Preparation method of low specific surface area submicron alumina

Abstract

The invention discloses a preparation method of low-specific surface area submicron aluminum oxide. The preparation method is characterized by comprising the following steps: S1, selecting a raw material: taking the conventional calcined aluminum oxide in the market, wherein the crystal form is an alpha crystal form and the aluminum oxide content is higher than 99%; S2, grinding: grinding the calcined aluminum oxide till the median particle size of 0.1-1 micron by a wet ball milling technology; S3, drying: drying the aluminum oxide treated by the wet ball milling technology to remove moisture;S4, calcinating at low temperature: calcinating the dried aluminum oxide at 900-1200 DEG C; S5, crushing: crushing the aluminum oxide calcinated at low temperature by a dry crushing technology, namely depolymerizing a product after low-temperature calcination till a submicron scale in the form of original crystal grains to obtain a finished product. The invention provides the preparation method of low-specific surface area submicron aluminum oxide, which is simple and easy to implement and by which the product quality is stable and scale production can be achieved.

Description

technical field [0001] The invention relates to the technical field of alumina powder preparation, in particular to a method for preparing submicron alumina with a low specific surface area. Background technique [0002] Submicron alumina has excellent insulation properties, chemical stability, high temperature resistance, and excellent thermal conductivity, with a thermal conductivity as high as 30W / (K m), and is widely used as a heat dissipation filler for electronic products. The development of thinner and thinner modern electronic products and the increase in computing speed require fillers to enhance heat dissipation, which is generally achieved by increasing the amount of fillers added. Technically, submicron alumina fillers are required to have a lower ratio and adapt to a higher filling ratio. [0003] In addition, with the continuous improvement of the capacity of lithium-ion rechargeable batteries, the energy stored inside is increasing. When charging and dischargi...

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Problems solved by technology

At the same time, it will cause part of the α crystal form to be destroyed and annealed, and the XRD pattern can show the phenomenon of crystallization peak broadening

After grinding, the surface of the product is rough, and the water (oil) value increases, resulting in poor fluidity in the filler system, which is not conducive to the application of downstream thermal conductive fillers, and is also not conducive to the use of lithium battery diaphragm coating

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