha-aluminum oxide powder

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...

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