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Silicon carbide synthesis method

A synthesis method and technology of silicon carbide, applied in the direction of silicon carbide, carbide, etc., can solve the problems of increasing the use cost of production equipment, and achieve the effect of prolonging life, reducing production cost and reducing maintenance.

Active Publication Date: 2012-08-15
石河子市丰拓硅材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Adjusting the position of graphite electrodes requires stopping production, and overall replacement will greatly increase the cost of production equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Load a mixture of petroleum coke and quartz sand at the bottom of the furnace body, take 1 part by weight of graphite powder and pulverize into powder ≤1mm, add 2 parts by weight of water and stir into a slurry, on the side of the furnace body heating cavity Apply 20mm on the graphite electrodes of the two furnace heads of the two furnace heads, fill the furnace core between the two end graphite electrodes with conductive graphite powder, and then fill the conductive graphite powder with reactant and insulation materials in sequence, and then energize to heat, Gradually increase the power to the rated value within 1.2 hours, and then enter the constant power holding phase.

Embodiment 2

[0013] Example 2: Fill the bottom part of the furnace body with a mixture of petroleum coke and quartz sand, and take 1 part by weight of graphite powder and pulverize into powder ≤ 1 mm. Add 3 parts by weight of water and stir to form a slurry, smear the two furnace head graphite electrodes on the side of the furnace body heating chamber to form a 10mm coating, and then install the conductive material in the furnace core part between the two end graphite electrodes Graphite powder is filled with reaction material and insulation material in sequence around the conductive graphite powder, and then heated by electricity. The power is gradually increased to the rated value within 1 hour, and then it enters the constant power holding stage.

Embodiment 3

[0014] Example 3: Fill the bottom part of the furnace body with a mixture of petroleum coke and quartz sand, and take 1 part by weight of graphite powder and pulverize it into powder ≤ 0.5 mm. Add 1.2 parts by weight of water and stir to form a slurry, apply a 25mm coating on the two furnace head graphite electrodes on one side of the furnace body heating chamber, and then install a conductive material in the furnace core between the two end graphite electrodes Graphite powder is filled with reaction material and insulation material in turn around the conductive graphite powder, and then energized to heat, gradually increasing the power to the rated value within 2 hours, and then entering the constant power holding stage.

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Abstract

The invention discloses a silicon carbide synthesis method. The silicon carbide synthesis method includes procedures of filling packing, electrifying and heating, keeping constant power, naturally cooling and discharging. The silicon carbide synthesis method is characterized in that at least a graphite slurry layer is smeared on a burner graphite electrode on one side of a furnace heating cavity before conduction graphite powder is filled in the packing filling procedure, and then packing filling procedure for the conduction graphite powder is carried out. Compared with the prior art, the silicon carbide synthesis method has the advantages that melt can be prevented from being adhered on the surface of the graphite electrode, the surface of the graphite electrode can be cleaned quite easily before next loading, graphite powder and the melt which are smeared on the surface of the graphite electrode can be completely removed only by means of lightly scraping the surface of the graphite electrode by the aid of a scraper, further, water is used as a bonding agent during smearing and volatilizes when heated, conductivity between the graphite electrode and the graphite powder of a furnace core is unaffected, the surface of the graphite electrode cannot be damaged, accordingly, the service life of the graphite electrode is greatly prolonged, maintenance frequency is reduced, production efficiency is improved, and production cost is lowered.

Description

Technical field [0001] The invention relates to a method for synthesizing silicon carbide. Background technique [0002] In the industrial synthesis of silicon carbide, especially the synthesis of green silicon carbide, the resistance furnace synthesis process is used. The resistance furnace contains a furnace body with a heating cavity. The two ends of the furnace body heating cavity are equipped with graphite electrodes. In the synthesis production , First, there is a filling process, that is, the bottom of the furnace body is filled with a mixture of petroleum coke and quartz sand, etc., and then the furnace core part between the two end graphite electrodes is filled with conductive graphite powder. Then fill the reactant material and insulation material around the conductive graphite powder, and then energize the graphite electrodes at the two ends, so that the conductive graphite powder is energized to heat the reactant material around the conductive graphite powder. During ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36C01B32/956
Inventor 赵建立由远洪孙福龙白周义牛景林焦松强
Owner 石河子市丰拓硅材料科技有限公司
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