Carbon/carbon composite material crucible pot and preparing technique thereof

Abstract

The invention discloses a carbon / carbon composite material crucible with simple technique and environmental protection and a technique for producing the same. The carbon / carbon composite material crucible can be prepared into a whole, or consists of 2 to 4 sections or consists of an upper part and a lower part which are relatively a bowl-shaped tray (5) and a cylinder (4). The technique for producing the carbon / carbon composite material crucible is as follows: the carbon / carbon composite material crucible is prepared through performing, densifying, purifying and machining of carbon fibers. The production technique has a simple technique; under the condition of performing, a mat which is formed by fluffy needlelike carbon fibers is adopted, thereby a quasi-three-dimensional prefabricated part is easy to obtain under the condition of needling; internal carbon fibers of the quasi-three-dimensional prefabricated part are interlaced, have strong cohesive force, can not be delaminated, and have stable structures; simultaneously, the pore space of the prefabricated part is small, which is convenient for accelerating the subsequent process of the densifying; and the purity of the crucible after the densifying is very high, and the carbon / carbon composite material crucible with an ash content less than 180 ppms can be produced only through high-temperature purification under the condition of vacuum or protective atmosphere; and the carbon / carbon composite material crucible is energy-saving and environment-friendly.

Description

Technical field: [0001] The invention relates to a tooling for a high-temperature furnace, in particular to a carbon / carbon composite crucible for a single crystal furnace and a production process thereof. Background technique: [0002] At present, graphite crucibles commonly used in single crystal furnaces to hold quartz crucibles, commonly known as multi-petal crucibles, or graphite crucible holders, are indispensable tooling for single crystal furnaces. When a single crystal silicon rod is drawn by a single crystal furnace, a quartz crucible containing polycrystalline silicon blocks and other raw materials is placed in a graphite crucible above the bottom of the crucible, heated and melted in a protective atmosphere, and the process temperature is adjusted to the seed crystal through diversion The cylinder is inserted into the molten polycrystalline silicon liquid, the seed crystal and the graphite crucible are rotated in the opposite direction and lifted upward, so that the p...

AI Technical Summary

Problems solved by technology

The densification process adopted in this method requires repeated densification treatment several times to make the product density ≥ 1.83g / cm 3 The process can only be completed when the process is relatively complicated, the impurity content is high, and chlorine and freon must be introduced to purify the product, which brings a certain pressure on environmental protection. Today, people's awareness of environmental protection is increasing, which is what people do not want. of

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