In-situ-beschichtete Schneidkeramik Processing und Charakterisierung (English shop)

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This dissertation investigates the development, processing, and characterization of in-situ-coated cutting ceramics based on alumina–titanium oxycarbide (Al₂O₃–Ti(C,O)). The research focuses on the controlled formation of thin titanium carbide (TiC) surface layers through thermochemical reactions and their influence on the mechanical properties and wear behavior of ceramic cutting tools. Coating formation is analyzed as a function of temperature, furnace atmosphere, carbon monoxide partial pressure, and treatment duration. Machining experiments, scratch tests, oxidation studies, and nanoindentation are employed to characterize the functional properties of the coated ceramics. The results demonstrate an improvement in wear resistance of up to 40% compared with uncoated materials. Enhanced plastic deformability of the TiC surface layer is identified as a key mechanism responsible for reducing abrasive wear. The study contributes to the understanding of surface modification in advanced ceramics and the development of more durable cutting tools.