Core–shell powder strategy for additive manufacturing of ceramics: application to direct powder bed selective laser processing of silicon carbide

Montón, Alejandro ; Maury, Francis ; Chevallier, Geoffroy ; Estournès, Claude ; Ferrato, Marc ; Grossin, David

Resumen: The production of innovative ceramic powders through surface functionalization of grains, featuring a core–shell structure, accelerates mass diffusion and enhances sintering behavior. This approach significantly impacts the additive manufacturing field. In this study, a commercial SiC preceramic compound from the polycarbosilane family, specifically poly(silaethylene), was grafted onto the surface of Silicon Carbide (SiC) particles, forming a conformal molecular layer. Powder Bed Selective Laser Processing, also known as Selective Laser Sintering/Melting, was employed to fabricate 3D SiC and surface-modified SiC parts, enabling a comparative analysis of the efficiency and impact of surface modification in the manufacturing process. The surface functionalization increases densification by at least 5% without affecting the final phases of the manufactured parts. Additionally, Spark Plasma Sintering (SPS) was employe as a post-treatment to further densify the samples, increasing their final density and eliminating residual silicon and carbon, which are produced due to the undesired decomposition of SiC during the manufacturing process.

Idioma: Inglés

DOI: 10.1007/s41779-025-01191-2

Año: 2025

Publicado en: Journal of the Australian Ceramic Society (2025), [11 pp.]
ISSN: 2510-1560

Financiación: info:eu-repo/grantAgreement/EC/H2020/764935/EU/ Development Of Ceramics 3D-Printing, Additive Manufacturing /DOC-3D-PRINTING

Tipo y forma: Artículo (Versión definitiva)