ABSTRACT Selective laser sintering (SLS) is a branch of additive manufacturing based on powders. The research was carried out to demonstrate the sintering feasibility of ultra-high molecular weight polyethylene (UHMWPE) and the evaluation of the parts of the mechanical property prepared by SLS at various laser powers was also conducted. Meanwhile, the morphology of the parts was examined through scanning electron microscopy. Additionally, products with high three-dimensional stability were obtained via SLS with UHMWPE/SiO2. The effects of silica and laser power on the products’ relative density, dimensional accuracy and tensile property were then discussed. The incorporation of the silica reduces the difficulties in sintering the UHMWPE powder and eliminates the slice slides (layer slides between two closely packed layers) in the sintering process. However, the mechanical property decreased with the addition of the SiO2 into the powder. Meanwhile, the properties of parts show high relevance with the laser power.

中文翻译：

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选择性激光烧结提高超高分子量聚乙烯的可行性和力学性能

摘要 选择性激光烧结 (SLS) 是基于粉末的增材制造的一个分支。该研究旨在证明超高分子量聚乙烯 (UHMWPE) 的烧结可行性，并对 SLS 制备的零件在不同激光功率下的机械性能进行了评估。同时，通过扫描电子显微镜检查零件的形貌。此外，通过 SLS 与 UHMWPE/SiO2 获得了具有高三维稳定性的产品。然后讨论了二氧化硅和激光功率对产品相对密度、尺寸精度和拉伸性能的影响。二氧化硅的加入降低了烧结 UHMWPE 粉末的难度，并消除了烧结过程中的切片滑动（两个紧密堆积的层之间的层滑动）。然而，随着 SiO2 加入粉末中，机械性能下降。同时，零件的性能与激光功率高度相关。