Preparation method of carbon/carbon/silicon carbide composite material crucible

Abstract

The invention belongs to the technical field of crucible preparation, and discloses a preparation method of a carbon / carbon / silicon carbide composite material crucible. The preparation method comprises the following steps that: A) carbon fiber plain cloth and carbon fiber net tires are sequentially and alternately overlapped on a core mold, and when the carbon fiber plain cloth and carbon fiber net tires a preset thickness, a crucible preform is prepared through a needling and sewing process; (B) with propylene taken as carbon source gas and argon as a carrier gas, deposition densification is carried out on the preform by adopting a chemical vapor deposition process, and then repeated dipping-high-temperature cracking operation is carried out, so that a crucible green body with preset density can be prepared; c) the crucible green body is machined to prepare a crucible product; and D) gas-phase siliconizing is performed on the crucible product to form a compact silicon carbide coating, so that a finished crucible product is prepared. According to the method, the advantages of filling the internal pores of the preform by each process are fully utilized, and a compact silicon carbide coating is formed on the surface of the crucible product, so that oxidation erosion can be effectively inhibited, and the service life of the crucible is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of crucible preparation, in particular to a method for preparing a carbon / carbon / silicon carbide composite material crucible. Background technique [0002] Carbon / carbon composite material is one of the advanced composite materials widely used at present. It is a composite material formed by carbon fiber or various carbon fabrics to reinforce the carbon matrix. It has low density, high specific strength, wear resistance, high temperature resistance, and thermal expansion. Excellent performance such as small coefficient. This material has now become one of the important basic materials in the fields of aerospace, metallurgy, and new energy, and is an ideal substitute for graphite products and heat-resistant steel. [0003] Graphite crucibles are generally used as tooling in single crystal furnaces. Graphite crucibles have poor mechanical properties and short service life in high-temperature environments, whi...

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