Cf / siC ceramic matrix composite material prepared based on laser near-net-shape forming and preparation method thereof

By employing laser near-net-shape forming technology involving Si powder, SiC powder, and Cf powder mixed with PVA solution, deionized water, and anhydrous ethanol, the problem of preparing complex Cf/SiC ceramic matrix composites in existing technologies has been solved, achieving an efficient and simplified preparation process and excellent performance.

CN118084501BActive Publication Date: 2026-06-02NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Filing Date
2024-02-22
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies are difficult to efficiently prepare Cf/SiC ceramic matrix composites with complex shapes, and the preparation process is cumbersome and time-consuming, resulting in poor quality and high operational difficulty.

Method used

Cf/SiC ceramic matrix composites were prepared by mixing Si powder, SiC powder, and Cf powder with PVA solution, deionized water, and anhydrous ethanol, and then using laser near-net-shape forming technology. The printing parameters were optimized to avoid processes such as pre-preparation followed by debinding and heat treatment.

Benefits of technology

The preparation process has been simplified, the preparation efficiency and material properties have been improved, and efficient integrated forming of complex shaped components has been achieved. The material has low porosity, high strength and excellent performance.

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Abstract

This invention discloses a Cf / SiC ceramic matrix composite material and its preparation method based on laser near-net-shape forming, belonging to the field of additive manufacturing technology. The method disclosed in this invention uses Si powder, SiC powder, and Cf powder mixed with PVA solution, deionized water, and anhydrous ethanol, followed by ball milling to obtain Si-SiC-Cf composite powder as the printing raw material. By designing reasonable printing parameters, Cf / SiC ceramic matrix composite material bulks are prepared based on laser near-net-shape forming technology. The preparation process involved in this method is simple and easy to control, highly repeatable, has a short cycle time, and exhibits excellent performance. It avoids the problems of poor quality, cumbersome operation, and long cycle time caused by processes such as preparing raw preforms followed by debinding and heat treatment. The prepared Cf / SiC ceramic matrix composite material has a porosity of 4%–13%, a nanoindentation hardness of 1.0–12.0 GPa, a compressive strength of 100–400 MPa, and a shear strength of 100–250 MPa. Furthermore, combined with microstructure analysis, it can be seen that the bulk material is uniform and dense, with low porosity and high strength, showing broad application prospects.
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