Preparation method of high-density C / SiC ceramic composite material and product thereof

By optimizing the PIP process, using Pickering emulsion and irregularly shaped carbon fiber braids, and combining heat treatment, the problems of high density and densification in the preparation of C/SiC composite materials were solved, and the efficient preparation of high-performance irregularly shaped C/SiC ceramic composite materials was achieved.

CN120923241APending Publication Date: 2025-11-11HUBEI SANJIANG HANGTIAN JIANGBEI MASCH ENG CO LTD
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Patent Information

Application Number
CN202510977991.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-16
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing technologies for preparing C/SiC composite materials, especially for irregularly shaped structural parts, suffer from problems such as long preparation cycles and difficulty in achieving high density and compaction. The traditional PIP method requires multiple rounds of cyclic impregnation and is difficult to achieve a high density of 2.0 g/cm³ or higher.

Method used

Pickering emulsion was used instead of precursor solution for multiple impregnation and pyrolysis treatments. Combined with polycarbosilane solution and heat treatment, the PIP process was optimized. A special-shaped carbon fiber braid was used, and the material density was improved through machining and supplementary heat treatment.

Benefits of technology

It achieves high density (≥2g/cm³) of irregularly shaped C/SiC ceramic composite materials, shortens the preparation cycle, improves the tensile strength and impact toughness of the material, is suitable for complex components and customized products, and reduces production costs and time.

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Abstract

The invention discloses a preparation method of a high-density C / SiC ceramic composite material and a product thereof, and the preparation method comprises the following steps: 1) carrying out degumming and pyrolytic carbon deposition on a carbon fiber woven body to obtain a preform; (2) preparing a precursor solution by taking polycarbosilane as a precursor, and carrying out multiple times of impregnation and cracking treatment on the preform by adopting a PIP process to obtain a blank of which the density is greater than or equal to 1.75 g / cm < 3 >; (3) preparing a Pickering emulsion by taking silicon carbide as a raw material, and carrying out multiple times of impregnation and cracking treatment on the blank to obtain a blank with the density being greater than or equal to 2.0 g / cm < 3 >; finally, carrying out primary impregnation and pyrolysis treatment by using the precursor solution; according to the method, the density of a finished product sample piece can be effectively improved, the deviation of the special-shaped structure of the product is reduced, the mechanical property of the product is improved, the tensile strength of the obtained product is larger than or equal to 336 Mpa, the impact toughness is larger than or equal to 40 KJ / (m < 2 >), the volume density is larger than or equal to 2 g / cm < 3 >, and the performance requirements of the high-density and high-mechanical-property C / SiC ceramic composite material with the special-shaped structure are met.
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