The use of niobium carbide (Nbc) for wear resistant tribosystems and the tribological backgrounds as cutting tools
- The tribological profile of rotating disks made in binder-less niobium Carbide (hot-pressed NbC) and cobalt-bonded NbCs (NbC-8Co and NbC-12Co) mated against alumina (99.7%) were determined under unidirectional sliding tests (0.1 m/s to 8.0 m/s; 22°C and 400°C) as well as in oscillation tests (f= 20 Hz, Ax= 0.2 mm, 2/50/98% rel. humidity, n= 105/l 06 cycles) under unlubricated (dry) conditions. In addition, the microstructure and mechanical properties of HPNbCl and NbC bonded with 8 vol.-% and 12 vol.-% cobalt were determined as well. The tribological data obtained were benchmarked with different ceramics, cermets, hard metals and thermally sprayed coatings, where the NbCs bonded with 8% and 12% Co presented above 7 m/s the lowest wear rates so far in such a bench mark. HP-NbCl, NbC-8Co and NbC-12Co exhibited low wear rates under dry sliding associated with PV high load carrying capacities. The tribological profile established revealed a strong position of NbC bearing materials underThe tribological profile of rotating disks made in binder-less niobium Carbide (hot-pressed NbC) and cobalt-bonded NbCs (NbC-8Co and NbC-12Co) mated against alumina (99.7%) were determined under unidirectional sliding tests (0.1 m/s to 8.0 m/s; 22°C and 400°C) as well as in oscillation tests (f= 20 Hz, Ax= 0.2 mm, 2/50/98% rel. humidity, n= 105/l 06 cycles) under unlubricated (dry) conditions. In addition, the microstructure and mechanical properties of HPNbCl and NbC bonded with 8 vol.-% and 12 vol.-% cobalt were determined as well. The tribological data obtained were benchmarked with different ceramics, cermets, hard metals and thermally sprayed coatings, where the NbCs bonded with 8% and 12% Co presented above 7 m/s the lowest wear rates so far in such a bench mark. HP-NbCl, NbC-8Co and NbC-12Co exhibited low wear rates under dry sliding associated with PV high load carrying capacities. The tribological profile established revealed a strong position of NbC bearing materials under tribological considerations and for closed tribo-systems against traditional references.…


| Autor*innen: | Mathias WoydtORCiD, H. Mohrbacher |
|---|---|
| Dokumenttyp: | Beitrag zu einem Tagungsband |
| Veröffentlichungsform: | Verlagsliteratur |
| Sprache: | Englisch |
| Titel des übergeordneten Werkes (Englisch): | 9th International conference on tungsten, refractory & hardmaterials (Proceedings) |
| Jahr der Erstveröffentlichung: | 2014 |
| Herausgeber (Institution): | Metal powder industries federation |
| Erste Seite: | 222 |
| Letzte Seite: | 232 |
| Freie Schlagwörter: | Ceramic; Cobalt; Friction; Hard metal; High temperatures; Modulus; NbC; Niobium carbide; Oscillation; Sliding; Strength; Wear |
| Veranstaltung: | 9th International conference on tungsten, refractory & hardmaterials |
| Veranstaltungsort: | Orlando, FL, USA |
| Beginndatum der Veranstaltung: | 18.05.2014 |
| Enddatum der Veranstaltung: | 22.05.2014 |
| ISBN: | 978-0-9853397-7-7 |
| Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
| Datum der Freischaltung: | 20.02.2016 |
| Referierte Publikation: | Ja |
| Datum der Eintragung als referierte Publikation: | 16.10.2014 |

