Femtosekundenlaserbearbeitung tetragonalen Zirconiumdioxids zur Mikrostrukturierung und Erzeugung von Nanopartikeln (English shop)

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Owing to its biocompatibility and mechanical properties, tetragonal zirconium dioxide is used for implants that are exposed to high loads. All conventional machining processes, however, including those using lasers down to the nanosecond range, entail losses in the quality of the final product.

Femtosecond lasers, by contrast, enable precise material removal with little damage. The productivity of the process is investigated in three fields of application: the microstructuring of surfaces, the cutting out of material blocks, and the generation of nanoparticles in liquids. Optimal process conditions and machining parameters are determined for each of these fields. Among other things, the generation of stable zirconium dioxide nanoparticles by femtosecond laser ablation in liquids is demonstrated and investigated for the first time.

The main application focus of the processes investigated is the microstructuring of the inner surface of dental crowns: laser-generated grooves are shown to improve the adhesive bond between test specimens and a dental luting cement.