PhD defense by Inge L. Rasmussen – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2011 > PhD defense by Inge L....

PhD defense by Inge L. Rasmussen

 

This work is a study on thin films and coatings, some of which are of hard ceramic materials such as titanium nitride (TiN), titanium aluminum nitride (TiAlN) and chromium nitride (CrN) and some of which are of optical materials such as titanium dioxide (TiO2). The films and coatings have been studied extensively in various ways ranging all the way from initial film nucleation and growth mode studies over both individual and combined wear and optical characterizations to real-time dynamical wear process experiments and possible chemical phase change detections.

Films and coatings of TiO2, TiN and TiAlN were studied by combined tribo-optical means to verify a proposed optical wear monitor system consisting of hard protective coatings with embedded nano-layers of optical signal materials. Changes in the optical reflections from a simple laser pointer (633 nm) are observed when the wear process reaches the embedded signal layer in the optical monitor (much like eating a layer cake from above - once you reach the layer of strawberry jam, you know that you are half way through the cake). Moreover, the dynamical wear process of hard TiAlN and CrN multi-layer coatings with an embedded CrN wear-marker layer is studied in real-time X-ray absorption spectroscopy and transmission experiments by means of specific synchrotron radiation.

PhD defense by Inge L. Rasmussen