A kind of silicon carbide-graphene composite powder and preparation method thereof

Abstract

The invention relates to silicon carbide-graphene composite powder and a preparation method thereof. The technical scheme adopted by the invention is that the preparation method comprises the following steps: firstly, mixing 40 to 80 parts by mass of expanded graphite with 20 to 60 parts by mass of silicon-containing raw material and then carrying out ball milling to obtain composite powder; secondly, carrying out heat treatment under the condition of 800 to 1400 DEG C and argon to obtain the silicon carbide-graphene composite powder; or adding 5 to 100 parts by mass of absolute ethyl alcohol solution of a catalyst into 100 parts by mass of composite powder, then stirring and carrying out rotary evaporation; carrying out the heat treatment under the condition of 800 to 1400 DEG C and flowing of argon for 1 to 6 hours to obtain the silicon carbide-graphene composite powder; or adding 10 to 100 parts of mixed solution of the catalyst and a protective agent into the 100 parts by mass of the composite powder, then stirring, and carrying out freeze drying; carrying out the heat treatment under the condition of 800 to 1400 DEG C and the argon to obtain the silicon carbide-graphene composite powder. The preparation method disclosed by the invention has the advantages of simple technology, short production cycle, low production cost and less pollution. The prepared product has the advantages of high specific surface area, good optical property and excellent electrical property.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide or graphene composite powder. In particular, it relates to a silicon carbide-graphene composite powder and a preparation method thereof. Background technique [0002] Silicon carbide is a low density (3.21g / cm 3 ), high melting point (>2700°C), high strength (tensile strength is 2100kg / cm 2 ), high modulus (elastic modulus is 4.9×10 4 kg / cm 2 ), low thermal expansion and corrosion resistance, have been widely used in many fields such as machinery, electronics, chemical industry, energy, aerospace and environmental protection, and its preparation methods include direct reaction method, chemical degradation method, vapor deposition method, liquid phase Crystallization method, carbothermal reduction method, sol-gel method, molten salt method, hydrothermal method, microwave-assisted heating method, etc. [0003] The above-mentioned preparation method of silicon carbide has the disadva...

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Problems solved by technology

At present, the methods for preparing graphene mainly include micromechanical exfoliation method, solution exfoliation method, epitaxial growth method, graphite intercalation method, chemical vapor deposition method and redox method. These methods also have the disadvantages of low yield, high cost and large pollution. , directly adding graphene to SiC materials to strengthen and toughen, the preparation process is complicated, the cost is high, and the effect of strengthening and toughening is not obvious