Fundamental in-situ Investigations on the Changes of Particle Properties during Powder Bed Fusion of Cu-based materials using a Laser Beam, Depending on the Atmosphere and the Exposure Parameters

使用激光束进行铜基材料粉末床熔融过程中颗粒特性随大气和曝光参数变化的基础原位研究

• 批准号: 508745195
• 负责人: Professor Dr.-Ing. Arne Röttger
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik I
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/508745195?language=en
• 关键词: Fundamental; situ; Investigations; Changes; Particle

The overarching goal is to develop a basic understanding of the influence of changes in particle properties in the Powder Bed Fusion (PBF) process of pure Cu-powder and the associated influence on the laser energy coupling, the microstructure formation process, and the associated mechanical, and physical properties. This project focuses on the absorption of oxygen by Cu-powder surfaces, investigations on the change in powder properties and their influence on reusability and the necessary process-technical adjustments concerning powder conditioning (recycling) and the exposure parameters or the process gas atmosphere. Therefore, high-resolution in-situ X-ray diffraction experiments will be carried out to investigate the interactions occurring in the PBF-process between the bulk powder with specific and well-known properties, the process gas atmosphere, and the laser beam. The knowledge gained will be used to derive measures (targeted aging of powder surfaces by pre-oxidation, recycling) which allow reproducible PBF processing of Cu-bulk powder. Targeted surface conditioning through the formation of oxides, and the deposition of thin Ni-layers is intended to increase laser absorption, which on the one hand, contributes to increasing the process speed and, on the other hand, enables the PBF-processing of materials with high reflectivity (Cu) for the lasers typically used today (wavelength ≈1060 nm). It will also be investigated whether the melt viscosity (smooth surfaces and minor post-processing by machining) can be influenced by the introduction of oxygen (by particle oxidation, via the process gas by using mixed gases) into the PBF-process. The aforementioned scientific questions with high technological relevance are answered in a project consortium, in which the competences concerning powder processing and the evaluation of powder properties (HAM), the characterization of the microstructure and the associated material properties (FUW), and the in-situ re-melting tests and aging tests for mapping the oxidation and reduction kinetics of bulk powder (FPTUDo) are available.

首要目标是发展的影响的颗粒特性的变化的影响，在粉末床融合（PBF）过程中的纯铜粉末和激光能量耦合，微观结构形成过程中的相关影响的基本理解，以及相关的机械和物理性能。该项目的重点是铜粉末表面对氧气的吸收，研究粉末性能的变化及其对可重复使用性的影响，以及有关粉末调节（回收）和暴露参数或工艺气体气氛的必要工艺技术调整。因此，将进行高分辨率的原位X射线衍射实验，以研究在PBF过程中发生的具有特定和已知特性的散装粉末、工艺气体气氛和激光束之间的相互作用。所获得的知识将用于导出措施（通过预氧化、回收对粉末表面进行有针对性的老化），这些措施允许对Cu散装粉末进行可再现的PBF处理。通过形成氧化物和沉积薄Ni层进行有针对性的表面处理旨在增加激光吸收，这一方面有助于提高加工速度，另一方面能够对当今常用激光器（波长约1060 nm）进行高反射率（Cu）材料的PBF加工。还将研究熔体粘度（光滑表面和通过机械加工的微小后处理）是否会受到将氧气（通过颗粒氧化，通过使用混合气体经由工艺气体）引入PBF工艺的影响。上述具有高度技术相关性的科学问题在一个项目联盟中得到了回答，其中涉及粉末加工和粉末性能评估（HAM），微观结构和相关材料性能表征（FUW）以及用于绘制散装粉末氧化和还原动力学的原位重熔测试和老化测试（FPTUDo）。