Method for synthesizing homogeneous nano silicon carbide powder by burning

Abstract

The invention pertains to a preparation technique field of inorganic nano material, in particular to a combustion synthesis method of heterogeneous nano silicon carbide powder. Silicon powder, carbon powder, silicon nitride or silicon carbide additive, and polytetrafluoroethene are adopted as materials, and made into reaction materials according to a certain proportion, and ground and mixed, then held in a praphite crucible, and put into a sealed high pressure reaction synthesis equipment; the reaction equipment is vacuumized and filled with nitrogen to a proper pressure, and the combustion synthesis reaction is triggered by partial electrothermal ignition or partial high frequency induction heating; after the completion of the reaction, the products are collected and treated, and the heterogeneous nano silicon carbide powder with an average crystal particle size less than 100nm can be obtained. The invention realizes the target of preparing high quality nano silicon carbide powder through combustion synthesis technique with low cost, and has the advantages of simple and convenient technique, energy conservative synthesis process, cleanness and pollution free, etc.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, in particular to a method for combusting and synthesizing homogeneous nanometer silicon carbide powder. Background technique [0002] As an important structural ceramic material, silicon carbide ceramics have excellent characteristics such as low density, high hardness, strong wear resistance, oxidation resistance, corrosion resistance, high thermal conductivity, small thermal expansion coefficient, good thermal stability, and outstanding high-temperature strength. , has been widely used in bearings, cutting tools, mechanical seal components, rocket nozzles and engine components, and has great development potential. As the raw material for the production of silicon carbide ceramic products, the commercial demand of silicon carbide powder is also increasing year by year. In particular, high-quality submicron and nano-scale ultrafine silicon carbide powders are...

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Problems solved by technology

However, the raw materials used in the gas phase reaction method are expensive and the output is low, so the production cost is very high, and it is still difficult to form a large production scale at present.

[0007] Among the above-mentioned methods, the Acheson method and the direct chemical method not only consume a lot of energy, but also the synthesized silicon carbide powder particles are relatively coarse, generally in the micron level or even tens of millimeters; although the gas phase reaction method can synthesize submicron and nanometer powders , but the cost is high, the output is small, and it is difficult to produce on a large scale

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