Abstract
Recent advances in metal additive manufacturing (AM) have provided new opportunities for prompt designs of prototypes and facile personalization of products befitting the fourth industrial revolution. In this regard, its feasibility of becoming a green technology, which is not an inherent aspect of AM, is gaining more interests. A particular interest in adapting and understanding of eco-friendly ingredients can set its important groundworks. Here, we demonstrate a water-based solid-phase binding agent suitable for binder jetting 3D printing of metals. Sodium salts of common fruit acid chelators form stable metal-chelate bridges between metal particles, enabling elaborate 3D printing of metals with improved strengths. Even further reductions in the porosity between the metal particles are possible through post-treatments. A compatibility of this chelation chemistry with variety of metals is also demonstrated. The proposed mechanism for metal 3D printing can open up new avenues for consumer-level personalized 3D printing of metals.
Highlights
Recent advances in metal additive manufacturing (AM) have provided new opportunities for prompt designs of prototypes and facile personalization of products befitting the fourth industrial revolution
The Al powder is classified with ST3 explosive ratings, which can pose a potential danger for Al powder-based systems
(PAM)[58], polyvinyl pyrrolidone (PVP)[59], and maltodextrin[37], some of which were adopted from successful demonstrations in the field of ceramic BJ3DPs for biomedical applications[58]
Summary
Recent advances in metal additive manufacturing (AM) have provided new opportunities for prompt designs of prototypes and facile personalization of products befitting the fourth industrial revolution In this regard, its feasibility of becoming a green technology, which is not an inherent aspect of AM, is gaining more interests. As a groundwork for BJM3DP to become a more accessible green technology adequate for both industrial and personalized uses such as rapid prototyping, one of the important aspects to be explored is adapting and understanding of environmentally friendly ingredients including binder materials. Objects of various shapes are printed using various metals, which demonstrates that the proposed chelator-assisted BJM3DP technique is useful for the realization of complex and sophisticated architectures and applicable to a wide range of metal powders. The environmentally friendly chelator presented is expected to promote greener metal 3D printers adequate for both industrial and consumer-level scale applications
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