ISSN -
2nd International Brazilian Conference on Tribology — vol. 2, num.2 (2014)
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Abstract
The tribological and mechanical properties of binderless and metal-bonded niobium carbides (8 or 12 vol.-% of Cobalt, 12 vol.-% of Fe3Al) are presented. Rotating disks made of niobium carbide bearing hard metals were mated against alumina (99.7%) under unlubricated (dry) unidirectional sliding tests (0,1 m/s to 12,0 m/s; 22°C and 400°C) as well as in oscillation tests (f= 20 Hz, ?x= 0,2 mm, 2/50/98% rel. humidity, n= 105/106 cycles). Microstructure and phase compositions were determined as well. The tribological data obtained were benchmarked with different ceramics, cermets, hard metals and thermally sprayed coatings, where NbC bonded with 8% and 12% Co presented above 8 m/s the lowest wear rates so far in such a benchmark. Binderless NbC (HP-NbC1) and the metal bonded NbCs exhibited low wear rates under dry sliding associated with high P?V load carrying capacities. NbC-based hard metal bonded with 12 vol.-% of Fe3Al resulted in a higher hardness level than for 12 vol.-% cobalt. The tribological profile established revealed a strong position of NbC bearing materials under tribological considerations and for closed tribosystems against established reference tribo-couples.
Keywords
Sliding; Friction; Wear; Ceramic; Oscillation; NbC; Niobium carbide; Cobalt; Fe3Al; Hard metal; Strength; Modulus; High temperatures
How to refer
Mathias Woydt;
Hardy Mohrbacher.
NIOBIUM CARBIDE (NbC) AS WEAR RESISTANT HARDMETAL IN OPENED AND CLOSED TRIBOSYSTEMS
,
p. 3842-3851.
In: 2nd International Brazilian Conference on Tribology,
Foz do Iguaçu - Brasil,
2014.
ISSN: -
, DOI 10.5151/1472-5836-25484