Method for preparing sub micron order silicon carbide powder

Abstract

The invention belongs to the technical field of silicon carbide powder preparation, and discloses a method for preparing sub micron order silicon carbide powder. The method comprises the following steps that raw material silicon carbide powder and a grinding medium are subjected to dry method grinding; ground materials are screened through a screening net; the materials obtained after screening are mixed with a dispersing agent and water, the mixture and the grinding medium are subjected to wet method grinding to obtain silicon carbide fine powder slurry; the silicon carbide fine powder slurryis sequentially conveyed into an alkali purification reaction kettle, an acid purification reaction kettle and a neutralizing tank to be purified, then, the purified slurry is conveyed into a transfer storage container, a drying dispersing auxiliary is added, stirring is performed to be uniform, then precipitation is performed, a supernate is discharged after precipitation is ended, and the obtained precipitation is subjected to filter pressing to obtain a filter cake; the filter cake is put into a tray to be dried, the dried materials are taken out and smashed to obtain the sub micron ordersilicon carbide powder. The inflection point and the inverse point in the machining process can be overcome, and the production efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide powder preparation, in particular to a method for preparing submicron silicon carbide powder. Background technique [0002] Silicon carbide ceramics have high hardness, high temperature strength, high thermal conductivity, good chemical stability, small thermal expansion coefficient, good insulation and excellent performance of wide band gap lamps. They are widely used in aerospace, automobile, machinery, electronics, chemical industry, energy and Environmental protection and other fields have been widely used. Studies have shown that in the preparation process of silicon carbide ceramics, as the particle size of silicon carbide powder raw materials becomes smaller, its sintering performance and mechanical properties will be significantly improved. Therefore, in order to produce fine ceramic products with excellent performance, it is necessary to There are silicon carbide superfine powder...

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Problems solved by technology

However, these methods have more or less problems in the preparation of ultrafine silicon carbide powders. For example, the jet milling method has the advantages of dry method, high efficiency and low pollution, but it has poor classification accuracy and low efficiency for fine powders of 3 μm. Not high; the advantages of vibrating mill pulverization are dry method and low pollution, but the disadvantage is that the ultrafine powder still needs to be classified, and the classification effect is difficult to guarantee; or it is easy to appear agglomeration and "inflection point" in the process of grinding and pulverization or inverse point

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