Large area projection sintering (LAPS) promises to be a new method in the field of additive manufacturing. Developed in the Mechanical Engineering Department, University of South Florida, LAPS uses long exposure times over a broad area of powder to fuse into dense, reproducible materials. In contrast, LS, a common powder‐based additive manufacturing, uses a focused beam of light scanned quickly over the material. Local regions of concentrated high‐energy bursts of light lead to higher peak temperatures and differing cooling dynamics and overall crystallinity. The mechanical properties of laser sintered specimens suffer because of uneven particle fusion. LAPS offers the capacity to fine‐tune fusion properties through enhanced thermodynamic control of the heating and cooling profiles for sintering. Further research is required to identify the relationship between LAPS build settings and part properties to enable the fabrication of custom parts with desired properties. This study examines the influence of LAPS sintering parameters on chemical structures, crystallinity, mechanical, and thermal properties of polyamide‐12 specimens using powder X‐ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry, small‐angle X‐ray scattering, scanning electron microscopy, and microhardness testing. It was observed that higher crystallinity was imparted to specimens that were sintered for a shorter time and vice versa.

中文翻译：

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通过投影烧结在各种烧结参数下制备的PA-12样品的表征

大面积投影烧结（LAPS）有望成为增材制造领域的一种新方法。LAPS由南佛罗里达大学机械工程系开发，在很宽的粉末区域使用较长的曝光时间即可融合成致密的，可复制的材料。相比之下，LS是一种常见的粉末状增材制造，它使用聚焦的光束在材料上快速扫描。集中的高能量光脉冲的局部区域导致较高的峰值温度以及不同的冷却动力学和整体结晶度。激光烧结样品的机械性能由于不均匀的颗粒融合而受到损害。LAPS通过增强对烧结的加热和冷却曲线的热力学控制，提供了微调熔合性能的能力。需要进一步的研究来确定LAPS构造设置与零件特性之间的关系，以制造具有所需特性的定制零件。这项研究使用粉末X射线衍射，傅立叶变换红外光谱，差示扫描量热法，小角度X射线散射，扫描法研究了LAPS烧结参数对聚酰胺12样品的化学结构，结晶度，机械和热性能的影响电子显微镜和显微硬度测试。观察到较高的结晶度赋予了在较短时间内烧结的样品，反之亦然。使用粉末X射线衍射，傅立叶变换红外光谱，差示扫描量热法，小角度X射线散射，扫描电子显微镜和显微硬度测试，可测定聚酰胺12样品的结晶度，机械性能和热性能。观察到较高的结晶度赋予了在较短时间内烧结的样品，反之亦然。使用粉末X射线衍射，傅立叶变换红外光谱，差示扫描量热法，小角度X射线散射，扫描电子显微镜和显微硬度测试，可测定聚酰胺12样品的结晶度，机械性能和热性能。观察到较高的结晶度赋予了在较短时间内烧结的样品，反之亦然。