Sommereyns Alexander, Gann Stan, Schmidt Jochen, Chehreh Abootorab Baqerzadeh, Lüddecke Arne, Walther Frank, Gökce Bilal, Barcikowski Stephan, Schmidt Michael
Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Konrad-Zuse-Str. 3/5, 91052 Erlangen, Germany.
Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Paul-Gordan-Str. 6, 91052 Erlangen, Germany.
Materials (Basel). 2021 Sep 15;14(18):5322. doi: 10.3390/ma14185322.
The great interest, within the fields of research and industry, in enhancing the range and functionality of polymer powders for laser powder bed fusion (LB-PBF-P) increases the need for material modifications. To exploit the full potential of the additivation method of feedstock powders with nanoparticles, the influence of nanoparticles on the LB-PBF process and the material behavior must be understood. In this study, the impact of the quantity and dispersion quality of carbon nanoparticles deposited on polyamide 12 particles is investigated using tensile and cubic specimens manufactured under the same process conditions. The nano-additives are added through dry coating and colloidal deposition. The specimens are analyzed by tensile testing, differential scanning calorimetry, polarized light and electron microscopy, X-ray diffraction, infrared spectroscopy, and micro-computed tomography. The results show that minute amounts (0.005 vol%) of highly dispersed carbon nanoparticles shift the mechanical properties to higher ductility at the expense of tensile strength. Despite changes in crystallinity due to nano-additives, the crystalline phases of polyamide 12 are retained. Layer bonding and part densities strongly depend on the quantity and dispersion quality of the nanoparticles. Nanoparticle loadings for CO laser-operated PBF show only minor changes in material properties, while the potential is greater at lower laser wavelengths.
在研究和工业领域，人们对提高用于激光粉末床熔融（LB-PBF-P）的聚合物粉末的范围和功能有着浓厚兴趣，这增加了对材料改性的需求。为了充分发挥用纳米颗粒对原料粉末进行添加剂处理方法的潜力，必须了解纳米颗粒对LB-PBF工艺和材料行为的影响。在本研究中，使用在相同工艺条件下制造的拉伸和立方试样，研究了沉积在聚酰胺12颗粒上的碳纳米颗粒的数量和分散质量的影响。通过干涂层和胶体沉积添加纳米添加剂。通过拉伸试验、差示扫描量热法、偏振光和电子显微镜、X射线衍射、红外光谱和微计算机断层扫描对试样进行分析。结果表明，微量（0.005体积%）高度分散的碳纳米颗粒会使机械性能向更高的延展性转变，但以拉伸强度为代价。尽管纳米添加剂会导致结晶度发生变化，但聚酰胺12的结晶相得以保留。层间结合和部件密度强烈取决于纳米颗粒的数量和分散质量。对于CO激光操作的PBF，纳米颗粒负载量仅使材料性能发生微小变化，而在较低激光波长下潜力更大。
