In binder jetting (BJ) additive manufacturing (AM), jetted liquid binder binds powder particles and provides structural integrity to the printed green parts. Following printing, a thermal post-process pyrolyzes the binder and densifies the printed green part. Our emergent research has shown that, while binder is critical for the strength of the printed green part, it can also adversely impact powder densification. In an effort to transform this ‘bug’ into a ‘feature,’ we have experimented with spatially varying binder delivery throughout the printed part to provide volumetric control over final porosity and grain size. In this presentation, we present using this overall technique in printing both copper to stainless steel to improve final part density, increase part strength, reduce total shrinkage, and also impart internal volumetric patterns and features that, when coupled with non-destructive evaluation processes, could find utility as anti-counterfeiting measures.
Learning Objectives:
- Upon completion, participant will be able to describe jetted binder’s effect on final part density, strength, shrinkage, and grain morphology in binder jetting.
- Upon completion, participant will be able to describe a technique for spatially varying binder in order to improve the density of printed parts.
- Upon completion, participant will be able to describe a technique for spatially varying binder in order to embed anti-counterfeiting security features in final printed parts.
