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TY - THES AU - Stachowski, Nina Isabell Inge TI - Triboaktive Beschichtungen aus CrAlVN und CrAlMoN für den Einsatz in der Drehbearbeitung von TiAl6V4 VL - 82 PB - RWTH Aachen University VL - Dissertation CY - Düren M1 - RWTH-2025-02745 SN - 978-3-8440-9796-2 T2 - Schriftenreihe Oberflächentechnik SP - 1 Online-Ressource : Illustrationen PY - 2025 N1 - Druckausgabe: 2025. - Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University N1 - Dissertation, RWTH Aachen University, 2024 AB - The titanium alloy TiAl6V4 enables a considerable increase of performance in various branches of industry. However, machining this alloy poses a significant challenge due to its properties. The low thermal conductivity of λ = 5.8 W/mK and the low elastic modulus of 110 GPa ≤ E ≤ 140 GPa in conjunction with the high yield strength Rp0.2 = 870 N/mm2 lead to high temperatures, mechanical loads and self-excited vibrations on the tool cutting edge. As a result of these high loads, rapidly progressive tool wear and premature tool failure occur. Nowadays, uncoated carbide tools are generally used for turning TiAl6V4. However, triboactive physical vapour deposition (PVD) coatings such as CrAlN+X (X = V, Mo) represent a promising approach to increase cutting performance. For this purpose, the ability of the coating to form lubricating oxide phases is crucial. Self-lubricating oxide phases are formed under tribological stress, e.g. during machining processes, through the oxidation of certain transition metals such as V or M. These oxide phases contribute to a reduction in thermal and mechanical stresses in the contact between the cutting edge and the workpiece. In this context, the coating systems CrAlVN and CrAlMoN were investigated with regard to their potential for the formation of self-lubricating oxide phases. This was done on the one hand in model tests using a pin-on-disc tribometer and on the other hand in the turning of TiAl6V4. The formation of self-lubricating oxide phases was demonstrated for both coating systems. In the case of CrAlMoN, however, this formation already occurred at lower contact temperatures, which is advantageous for the machining of TiAl6V4. Based on a CrAlMoN process, the effect of a process adjustment to increase the proportion of High Power Pulsed Magnetronsputtering on the application behaviour in the machining of TiAl6V4 was also investigated. Potentials for increasing the wear resistance of the CrAlMoN coatings were identified, which could contribute to an increase in performance in the machining of TiAl6V4 in the future. LB - PUB:(DE-HGF)11 ; PUB:(DE-HGF)3 DO - DOI:10.18154/RWTH-2025-02745 UR - https://publications.rwth-aachen.de/record/1006821 ER -