Method for preparing graphite electrode of quartz crucible

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,...