<div class="csl-bib-body">
<div class="csl-entry">Pölzlberger, D. E., Hahn, R., Wojcik, T., Salvadores Farran, N., Ntemou, E., Primetzhofer, D., Gachot, C., & Riedl-Tragenreif, H. (2025, May 26). <i>Unravelling solid self-lubrication mechanisms of B₂O₃ in TiB₂±z based thin films</i> [Conference Presentation]. EMRS Spring Meeting 2025, Straßburg, France. http://hdl.handle.net/20.500.12708/216985</div>
</div>
-
dc.identifier.uri
http://hdl.handle.net/20.500.12708/216985
-
dc.description.abstract
Transition metal borides (TMBs) represent a highly promising family of materials for functional coatings due to their abundance, cost-effectiveness, and exceptional mechanical properties. These include a high melting point, hardness of up to 60 GPa, excellent chemical and thermal conductivity, and outstanding resistance to wear. TMBs exhibit unique self-lubricating properties by forming boron oxide layers, reducing friction. The prevalent temperature strongly influences the formation of boron oxide. However, the fundamental mechanisms of this tribo-reaction are still not fully understood, particularly for TMB-based thin film materials. Therefore, a detailed knowledge of the oxidation behavior of physical vapor deposited TiB2 thin films is crucial for understanding their friction and wear properties. Tribological tests reveal that sputter deposited super-stoichiometric TiB3.5 exhibits a significantly lower friction coefficient (~0.25), roughly half compared to that of sub-stoichiometric TiB1.67, tested at 500°C. This reduction is attributed to the higher oxidation rate of super-stoichiometric TiB3.5 and the presence of B-rich tissue phases at the column boundaries. Furthermore, we conduct an in-situ investigation of the oxidation process in sub- and super-stoichiometric TiB2±z thin films using time-of-flight elastic recoil detection analysis (ToF-ERDA). This technique provides detailed depth profiles of the chemical composition over a temperature range from room temperature to 600°C. The oxidation data are further correlated with tribological, XRD, and TEM analyses, offering novel insights into the lubrication mechanisms of boron oxide in TMB thin films across a wide temperature range.
en
dc.language.iso
en
-
dc.subject
Self-lubrication
en
dc.subject
Transition metal borides
en
dc.subject
Boron oxide
en
dc.subject
PVD
en
dc.subject
Solid lubricants
en
dc.title
Unravelling solid self-lubrication mechanisms of B₂O₃ in TiB₂±z based thin films
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
Uppsala University, Sweden
-
dc.contributor.affiliation
Uppsala University, Sweden
-
dc.rights.holder
Daniel Pölzlberger
-
dc.type.category
Conference Presentation
-
tuw.researchinfrastructure
Analytical Instrumentation Center
-
tuw.researchinfrastructure
Röntgenzentrum
-
tuw.researchinfrastructure
Universitäre Service-Einrichtung für Transmissionselektronenmikroskopie
