Fused filament fabrication, debinding and sintering as a low cost additive manufacturing method of 316L stainless steel
Fused filament fabrication, debinding and sintering as a low cost additive manufacturing method of 316L stainless steel
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DOI：
10.1016/j.addma.2019.100861
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发表时间：
2019-12-01
影响因子：
11
通讯作者：
Felfer, Peter
中科院分区：
文献类型：
--
作者：
Thompson, Yvonne;Gonzalez-Gutierrez, Joamin;Felfer, Peter
通过使用包含金属或陶瓷粉末和聚合物粘合剂的丝，可以通过将低成本熔丝制造（FFF）与脱脂和烧结相结合来产生固体金属和陶瓷部件。在这项工作中，我们探索了使用填充有316 L钢粉末的FFF长丝以55体积%的制造路线。我们研究了印刷、脱脂和烧结参数，并根据最终零件的机械性能对其进行了优化。特别关注脱脂和烧结，以获得低残余孔隙率的部件。印刷的绿色体的溶剂脱脂产生互连孔的内部网络，然后进行热脱脂。热脱脂允许完全去除剩余的粘合剂并产生机械稳定的棕色部件。在1360 ℃下烧结提供了部件的致密化，并产生了约20%的几乎各向同性的线性收缩。使用优化的参数，可以通过材料挤出增材制造，脱脂和烧结路线制造密度大于95%的316 L钢部件，在类似于轧制板材的三点弯曲测试中可实现偏转，尽管强度较低。
By using filaments comprising metal or ceramic powders and polymer binders, solid metal and ceramic parts can be created by combining low-cost fused filament fabrication (FFF) with debinding and sintering. In this work, we explored a fabrication route using a FFF filament filled with 316 L steel powder at 55 vol.-%. We investigated the printing, debinding and sintering parameters and optimized them with respect to the mechanical properties of the final part. Special focus was placed on debinding and sintering in order to obtain components of low residual porosity. Solvent debinding of the printed green bodies created an internal network of interconnected pores and was followed by thermal debinding. Thermal debinding allowed for complete removal of the remaining binder and produced mechanically stable brown parts. Sintering at 1360 degrees C provided densification of the parts and generated nearly isotropic linear shrinkage of about 20%. Using optimized parameters, it was possible to fabricate 316 L steel components with a density greater than 95% via the material extrusion additive manufacturing, debinding and sintering route, with achievable deflections in a 3-point bending test similar to rolled sheet material, albeit at lower strength.