Process Integrated Production of WC-Co Tools with Local Cobalt Gradient Fabricated by Binder Jetting

Maja Lehmann; Michael Zaeh

doi:10.20944/preprints202101.0497.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 22 January 2021 / Approved: 25 January 2021 / Online: 25 January 2021 (13:08:05 CET)

Producing complex shaped tungsten carbide cobalt (WC-Co) tools by classical technologies is difficult and often impossible due to their high hardness and brittle fracture behavior. Additive Manufacturing (AM) is a suitable technology for creating complex structures and simultaneously shortening expensive machining processes. Binder Jetting (BJ) is an innovative AM technology that offers several advantages over laser-based processes, for example low manufacturing costs and high build-up rates. Binders with nanoparticle additives have already proven to be effective in in- creasing the packing density of the powder bed and improving the sintering properties. Addition- ally, they offer the possibility of selectively changing the material composition in the part. This paper presents a concept for the use of nanoparticles to generate gradients in the green compact, which leads to a cobalt gradient in the part after sintering. The possibility of introducing particles locally into complex structures allows local modification of the material properties.

Additive Manufacturing; Binder Jetting

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Process Integrated Production of WC-Co Tools with Local Cobalt Gradient Fabricated by Binder Jetting

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