Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Poster Wednesday: Organic Molecules on Inorganic Surfaces

O 69.12: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

Interfacial reactivity and adhesive properties of ternary transition metal nitride hard coatings in contact with polymers — •Martin Wiesing — Universität Paderborn, Paderborn, Germany

The surface oxidation behaviour of the prototypical nitric hard coating Ti0.5Al0.5N and its adhesive interactions with polycarbonate were investigated and related to its surface chemical and defect structure. The joint ion and electron spectroscopic analysis of the thermal and electrochemical surface oxidation allowed to develop a microscopic model of oxidation spanning the range from the early stages of oxidation to the formation of thick oxidation layers. The results corroborate the high significance of the surface electronic and defect structure for the reactivity of the metal-like and oxidic surfaces of Ti0.5Al0.5N.

UHV based Dynamic Force Spectroscopy (DFS) was performed to reveal the nature of the force interactions between Ti0.5Al0.5N and polycarbonate and their intimate relation to the surface oxide structure.

A novel experimental approach for the analysis of van der Waals forces based on Lifshitz theory combined with Reflection Electron Energy Loss Spectroscopy (REELS) was introduced to complement the force analysis. The method allows for the first time to determine highly accurate Hamaker coefficients of thin surface layers (>1 nm).

The here presented results are highly significant for understanding the corrosion and oxidation behaviour of hard coatings and to control their adhesive behaviour in contact with polymers.