Shbanah Mariam, Jordanov Márton, Nyikes Zoltán, Tóth László, Kovács Tünde Anna
Doctoral School on Materials Sciences and Technologies, Óbuda University, Bécsi út 96/B, 1034 Budapest, Hungary.
Bánki Donát Faculty of Mechanical and Safety Engineering, Óbuda University, Népszínház u. 8., 1081 Budapest, Hungary.
Polymers (Basel). 2023 Mar 22;15(6):1587. doi: 10.3390/polym15061587.
Three-dimensional printing is a useful and common process in additive manufacturing nowadays. The advantage of additive polymer technology is its rapidity and design freedom. Polymer materials' mechanical properties depend on the process parameters and the chemical composition of the polymer used. Mechanical properties are very important in product applicability. The mechanical properties of polymers can be enhanced by heat treatment. Additive-manufactured PLA's mechanical properties and structure can be modified via heat treatment after the 3D printing process. The goal of this research was to test the effect of heat treatment on the mechanical and structural parameters of additive-manufactured PLA. This was achieved via the FDM processing of standard PLA tensile test specimens with longitudinal and vertical printing orientations. After printing, the test specimens were heat-treated at 55 °C, 65 °C and 80 °C for 5 h and after being held at 20 °C for 15 h. The printed and heat-treated specimens were tested using tensile tests and microscopy. Based on the test results, we can conclude that the optimal heat treatment process temperature was 65 °C for 5 h. Under the heat treatment, the test specimens did not show any deformation, the tensile strength increased by 35% and the porosity of the PLA structure decreased.
如今，三维打印是增材制造中一种有用且常见的工艺。添加剂聚合物技术的优势在于其快速性和设计自由度。聚合物材料的机械性能取决于工艺参数和所用聚合物的化学成分。机械性能在产品适用性方面非常重要。聚合物的机械性能可通过热处理得到增强。在3D打印过程之后，增材制造的聚乳酸（PLA）的机械性能和结构可通过热处理进行改性。本研究的目的是测试热处理对增材制造的聚乳酸（PLA）的机械和结构参数的影响。这是通过对具有纵向和垂直打印方向的标准聚乳酸（PLA）拉伸试验样品进行熔融沉积成型（FDM）加工来实现的。打印后，将试验样品在55℃、65℃和80℃下热处理5小时，然后在20℃下保持15小时。使用拉伸试验和显微镜对打印并热处理后的样品进行测试。基于测试结果，我们可以得出结论，最佳热处理工艺温度为65℃，持续5小时。在热处理条件下，试验样品未出现任何变形，拉伸强度提高了35%，聚乳酸（PLA）结构的孔隙率降低。
