Article Dans Une Revue Journal of The Australian Ceramic Society Année : 2025

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

Résumé

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.

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hal-05084656 , version 1 (02-12-2025)

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Alejandro Montón Zarazaga, Francis Maury, Geoffroy Chevallier, Claude Estournès, Marc Ferrato, et al.. Core–shell powder strategy for additive manufacturing of ceramics: application to direct powder bed selective laser processing of silicon carbide. Journal of The Australian Ceramic Society, 2025, 61, pp.1545-1555. ⟨10.1007/S41779-025-01191-2⟩. ⟨hal-05084656⟩
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