LPBF增材制造CF/PEEK复合材料的微观结构演变及各向异性力学性能

IF 7.7 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Shuai Zhao, Jingpeng Luo, Jiaming Bai
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引用次数: 0

摘要

激光粉末床熔融(LPBF)是一种很有前途的增材制造技术,用于制造高性能碳纤维增强聚醚醚酮(CF/PEEK)复合材料。本研究系统地研究了它们的可加工性、微观组织演变和各向异性行为。休止角(AOR)测量证实,含高达15% CF的复合材料保持良好的流动性,适用于LPBF。热分析表明,CF的掺入对PEEK的熔融行为影响不大,但提高了PEEK的热稳定性,缩小了PEEK的结晶窗口。力学测试表明,在25 W的激光功率下,15 wt%的CF/PEEK复合材料的抗拉强度为119.8 MPa,弹性模量为8.0 GPa,同时孔隙率降低(2.12%),反映了有效的致密化。XRD分析进一步揭示了晶格参数变化与力学性能之间的强相关性,突出了晶体结构的作用。由于重涂过程引起的纤维排列,观察到明显的各向异性:拉伸强度遵循x- >; xy- >; y方向的顺序,而15 wt%复合材料的导热系数沿x和y方向分别比纯PEEK提高了343%和109%。这些发现有助于更清楚地了解lpbf制造的CF/PEEK复合材料的加工条件、微观结构特征和性能之间的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure evolution and anisotropic mechanical performance of CF/PEEK composites fabricated by LPBF additive manufacturing
Laser Powder Bed Fusion (LPBF) has emerged as a promising additive manufacturing technique for fabricating high-performance carbon fiber-reinforced polyetheretherketone (CF/PEEK) composites. This study systematically investigates their processability, microstructural evolution, and anisotropic behavior. Angle of repose (AOR) measurements confirmed that composites containing up to 15 wt%CF maintained good flowability suitable for LPBF. Thermal analysis revealed that CF incorporation had little effect on the melting behavior of PEEK, while enhancing thermal stability and narrowing the crystallization window. Mechanical testing demonstrated that optimal performance was achieved at a laser power of 25 W, where the 15 wt%CF/PEEK composite exhibited a tensile strength of 119.8 MPa and an elastic modulus of 8.0 GPa, accompanied by reduced porosity (2.12 %) that reflects effective densification. XRD analysis further revealed strong correlations between lattice parameter variations and mechanical performance, highlighting the role of crystalline structure. Pronounced anisotropy was observed due to fiber alignment induced by the recoating process: tensile strength followed the order x- > xy- > y- orientation, while thermal conductivity of the 15 wt% composite increased by 343 % and 109 % along the X and Y directions, respectively, compared with pure PEEK. These findings contribute to a clearer understanding of the relationships between processing conditions, microstructural features, and performance in LPBF-fabricated CF/PEEK composites.
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来源期刊
Composites Communications
Composites Communications Materials Science-Ceramics and Composites
CiteScore
12.10
自引率
10.00%
发文量
340
审稿时长
36 days
期刊介绍: Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.
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