3D printing has witnessed a remarkable surge in popularity due to its flexibility in design and adaptability as a manufacturing technique to nearly each industrial area. This study focuses on harnessing the technological versatility of 3D printing by utilizing both standard poly lactic acid (PLA) and copper powder-doped PLA to fabricate intricate structures through a layer-by-layer additive manufacturing process. The other innovation introduced here lies in the postprocessing step, which involves salt remelting. The mechanical properties of 3D-printed standard test specimens undergo comprehensive assessment, encompassing bending and tensile evaluations, hardness measurements, density assessments, dimensional stability analyses, and wear resistance examinations. Utilizing copper powder-doped PLA for the initial and final layers in XYZ-oriented prints enables multimaterial printing, resulting in an ≈14% increase in tensile strength. Subsequently, subjecting this multimaterial composite to salt remelting elevates the strength enhancement to ≈16%, accompanied by a significant boost in rigidity by reducing voids in cross-sectional area. In addition, scanning electron microscope images are captured, allowing for a detailed morphological analysis, which is then correlated with the findings of the various tests performed. This research unveils the potential of 3D printing technology in crafting materials with tailored mechanical properties, advancing its applicability in numerous industrial sectors.

中文翻译：

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分析多材料 3D 打印和后处理对机械和摩擦学特性的影响

3D 打印由于其设计灵活性和作为一种制造技术几乎适用于每个工业领域的适应性而迅速普及。这项研究的重点是利用 3D 打印技术的多功能性，利用标准聚乳酸 (PLA) 和铜粉掺杂的 PLA，通过逐层增材制造工艺制造复杂的结构。这里介绍的另一项创新在于后处理步骤，其中涉及盐重熔。 3D打印标准测试样本的机械性能经过全面评估，包括弯曲和拉伸评估、硬度测量、密度评估、尺寸稳定性分析和耐磨性检查。在 XYZ 方向打印的初始层和最终层中使用铜粉掺杂的 PLA 可以实现多材料打印，从而使拉伸强度增加约 14%。随后，对这种多材料复合材料进行盐重熔，将强度提高到约 16%，同时通过减少横截面积中的空隙来显着提高刚性。此外，还捕获扫描电子显微镜图像，以便进行详细的形态分析，然后将其与所进行的各种测试的结果相关联。这项研究揭示了 3D 打印技术在制造具有定制机械性能的材料方面的潜力，从而提高了其在众多工业领域的适用性。