Preparation method of spherical aluminum oxide and prepared spherical aluminum oxide

A spherical alumina, alumina technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of electronic products with low voltage withstand performance, circuit board breakdown, etc., to reduce the dielectric constant, increase Liquidity, good for heat dissipation

Pending Publication Date: 2022-07-19
内蒙古先进陶瓷设计院有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] However, the current process for preparing spherical alumina uses alumina as a raw material. The raw alumina contains more impurities such as iron and sodium. If the impurities are not removed, it will affect its service life in subsequent electronic products. A large amount of sodium and iron impurities The existence of the electronic product may greatly reduce the withstand voltage performance of the electronic product, and even cause the breakdown of the circuit board in severe cases

Method used

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  • Preparation method of spherical aluminum oxide and prepared spherical aluminum oxide

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preparation example Construction

[0025] In order to improve the spheroidization rate and purity of spherical alumina, a first aspect of the present invention provides a method for preparing spherical alumina, comprising one demagnetization and flame spraying, and one demagnetization includes the following steps:

[0026] (1) adding aluminum oxide to ammonium salt and grinding, obtaining the aluminum oxide with particle diameter of 0.5-30 μm;

[0027] (2) Alumina and water are added to the stirring tank with the magnetic bar, stirred for 30 to 50 min, and the stirring temperature is 85 to 95 ° C, then filtered, washed with detergent, and dried to obtain a demagnetization alumina;

[0028] The flame spraying includes the following steps: spraying the primary demagnetized alumina through flame spraying, and the temperature of the flame spraying is 2300-2800° C. to obtain spherical alumina.

[0029] As a preferred embodiment, the ratio of alumina to water in the first demagnetization process is (0.4-0.6 g): 1 mL....

Embodiment approach

[0047] As a preferred embodiment, the preparation method of the spherical alumina also includes secondary demagnetization, which includes the following steps:

[0048] (1) adding the spherical alumina and water obtained by flame spraying into the stirring tank with the magnetic bar, and stirring for 30~50min;

[0049] (2) Filtration and drying to obtain secondary demagnetized spherical alumina.

[0050] As a preferred embodiment, the ratio of spherical alumina to water in the secondary demagnetization process is (0.1-0.3 g): 1 mL.

[0051] As a preferred embodiment, in the secondary demagnetization, the drying time is 3-6 hours, and the temperature is 150-200°C.

[0052] During the flame spraying process, the residual iron may be adsorbed on the surface of the spherical alumina, and the sodium inside the alumina may also be precipitated. Therefore, after the flame spraying, the iron and sodium can be further removed by the secondary demagnetization, so that the The iron and so...

Embodiment 1

[0057] A preparation method of spherical alumina, comprising primary demagnetization and secondary demagnetization, comprising the following steps:

[0058] (1) Alumina is added to the ammonium salt and ground to obtain a ground alumina with a particle size of 20 μm, the ammonium salt is ammonium bicarbonate and ammonium chloride, and the weight ratio is 1:0.75, and the ammonium salt accounts for the alumina 1wt%. ;

[0059] (2) adding grinding alumina and water to the stirring tank of laying the magnetic bar, the ratio of the grinding alumina and water is 0.5g: 1mL, stirring for 40min, the temperature of stirring is 90 ℃, then filter, add kerosene for washing, Dry, the drying temperature is 375 ℃, and the drying time is 2.5h to obtain a demagnetized alumina;

[0060] (3) once demagnetized alumina is sprayed by flame, and the temperature of flame spray is 2500 ℃ to obtain spherical alumina;

[0061] (4) adding spherical alumina and water to the stirring tank with the magnet...

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Abstract

The invention discloses a preparation method of spherical alumina and spherical alumina prepared thereof.The preparation method comprises one-time demagnetization and flame jeting.A flame high-temperature melting method is adopted, irregular powder is changed into powder with the good sphericity degree in oxygen-enriched high-temperature flames, the prepared spherical alumina is high in sphericity forming rate, sodium and potassium are added, and the spherical alumina is uniform in particle size. Compared with the prior art, the prepared ceramic material has the advantages of lower iron impurity content, lower water content and no bonding phenomenon, and can be used for preparing ceramic materials and glass fibers.

Description

technical field [0001] The invention relates to a spherical alumina, which is mainly used in the field of filling inorganic materials, and is mainly used in ceramic materials and glass fibers. Background technique [0002] With the rapid development of modern chip technology, power and 5G communication network technology, electronic products are developing in the direction of small, micro, light and thin, while the required load functions are increasing, and the assembly density and integration of the original components Higher and higher, more and more heat is generated per unit area, which will inevitably affect the service life and reliability of electronic components. Therefore, spherical thermal conductivity and insulating materials have been developed. The spherical shape can improve the filling rate and increase the glue The fluidity of the adhesive, and the addition of the spherical material improves the heat dissipation and low dielectric properties of the material;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/027C01F7/025
CPCC01F7/025C01F7/027C01P2004/32C01P2006/80
Inventor 阎法强薛友祥王再义任汝学陈学江李鹏
Owner 内蒙古先进陶瓷设计院有限公司
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