Idriss Aboubaker I B, Li Jian, Guo Yanling, Shuhui Tong, Wang Yangwei, Elfaki Elkhawad A, Ahmed Gafer A
College of Mechanical and Electrical Engineering, Department of Mechanical Engineering, Northeast Forestry University, Harbin, China.
Department of Mechanical Engineering, Faculty of Engineering Science, University of Nyala, Nyala, Sudan.
3D Print Addit Manuf. 2023 Aug 1;10(4):697-710. doi: 10.1089/3dp.2021.0118. Epub 2023 Aug 9.
The current available selective laser sintering (SLS) materials are often high in cost and limited in variety; the mechanical properties of wood-composite SLS parts are low quality, which restricts the development of SLS technology. This article aims to optimize the SLS processing parameters to enhance the mechanical properties of the Prosopis chilensis powder (PCP)/polyethersulfone (PES) composite (PCPC) part fabricated via SLS. The PCP and PES powder were proposed as the feedstock of the PCPC powder bed for SLS. First, the thermal decomposition and glass transition temperatures (Tg) of PCP and PES powder were estimated to reduce the produced PCPC parts from warping and deformation during SLS. An orthogonal experimental methodology with five factors and four levels was used to optimize the SLS parameters for the PCPC SLS test. The scanning speed, preheating temperature, and laser power are selected as the main affecting factors on this study. The influence of these factors on dimension accuracies, bending and tensile strengths, and surface roughness quality of the produced PCPC parts was studied. The PCPC particle distribution and microstructure were inspected via scanning electron microscopy. Furthermore, the synthesis weighted scoring methods were utilized to determine the optimal SLS processing parameters of the produced PCPC parts. The combined results of tests showed that the optimal SLS parameters were as follows: the scanning speed is 1.8 m/s, preheating temperature is 80°C, and the laser power is 12 W. Thus, the quality of PCPC SLS parts was significantly enhanced when the optimal parameters were utilized in the SLS process. This article provided the main reference values of SLS parameters of the PCPC. To further enhance the surface roughness quality and mechanical strengths, the postprocessing infiltration with wax was introduced; after wax infiltration, the surface roughness and mechanical strengths were significantly improved.
目前可用的选择性激光烧结（SLS）材料通常成本高昂且种类有限；木质复合材料SLS零件的机械性能较差，这限制了SLS技术的发展。本文旨在优化SLS工艺参数，以提高通过SLS制造的智利牧豆树粉末（PCP）/聚醚砜（PES）复合材料（PCPC）零件的机械性能。提出将PCP和PES粉末作为用于SLS的PCPC粉末床的原料。首先，估算PCP和PES粉末的热分解温度和玻璃化转变温度（Tg），以减少SLS过程中生产的PCPC零件的翘曲和变形。采用五因素四水平的正交试验方法来优化PCPC SLS试验的SLS参数。选择扫描速度、预热温度和激光功率作为本研究中的主要影响因素。研究了这些因素对所生产的PCPC零件的尺寸精度、弯曲和拉伸强度以及表面粗糙度质量的影响。通过扫描电子显微镜检查PCPC颗粒分布和微观结构。此外，利用综合加权评分方法确定所生产的PCPC零件的最佳SLS工艺参数。试验的综合结果表明，最佳SLS参数如下：扫描速度为1.8 m/s，预热温度为80°C，激光功率为12 W。因此，在SLS过程中使用最佳参数时，PCPC SLS零件的质量得到了显著提高。本文提供了PCPC的SLS参数的主要参考值。为了进一步提高表面粗糙度质量和机械强度，引入了蜡后处理渗透；蜡渗透后，表面粗糙度和机械强度得到了显著改善。
