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热压3D打印聚胺复合材料中的多态性和机械行为:压力和温度的影响

John Barber¹, Patricia Revolinsky¹, Jimesh Bhagatji¹

¹Composites Modeling and Manufacturing Group, Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA.

|April 12, 2025

概括

高温压缩通过提高机械性能,显著增强增材制造的碳纤维增强聚胺 (PA6). 这种方法减少了缺陷并增加了结晶性,克服了传统炼的局限性,以获得更好的复合材料性能.

科学领域:

材料科学材料科学材料科学
聚合物工程聚合物工程
增材制造增材制造增材制造

背景情况:

热塑性复合材料的增材制造 (AM) 如碳纤维增强聚胺 (PA6) 通常会导致裂纹和空洞等缺陷.
传统的回火方法可以诱导再结晶,导致材料脆化和机械性能降低.
改善AM热塑性复合材料的机械性能对于其更广泛的应用至关重要.

研究的目的:

研究高温压缩 (HTC) 对增材制造 (AM) 碳纤维增强PA6.6的多态性和机械性能的影响.
确定HTC的最佳压力和温度水平,以提高材料特性.
为了比较HTC与传统火技术的疗效.

主要方法:

用增材制造的碳纤维增强PA6的样品在不同压力和温度条件下经过高温压缩 (HTC).
材料分析包括差异扫描热度计 (DSC),X射线衍射 (XRD),热重力测量分析 (TGA) 和扫描电子显微镜 (SEM).
使用三点曲测试来评估机械行为.

主要成果:

在190°C和80psi的HTC处理时,与原样打印相比,曲模量显著增加47%,强度增加58%.
这些改进归因于减少AM诱导的裂纹,减少空气含量,以及PA6矩阵中的晶体固态过渡.
HTC导致了更高的结晶度和PA6材料中α相的更高比例.

结论:

高温压缩 (HTC) 是一种有效的方法,可以增强增材制造的碳纤维增强PA6的机械性能.
HTC成功地减轻了AM过程中固有的缺陷,并改善了聚胺的晶体结构.
这种技术为传统的回火提供了可行的替代方案,避免了再结晶引起的裂纹和材料脆化等问题,从而释放了AM热塑性复合材料的潜力.

关键词:

通过3D打印打印3D打印.结晶化结晶化的过程.高温压缩的高温压缩方法多形态主义的多态主义.

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