激光烧结中PEKK结晶的演化

L. Benedetti, B. Brûlé, N. Decraemer, K. Evans, O. Ghita
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引用次数: 2

摘要

激光烧结(LS)技术的日益普及增加了可用于该工艺的材料的拓宽。Kepstan 6002聚醚酮酮(PEKK)是最近推出的高性能聚合物级,具有较低的加工温度和独特的结晶动力学。本研究旨在了解激光烧结过程中样品的结晶过程。这些结果与不同冷却速率下的等温和动态差示扫描量热(DSC)实验进行了比较。高温激光烧结(HT-LS)处理的Kepstan 6002 PEKK在DSC中表现出比结晶样品慢10倍的结晶动力学。这一结果强调需要基于零件的结晶研究,而不是等温模型来描述LS中的结晶。透射电子显微镜(TEM)分析显示,经过长时间冷却的样品中球晶较小,而几乎没有冷却的PEKK样品几乎呈无定形结构。本实验确定了激光烧结颗粒的周围环境是晶化起始的优先位置,晶化起始随着颗粒穿透熔融层而增大,形成球晶。Kepstan 6002 PEKK级的结晶动力学较慢,提高了激光烧结层间的附着力,使其能够根据应用定制其性能。了解材料固有特性与最终性能之间的关系对于优化PEKK的工艺和控制PEKK在不同应用中的最终性能至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolution of PEKK crystallization measured in laser sintering
The rising popularity of laser sintering (LS) technology has increased by the broadening of available materials for this process. Kepstan 6002 poly (ether ketone ketone) (PEKK) was recently launched as a high-performance polymer grade with a lower processing temperature and unique crystallization kinetics. This study aims to understand the progress of crystallization on samples manufactured throughout the laser sintering process. These results were compared with isothermal and dynamic differential scanning calorimetry (DSC) experiments with different cooling rates. Kepstan 6002 PEKK processed by high-temperature laser sintering (HT-LS) presents a kinetics of crystallization in the order of ∼10 times slower than its crystallized samples in the DSC. This result highlights the need for a part-based crystallization investigation rather than isothermal models to describe the crystallization in LS. The transmission electron microscopy (TEM) analysis reveals smaller spherulites in the samples subjected to prolonged cooling times and an almost amorphous structure for the PEKK samples exposed to almost no cooling. This experiment identified the surroundings of laser sintered particles as preferential sites for crystallization initiation, which grows as the particles penetrate the molten layers and spherulites are formed. The slower kinetics of crystallization of Kepstan 6002 PEKK grade improve the adhesion between layers in laser sintering and enable tailoring its properties according to the application. Understanding the relationship between intrinsic material characteristics and the resulting final properties is vital to optimizing the process and controlling the final performance of PEKK for different applications.
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