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首页> 外文会议>North American Thermal Analysis Society conference >Polymer Powders Ageing Characterization in Additive Manufacturing
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Polymer Powders Ageing Characterization in Additive Manufacturing

机译：增材制造中聚合物粉末的老化表征

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Granular materials and fine powders are widely used in several Additive Manufacturing (AM) applications. For example, in SLS (Selective Laser Sintering), SLM (Selective Laser Melting) and EBM (Electron Beam Melting) techniques, successive thin layers of powders are created with a ruler or with a rotating cylinder. Each layer is partially sintered or melted with and energy beam (laser or electron beam). The layer thickness defines a vertical resolution. Therefore, a thin-layer leads to a better resolution However, once the polyamide12 (PA 12) part is printed, several different industries recycle the used powder by mixing it with the fresh one at a define ratio (usually 50/50). A SLS powder grades Polyamide 2200 (PA 12) powder was selected during this study, this sample was provided by EOS (Krailling, Deutschland) and processed by Materialise (Leuven, Belgium). This polyamide 12 is investigated in its virgin, recycled form. A mix of PA 12 Virgin and Recycled (50% of sieved Virgin and sieved Recycled) will be also investigated. Virgin material is processable with the necessary attention (tendency to warp/curl upon solidification) and gives very good part properties in terms of porosity and mechanical resistance. After recycling the material, it can be processed with ease (less warpage) but will have inferior properties. Therefore, in this paper, three different techniques will be presented to quantify the compaction dynamics, the spreadability and also the electrical charges acquire by these powders. These instruments allow, not only, to foretell the powders behaviour inside a 3D printer, but also, to optimise the products process-ability.
机译：粒状材料和细粉被广泛用于几种增材制造（AM）应用中。例如，在SLS（选择性激光烧结），SLM（选择性激光熔炼）和EBM（电子束熔炼）技术中，连续的粉末薄层是通过直尺或旋转圆柱体形成的。每一层用能量束（激光或电子束）部分烧结或熔化。层厚度定义垂直分辨率。因此，薄层可带来更好的分辨率。但是，一旦印刷了聚酰胺12（PA 12）零件，几个不同的行业就会通过将使用过的粉末与新鲜粉末以确定的比例（通常为50/50）混合来回收使用的粉末。在本研究中选择了SLS粉末等级的聚酰胺2200（PA 12）粉末，该样品由EOS（德国Krailling）提供，并由Materialize（比利时鲁汶）加工。研究了这种聚酰胺12的原始回收形式。还将研究PA 12初榨和再生的混合料（50％的过筛初榨和过筛的再生料）。原始材料可以在需要注意的情况下进行加工（固化时容易发生翘曲/卷曲），并且在孔隙率和机械强度方面具有非常好的零件性能。回收材料后，可以轻松进行加工（减少翘曲），但性能较差。因此，在本文中，将提出三种不同的技术来量化这些粉末的压实动力学，可铺展性以及电荷。这些仪器不仅可以预测3D打印机内部的粉末行为，而且还可以优化产品的加工能力。

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