Raw material formulation and method for low-temperature silicon carbide synthesization

Abstract

The invention discloses a raw material dispense prescriptions to synthesize carbofrax at low temperature and method, which comprises the following steps: making cane sugar, alcohol water solution, ferric nitrate, normal ethyl-silicones acid and acid catalyst as raw material dispense prescriptions; dissolving cane sugar into alcohol water solution; adding into ferric nitrate; dipping normal ethyl-silicones acid and acid catalyst; preparing carbofrax forerunner body xerogel; placing xerogel in vacuum graphite oven to carbon thermal reduction; preparing carbofrax; cooling model to room temperature; dealing several hours in the air; washing with mixed solution of fluohydric acid and azotic acid; washing; filtering; drying; getting purified carbofrax.

Description

technical field [0001] The invention belongs to the field of silicon carbide materials, and in particular relates to a raw material formula and method for synthesizing silicon carbide at low temperature. Background technique [0002] Silicon carbide (SiC) has the advantages of good thermal conductivity, chemical stability, thermal shock resistance, etc., and has been widely used in catalysis, ceramics, metal composite materials and wear-resistant materials. Semiconductor materials with band gap, high electron mobility and high thermal conductivity have good application prospects in the fields of electronics, luminescence, and sensors. At present, the preparation method of silicon carbide is mainly the Acheson method, that is, coke powder and quartz sand are mixed in a molar ratio of 3:1, an appropriate amount of additives are added, and then heated to above 2000 ° C in an electric arc furnace. A series of complex chemical reactions produce silicon carbide. Domestic and for...

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Problems solved by technology

Chinese patent (publication number: CN 1401564A) reported that phenolic resin was used as the carbon source and silicate was used as the silicon source, and the precursor was synthesized by the sol-gel method under the catalysis of transition metals, and then reacted at 1250 ° C to obtain The carbothermal reduction temperature used in the research of silicon carbide is low, but the reaction time is long, generally more than 20h

However, the method for directly determining the minimum reaction temperature required for the preparation of silicon carbide from the relationship between the pressure in the furnace and the temperature has not been reported.

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