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<div class="csl-entry">Kretschmer, A., Rojacz, H., Badisch, E., Polcik, P., & Mayrhofer, P. H. (2022). <i>Comparison of high-temperature tribological properties in different high-entropy sublattice ceramics</i> [Poster Presentation]. 20th Plansee Seminar, Reutte, Austria. http://hdl.handle.net/20.500.12708/153637</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/153637
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dc.description.abstract
High-entropy sublattice ceramics are promising candidates for application as wear resistant thin films. Therefore, the tribological performance of three different sputtered high-entropy sublattice ceramic coatings, (Al,Cr,Nb,Ta,Ti)O2, (Al,Cr,Nb,Ta,Ti)N, and (Hf,Ta,V,W,Zr)B2, with excellent thermal stability up to 1200 °C and as-deposited hardness values of 24, 32, and 45 GPa, respectively, was analyzed and compared against TiN in dry pin-on-disk tests at room temperature (RT), 400 °C, and 700 °C, and in high temperature (HT) scratch tests. In the dry pin-on-disk tests all coatings show similar coefficients of friction (CoF) around 0.8-1.0 at RT. The oxide coating exhibits a CoF below 0.2 at 400 °C, but suffers quick delamination at 700 °C. The CoF of (Al,Cr,Nb,Ta,Ti)N and TiN at 700 °C decreases to ~0.4 after a run-in phase, while the boride shows the opposite behavior, peaking at ~1.3. The stability in the wear tests strongly relies on the mechanical behavior of the coatings at different temperatures and can be correlated with the critical loads obtained in the HT scratch tests.
en
dc.language.iso
en
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dc.subject
PVD
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dc.subject
Tribology
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dc.subject
High-entropy
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dc.title
Comparison of high-temperature tribological properties in different high-entropy sublattice ceramics
