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Validation of a low-cost selective powder deposition process through the characterization of tin bronze specimens
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications ( IF 2.4 ) Pub Date : 2021-08-23 , DOI: 10.1177/14644207211031941
Samuel Magalhães 1 , Manuel Sardinha 2 , Carlos Vicente 1 , Marco Leite 1 , Relógio Ribeiro 1 , Maria Vaz 1 , Luís Reis 1
Affiliation  

Additive manufacturing technologies are becoming increasingly popular due to their advantages over traditional subtracting manufacturing technologies. Despite advances in this field, fixed and maintenance costs for additive manufacturing with metals remain high. The introduction of low-cost metal machines in the additive manufacturing market considerably reduces the cost of acquiring and maintaining this type of equipment. This work aims to establish the process requirements for a low-cost selective powder deposition process, and validate it through the production of specimens in the laboratory and evaluate their mechanical properties. Tin bronze specimens were produced under different manufacturing conditions, namely powder dimensions, type of crucible and coke, firing segments and casting strategy. The morphology and chemical composition of the specimens were carried out combining the scanning electron microscopy and energy dispersive X-Ray spectroscopy techniques, respectively. It was observed that crucibles and coke with impurities that react with the metal powders and infill in a reducing atmosphere have influence in the final quality of parts. Tested samples displayed high variability of results which can be correlated with different manufacturing conditions. The selection of the appropriate print parameters led to the manufacture of tin bronze specimens with mechanical properties comparable to those reported in the literature. Overall, low-cost selective powder deposition is a promising technology, if identified manufacturing issues are addressed.



中文翻译:

通过锡青铜样品的表征验证低成本的选择性粉末沉积工艺

增材制造技术因其优于传统减材制造技术的优势而变得越来越流行。尽管该领域取得了进展,但金属增材制造的固定和维护成本仍然很高。在增材制造市场引入低成本金属机器大大降低了购买和维护此类设备的成本。这项工作旨在建立低成本选择性粉末沉积工艺的工艺要求,并通过在实验室中生产样品对其进行验证并评估其机械性能。锡青铜试样是在不同的制造条件下生产的,即粉末尺寸、坩埚和焦炭的类型、烧成段和铸造策略。分别结合扫描电子显微镜和能量色散 X 射线光谱技术对样品的形貌和化学成分进行了测定。据观察,坩埚和带有杂质的焦炭会与金属粉末反应并填充在还原气氛中,这会影响零件的最终质量。测试样品显示结果的高度可变性,这可能与不同的制造条件相关。选择合适的印刷参数可以制造出机械性能与文献报道相当的锡青铜试样。总的来说,如果确定的制造问题得到解决,低成本的选择性粉末沉积是一项很有前途的技术。

更新日期:2021-08-23
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