Additive Manufacturing of High Mechanical Strength Continuous Cf/SiC Composites using a 3D Extrusion Technique and Polycarbosilane-Coated Carbon Fibers

Abstract

A Novel Additive Manufacturing Approach is Herein Reported for Manufacturing High Mechanical Strength Continuous Carbon Fiber-Reinforced Silicon Carbide (Cf/SiC) Composite Materials. Continuous Carbon Fibers Were Coated with Polycarbosilane (PCS) using a Colloidal Evaporative Deposition Process and Then Coextruded with High Solid Content SiC Ink. the Zeta Potential of the SiC Ink Was Adjusted to Optimize the Printing Ability of the Suspension. during Sintering, Small SiC Grains and Whiskers Were Generated in the Gaps in and Around the PCS-Coated Carbon Fibers, Which Led to the Improved Flexural Strength and Density of the Composites. Meanwhile, the PCS Coating on the Surface of the Carbon Fibers Prevented the Carbon Fibers from Reacting with SiO Gas Generated by Reactions between the SiC Matrix and SiO2 and Sintering Additives (Al2O3 and Y2O3), Effectively Preserving the Structural Integrity of the Carbon Fibers. Compared to the SiC Specimens Containing Uncoated Carbon Fibers, the Density of the Specimens Fabricated with Coated Carbon Fibers Was Increased from 2.51 to 2.85 G/cm3, and the Strength Was Increased from 190 to 232 MPa.

Department(s)

Mechanical and Aerospace Engineering

Second Department

Materials Science and Engineering

Comments

U.S. Nuclear Regulatory Commission, Grant NRC 31310018M0044

Keywords and Phrases

3D extrusion-based technique; C /SiC composite f; continuous carbon fiber; mechanical strength; polycarbosilane

International Standard Serial Number (ISSN)

1551-2916; 0002-7820

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Wiley, All rights reserved.

Publication Date

01 Jan 2023

Link to Full Text

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