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TY  - THES
AU  - von Lintel, Heinrich
TI  - Entwicklung ausscheidungshärtbarer Kupferlegierungen für die additive Fertigung von Hochleistungs-Elektronikbauteilen
PB  - Rheinisch-Westfälische Technische Hochschule Aachen
VL  - Dissertation
CY  - Aachen
M1  - RWTH-2025-07248
SP  - 1 Online-Ressource : Illustrationen
PY  - 2025
N1  - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
N1  - Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2025
AB  - Additive powder bed fusion processes play an increasingly important role in industrial applications. The processing of highly reflective metals such as the copper alloy CuCr1Zr is a focal point of current research. CuCr1Zr is characterized by high electrical conductivity combined with excellent mechanical strength. The additive manufacturing of CuCr1Zr offers new application opportunities thanks to its design freedom and flexibility in material customization. However, the high thermal conductivity and low absorptivity of CuCr1Zr present challenges for the manufacturing process. Previous research has primarily focused on optimizing manufacturing parameters for the well-established Laser Powder Bed Fusion (PBF-LB/M) with a red laser, and on analyzing the mechanical and electrical properties of CuCr1Zr. In contrast, aspects such as the oxidation behavior of the powder have often been overlooked. This study therefore includes comprehensive investigations into the powder production and the oxidation behavior of CuCr1Zr. Furthermore, the processing of the powder using PBF-LB/M with a green laser source is examined and, the tailoring of material properties through targeted alloy design is addressed. Metal powders for additive manufacturing are typically produced via gas atomization. In this context, the atomization of a CuCr1Zr molten jet was analyzed using high-speed imaging to calculate the conditions for secondary atomization as a function of gas pressure. Calorimetric measurements and isothermal oxidation experiments revealed that initial signs of oxidation appear after 42 days in a nitrogen atmosphere at room temperature. The oxide growth follows a logarithmic trend, characterized by the formation and transformation of Cu2O to CuO.A promising approach to improving the processability of copper and its alloys in additive manufacturing involves using a green laser with a wavelength of 530 nm. In this study, suitable processing parameters for PBF-LB/M of CuCr1Zr with a green quasi-continuous wave laser (QCW laser) were determined through design of experiments. A maximum relative density of 99,6 
LB  - PUB:(DE-HGF)11
DO  - DOI:10.18154/RWTH-2025-07248
UR  - https://publications.rwth-aachen.de/record/1017256
ER  -