In-situ synthesis of high-pure green 6H-SiC

Abstract

The invention discloses an in-situ synthesis of high purity green 6H-SiC. The high purity green 6H-SiC is obtained by smelting the reaction materials composed of anthracite carbon-based material 0.62-0.65 parts, quartz sand 0.98-1.02 parts, silicon carbide-silica composite material 0.20-0.25 parts and adjuvant industrial salt 0.10-0.15 parts and heat insulating materials composed of anthracite 1.90-2.00 parts and quartz sand 2.80-3.10 parts. The synthesis, fundamentally distinguished from the free condensation principle in the Acheson method, uses SiC fine particles as the condensation and reaction matrix, improves the generation efficiency of SiC, reduces the reaction temperature and enables the smelting of the high purity green SiC at a temperature of 1800-2000 DEG C.

Description

technical field [0001] The invention relates to the production of green silicon carbide (SiC), in particular to an in-situ synthesis of high-purity green SiC capable of preparing precision SiC ceramic products. Background technique [0002] As a common abrasive, green silicon carbide is widely used in the grinding of metal parts, ceramics, glass and other materials. At present, the domestic smelting of green silicon carbide adopts the Acheson method, and the main raw materials used are petroleum coke and quartz. Sand, auxiliary material is industrial salt, smelting with constant power supply, producing 1 ton of green silicon carbide (SiC > 98.5%), requires power consumption of 8800-9000 degrees, consumes 3.3 tons of raw materials (1.5 tons of petroleum coke, 1.8 tons of quartz sand), And produce 1.7 tons of industrial waste gas (mainly 1.4 tons of CO, and irritating SO 2 Gas and smoke), the output rate of green silicon carbide first grade (SiC>98.5%) is only about 60%...

AI Technical Summary

Problems solved by technology

[0002] As a common abrasive, green silicon carbide is widely used in the grinding of metal parts, ceramics, glass and other materials. At present, the domestic smelting of green silicon carbide adopts the Acheson method, and the main raw materials used are petroleum coke and quartz. Sand, auxiliary material is industrial salt, smelting with constant power supply, producing 1 ton of green silicon carbide (SiC > 98.5%), requires power consumption of 8800-9000 degrees, consumes 3.3 tons of raw materials (1.5 tons of petroleum coke, 1.8 tons of quartz sand), And produce 1.7 tons of industrial waste gas (mainly 1.4 tons of CO, and irritating SO 2 Gas and smoke), the output rate of green silicon carbide first grade (SiC>98.5%) is only about 60%, and the silicon-based materials used in traditional green silicon carbide smelting require SiO 2 >99.0%, even as high as 99.3%. As a mineral resource, quartz sand will have less and less reserves due to continuous mining; In order to obtain high value-added petroleum products, the continuous deep processing of petroleum has fewer and fewer resources available. As a raw material for the traditional production of green silicon carbide, the future development of the industry has been severely restricted, which will directly threaten the high Development of Grade Green Silicon Carbide

Images