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Method for preparing graphite electrode of quartz crucible

A graphite electrode and quartz crucible technology, applied in the field of graphite electrode preparation, to achieve the effects of strong practicability, full utilization of resources, and high volume density

Active Publication Date: 2011-02-23
兴和县青山特种石墨碳素有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a gap in the research of the preparation method of the graphite electrode in various enterprises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Product preparation method:

[0020] Mix 29 tons of calcined petroleum coke particles with a particle size of 0.5-0 mm with 9 tons of molten pitch, and then extrude them with an extruder under a pressure of 15 MPa to form Small rods were roasted at 850°C for 260 hours, then impregnated with 5 tons of molten pitch for 3 hours, baked again at 780°C for 190 hours, and finally purified and graphitized at 2600°C for 58 hours. The output of high-purity graphite electrodes was 36 tons. Product physical and chemical indicators:

[0021] Standard sizes

Embodiment 2

[0023] Product preparation method:

[0024] Mix 29 tons of calcined petroleum coke particles with a particle size of 0.5-0 mm, 4 tons of graphite powder of 0.5-0 mm and 10 tons of molten asphalt, and then extrude them with an extruder under a pressure of 12 MPa. Small rods were roasted at 850°C for 260 hours, then impregnated with 5 tons of molten pitch for 3 hours, baked again at 780°C for 190 hours, and finally purified and graphitized at 2600°C for 58 hours. The output of high-purity graphite electrodes was 41 tons. Product physical and chemical indicators:

[0025] Standard sizes

[0026] The graphite powder is a crushed raw material of artificial graphite subjected to high temperature treatment at 2300-2700°C. After adding 9% graphite powder to the raw material, the extrusion pressure in the molding process is reduced by 20%, and the volume density of the product is increased by 2.4%. Coke undergoes a high temperature of 2000-2300 ℃, and the amorphous carbon...

Embodiment 3

[0028] Product preparation method:

[0029] Mix 33 tons of calcined petroleum coke particles with a particle size of 0.5-0 mm, 4.5 tons of graphite powder of 0.5-0 mm and 11.5 tons of molten asphalt, and then extrude them with an extruder at a pressure of 12 MPa. Small rods were roasted at 870°C for 300 hours, then added with 10 tons of molten pitch to impregnate for 3 hours, baked again at 800°C for 190 hours, and finally purified and graphitized at 2600°C for 60 hours. The output of high-purity graphite electrodes was 46.5 tons. Product physical and chemical indicators:

[0030] Standard sizes

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Abstract

The invention relates to a method for preparing a graphite electrode of a quartz crucible. The method is characterized by comprising the following steps of: crushing and portioning calcined petroleum coke and graphite powder, and adding 20 to 30 percent of molten asphalt into the mixture for kneading; extruding the mixture for molding through an extruder, and baking the extruded mixture for 240 to 300 hours at the temperature of between 830 and 880 DEG C; soaking the baked product into 10 to 20 percent of molten asphalt; baking the soaked product for 180 to 220 hours at the temperature of between 750 and 800 DEG C; and finally, purifying and graphitizing the product for 50 to 70 hours at the temperature of between 2,500 and 2,700 DEG C. The preparation method has the advantages of simple process operation, high yield and strong practicability, makes full use of resources, saves the cost and keeps high volume density at the same time.

Description

technical field [0001] The invention relates to the technical field of graphite electrode preparation, in particular to a method for preparing a graphite electrode for preparing a quartz crucible. Background technique [0002] The semiconductor translucent quartz crucible made by arc method is an indispensable basic material for drawing large-diameter single crystal silicon and developing large-scale integrated circuits. Today, the semiconductor industry and the photovoltaic industry have generally used this kind of crucible to replace the small transparent quartz crucible. It has the advantages of high purity, strong temperature resistance, large size and high precision, good heat preservation, energy saving, and stable quality. [0003] Compared with traditional graphite electrodes, graphite electrodes used to prepare quartz crucibles mainly use petroleum coke and graphite powder as raw materials, coal tar pitch as a binder, and are made by calcination, batching, kneading,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/20H05B7/085C04B35/64C04B35/532
Inventor 臧文平张勇
Owner 兴和县青山特种石墨碳素有限公司
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