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6 Materialschutz und Oberflächentechnik

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Autor

  • Woydt, Mathias (3)
  • Ehrke, Roman (2)
  • Mohrbacher, H. (2)
  • Wäsche, Rolf (2)
  • Hartelt, Manfred (1)

Erscheinungsjahr

  • 2017 (1)
  • 2015 (1)
  • 2014 (2)

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  • Beitrag zu einem Tagungsband (4) (entfernen)

Referierte Publikation

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  • Wear (4) (entfernen)

Organisationseinheit der BAM

  • 6 Materialschutz und Oberflächentechnik (4)
  • 6.3 Makro-Tribologie und Verschleißschutz (4)

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Wear of alpha-alumina in hot steam up to 300°C (2017)
Wäsche, Rolf ; Ehrke, Roman ; Woydt, Mathias
Selfmated alpha-alumina sliding couples have been investigated under oscillating sliding at 100 N load in different humidity conditions in air as in hot steam up to temperatures of 300°C and ambient pressures up to 4 bar.
A study on tribological behaviour of a-C:H coatings under lubricated conditions up to 250 °C (2015)
Wäsche, Rolf ; Hartelt, Manfred ; Ehrke, Roman
The influence of temperature and counterbody material on the tribological properties of a-C:H coatings deposited on Cronidur 30 steel has been investigated in a lubricated ball on disk contact situation. The results show, that the wear volumes of the system increase exponentially with increasing temperature. Two different wear mechanisms seem to have a major influence: First, the abrasive action due to materials hardness and second, the tribooxidation when silicon nitride is counter material.
Tribological background for the use of niobium carbide (NBC) as cutting tools and for wear resistant tribosystems (2014)
Woydt, Mathias ; Mohrbacher, H.
The tribological profile of rotating disks made of binder-less niobium carbide (hot-pressed NbC) and cobalt-bonded NbC (NbC-8Co) 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, Δx= 0.2 mm, 2/50/98% rel. humidity, n= 105/106 cycles) under un-lubricated (dry) conditions. In addition, the microstructure and mechanical properties of NbC and NbC bonded with 8% cobalt were determined as well. The tribological data obtained were benchmarked with different ceramics, cermets, hard metals and thermally sprayed coatings, where the NbC-8Co presented above 7 m/s the lowest wear rates so far in such a bench mark. NbC and NbC-8Co exhibited low wear rates under dry sliding associated with P·V high load carrying capacity. The tribological profile established revealed a strong position of NbC bearing materials under tribological considerations and for closed tribo-systems against traditional references.
The use of niobium carbide (Nbc) for wear resistant tribosystems and the tribological backgrounds as cutting tools (2014)
Woydt, Mathias ; Mohrbacher, H.
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 under tribological considerations and for closed tribo-systems against traditional references.
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