3D打印用尼龙66/Cu复合粉体的制备与性能

Preparation and Properties of PA66/Cu Composite Powders for 3D Printing

通过溶剂沉淀法制备3D打印用尼龙66(PA66)/Cu复合粉体材料,采用扫描电镜(SEM)、差示扫描量热仪(DSC)、X射线衍射仪(XRD)、激光粒度分析仪和电子万能拉伸机等测试方法,研究了Cu不同加入量对PA66/Cu复合粉体及其烧结件的形貌、热性能、结构、粒度分布和力学性能的影响。由SEM和粒径分析结果发现,Cu的加入使得复合粉体的粒径大幅下降,外观更近似于球形; DSC结果表明,复合粉体结晶速率和烧结窗口温度均大于PA66,有利于SLS 3D打印成型; XRD结果显示,当Cu含量低于0. 5%时,Cu可以完全被包裹在PA66中,并且Cu的加入不会改变PA66的晶体结构;拉伸结果表明,Cu加入量在5. 0%以下时,能够有效改善烧结件的力学性能。

Polyamide 66 （PA66）/Cu composite powder materials for 3D printing were prepared by solvent precipitation method. The morphology, thermal properties, construction, particle size distribution and mechanical property of PA66/Cu composite powders and sintering pieces were studied by scanning electron microscopy（SEM）, differential scanning calorimetry （DSC）, X-ray diffractometer （XRD）, laser particle size analyzer and electronic universal tensile machine and so on. The results show that the particle diameter of composite powders is smaller, and the appearance of the composite powders tends to be more spherulite than PA66 powders by analysis of SEM images and laser particle size distribution instrument. Comparing with the powders of PA66, the rate of crystallization and sintering window temperature of compositelpowders obviously increases measured by DSC, consequently, composite powders are more effective for SLS 3D printing. The results of. XRD show that when the Cu content is less than 0.5 %, Cu could be completely encapsulated in PA66, and the addition of Cu does not change the crystal structure and performance of PA66. The tensile results show that the.mechanical properties of the sintered parts Could be effectively promoted when the addition of Cu is below 5.0 %.