Carbon-carbon crucible support and preparation method thereof

Abstract

The invention relates to the technical field of crucible supports, in particular to a carbon-carbon crucible support and a preparation method thereof.The method comprises the steps that a carbon fiber net tire and carbon fiber cloth are subjected to flat needling forming, and a crucible support prefabricated body is obtained; cutting the crucible support prefabricated body into a plurality of crucible support prefabricated body blanks with preset shapes; placing the crucible support preform blank in a resin soaking agent for standing; the crucible support prefabricated blank obtained after standing is placed in a shaping mold, a shaping device is integrally subjected to hot pressing treatment, and the low-density crucible support is obtained; performing demolding treatment on the low-density crucible support, performing vapor deposition on the demolded low-density crucible support by using a resin carbon target material, and performing impregnation and carbonization treatment on the crucible support obtained after vapor deposition until the density of the crucible support reaches a preset density; performing high-temperature purification on the obtained crucible support to obtain a carbon-carbon crucible support; the whole shaping mold can be placed in the drying oven for curing and shaping, operation is easy and convenient, and a good hot pressing effect can be achieved without a complex hot pressing process.

Description

technical field [0001] The application relates to the technical field of crucible supports, in particular to a carbon-carbon crucible support and a preparation method thereof. Background technique [0002] With the rapid development of the photovoltaic industry, Czochralski silicon single crystal has achieved industrial development. Domestic silicon single crystal pulling furnaces generally use graphite thermal field and carbon-carbon composite material thermal field. [0003] In the process of preparing single crystal silicon, products such as crucible supports are needed, and the crucible supports, as the stress-bearing parts of the crucible, must have the characteristics of high density, high strength, and strong corrosion resistance. And as the main loss material in the thermal field of monocrystalline silicon preparation, the length of service life directly affects the operating cost of a single furnace and the safety hazard of equipment. Due to the high brittleness of...

AI Technical Summary

Problems solved by technology

[0004] At present, the mainstream preparation process of carbon-carbon crucible holder includes carbon fiber crucible holder prefabricated body and green body hot-press forming; the preparation method of carbon fiber crucible holder prefabricated body is basically contour acupuncture forming, which belongs to the category of special-shaped parts acupuncture, and the mold and The accuracy requirements of the auxiliary materials are relatively high, and the needling takes a long time (generally, it takes 18-25 hours for the shape of a carbon fiber crucible base body to be shaped by needling), and the needling uniformity is difficult to control, and it is easy to appear delamination, cracking, contour Problems such as large size deviation

In addition, hot pressing of the green body usually requires customized graphite molds. The heating process of this process is complicated and takes a long time, and requires sufficient compression margin for the green body of the crucible, and the corresponding amount of dipping will also increase, resulting in a certain degree of raw material waste

At the same time, the price of graphite mold is higher, which increases the production cost of the enterprise

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