期刊
MATERIALS & DESIGN
卷 160, 期 -, 页码 262-269出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.09.024
关键词
3D printing; Metallic ink; Environment-friendly; Metallic structures; Secondary metal infiltration
资金
- NSERC (Natural Sciences and Engineering Research Council of Canada) [RGPIN 312568-2013]
- Auto 21 of the Networks of Centres of Excellence of Canada (NCE) program
- China scholarship Council (CSC)
- Fonds de recherche du Quebec - Nature et technologies (FRQNT)
There is an increasing need for 3D printing of metallic structures in a green and cost-effective way. Here, an environment-friendly and reusable metallic ink was developed for an economical metal 3D printing method. The metallic ink is composed of steel micro powders, a biodegradable polymer: chitosan, acetic acid and deionized water. The metal 3D printing method consists of: (i) 3D printing of metallic structures using the metallic ink at room temperature, (ii) thermal treatments on the as-printed structures that decompose the polymer binder and sinter the steel powders, and (iii) an optional step: infiltrating melted copper into the sintered structures to achieve fully dense metal/metal hybrid structures. We demonstrate that any incorrectly built as-printed structures and scrap materials can be recycled and reused for 3D printing by dissolving them again in acetic acid. The fabricated structures after copper infiltration feature a low filament porosity of 1.0% which enables high properties such as an electrical conductivity of 1.3 x 10(6) S/m and a Young's modulus of 160 GPa. The metallic ink can be used for the 3D printing of high performance metallic structures while demonstrating a low environmental impact and a very effective utilization of metallic materials. (C) 2018 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
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