Wolfgang Tillmann

Influence of the Spray Angle, Standoff Distance, and Traverse Speed of the Spray Gun on the Tribomechanical Properties of Cold-Sprayed Inconel 718 Coatings

Ingor Baumann, Mukul Aravind Kada, Jonas Zajaczkowski, Lukas Wojarski et autres

Abstract Superalloys such as Inconel 718 are the preferred materials for highly stressed components in turbine jets as they offer a combination of high strength and excellent resistance to oxidation and corrosion. Despite their exceptional properties, these materials are subject to intense …

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PVD duplex treatment of AISI M2 high-speed steel additively manufactured by metal binder jetting

Nelson Filipe Lopes Dias, Julia Urbanczyk, Tim Schäfer, Dominic Stangier et autres

Among additive manufacturing techniques, metal binder jetting (MBJ) offers high build rates and cost-efficient manufacturing, making it attractive for large-scale production of tooling components. However, MBJ produced AISI M2 high-speed steel exhibits a distinct microstructure compared with conventionally manufactured material, and its …

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Automated image segmentation of worn PVD-coated cutting edges using multimodal convolutional neural network-based approaches

Finn Rümenapf, Nelson Filipe Lopes Dias, Nils Denkmann, Timo Platt et autres

Automated wear analysis of coated milling cutters based on multimodal microscopy data combining scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) remains challenging due to non-linear correlations between structural and compositional features. In this study, four distinct deep learning and clustering …

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Residual stress measurement of physical vapor deposition (PVD) AlTiN thin films - a comparative study of x-Ray diffraction-, Raman spectroscopic and ring core method

Hilke Petersen, Arnd Heckemeyer, Bernd Breidenstein, Christoph Kahra et autres

Abstract Cutting inserts experience substantial mechanical and thermal loads during machining. Hard thin-film coatings are widely applied to enhance performance and durability, but their residual stresses critically affect adhesion, stability, and tool life. Common stress determination methods include X-ray diffraction (sin²ψ; V …

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Grey-box model–integrating tribology descriptor for tool wear prediction in milling

Amirmohammad Jamali, Amod Kashyap, Finn Rümenapf, Nelson Filipe Lopes Dias et autres

Optimization of Cr3C2-NiCr Coatings using ID-HVOF: A Statistical Approach to Key Process Parameters

Mark Dennis Kensy, I. Baumann, Jonas Frederik Zajaczkowski, Leif Hagen et autres

Abstract Cr 3 C 2 -NiCr coatings are widely used to protect industrial components in harsh environments due to their exceptional wear resistance, high-temperature oxidation protection, and corrosion resistance. Such coatings are typically produced using the high-velocity oxygen fuel (HVOF) spraying process. …

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Insight into the Process–Microstructure–Property Relationship: Single-Splat Analysis, Adhesion Testing, and Thermal Cycling of Inner-Diameter Thermal Barrier Coatings

Maheshwar Rao Bagathi, Jonas Frederik Zajaczkowski, Wolfgang Tillmann, Daniel Emil Mack et autres

Abstract Although inner-diameter (ID) thermal barrier coating (TBC) processes are well established for large aero/land-based turbine liners, the relationships between the processes, microstructures, and properties of coatings applied to smaller, highly confined passages (ID < 200 mm), such as combustor liners, exhaust …

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Grey-box model–integrating tribology descriptor for tool wear prediction in milling

Amirmohammad Jamali, Amod Kashyap, Finn Rümenapf, Nelson Filipe Lopes Dias et autres

Tool wear prediction in milling often relies on extensive experiments or data-driven models, limiting efficiency and interpretability. This study introduces a process–tribology descriptor linking a coating-specific tribological wear parameter from model tests to time-dependent tool wear. A coating-specific wear rate is embedded …

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Residual stress measurement of physical vapor deposition (PVD) AlTiN thin films - a comparative study of x-Ray diffraction-, Raman spectroscopic and ring core method

Hilke Petersen, Arnd Heckemeyer, Bernd Breidenstein, Christoph Kahra et autres

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Analogy Dressing Investigation for the Evaluation of the Behavior of Cold Gas Sprayed cBN-Copper Coatings for Future Grinding Applications

Juan Sebastian Palomeque Vargas, Monika Kipp, Jonas Frederik Zajaczkowski, Ingor Baumann et autres

High-pressure cold gas spraying allows the deposition of abrasive coatings at comparatively low temperatures, in contrast to thermal processes such as plasma spraying or high velocity oxy-fuel spraying. Using this technology focuses on the objective of manufacturing abrasive coatings for flexible, task-specific …

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Insight into the Process–Microstructure–Property Relationship: Single-Splat Analysis, Adhesion Testing, and Thermal Cycling of Inner-Diameter Thermal Barrier Coatings

Maheshwar Rao Bagathi, Jonas Frederik Zajaczkowski, Wolfgang Tillmann, Daniel Emil Mack et autres

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Influence of the engagement condition on surface integrity in micromilling of cemented carbide

Christoph Paul Jäckel, Nils Schmidt, Timo Platt, Nelson Filipe Lopes Dias et autres