Development of Nanoparticle-Containing Inks for Binder Jetting of Inconel 718 Alloy and Their Effects on Microstructural and Mechanical Properties

Date

2026-7-31

Author

Yıldız, Yavuz

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This study aims to present a comprehensive approach for the development of nanoparticle-containing inks for metal binder jetting and the influence of nanoparticle incorporation on densification, microstructural evolution, and mechanical response of Inconel 718 (IN718). Stable and printable inks were produced through careful selection of dispersant, rheological optimization, and particle size refinement. The formulation was intentionally designed to have low organic content to avoid contamination associated with binder-rich systems. With optimized printing conditions by a custom-made binder jetting machine, despite low binder content, produced IN718 green bodies exhibited sufficient geometrical and mechanical stability; moreover, nanoparticles formed interparticle bridges between micron-sized IN718 powders, thereby promoting enhanced sintering activity and densification with chemical composition remaining within the ASTM limits. Compared to widely utilized vacuum sintering, argon sintering through hot-insertion of the green bodies yielded near-fully dense IN718 components. Microstructural characterization revealed the effects of nanoparticle incorporation on pore elimination, removal efficiency of carbonaceous byproducts, and grain structure of the as-sintered products. The resulting as-sintered parts exhibited high microhardness comparable to as-built counterparts produced by laser-powder bed fusion, demonstrating the potential of binder jetting as a competitive additive manufacturing route for functional IN718 parts. After solutionizing and double aging, the effect of nanoparticle incorporation became more evident as the microhardness and compressive yield strength increased by 36% and 33%, respectively, implying beneficial alteration of precipitation strengthening response by nanoparticles. Overall, this study establishes nanoparticle-assisted ink development as an effective strategy for improving the final properties of binder jetted IN718.

Subject Keywords

Additive Manufacturing, Binder Jetting, Inconel 718, Ink Development, Sintering and Densification

URI

https://hdl.handle.net/11511/120044

Collections

Graduate School of Natural and Applied Sciences, Thesis