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Carbon/carbon composite material crucible pot and preparing technique thereof

A carbon composite material and production process technology, applied in the field of carbon/carbon composite material crucible for single crystal furnace and its production process, can solve the problems of complex process and high impurity content, and achieve stable structure, simple process and strong cohesion. Effect

Active Publication Date: 2008-12-10
HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Carbon/carbon composite material crucible pot and preparing technique thereof
  • Carbon/carbon composite material crucible pot and preparing technique thereof
  • Carbon/carbon composite material crucible pot and preparing technique thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A crucible for carbon / carbon composite material, which is made of carbon fiber through blanking, densification, purification, and machining.

[0025] by figure 1 As shown, the carbon / carbon composite crucible of the present invention is composed of 2-4 petals (two petals in this embodiment); it is composed of a left petal 1, a right petal 3, and a left petal 1, a right petal 3 There are mounting holes 2 on it. The production process includes the following steps:

[0026] (1) Billet making: open into a web, select short carbon fibers 25mm~70mm long, open them into fluffy needle-like fibers by opening equipment, and then airflow and / or card the opened carbon fibers Form a web, then use a web-laying machine to spread a fiber web and pre-puncture it into a mesh, the surface density of the mesh is 20g / m 2 ~160g / m 2 (This example is 100g / m 2 ); The mesh and surface density is 200g / m 2 ~320g / m 2 (This embodiment is 240g / m 2 ) Carbon cloth needle-punched composite felt, the appare...

Embodiment 2

[0034] by figure 2 As shown, the carbon / carbon composite material crucible formed in step (4) is integrated, and the integrated crucible is cut into a cylinder 4 and a bowl-shaped tray 5 at a distance of 15 mm from the boundary line of the inner arc and the inner cylinder on the cylindrical part. In the upper and lower parts, the cylinder 4 is turned into an outer cone and the bowl-shaped tray 5 is turned into an inner cone. The apex angles of the two cones are the same at 120°C to ensure a firm fit. The operation is convenient, and the cylinder 4 is provided with a lifting hole 2. The same as in Example 1.

Embodiment 3

[0036] by image 3 As shown, when the carbon / carbon composite material crucible of the present invention is a whole, in order to facilitate the cleaning of the quartz crucible residue after the crystal pulling is completed, pluggable through holes can be drilled in the cylindrical and arc transition parts of the crucible 6. These through holes 6 can be made into countersunk screw holes, taper holes, or threaded holes, and the through holes 6 can be plugged with tapered pins or slotted studs. The same as in Example 1.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B15/10C04B35/83
Inventor 廖寄乔邰卫平王跃军龚玉良熊翔黄伯云
Owner HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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