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Erscheinungsjahr
- 2016 (3) (entfernen)
Dokumenttyp
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- Englisch (3)
Schlagworte
- Hard materials (2)
- NbC (2)
- Niobium carbide (2)
- Friction (1)
- Hardness (1)
- High temperatures (1)
- Liquid phase sintering (LPS) (1)
- Modulus (1)
- Nb12O29 (1)
- Nb2O5 (1)
The origin of the intrinsic wear resistance of NbC-based materials is investigated through an assessment of the tribological performance of fully dense, crack-free spark plasma sintered Nb2O5 (here as a reduced polymorph: monoclinic Nb12O29 or NbO2.416). The most likely wear mechanism on NbC is the tribo-oxidation to Nb2O5. The unlubricated (dry) friction and wear behavior of alumina (99.7%) mated against rotating disks of crack-free niobium(V)oxide (Nb2O5) under unidirectional sliding (0.03–10m/s; 22°C and 400°C) and oscillation (f=20 Hz, dx=200 mm, 2/50/98% rel. humidity, n=105/106 cycles) will be presented. The microstructure and mechanical properties of the crack-free Nb2O5 are assessed. The tribological data obtained are benchmarked with different NbC grades, ceramics, cermets and thermally sprayed coatings.